Add tests

Change FullDataSourceDTO checksum/hash logic to hopefully be more consistent
Fix default generic rendering instanced mode
2024-09-26 17:39:05 +05:00 · 2024-09-25 21:57:49 -05:00 · 2024-09-25 18:44:39 -05:00 · 2024-09-22 17:25:14 -05:00 · 2024-09-22 17:23:35 -05:00 · 2024-09-22 17:18:33 -05:00
180 changed files with 7140 additions and 3297 deletions
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+Distant Horizons logos © 2024 by Pankakes are licensed under CC BY-SA 4.0 
@@ -1,7 +1,7 @@
-# Distant Horizons
+# <img src="https://gitlab.com/jeseibel/distant-horizons-core/-/raw/main/_Misc%20Files%2Flogo%20files%2Fnew%2FSVG%2FDistant-Horizons-Core.svg" height="128px">

 This repo is for the Distant Horizons mod.
-The purpose of this submodule is to isolate code that isn't tied to a specific version of minecraft. This prevents us from having duplicate code; reducing errors and potentially helping us port to different versions faster and easier.
+The purpose of this submodule is to isolate code that isn't tied to a specific version of minecraft. This prevents us from having duplicate code; reducing errors and helping us port to different versions faster and easier.

 Check out the mod's main GitLab page here:
 https://gitlab.com/jeseibel/distant-horizons
@@ -0,0 +1,44 @@
+# Distant Horizons brand guidelines
+
+To keep our look consistent and recognizable, we’ve created some simple guidelines for using our logos. We have a Primary logo, Core and API logos. Keep them cool 😎
+
+
+## Logos
+Please do not edit, change, distort, recolour, or reconfigure our logos.
+| ![Distant Horizons primary logo](./PNG/Distant-Horizons.png) | ![Distant Horizons Core logo](./PNG/Distant-Horizons-Core.png) | ![Distant Horizons API logo](./PNG/Distant-Horizons-API.png) |
+|--|--|--|
+|Primary &nbsp; &nbsp; &nbsp; &nbsp; [.png](/PNG/Distant-Horizons.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-Logo.svg)| Core &nbsp; &nbsp; &nbsp; &nbsp; [.png](/PNG/Distant-Horizons-Core.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-Core.svg) | API &nbsp; &nbsp; &nbsp; &nbsp;  [.png](./PNG/Distant-Horizons-API.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-API.svg) |
+
+
+## Marks
+Use these only when the Distant Horizons brand is clearly visible or has been well established elsewhere on the page or in the design. (When in doubt, use the other ones.)
+
+> *Keep in mind the Distant Horizons API mark needs to be optically centered to align.*
+
+<!-- | ![Distant Horizons primary mark](./PNG/Distant-Horizons-Mark.png) | ![Distant Horizons Core mark](./PNG/Distant-Horizons-Core-Mark.png) | ![Distant Horizons API mark](./PNG/Distant-Horizons-API-Mark.png) |
+|--|--|--|
+|Primary &nbsp; &nbsp; &nbsp; &nbsp; [.png](/PNG/Distant-Horizons-Mark.png.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-Mark.svg.svg)| Core &nbsp; &nbsp; &nbsp; &nbsp; [.png](/PNG/Distant-Horizons-Core-Mark.png.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-Core-Mark.svg.svg) | API &nbsp; &nbsp; &nbsp; &nbsp;  [.png](./PNG/Distant-Horizons-API-Mark.png.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-API-Mark.svg.svg) | -->
+
+| <img src="./PNG/Distant-Horizons-Mark.png" width="100"/> | <img src="./PNG/Distant-Horizons-Core-Mark.png" width="100"/> | <img src="./PNG/Distant-Horizons-API-Mark.png" width="100"/> |
+|--|--|--|
+|Primary &nbsp; &nbsp; &nbsp; &nbsp; [.png](/PNG/Distant-Horizons-Mark.png.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-Mark.svg.svg)| Core &nbsp; &nbsp; &nbsp; &nbsp; [.png](/PNG/Distant-Horizons-Core-Mark.png.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-Core-Mark.svg.svg) | API &nbsp; &nbsp; &nbsp; &nbsp;  [.png](./PNG/Distant-Horizons-API-Mark.png.png) &nbsp; &nbsp; &nbsp; &nbsp;  [.svg](./SVG/Distant-Horizons-API-Mark.svg.svg) |
+
+
+
+## Spacing
+Every logo needs room to breathe. 
+Ours needs the free space of the height and width of the letter **"H"** in Distant **H**orizons.
+
+> *Some leeway is allowed for the Distant Horizons API mark due to it's shape.*
+
+| ![Distant Horizons logo spacing](./Guidelines_images//Distant-Horizons-Logo-Spacing2.png) | ![Distant Horizons mark spacing](./Guidelines_images//Distant-Horizons-Mark-Spacing2.png) |  
+|--|--|
+
+
+___
+
+The logotype we are using in our logos is a modified [Karmatic Arcade font by Vic Fieger](https://www.dafont.com/karmatic-arcade.font?fpp=100&psize=s)
+
+This branding guideline was influenced by [Discord's own](https://discord.com/branding)
+
+Distant Horizons logos © 2024 by Pankakes are licensed under CC BY-SA 4.0 
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@@ -28,8 +28,6 @@ import com.seibel.distanthorizons.api.interfaces.IDhApiUnsafeWrapper;
 */
 public interface IDhApiDimensionTypeWrapper extends IDhApiUnsafeWrapper
 {
-	String getDimensionName();
-	
 	boolean hasCeiling();
 	
 	boolean hasSkyLight();
@@ -35,6 +35,9 @@ public interface IDhApiLevelWrapper extends IDhApiUnsafeWrapper
 {
 	IDhApiDimensionTypeWrapper getDimensionType();
 	
+	/** @since API 4.0.0 */
+	String getDimensionName();
+
 	EDhApiLevelType getLevelType();
 	
 	boolean hasCeiling();
@@ -26,27 +26,28 @@ package com.seibel.distanthorizons.coreapi;
 public final class ModInfo
 {
 	public static final String ID = "distanthorizons";
-	/** The internal protocol version used for networking */
-	public static final int PROTOCOL_VERSION = 1;
-	/** The protocol version used for multiverse networking */
-	public static final int MULTIVERSE_PLUGIN_PROTOCOL_VERSION = 1;
+	
+	public static final String RESOURCE_NAMESPACE = "distant_horizons";
+	public static final String DEDICATED_SERVER_INITIAL_PATH = "dedicated_server_initial";
+	
+	/** Incremented every time any packets are added, changed or removed, with a few exceptions. */
+	public static final int PROTOCOL_VERSION = 4;
+	public static final String WRAPPER_PACKET_PATH = "message";
+	
 	/** The internal mod name */
 	public static final String NAME = "DistantHorizons";
 	/** Human-readable version of NAME */
 	public static final String READABLE_NAME = "Distant Horizons";
-	public static final String VERSION = "2.2.1-a";
+	public static final String VERSION = "2.3.0-a-dev";
 	/** Returns true if the current build is an unstable developer build, false otherwise. */
 	public static boolean IS_DEV_BUILD = VERSION.toLowerCase().contains("dev");
 	
 	/** This version should only be updated when breaking changes are introduced to the DH API */
-	public static final int API_MAJOR_VERSION = 3;
+	public static final int API_MAJOR_VERSION = 4;
 	/** This version should be updated whenever new methods are added to the DH API */
 	public static final int API_MINOR_VERSION = 0;
 	/** This version should be updated whenever non-breaking fixes are added to the DH API */
-	public static final int API_PATCH_VERSION = 1;
-	
-	public static final String NETWORKING_RESOURCE_NAMESPACE = "distant_horizons";
-	public static final String MULTIVERSE_PLUGIN_NAMESPACE = "world_control";
+	public static final int API_PATCH_VERSION = 0;
 	
 	/** All DH owned threads should start with this string to allow for easier debugging and profiling. */
 	public static final String THREAD_NAME_PREFIX = "DH-";
@@ -23,6 +23,7 @@ import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericRenderObjectFactory;
 import com.seibel.distanthorizons.core.sql.DatabaseUpdater;
 import com.seibel.distanthorizons.core.wrapperInterfaces.IWrapperFactory;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.coreapi.ModInfo;
 import com.seibel.distanthorizons.core.world.DhApiWorldProxy;
 import com.seibel.distanthorizons.core.api.external.methods.config.DhApiConfig;
@@ -32,14 +33,19 @@ import com.seibel.distanthorizons.core.render.DhApiRenderProxy;
 import net.jpountz.lz4.LZ4FrameOutputStream;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.sqlite.SQLiteJDBCLoader;
+import org.sqlite.util.OSInfo;
 import org.tukaani.xz.XZOutputStream;

 import java.awt.*;
+import java.io.File;

 /** Handles first time Core setup. */
 public class Initializer
 {
 	private static final Logger LOGGER = LogManager.getLogger(ModInfo.NAME + "-" + Initializer.class.getSimpleName());
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	
 	
 	public static void init()
 	{
@@ -54,12 +60,44 @@ public class Initializer
 			Class<?> config = com.electronwill.nightconfig.core.Config.class;
 			Class<?> oldFastUtil = it.unimi.dsi.fastutil.longs.LongArrayList.class; // available in 8.2.1
 			//Class<?> newFastUtil = it.unimi.dsi.fastutil.ints.IntUnaryOperator.class; // available in 8.5.13
+			Class<?> sqliteJava = org.sqlite.SQLiteConnection.class;
+			Class<?> sqliteNative = org.sqlite.core.NativeDB.class;
+			
+			//// maybe these lines are needed to shade SQLite, James isn't sure.
+			//// Although they never seemed to fail, which is a bit odd.
+			//try
+			//{
+			//	// needed by Forge to load the Java database connection
+			//	Class.forName("org.sqlite.JDBC");
+			//	LOGGER.info("loaded normal SQLITE");
+			//}
+			//catch (ClassNotFoundException e)
+			//{
+			//	LOGGER.warn("normal: " + e.getMessage(), e);
+			//}
+			//
+			//try
+			//{
+			//	// needed by Forge to load the Java database connection
+			//	Class.forName("DistantHorizons.libraries.sqlite.JDBC");
+			//	LOGGER.info("loaded shaded SQLITE");
+			//}
+			//catch (ClassNotFoundException e)
+			//{
+			//	LOGGER.warn("shaded: " + e.getMessage(), e);
+			//}
+			
+			boolean sqliteLoaded = SQLiteJDBCLoader.initialize();
+			if (!sqliteLoaded)
+			{
+				throw new RuntimeException("Failed to load SQLite native library. Hopefully SQLite logged a reason for this failure.");
+			}
 		}
 		catch (Throwable e)
 		{
-			LOGGER.fatal("Critical programmer error: One or more libraries aren't present. Error: [" + e.getMessage() + "].");
+			LOGGER.fatal("Critical programmer error: One or more libraries aren't present. Error: [" + e.getMessage() + "].", e);
 			// throwing here should crash the game, notifying the developer that something is wrong
-			throw e;
+			throw new RuntimeException(e);
 		}
 		
 		// confirm the resource directory is present
@@ -77,7 +115,8 @@ public class Initializer
 			throw new RuntimeException(e);
 		}
 		
-		
+		if (MC_CLIENT != null)
+		{
 			// attempt to set up Swing so we can display dialogs (popup windows)
 			System.setProperty("java.awt.headless", "false");
 			if (GraphicsEnvironment.isHeadless())
@@ -88,6 +127,7 @@ public class Initializer
 			{
 				LOGGER.info("Java.awt.headless set to true. Distant Horizons can correctly display error and info dialog windows.");
 			}
+		}
 		
 		// link Core's config to the API
 		DhApi.Delayed.configs = DhApiConfig.INSTANCE;
@@ -24,18 +24,20 @@ import com.seibel.distanthorizons.api.enums.rendering.EDhApiRenderPass;
 import com.seibel.distanthorizons.api.methods.events.abstractEvents.*;
 import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiRenderParam;
 import com.seibel.distanthorizons.core.file.structure.ClientOnlySaveStructure;
-import com.seibel.distanthorizons.core.level.IKeyedClientLevelManager;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.render.DhApiRenderProxy;
+import com.seibel.distanthorizons.core.util.TimerUtil;
 import com.seibel.distanthorizons.core.util.objects.Pair;
-import com.seibel.distanthorizons.core.world.*;
 import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import com.seibel.distanthorizons.core.level.IDhClientLevel;
 import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
 import com.seibel.distanthorizons.coreapi.ModInfo;
 import com.seibel.distanthorizons.api.enums.rendering.EDhApiDebugRendering;
 import com.seibel.distanthorizons.api.enums.rendering.EDhApiRendererMode;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
+import com.seibel.distanthorizons.core.level.IServerKeyedClientLevel;
 import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
 import com.seibel.distanthorizons.core.logging.ConfigBasedSpamLogger;
 import com.seibel.distanthorizons.core.logging.SpamReducedLogger;
@@ -43,21 +45,21 @@ import com.seibel.distanthorizons.core.util.math.Mat4f;
 import com.seibel.distanthorizons.core.render.glObject.GLProxy;
 import com.seibel.distanthorizons.core.render.renderer.TestRenderer;
 import com.seibel.distanthorizons.core.util.RenderUtil;
+import com.seibel.distanthorizons.core.world.AbstractDhWorld;
+import com.seibel.distanthorizons.core.world.DhClientServerWorld;
+import com.seibel.distanthorizons.core.world.DhClientWorld;
+import com.seibel.distanthorizons.core.world.IDhClientWorld;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
-import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftRenderWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IProfilerWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
-//import io.netty.buffer.ByteBuf;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
-import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.NotNull;
 import org.lwjgl.glfw.GLFW;

 import java.io.File;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Queue;
+import java.util.*;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.TimeUnit;

@@ -75,9 +77,7 @@ public class ClientApi
 	public static final ClientApi INSTANCE = new ClientApi();
 	public static final TestRenderer TEST_RENDERER = new TestRenderer();
 	
-	private static final IMinecraftClientWrapper MC = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
-	private static final IMinecraftRenderWrapper MC_RENDER = SingletonInjector.INSTANCE.get(IMinecraftRenderWrapper.class);
-	private static final IKeyedClientLevelManager KEYED_CLIENT_LEVEL_MANAGER = SingletonInjector.INSTANCE.get(IKeyedClientLevelManager.class);
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
 	
 	public static final long SPAM_LOGGER_FLUSH_NS = TimeUnit.NANOSECONDS.convert(1, TimeUnit.SECONDS);
 	
@@ -90,10 +90,11 @@ public class ClientApi
 	
 	private long lastFlushNanoTime = 0;
 	
-	private boolean isServerCommunicationEnabled = false;
+	private final ClientPluginChannelApi pluginChannelApi = new ClientPluginChannelApi(this::clientLevelLoadEvent, this::clientLevelUnloadEvent);
 	
-	/** set to true if any unexpected responses are received from the server */
-	private boolean serverNetworkingIsMalformed = false;
+	/** Delay loading the first level to give the server some time to respond with level to actually load */
+	private Timer firstLevelLoadTimer;
+	private static final long FIRST_LEVEL_LOAD_DELAY_IN_MS = 1_000;
 	
 	/** Holds any levels that were loaded before the {@link ClientApi#onClientOnlyConnected} was fired. */
 	public final HashSet<IClientLevelWrapper> waitingClientLevels = new HashSet<>();
@@ -127,8 +128,8 @@ public class ClientApi
 	public synchronized void onClientOnlyConnected()
 	{
 		// only continue if the client is connected to a different server
-		boolean connectedToServer = MC.clientConnectedToDedicatedServer();
-		boolean connectedToReplay = MC.connectedToReplay();
+		boolean connectedToServer = MC_CLIENT.clientConnectedToDedicatedServer();
+		boolean connectedToReplay = MC_CLIENT.connectedToReplay();
 		if (connectedToServer || connectedToReplay)
 		{
 			if (connectedToServer)
@@ -141,19 +142,22 @@ public class ClientApi
 				
 				if (Config.Client.Advanced.Logging.showReplayWarningOnStartup.get())
 				{
-					MC.sendChatMessage("\u00A76" + "Distant Horizons: Replay detected." + "\u00A7r"); // gold color
-					MC.sendChatMessage("DH may behave strangely or have missing functionality.");
-					MC.sendChatMessage("In order to use pre-generated LODs, put your DH database(s) in:");
-					MC.sendChatMessage("\u00A77"+".Minecraft" + File.separator + ClientOnlySaveStructure.SERVER_DATA_FOLDER_NAME + File.separator + ClientOnlySaveStructure.REPLAY_SERVER_FOLDER_NAME + File.separator + "DIMENSION_NAME"+"\u00A7r"); // light gray color
-					MC.sendChatMessage("This can be disabled in DH's config under Advanced -> Logging.");
-					MC.sendChatMessage("");
+					MC_CLIENT.sendChatMessage("\u00A76" + "Distant Horizons: Replay detected." + "\u00A7r"); // gold color
+					MC_CLIENT.sendChatMessage("DH may behave strangely or have missing functionality.");
+					MC_CLIENT.sendChatMessage("In order to use pre-generated LODs, put your DH database(s) in:");
+					MC_CLIENT.sendChatMessage("\u00A77"+".Minecraft" + File.separator + ClientOnlySaveStructure.SERVER_DATA_FOLDER_NAME + File.separator + ClientOnlySaveStructure.REPLAY_SERVER_FOLDER_NAME + File.separator + "DIMENSION_NAME"+"\u00A7r"); // light gray color
+					MC_CLIENT.sendChatMessage("This can be disabled in DH's config under Advanced -> Logging.");
+					MC_CLIENT.sendChatMessage("");
 				}
 			}
 			
 			// firing after clientLevelLoadEvent
 			// TODO if level has prepped to load it should fire level load event
-			SharedApi.setDhWorld(new DhClientWorld());
+			DhClientWorld world = new DhClientWorld();
+			SharedApi.setDhWorld(world);
 			
+			this.pluginChannelApi.onJoinServer(world.networkState.getSession());
+			world.networkState.sendConfigMessage();
 			
 			LOGGER.info("Loading [" + this.waitingClientLevels.size() + "] waiting client level wrappers.");
 			for (IClientLevelWrapper level : this.waitingClientLevels)
@@ -168,6 +172,13 @@ public class ClientApi
 	/** Synchronized to prevent a rare issue where multiple disconnect events are triggered on top of each other. */
 	public synchronized void onClientOnlyDisconnected()
 	{
+		// clear the first time timer
+		if (this.firstLevelLoadTimer != null)
+		{
+			this.firstLevelLoadTimer.cancel();
+			this.firstLevelLoadTimer = null;
+		}
+		
 		AbstractDhWorld world = SharedApi.getAbstractDhWorld();
 		if (world != null)
 		{
@@ -177,11 +188,7 @@ public class ClientApi
 			SharedApi.setDhWorld(null);
 		}
 		
-		// clear the previous server's information
-		this.isServerCommunicationEnabled = false;
-		this.serverNetworkingIsMalformed = false;
-		KEYED_CLIENT_LEVEL_MANAGER.setUseOverrideWrapper(false);
-		KEYED_CLIENT_LEVEL_MANAGER.setServerKeyedLevel(null);
+		this.pluginChannelApi.reset();
 		
 		// remove any waiting items
 		this.waitingChunkByClientLevelAndPos.clear();
@@ -194,16 +201,16 @@ public class ClientApi
 	// level events //
 	//==============//
 	
-	public void clientLevelUnloadEvent(@Nullable IClientLevelWrapper level)
+	public void clientLevelUnloadEvent(IClientLevelWrapper level)
 	{
 		try
 		{
-			if (level == null)
+			LOGGER.info("Unloading client level [" + level + "]-["+level.getDimensionName()+"].");
+			
+			if (level instanceof IServerKeyedClientLevel)
 			{
-				// can happen on certain multiverse servers
-				return;
+				this.pluginChannelApi.onClientLevelUnload();
 			}
-			LOGGER.info("Unloading client level [" + level + "]-["+level.getDimensionType().getDimensionName()+"].");
 			
 			AbstractDhWorld world = SharedApi.getAbstractDhWorld();
 			if (world != null)
@@ -223,30 +230,42 @@ public class ClientApi
 		}
 	}
 	
-	public void clientLevelLoadEvent(@Nullable IClientLevelWrapper level) { this.clientLevelLoadEvent(level, false); }
-	public void multiverseClientLevelLoadEvent(@Nullable IClientLevelWrapper level) { this.clientLevelLoadEvent(level, true); }
-	private void clientLevelLoadEvent(@Nullable IClientLevelWrapper level, boolean isServerCommunication)
+	public void clientLevelLoadEvent(IClientLevelWrapper level)
 	{
+		// wait a moment before loading the level to give the server a chance to handle the client's login request
+		if (MC_CLIENT.clientConnectedToDedicatedServer())
+		{
+			if (this.firstLevelLoadTimer == null)
+			{
+				this.firstLevelLoadTimer = TimerUtil.CreateTimer("FirstLevelLoadTimer");
+				this.firstLevelLoadTimer.schedule(new TimerTask()
+				{
+					@Override
+					public void run() { ClientApi.this.clientLevelLoadEvent(level); }
+				}, FIRST_LEVEL_LOAD_DELAY_IN_MS);
+				return;
+			}
+			this.firstLevelLoadTimer.cancel();
+		}
+		
+		
 		try
 		{
-			if (this.isServerCommunicationEnabled && !isServerCommunication)
-			{
-				LOGGER.info("Server supports communication, deferring loading.");
-				return;
-			}
-			if (level == null)
-			{
-				// can happen on certain multiverse servers
-				return;
-			}
-			
-			
-			
-			LOGGER.info("Loading " + (isServerCommunication ? "Multiverse" : "") + " client level [" + level + "]-["+level.getDimensionType().getDimensionName()+"].");
+			LOGGER.info("Loading client level [" + level + "]-["+level.getDimensionName()+"].");
 			
 			AbstractDhWorld world = SharedApi.getAbstractDhWorld();
 			if (world != null)
 			{
+				if (!this.pluginChannelApi.allowLevelLoading(level))
+				{
+					LOGGER.info("Levels in this connection are managed by the server, skipping auto-load.");
+					
+					// Instead of attempting to load themselves, send the config and wait for a server provided level key.
+					((DhClientWorld) world).networkState.sendConfigMessage();
+					return;
+				}
+				
+				
 				world.getOrLoadLevel(level);
 				ApiEventInjector.INSTANCE.fireAllEvents(DhApiLevelLoadEvent.class, new DhApiLevelLoadEvent.EventParam(level));
 				
@@ -295,7 +314,7 @@ public class ClientApi
 	{
 		LOGGER.info("Renderer shutting down.");
 		
-		IProfilerWrapper profiler = MC.getProfiler();
+		IProfilerWrapper profiler = MC_CLIENT.getProfiler();
 		profiler.push("DH-RendererShutdown");
 		
 		profiler.pop();
@@ -305,7 +324,7 @@ public class ClientApi
 	{
 		LOGGER.info("Renderer starting up.");
 		
-		IProfilerWrapper profiler = MC.getProfiler();
+		IProfilerWrapper profiler = MC_CLIENT.getProfiler();
 		profiler.push("DH-RendererStartup");
 		
 		// make sure the GLProxy is created before the LodBufferBuilder needs it
@@ -315,7 +334,7 @@ public class ClientApi
 	
 	public void clientTickEvent()
 	{
-		IProfilerWrapper profiler = MC.getProfiler();
+		IProfilerWrapper profiler = MC_CLIENT.getProfiler();
 		profiler.push("DH-ClientTick");
 		
 		try
@@ -337,7 +356,7 @@ public class ClientApi
 				// Ignore local world gen, as it's managed by server ticking
 				if (!(clientWorld instanceof DhClientServerWorld))
 				{
-					SharedApi.worldGenTick(clientWorld::doWorldGen);
+					SharedApi.worldGenTick(clientWorld::worldGenTick);
 				}
 			}
 		}
@@ -356,123 +375,14 @@ public class ClientApi
 	// networking //
 	//============//
 	
-//	/** @param byteBuf is Netty's {@link ByteBuffer} wrapper. */
-//	public void serverMessageReceived(ByteBuf byteBuf)
-//	{
-//		if (!Config.Client.Advanced.Multiplayer.enableMultiverseNetworking.get())
-//		{
-//			// multiverse networking disabled, ignore anything sent from the server
-//			return;
-//		}
-//		
-//		
-//		
-//		// either value can be set to true to debug the received byte stream
-//		boolean stopAndDisplayInputAsByteArray = false;
-//		boolean stopAndDisplayInputAsString = false;
-//		if (stopAndDisplayInputAsByteArray || stopAndDisplayInputAsString)
-//		{
-//			String messageString = "";
-//			if (stopAndDisplayInputAsByteArray)
-//			{
-//				int byteCount = byteBuf.readableBytes();
-//				byte[] arr = new byte[byteCount];
-//				StringBuilder stringBuilder = new StringBuilder("Server message received: [");
-//				for (int i = 0; i < byteCount; i++)
-//				{
-//					arr[i] = byteBuf.readByte();
-//					stringBuilder.append(arr[i]);
-//				}
-//				stringBuilder.append("]");
-//				
-//				messageString = stringBuilder.toString();
-//			}
-//			else if (stopAndDisplayInputAsString)
-//			{
-//				messageString = byteBuf.toString(StandardCharsets.UTF_8);
-//			}
-//			
-//			// this is logged as an error so it is easier to see in an Intellij log
-//			LOGGER.error(messageString);
-//			return;
-//		}
-//		
-//		
-//		
-//		
-//		// It is important to ensure malicious server input is ignored.
-//		if (this.serverNetworkingIsMalformed)
-//		{
-//			return;
-//		}
-//		
-//		// check that the incoming message is within the expected size
-//		short commandLength = byteBuf.readShort();
-//		if (commandLength < 1 || commandLength > 32)
-//		{
-//			LOGGER.error("Server command length ["+commandLength+"] outside the expected range of 1 to 32 (inclusive).");
-//			ClientApi.INSTANCE.serverNetworkingIsMalformed = true;
-//			return;
-//		}
-//		
-//		// parse the command
-//		String eventType;
-//		try
-//		{
-//			eventType = byteBuf.readCharSequence(commandLength, StandardCharsets.UTF_8).toString();
-//		}
-//		catch (Exception e)
-//		{
-//			LOGGER.error("Server sent un-parsable command. Error: "+e.getMessage());
-//			return;
-//		}
-//		
-//		switch (eventType)
-//		{
-//			case "ServerCommsEnabled":
-//				LOGGER.info("Server supports DH multiverse protocol.");
-//				ClientApi.INSTANCE.isServerCommunicationEnabled = true;
-//				KEYED_CLIENT_LEVEL_MANAGER.setUseOverrideWrapper(true);
-//				MC.executeOnRenderThread(() -> 
-//				{
-//					// Unload the current world, since it may be wrong.
-//					// A followup WorldChanged event should be received from the server soon after this.
-//					LOGGER.info("Unloading current client level so the server can define the correct multiverse level.");
-//					this.clientLevelUnloadEvent((IClientLevelWrapper) MC.getWrappedClientWorld());
-//				});
-//				break;
-//			
-//			case "LevelChanged":
-//				short levelKeyLength = byteBuf.readShort();
-//				if (levelKeyLength < 1 || levelKeyLength > 128) // TODO 128 should be put into a constant somewhere
-//				{
-//					LOGGER.error("Server [LevelChanged] command length ["+commandLength+"] outside the expected range of 1 to 128 (inclusive).");
-//					this.serverNetworkingIsMalformed = true;
-//					return;
-//				}
-//				
-//				String levelKey = byteBuf.readCharSequence(levelKeyLength, StandardCharsets.UTF_8).toString();
-//				if (!levelKey.matches("[a-zA-Z0-9_]+"))
-//				{
-//					LOGGER.error("Server sent invalid world key name, and is being ignored.");
-//					this.isServerCommunicationEnabled = false;
-//					this.serverNetworkingIsMalformed = true;
-//					return;
-//				}
-//				
-//				LOGGER.info("Server level change event received, changing the level to ["+levelKey+"].");
-//				MC.executeOnRenderThread(() -> {
-//					if (MC.getWrappedClientWorld() != null)
-//					{
-//						this.clientLevelUnloadEvent((IClientLevelWrapper) MC.getWrappedClientWorld());
-//					}
-//					IServerKeyedClientLevel clientLevel = KEYED_CLIENT_LEVEL_MANAGER.getServerKeyedLevel(MC.getWrappedClientWorld(), levelKey);
-//					KEYED_CLIENT_LEVEL_MANAGER.setServerKeyedLevel(clientLevel);
-//					this.multiverseClientLevelLoadEvent(clientLevel);
-//				});
-//				break;
-//		}
-//	}
+	public void pluginMessageReceived(@NotNull AbstractNetworkMessage message)
+	{
+		NetworkSession networkSession = this.pluginChannelApi.networkSession;
+		if (networkSession != null)
+		{
+			networkSession.tryHandleMessage(message);
+		}
+	}
 	
 	
 	
@@ -499,7 +409,7 @@ public class ClientApi
 		
 		this.sendQueuedChatMessages();
 		
-		IProfilerWrapper profiler = MC.getProfiler();
+		IProfilerWrapper profiler = MC_CLIENT.getProfiler();
 		profiler.pop(); // get out of "terrain"
 		profiler.push("DH-RenderLevel");
 		
@@ -550,7 +460,12 @@ public class ClientApi
 			{
 				return;
 			}
-			IDhClientLevel level = dhClientWorld.getOrLoadClientLevel(levelWrapper);
+			
+			IDhClientLevel level = (IDhClientLevel) dhClientWorld.getLevel(levelWrapper);
+			if (level == null)
+			{
+				return;
+			}
 			
 			
 			if (this.rendererDisabledBecauseOfExceptions)
@@ -612,10 +527,10 @@ public class ClientApi
 			this.rendererDisabledBecauseOfExceptions = true;
 			LOGGER.error("Unexpected Renderer error in render pass [" + renderPass + "]. Error: " + e.getMessage(), e);
 			
-			MC.sendChatMessage("\u00A74\u00A7l\u00A7uERROR: Distant Horizons renderer has encountered an exception!");
-			MC.sendChatMessage("\u00A74Renderer disabled to try preventing GL state corruption.");
-			MC.sendChatMessage("\u00A74Toggle DH rendering via the config UI to re-activate DH rendering.");
-			MC.sendChatMessage("\u00A74Error: " + e);
+			MC_CLIENT.sendChatMessage("\u00A74\u00A7l\u00A7uERROR: Distant Horizons renderer has encountered an exception!");
+			MC_CLIENT.sendChatMessage("\u00A74Renderer disabled to try preventing GL state corruption.");
+			MC_CLIENT.sendChatMessage("\u00A74Toggle DH rendering via the config UI to re-activate DH rendering.");
+			MC_CLIENT.sendChatMessage("\u00A74Error: " + e);
 		}
 		finally
 		{
@@ -655,24 +570,24 @@ public class ClientApi
 		if (glfwKey == GLFW.GLFW_KEY_F8)
 		{
 			Config.Client.Advanced.Debugging.debugRendering.set(EDhApiDebugRendering.next(Config.Client.Advanced.Debugging.debugRendering.get()));
-			MC.sendChatMessage("F8: Set debug mode to " + Config.Client.Advanced.Debugging.debugRendering.get());
+			MC_CLIENT.sendChatMessage("F8: Set debug mode to " + Config.Client.Advanced.Debugging.debugRendering.get());
 		}
 		else if (glfwKey == GLFW.GLFW_KEY_F6)
 		{
 			Config.Client.Advanced.Debugging.rendererMode.set(EDhApiRendererMode.next(Config.Client.Advanced.Debugging.rendererMode.get()));
-			MC.sendChatMessage("F6: Set rendering to " + Config.Client.Advanced.Debugging.rendererMode.get());
+			MC_CLIENT.sendChatMessage("F6: Set rendering to " + Config.Client.Advanced.Debugging.rendererMode.get());
 		}
 		else if (glfwKey == GLFW.GLFW_KEY_P)
 		{
 			prefLoggerEnabled = !prefLoggerEnabled;
-			MC.sendChatMessage("P: Debug Pref Logger is " + (prefLoggerEnabled ? "enabled" : "disabled"));
+			MC_CLIENT.sendChatMessage("P: Debug Pref Logger is " + (prefLoggerEnabled ? "enabled" : "disabled"));
 		}
 	}
 	
 	private void sendQueuedChatMessages()
 	{
 		// dev build
-		if (ModInfo.IS_DEV_BUILD && !this.configOverrideReminderPrinted && MC.playerExists())
+		if (ModInfo.IS_DEV_BUILD && !this.configOverrideReminderPrinted && MC_CLIENT.playerExists())
 		{
 			this.configOverrideReminderPrinted = true;
 			
@@ -682,7 +597,7 @@ public class ClientApi
 					"\u00A72" + "Distant Horizons: nightly/unstable build, version: [" + ModInfo.VERSION+"]." + "\u00A7r\n" +
 					"Issues may occur with this version.\n" +
 					"Here be dragons!\n";
-			MC.sendChatMessage(message);
+			MC_CLIENT.sendChatMessage(message);
 		}
 		
 		// memory
@@ -703,7 +618,7 @@ public class ClientApi
 						"Stuttering or low FPS may occur. \n" +
 						"Please increase Minecraft's available memory to 4 gigabytes. \n" +
 						"This warning can be disabled in DH's config under Advanced -> Logging. \n";
-				MC.sendChatMessage(message);
+				MC_CLIENT.sendChatMessage(message);
 			}
 		}
 		
@@ -716,7 +631,7 @@ public class ClientApi
 				// done to prevent potential null pointers
 				message = "";
 			}
-			MC.sendChatMessage(message);
+			MC_CLIENT.sendChatMessage(message);
 		}
 	}
 	
@@ -0,0 +1,134 @@
+package com.seibel.distanthorizons.core.api.internal;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
+import com.seibel.distanthorizons.core.level.IKeyedClientLevelManager;
+import com.seibel.distanthorizons.core.level.IServerKeyedClientLevel;
+import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
+import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent;
+import com.seibel.distanthorizons.core.network.messages.base.CurrentLevelKeyMessage;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
+import org.apache.logging.log4j.LogManager;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Objects;
+import java.util.function.Consumer;
+
+/**
+ * This class is used to manage the level keys.
+ */
+public class ClientPluginChannelApi
+{
+	private static final ConfigBasedLogger LOGGER = new ConfigBasedLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get());
+	private static final IMinecraftClientWrapper MC = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	private static final IKeyedClientLevelManager KEYED_CLIENT_LEVEL_MANAGER = SingletonInjector.INSTANCE.get(IKeyedClientLevelManager.class);
+	
+	private final Consumer<IServerKeyedClientLevel> levelLoadHandler;
+	private final Consumer<IClientLevelWrapper> levelUnloadHandler;
+	
+	@Nullable
+	public NetworkSession networkSession;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public ClientPluginChannelApi(Consumer<IServerKeyedClientLevel> levelLoadHandler, Consumer<IClientLevelWrapper> levelUnloadHandler)
+	{
+		this.levelLoadHandler = levelLoadHandler;
+		this.levelUnloadHandler = levelUnloadHandler;
+	}
+	
+	
+	
+	//============//
+	// properties //
+	//============//
+	
+	/** @return true if the level loading is handled by the server */
+	public boolean allowLevelLoading(IClientLevelWrapper level)
+	{
+		return (KEYED_CLIENT_LEVEL_MANAGER.hasLevelSet() && level instanceof IServerKeyedClientLevel)
+				|| !KEYED_CLIENT_LEVEL_MANAGER.hasLevelSet();
+	}
+	
+	
+	
+	//================//
+	// network events //
+	//================//
+	
+	/** fired when this client connects to a server with DH support */
+	public void onJoinServer(@NonNull NetworkSession networkSession)
+	{
+		Objects.requireNonNull(networkSession);
+		this.networkSession = networkSession;
+		this.networkSession.registerHandler(CurrentLevelKeyMessage.class, this::onCurrentLevelKeyMessage);
+		this.networkSession.registerHandler(CloseInternalEvent.class, this::onClose);
+	}
+	
+	private void onCurrentLevelKeyMessage(CurrentLevelKeyMessage msg)
+	{
+		// prefix@namespace:path
+		// 1-50 characters in total, all parts except namespace can be omitted
+		if (!msg.levelKey.matches("^(?=.{1,50}$)([a-zA-Z0-9-_]+@)?[a-zA-Z0-9-_]+(:[a-zA-Z0-9-_]+)?$"))
+		{
+			throw new IllegalArgumentException("Server sent invalid level key.");
+		}
+		
+		LOGGER.info("Server level key received: [" + msg.levelKey + "].");
+		
+		MC.executeOnRenderThread(() -> 
+		{
+			IClientLevelWrapper clientLevel = MC.getWrappedClientLevel(true);
+			IServerKeyedClientLevel existingKeyedClientLevel = KEYED_CLIENT_LEVEL_MANAGER.getServerKeyedLevel();
+
+			if (existingKeyedClientLevel != null)
+			{
+				if (!existingKeyedClientLevel.getServerLevelKey().equals(msg.levelKey))
+				{
+					LOGGER.info("Unloading previous level with key: [" + existingKeyedClientLevel.getServerLevelKey() + "].");
+					this.levelUnloadHandler.accept(existingKeyedClientLevel);
+				}
+				else
+				{
+					LOGGER.info("Level key matches the previous level key, ignoring the message.");
+				}
+			}
+			else
+			{
+				LOGGER.info("Unloading non-keyed level: [" + clientLevel.getDimensionName() + "].");
+				this.levelUnloadHandler.accept(clientLevel);
+			}
+			
+			if (existingKeyedClientLevel == null || !existingKeyedClientLevel.getServerLevelKey().equals(msg.levelKey))
+			{
+				LOGGER.info("Loading level with key: [" + msg.levelKey + "].");
+				IServerKeyedClientLevel keyedLevel = KEYED_CLIENT_LEVEL_MANAGER.setServerKeyedLevel(clientLevel, msg.levelKey);
+				this.levelLoadHandler.accept(keyedLevel);
+			}
+		});
+	}
+	
+	public void onClientLevelUnload() { KEYED_CLIENT_LEVEL_MANAGER.clearKeyedLevel(); }
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	private void onClose(CloseInternalEvent event) { this.reset(); }
+	public void reset()
+	{
+		this.networkSession = null;
+		KEYED_CLIENT_LEVEL_MANAGER.clearKeyedLevel();
+	}
+	
+}
@@ -21,13 +21,9 @@ package com.seibel.distanthorizons.core.api.internal;

 import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelLoadEvent;
 import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiLevelUnloadEvent;
-import com.seibel.distanthorizons.core.config.Config;
-import com.seibel.distanthorizons.core.generation.DhLightingEngine;
-import com.seibel.distanthorizons.core.util.ThreadUtil;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
 import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
-import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
-import com.seibel.distanthorizons.core.level.IDhLevel;
 import com.seibel.distanthorizons.core.world.AbstractDhWorld;
 import com.seibel.distanthorizons.core.world.DhClientServerWorld;
 import com.seibel.distanthorizons.core.world.DhServerWorld;
@@ -37,6 +33,7 @@ import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
 import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.NotNull;

 /**
 * This holds the methods that should be called by the host mod loader (Fabric,
@@ -70,7 +67,7 @@ public class ServerApi
 			if (serverWorld != null)
 			{
 				serverWorld.serverTick();
-				SharedApi.worldGenTick(serverWorld::doWorldGen);
+				SharedApi.worldGenTick(serverWorld::worldGenTick);
 			}
 		}
 		catch (Exception e)
@@ -152,19 +149,37 @@ public class ServerApi
 	public void serverPlayerJoinEvent(IServerPlayerWrapper player)
 	{
 		IDhServerWorld serverWorld = SharedApi.getIDhServerWorld();
-		if (serverWorld instanceof DhServerWorld) // TODO add support for DhClientServerWorld's (lan worlds) as well
+		LOGGER.info("Player [${player.getName()}] joined.");
+		if (serverWorld != null)
 		{
-			LOGGER.debug("Waiting for player to connect: " + player.getUUID());
-			((DhServerWorld) serverWorld).addPlayer(player);
+			serverWorld.addPlayer(player);
 		}
 	}
 	public void serverPlayerDisconnectEvent(IServerPlayerWrapper player)
 	{
 		IDhServerWorld serverWorld = SharedApi.getIDhServerWorld();
-		if (serverWorld instanceof DhServerWorld) // TODO add support for DhClientServerWorld's (lan worlds) as well
+		LOGGER.info("Player [${player.getName()}] disconnected.");
+		if (serverWorld != null)
 		{
-			LOGGER.debug("Removing player from connect wait list: " + player.getUUID());
-			((DhServerWorld) serverWorld).removePlayer(player);
+			serverWorld.removePlayer(player);
+		}
+	}
+	public void serverPlayerLevelChangeEvent(IServerPlayerWrapper player, IServerLevelWrapper originLevel, IServerLevelWrapper destinationLevel)
+	{
+		IDhServerWorld serverWorld = SharedApi.getIDhServerWorld();
+		LOGGER.info("Player [${player.getName()}] changed level: [${originLevel.getKeyedLevelDimensionName()}] -> [${destinationLevel.getKeyedLevelDimensionName()}].");
+		if (serverWorld != null)
+		{
+			serverWorld.changePlayerLevel(player, originLevel, destinationLevel);
+		}
+	}
+	
+	public void pluginMessageReceived(IServerPlayerWrapper player, @NotNull AbstractNetworkMessage message)
+	{
+		IDhServerWorld serverWorld = SharedApi.getIDhServerWorld();
+		if (serverWorld != null)
+		{
+			serverWorld.getServerPlayerStateManager().handlePluginMessage(player, message);
 		}
 	}
 	
@@ -31,11 +31,11 @@ import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
 import com.seibel.distanthorizons.core.sql.repo.AbstractDhRepo;
 import com.seibel.distanthorizons.core.util.LodUtil;
-import com.seibel.distanthorizons.core.util.TimerUtil;
 import com.seibel.distanthorizons.core.util.objects.Pair;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
 import com.seibel.distanthorizons.core.world.*;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftRenderWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
@@ -44,6 +44,7 @@ import org.jetbrains.annotations.Nullable;

 import java.util.*;
 import java.util.concurrent.*;
+import java.util.concurrent.locks.ReentrantLock;

 /** Contains code and variables used by both {@link ClientApi} and {@link ServerApi} */
 public class SharedApi
@@ -52,18 +53,15 @@ public class SharedApi
 	
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
 	private static final IMinecraftRenderWrapper MC_RENDER = SingletonInjector.INSTANCE.get(IMinecraftRenderWrapper.class);
-	private static final Set<DhChunkPos> UPDATING_CHUNK_POS_SET = ConcurrentHashMap.newKeySet();
-	/** how many chunks can be queued for updating per thread, used to prevent updates from infinitely pilling up if the user flys around extremely fast */
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	
+	private static final UpdateChunkPosManager UPDATE_POS_MANAGER = new UpdateChunkPosManager();
+	/** how many chunks can be queued for updating per thread, used to prevent updates from infinitely pilling up if the user flies around extremely fast */
 	private static final int MAX_UPDATING_CHUNK_COUNT_PER_THREAD = 500;
-	private static final int MIN_MS_BETWEEN_OVERLOADED_LOG_MESSAGE = 30_000;
-	
-	private static final Timer CHUNK_UPDATE_TIMER = TimerUtil.CreateTimer("ChunkUpdateTimer");
-	
 	
 	
 	private static AbstractDhWorld currentWorld;
 	private static int lastWorldGenTickDelta = 0;
-	private static long lastOverloadedLogMessageMsTime = 0;
 	
 	
 	
@@ -100,7 +98,7 @@ public class SharedApi
 			// shouldn't be necessary, but if we missed closing one of the connections this should make sure they're all closed
 			AbstractDhRepo.closeAllConnections();
 			// needs to be closed on world shutdown to clear out un-processed chunks
-			UPDATING_CHUNK_POS_SET.clear();
+			UPDATE_POS_MANAGER.clear();
 			
 			// recommend that the garbage collector cleans up any objects from the old world and thread pools
 			System.gc();
@@ -119,11 +117,11 @@ public class SharedApi
 	
 	public static AbstractDhWorld getAbstractDhWorld() { return currentWorld; }
 	/** returns null if the {@link SharedApi#currentWorld} isn't a {@link DhClientServerWorld} */
-	public static DhClientServerWorld getDhClientServerWorld() { return (currentWorld != null && DhClientServerWorld.class.isInstance(currentWorld)) ? (DhClientServerWorld) currentWorld : null; }
+	public static DhClientServerWorld getDhClientServerWorld() { return (currentWorld instanceof DhClientServerWorld) ? (DhClientServerWorld) currentWorld : null; }
 	/** returns null if the {@link SharedApi#currentWorld} isn't a {@link DhClientWorld} or {@link DhClientServerWorld} */
-	public static IDhClientWorld getIDhClientWorld() { return (currentWorld != null && IDhClientWorld.class.isInstance(currentWorld)) ? (IDhClientWorld) currentWorld : null; }
+	public static IDhClientWorld getIDhClientWorld() { return (currentWorld instanceof IDhClientWorld) ? (IDhClientWorld) currentWorld : null; }
 	/** returns null if the {@link SharedApi#currentWorld} isn't a {@link DhServerWorld} or {@link DhClientServerWorld} */
-	public static IDhServerWorld getIDhServerWorld() { return (currentWorld != null && IDhServerWorld.class.isInstance(currentWorld)) ? (IDhServerWorld) currentWorld : null; }
+	public static IDhServerWorld getIDhServerWorld() { return (currentWorld instanceof IDhServerWorld) ? (IDhServerWorld) currentWorld : null; }
 	
 	
 	
@@ -136,10 +134,10 @@ public class SharedApi
 	 * This is important since asking MC for a chunk is slow and may block the render thread.
 	 */
 	public static boolean isChunkAtBlockPosAlreadyUpdating(int blockPosX, int blockPosZ)
-	{ return UPDATING_CHUNK_POS_SET.contains(new DhChunkPos(new DhBlockPos2D(blockPosX, blockPosZ))); }
+	{ return UPDATE_POS_MANAGER.contains(new DhChunkPos(new DhBlockPos2D(blockPosX, blockPosZ))); }
 	
 	public static boolean isChunkAtChunkPosAlreadyUpdating(int chunkPosX, int chunkPosZ)
-	{ return UPDATING_CHUNK_POS_SET.contains(new DhChunkPos(chunkPosX, chunkPosZ)); }
+	{ return UPDATE_POS_MANAGER.contains(new DhChunkPos(chunkPosX, chunkPosZ)); }
 	
 	
 	/** handles both block place and break events */
@@ -188,43 +186,6 @@ public class SharedApi
 		
 		
 		
-		//=====================//
-		// task limiting check //
-		//=====================//
-		
-		int currentQueueCount = UPDATING_CHUNK_POS_SET.size();
-		int maxQueueCount = MAX_UPDATING_CHUNK_COUNT_PER_THREAD * Config.Client.Advanced.MultiThreading.numberOfLodBuilderThreads.get();
-		if (currentQueueCount >= maxQueueCount)
-		{
-			// The maximum number of chunks are already queued, don't add more.
-			// This is done to prevent overloading the system if the user fly's extremely fast and queues too many chunks
-			
-			long msBetweenLastLog = System.currentTimeMillis() - lastOverloadedLogMessageMsTime;
-			if (msBetweenLastLog >= MIN_MS_BETWEEN_OVERLOADED_LOG_MESSAGE)
-			{
-				lastOverloadedLogMessageMsTime = System.currentTimeMillis();
-				
-				String message = "Distant Horizons overloaded, too many chunks queued for updating. " +
-						"\nThis may result in holes in your LODs. " +
-						"\nPlease move through the world slower, decrease your vanilla render distance, slow down your world pre-generator, or increase the Distant Horizons' CPU load config. " +
-						"\nMax queue count ["+maxQueueCount+"] (["+MAX_UPDATING_CHUNK_COUNT_PER_THREAD+"] per thread).";
-				ClientApi.INSTANCE.showChatMessageNextFrame(message);
-				LOGGER.warn(message);
-			}
-			
-			return;
-		}
-		
-		// prevent duplicate update requests
-		if (UPDATING_CHUNK_POS_SET.contains(chunkWrapper.getChunkPos()))
-		{
-			// this chunk is already being updated
-			return;
-		}
-		UPDATING_CHUNK_POS_SET.add(chunkWrapper.getChunkPos());
-		
-		
-		
 		//===============================//
 		// update the necessary chunk(s) //
 		//===============================//
@@ -233,7 +194,7 @@ public class SharedApi
 		{
 			// only update the center chunk
 			
-			bakeChunkLightingAndSendToLevelAsync(chunkWrapper, null, dhLevel);
+			queueChunkUpdate(chunkWrapper, null, dhLevel);
 		}
 		else
 		{
@@ -267,27 +228,58 @@ public class SharedApi
 			// light and send the chunks
 			for (IChunkWrapper litChunk : neighbourChunkList)
 			{
-				bakeChunkLightingAndSendToLevelAsync(litChunk, neighbourChunkList, dhLevel);
+				queueChunkUpdate(litChunk, neighbourChunkList, dhLevel);
 			}
 		}
 	}
-	/** returning a {@link CompletableFuture} isn't necessary, but allows Intellij to properly show the full stack trace when debugging. */
-	@SuppressWarnings("UnusedReturnValue")
-	private static CompletableFuture<Void> bakeChunkLightingAndSendToLevelAsync(IChunkWrapper chunkWrapper, @Nullable ArrayList<IChunkWrapper> neighbourChunkList, IDhLevel dhLevel)
+	private static void queueChunkUpdate(IChunkWrapper chunkWrapper, @Nullable ArrayList<IChunkWrapper> neighbourChunkList, IDhLevel dhLevel)
 	{
-		// lighting the chunk needs to be done on a separate thread to prevent lagging any of the event threads
-		ThreadPoolExecutor executor = ThreadPoolUtil.getChunkToLodBuilderExecutor();
-		if (executor == null)
+		if (MC_CLIENT != null && MC_CLIENT.playerExists())
 		{
-			return CompletableFuture.completedFuture(null);
+			UPDATE_POS_MANAGER.setCenter(MC_CLIENT.getPlayerChunkPos());
+			UPDATE_POS_MANAGER.maxSize = MAX_UPDATING_CHUNK_COUNT_PER_THREAD * Config.Client.Advanced.MultiThreading.numberOfLodBuilderThreads.get();
 		}
 		
+		UpdateChunkData updateData = new UpdateChunkData(chunkWrapper, neighbourChunkList, dhLevel);
+		UPDATE_POS_MANAGER.addItem(chunkWrapper.getChunkPos(), updateData);
+		
+		
+		
+		// queue updates up to the number of CPU cores allocated for the job
+		// (this prevents doing extra work queuing tasks that may not be necessary)
+		// and makes sure the chunks closest to the player are updated first
+		ThreadPoolExecutor executor = ThreadPoolUtil.getChunkToLodBuilderExecutor();
+		if (executor != null && executor.getQueue().size() < executor.getCorePoolSize())
+		{
 			try
 			{
-			return CompletableFuture.runAsync(() ->		
+				executor.execute(SharedApi::processQueuedChunkUpdate);
+			}
+			catch (RejectedExecutionException ignore)
+			{
+				// the executor was shut down, it should be back up shortly and able to accept new jobs
+			}
+		}
+	}
+	
+	
+	/** returning a {@link CompletableFuture} isn't necessary, but allows Intellij to properly show the full stack trace when debugging. */
+	@SuppressWarnings("UnusedReturnValue")
+	private static void processQueuedChunkUpdate()
 	{
 		//LOGGER.trace(chunkWrapper.getChunkPos() + " " + executor.getActiveCount() + " / " + executor.getQueue().size() + " - " + executor.getCompletedTaskCount());
 		
+		UpdateChunkData updateData = UPDATE_POS_MANAGER.popClosest();
+		if (updateData == null)
+		{
+			return;
+		}
+		
+		IChunkWrapper chunkWrapper = updateData.chunkWrapper;
+		@Nullable ArrayList<IChunkWrapper> neighbourChunkList = updateData.neighbourChunkList;
+		IDhLevel dhLevel = updateData.dhLevel;
+		
+		
 		try
 		{
 			boolean checkChunkHash = !Config.Client.Advanced.LodBuilding.disableUnchangedChunkCheck.get();
@@ -324,41 +316,8 @@ public class SharedApi
 			}
 			
 			
-					// chunk light baking is disabled since profiling revealed it used
-					// roughly the same amount of time as generating the lighting ourselves and
-					// was much more likely to have issues with corrupt (all black or all bright) chunks
-					boolean tryUsingMcLightingEngine = false;
-					if (tryUsingMcLightingEngine)
-					{
-						// Save or populate the chunk wrapper's lighting
-						// this is done so we don't have to worry about MC unloading the lighting data for this chunk
-						boolean chunkLightPopulated = false;
-						boolean onlyUseDhLighting = Config.Client.Advanced.LodBuilding.onlyUseDhLightingEngine.get();
-						if (!onlyUseDhLighting && chunkWrapper.isLightCorrect())
-						{
-							// If MC's lighting engine isn't thread safe this may cause the server thread to lag
-							chunkLightPopulated = chunkWrapper.bakeDhLightingUsingMcLightingEngine(dhLevel.getLevelWrapper());
-							if (!chunkLightPopulated)
-							{
-								// clear any existing data to prevent partial or corrupt lighting
-								// when re-generating it
-								chunkWrapper.clearDhBlockLighting();
-								chunkWrapper.clearDhSkyLighting();
-							}
-						}
-						
-						// something went wrong during the baking process so we have to generate the lighting ourselves
-						if (!chunkLightPopulated)
-						{
-							DhLightingEngine.INSTANCE.lightChunk(chunkWrapper, nearbyChunkList, dhLevel.hasSkyLight() ? LodUtil.MAX_MC_LIGHT : LodUtil.MIN_MC_LIGHT);
-						}
-					}
-					else
-					{
-						DhLightingEngine.INSTANCE.lightChunk(chunkWrapper, nearbyChunkList, dhLevel.hasSkyLight() ? LodUtil.MAX_MC_LIGHT : LodUtil.MIN_MC_LIGHT);
-					}
-					
-					
+			// sky lighting is populated later at the data source level
+			DhLightingEngine.INSTANCE.bakeChunkBlockLighting(chunkWrapper, nearbyChunkList, dhLevel.hasSkyLight() ? LodUtil.MAX_MC_LIGHT : LodUtil.MIN_MC_LIGHT);
 			
 			dhLevel.updateBeaconBeamsForChunk(chunkWrapper, nearbyChunkList);
 			dhLevel.updateChunkAsync(chunkWrapper, newChunkHash);
@@ -369,29 +328,19 @@ public class SharedApi
 		}
 		finally
 		{
-					// the LOD chunk has finished being updated
-					int updateTimeoutInSec = Config.Client.Advanced.LodBuilding.minTimeBetweenChunkUpdatesInSeconds.get();
-					if (updateTimeoutInSec != 0)
+			// queue the next position if there are still positions to process
+			ThreadPoolExecutor executor = ThreadPoolUtil.getChunkToLodBuilderExecutor();
+			if (executor != null && !UPDATE_POS_MANAGER.positionMap.isEmpty())
 			{
-						// prevent updating this chunk again until the timeout finishes
-						CHUNK_UPDATE_TIMER.schedule(new TimerTask()
+				try
 				{
-							@Override
-							public void run() { UPDATING_CHUNK_POS_SET.remove(chunkWrapper.getChunkPos()); }
-						}, updateTimeoutInSec * 1000L);
-					}
-					else
-					{
-						// instantly allow this chunk to be updated again
-						UPDATING_CHUNK_POS_SET.remove(chunkWrapper.getChunkPos());
-					}
-				}
-			}, executor);
+					executor.execute(SharedApi::processQueuedChunkUpdate);
 				}
 				catch (RejectedExecutionException ignore)
 				{
 					// the executor was shut down, it should be back up shortly and able to accept new jobs
-			return CompletableFuture.completedFuture(null);
+				}
+			}
 		}
 	}
 	
@@ -403,11 +352,185 @@ public class SharedApi
 	
 	public String getDebugMenuString()
 	{
-		int maxUpdateCount = MAX_UPDATING_CHUNK_COUNT_PER_THREAD * Config.Client.Advanced.MultiThreading.numberOfLodBuilderThreads.get();
-		String updatingCountStr = F3Screen.NUMBER_FORMAT.format(UPDATING_CHUNK_POS_SET.size());
-		String maxUpdateCountStr = F3Screen.NUMBER_FORMAT.format(maxUpdateCount);
+		String updatingCountStr = F3Screen.NUMBER_FORMAT.format(UPDATE_POS_MANAGER.closestQueue.size());
+		String maxUpdateCountStr = F3Screen.NUMBER_FORMAT.format(UPDATE_POS_MANAGER.maxSize);
 		return "Queued chunk updates: "+updatingCountStr+" / "+maxUpdateCountStr;
 	}
 	
 	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	/** contains the objects needed to update a chunk */
+	private static class UpdateChunkData
+	{
+		public IChunkWrapper chunkWrapper;
+		@Nullable
+		public ArrayList<IChunkWrapper> neighbourChunkList;
+		public IDhLevel dhLevel;
+		
+		public UpdateChunkData(IChunkWrapper chunkWrapper, @Nullable ArrayList<IChunkWrapper> neighbourChunkList, IDhLevel dhLevel)
+		{
+			this.chunkWrapper = chunkWrapper;
+			this.neighbourChunkList = neighbourChunkList;
+			this.dhLevel = dhLevel;
+		}
+	}
+	
+	/** keeps track of which chunks need to be updated */
+	private static class UpdateChunkPosManager
+	{
+		private final PriorityQueue<DhChunkPos> closestQueue;
+		private final PriorityQueue<DhChunkPos> furthestQueue;
+		private final HashMap<DhChunkPos, UpdateChunkData> positionMap;
+		
+		private final ReentrantLock lock = new ReentrantLock();
+		
+		private DhChunkPos center;
+		private int maxSize = 500;
+		
+		
+		
+		//=============//
+		// constructor //
+		//=============//
+		
+		public UpdateChunkPosManager()
+		{
+			this.closestQueue = new PriorityQueue<>(Comparator.comparingDouble(pos -> pos.squaredDistance(this.center)));
+			this.furthestQueue = new PriorityQueue<>(Comparator.comparingDouble(pos -> ((DhChunkPos)pos).squaredDistance(this.center)).reversed());
+			this.positionMap = new HashMap<>();
+			// defaulting to 0,0 is fine since it'll be updated once we start adding items 
+			this.center = new DhChunkPos(0, 0);
+		}
+		
+		
+		
+		//==================//
+		// list/set methods //
+		//==================//
+		
+		public boolean contains(DhChunkPos pos)
+		{
+			try
+			{
+				this.lock.lock();
+				
+				return this.positionMap.containsKey(pos);
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+		public void clear()
+		{
+			try
+			{
+				this.lock.lock();
+				
+				this.positionMap.clear();
+				this.closestQueue.clear();
+				this.furthestQueue.clear();
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+		public void addItem(DhChunkPos pos, UpdateChunkData updateData)
+		{
+			try
+			{
+				this.lock.lock();
+				
+				if (this.positionMap.containsKey(pos))
+				{
+					return;
+				}
+				
+				if (this.positionMap.size() >= this.maxSize)
+				{
+					// Remove item furthest from the center
+					DhChunkPos furthest = this.furthestQueue.poll();
+					this.closestQueue.remove(furthest);
+					this.positionMap.remove(furthest);
+				}
+				
+				this.positionMap.put(pos, updateData);
+				this.closestQueue.add(pos);
+				this.furthestQueue.add(pos);
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+		
+		
+		//==================//
+		// position methods //
+		//==================//
+		
+		public void setCenter(DhChunkPos newCenter)
+		{
+			// if the rebuild time takes too long 
+			// (in James' testing a queue of 500 items only took around 0.1 milliseconds)
+			// this equation could be changed to only update after moving 2 or 4 chunks from the center
+			if (newCenter.equals(this.center))
+			{
+				return;
+			}
+			
+			try
+			{
+				this.lock.lock();
+				
+				this.center = newCenter;
+				
+				// rebuild the priority queues to match the new center
+				this.closestQueue.clear();
+				this.furthestQueue.clear();
+				for (DhChunkPos pos : this.positionMap.keySet())
+				{
+					this.closestQueue.add(pos);
+					this.furthestQueue.add(pos);
+				}
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+		public UpdateChunkData popClosest()
+		{
+			if (this.closestQueue.isEmpty())
+			{
+				return null;
+			}
+			
+			try
+			{
+				this.lock.lock();
+				
+				DhChunkPos closest = this.closestQueue.poll();
+				this.furthestQueue.remove(closest);
+				return this.positionMap.remove(closest);
+			}
+			finally
+			{
+				this.lock.unlock();
+			}
+		}
+		
+	}
+	
+	
+	
 }
@@ -43,6 +43,7 @@ import javax.swing.*;
 import java.awt.*;
 import java.util.*;
 import java.util.List;
+import java.util.concurrent.ThreadLocalRandom;


 /**
@@ -163,9 +164,19 @@ public class Config
 							.build();
 					
 					public static ConfigEntry<Integer> lodChunkRenderDistanceRadius = new ConfigEntry.Builder<Integer>()
+							.setServersideShortName("renderDistanceRadius")
 							.setMinDefaultMax(32, 128, 4096)
-							.comment("The radius of the mod's render distance. (measured in chunks)")
+							.comment("" +
+									"The radius of the mod's render distance. (measured in chunks)\n" +
+									"On server changes the distance players will receive real-time updates for, if enabled." +
+									"\n" +
+									"Note for servers:\n" +
+									"This setting does not prevent players from generating farther out.\n" +
+									"If you want to limit performance impact, change rate limits\n" +
+									"and thread count/runtime ratio settings instead.\n" +
+									"It also does not affect the visuals on clients.")
 							.setPerformance(EConfigEntryPerformance.HIGH)
+							.setSide(EConfigEntryRelevantSide.BOTH)
 							.build();
 					
 					public static ConfigEntry<EDhApiVerticalQuality> verticalQuality = new ConfigEntry.Builder<EDhApiVerticalQuality>()
@@ -563,6 +574,14 @@ public class Config
 									+ "")
 							.build();
 					
+					public static ConfigEntry<Boolean> enableInstancedRendering = new ConfigEntry.Builder<Boolean>()
+							.set(true)
+							.comment(""
+									+ "Can be disabled to use much slower but more compatible direct rendering. \n"
+									+ "Disabling this can be used to fix some crashes on Mac. \n"
+									+ "")
+							.build();
+					
 				}
 				
 				public static class AdvancedGraphics
@@ -719,16 +738,16 @@ public class Config
 			public static class WorldGenerator
 			{
 				public static ConfigEntry<Boolean> enableDistantGeneration = new ConfigEntry.Builder<Boolean>()
+						.setServersideShortName("enableDistantGeneration")
 						.set(true)
 						.comment(""
 								+ " Should Distant Horizons slowly generate LODs \n"
-								+ " outside the vanilla render distance?\n"
-								+ "\n"
-								+ " Note: when on a server, distant generation isn't supported \n"
-								+ " and will always be disabled.")
+								+ " outside the vanilla render distance?")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiDistantGeneratorMode> distantGeneratorMode = new ConfigEntry.Builder<EDhApiDistantGeneratorMode>()
+						.setServersideShortName("distantGeneratorMode")
 						.set(EDhApiDistantGeneratorMode.FEATURES)
 						.comment(""
 								+ "How detailed should LODs be generated outside the vanilla render distance? \n"
@@ -758,32 +777,36 @@ public class Config
 								+ EDhApiDistantGeneratorMode.FEATURES + " \n"
 								+ "Generate everything except structures. \n"
 								+ "WARNING: This may cause world generator bugs or instability when paired with certain world generator mods. \n"
+								//not currently implemented
+								//+ "\n"
+								//+ EDhApiDistantGeneratorMode.FULL + " \n"
+								//+ "Ask the local server to generate/load each chunk. \n"
+								//+ "This is the most compatible, but will cause server/simulation lag. \n"
+								//+ "- Slow (15-50 ms, with spikes up to 200 ms) \n"
 								+ "")
-						/*
-							// FULL isn't currently implemented
-							+ "\n"
-							+ EDhApiDistantGeneratorMode.FULL + " \n"
-							+ "Ask the local server to generate/load each chunk. \n"
-							+ "This is the most compatible, but will cause server/simulation lag. \n"
-							+ "- Slow (15-50 ms, with spikes up to 200 ms) \n"
-						*/
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<Integer> worldGenerationTimeoutLengthInSeconds = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("worldGenerationTimeout")
 						.setMinDefaultMax(5, 60 * 3, 60 * 10/*10 minutes*/ )
 						.comment(""
 								+ "How long should a world generator thread run for before timing out? \n"
 								+ "Note: If you are experiencing timeout errors it is better to lower your CPU usage first \n"
 								+ "via the thread config before changing this value. \n"
 								+ "")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 			}
 			
 			public static class LodBuilding
 			{
+				@Deprecated
 				public static ConfigEntry<Integer> minTimeBetweenChunkUpdatesInSeconds = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("minTimeBetweenChunkUpdates")
 						.setMinDefaultMax(0, 1, 60)
+						.setAppearance(EConfigEntryAppearance.ONLY_IN_API)
 						.comment(""
 								+ "Determines how long must pass between LOD chunk updates before another. \n"
 								+ "update can occur\n"
@@ -884,7 +907,7 @@ public class Config
 						.build();
 				
 				public static ConfigEntry<String> ignoredRenderBlockCsv = new ConfigEntry.Builder<String>()
-						.set("minecraft:barrier,minecraft:structure_void,minecraft:light,minecraft:tripwire")
+						.set("minecraft:barrier,minecraft:structure_void,minecraft:light,minecraft:tripwire,minecraft:brown_mushroom")
 						.comment(""
 								+ "A comma separated list of block resource locations that won't be rendered by DH. \n"
 								+ "Note: air is always included in this list. \n"
@@ -965,28 +988,99 @@ public class Config
 								+ "")
 						.build();
 				
-				// not currently implemented
-				private static ConfigEntry<Boolean> enableMultiverseNetworking = new ConfigEntry.Builder<Boolean>()
+				
+				
+				public static ConfigCategory serverNetworking = new ConfigCategory.Builder().set(ServerNetworking.class).build();
+				
+				public static class ServerNetworking
+				{
+					public static ConfigUIComment generalSectionNote = new ConfigUIComment();
+					public static ConfigEntry<Boolean> enableServerNetworking = new ConfigEntry.Builder<Boolean>()
+							.setServersideShortName("enableServerNetworking")
 							.set(true)
 							.comment(""
-								+ "If true Distant Horizons will attempt to communicate with the connected \n"
-								+ "server in order to improve multiverse support. \n"
+									+ "WARNING!\n"
+									+ "Server-client networking is not yet fully implemented!\n"
+									+ "Both the server and client must be running the server-side fork with this option enabled\n"
+									+ "for Distant Horizons data to be transceived.\n"
+									+ "\n"
+									+ "If true, the server and client will attempt to communicate to transceive Distant Horizons data.\n"
+									+ "This allows for further distant generation and LOD updates on all clients.\n"
+									+ "\n"
+									+ "This should only be used on trusted servers with trusted players!\n"
 									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
 							.build();
 					
-				// not currently implemented
-				private static ConfigEntry<Boolean> enableServerNetworking = new ConfigEntry.Builder<Boolean>()
+					
+					public static ConfigEntry<Boolean> sendLevelKeys = new ConfigEntry.Builder<Boolean>()
+							.setServersideShortName("sendLevelKeys")
+							.setAppearance(EConfigEntryAppearance.ONLY_IN_FILE)
+							.set(true)
+							.comment(""
+									+ "Makes the server send level keys for each world.\n"
+									+ "Disable this if you use alternative ways to send level keys.\n"
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					public static ConfigEntry<String> levelKeyPrefix = new ConfigEntry.Builder<String>()
+							.setServersideShortName("levelKeyPrefix")
+							.setAppearance(EConfigEntryAppearance.ONLY_IN_FILE)
+							.set(getDefaultLevelKeyPrefix())
+							.comment(""
+									+ "Prefix of the level keys sent to the clients.\n"
+									+ "Should be set to a unique value for each backend server behind a proxy,\n"
+									+ "or empty if you don't use a proxy.\n"
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					
+					
+					public static ConfigUIComment generationSectionNote = new ConfigUIComment();
+					public static ConfigEntry<Integer> generationRequestRateLimit = new ConfigEntry.Builder<Integer>()
+							.setServersideShortName("generationRequestRateLimit")
+							.setMinDefaultMax(1, 20, 100)
+							.comment(""
+									+ "How many LOD generation requests per second should a client send? \n"
+									+ "Also limits the amount of player's requests allowed to stay in the server's queue."
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					
+					
+					public static ConfigUIComment realTimeUpdatesSectionNote = new ConfigUIComment();
+					public static ConfigEntry<Boolean> enableRealTimeUpdates = new ConfigEntry.Builder<Boolean>()
+							.setServersideShortName("enableRealTimeUpdates")
 							.set(false)
 							.comment(""
-								+ "Attention: this is only for developers and hasn't been implemented.\n"
-								+ "\n"
-								+ "If true Distant Horizons will attempt to communicate with the connected \n"
-								+ "server in order to load LODs outside your vanilla render distance. \n"
-								+ "\n"
-								+ "Note: This requires DH to be installed on the server in order to function. \n"
+									+ "If true, the client will receive real-time LOD updates for chunks outside the client's render distance."
 									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
 							.build();
 					
+					
+					// TODO rename
+					public static ConfigUIComment syncOnLoginSectionNote = new ConfigUIComment();
+					public static ConfigEntry<Boolean> synchronizeOnLogin = new ConfigEntry.Builder<Boolean>()
+							.setServersideShortName("synchronizeOnLogin")
+							.set(false)
+							.comment(""
+									+ "If true, clients will receive updated LODs on join if any changes occurred since last join."
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+					
+					public static ConfigEntry<Integer> syncOnLoginRateLimit = new ConfigEntry.Builder<Integer>()
+							.setServersideShortName("syncOnLoginRateLimit")
+							.setMinDefaultMax(1, 50, 100)
+							.comment(""
+									+ "How many LOD sync requests per second should a client send? \n"
+									+ "Also limits the amount of player's requests allowed to stay in the server's queue."
+									+ "")
+							.setSide(EConfigEntryRelevantSide.BOTH)
+							.build();
+				}
+				
 			}
 			
 			public static class MultiThreading
@@ -1007,6 +1101,7 @@ public class Config
 				
 				
 				public static final ConfigEntry<Integer> numberOfWorldGenerationThreads = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("numberOfWorldGenerationThreads")
 						.setMinDefaultMax(1,
 								ThreadPresetConfigEventHandler.getWorldGenDefaultThreadCount(),
 								Runtime.getRuntime().availableProcessors())
@@ -1020,13 +1115,17 @@ public class Config
 								+ "generation speed, increase this number. \n"
 								+ "\n"
 								+ THREAD_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				public static final ConfigEntry<Double> runTimeRatioForWorldGenerationThreads = new ConfigEntry.Builder<Double>()
+						.setServersideShortName("runTimeRatioForWorldGenerationThreads")
 						.setMinDefaultMax(0.01, ThreadPresetConfigEventHandler.getWorldGenDefaultRunTimeRatio(), 1.0)
 						.comment(THREAD_RUN_TIME_RATIO_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static final ConfigEntry<Integer> numberOfFileHandlerThreads = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("numberOfFileHandlerThreads")
 						.setMinDefaultMax(1,
 								ThreadPresetConfigEventHandler.getFileHandlerDefaultThreadCount(),
 								Runtime.getRuntime().availableProcessors())
@@ -1038,10 +1137,13 @@ public class Config
 								+ "quickly flying through existing LODs. \n"
 								+ "\n"
 								+ THREAD_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				public static final ConfigEntry<Double> runTimeRatioForFileHandlerThreads = new ConfigEntry.Builder<Double>()
+						.setServersideShortName("runTimeRatioForFileHandlerThreads")
 						.setMinDefaultMax(0.01, ThreadPresetConfigEventHandler.getFileHandlerDefaultRunTimeRatio(), 1.0)
 						.comment(THREAD_RUN_TIME_RATIO_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static final ConfigEntry<Integer> numberOfUpdatePropagatorThreads = new ConfigEntry.Builder<Integer>()
@@ -1070,6 +1172,7 @@ public class Config
 						.build();
 				
 				public static final ConfigEntry<Integer> numberOfLodBuilderThreads = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("numberOfLodBuilderThreads")
 						.setMinDefaultMax(1,
 								ThreadPresetConfigEventHandler.getLodBuilderDefaultThreadCount(),
 								Runtime.getRuntime().availableProcessors())
@@ -1080,12 +1183,16 @@ public class Config
 								+ "certain graphics settings are changed, and when moving around the world. \n"
 								+ "\n"
 								+ THREAD_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				public static final ConfigEntry<Double> runTimeRatioForLodBuilderThreads = new ConfigEntry.Builder<Double>()
+						.setServersideShortName("runTimeRatioForLodBuilderThreads")
 						.setMinDefaultMax(0.01, ThreadPresetConfigEventHandler.getLodBuilderDefaultRunTimeRatio(), 1.0)
 						.comment(THREAD_RUN_TIME_RATIO_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				public static final ConfigEntry<Boolean> enableLodBuilderThreadLimiting = new ConfigEntry.Builder<Boolean>()
+						.setServersideShortName("enableLodBuilderThreadLimiting")
 						.set(true)
 						.comment(""
 								+ "Should only be disabled if deadlock occurs and LODs refuse to update. \n"
@@ -1093,8 +1200,29 @@ public class Config
 								+ "\n"
 								+ "Note that if deadlock did occur restarting MC may be necessary to stop the locked threads. \n"
 								+ "")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
+				public static final ConfigEntry<Integer> numberOfNetworkCompressionThreads = new ConfigEntry.Builder<Integer>()
+						.setServersideShortName("numberOfNetworkCompressionThreads")
+						.setMinDefaultMax(1,
+								ThreadPresetConfigEventHandler.getNetworkCompressionDefaultThreadCount(),
+								Runtime.getRuntime().availableProcessors())
+						.comment(""
+								+ "How many threads should be used when (de)compressing LODs \n"
+								+ "that are received/sent over the network?\n"
+								+ "\n"
+								+ "This pool doesn't do anything in singleplayer or when connected \n"
+								+ "to a server that doesn't support DH networking. \n"
+								+ "\n"
+								+ THREAD_NOTE)
+						.setSide(EConfigEntryRelevantSide.BOTH)
+						.build();
+				public static final ConfigEntry<Double> runTimeRatioForNetworkCompressionThreads = new ConfigEntry.Builder<Double>()
+						.setServersideShortName("runTimeRatioForNetworkCompressionThreads")
+						.setMinDefaultMax(0.01, ThreadPresetConfigEventHandler.getNetworkCompressionDefaultRunTimeRatio(), 1.0)
+						.comment(THREAD_RUN_TIME_RATIO_NOTE)
+						.build();
 			}
 			
 			public static class AutoUpdater
@@ -1128,31 +1256,39 @@ public class Config
 				// TODO add change all option
 				// TODO default to error chat and info file
 				public static ConfigEntry<EDhApiLoggerMode> logWorldGenEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logWorldGenEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about the world generation process. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logWorldGenPerformance = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logWorldGenPerformance")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log performance about the world generation process. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logWorldGenLoadEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logWorldGenPerformance")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about the world generation process. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logLodBuilderEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logLodBuilderEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about the LOD generation process. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logRendererBufferEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
@@ -1170,24 +1306,30 @@ public class Config
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logFileReadWriteEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logFileReadWriteEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about file read/write operations. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logFileSubDimEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logFileSubDimEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about file sub-dimension operations. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				public static ConfigEntry<EDhApiLoggerMode> logNetworkEvent = new ConfigEntry.Builder<EDhApiLoggerMode>()
+						.setServersideShortName("logNetworkEvent")
 						.set(EDhApiLoggerMode.LOG_ERROR_TO_CHAT_AND_INFO_TO_FILE)
 						.comment(""
 								+ "If enabled, the mod will log information about network operations. \n"
 								+ "This can be useful for debugging.")
+						.setSide(EConfigEntryRelevantSide.BOTH)
 						.build();
 				
 				
@@ -1599,4 +1741,17 @@ public class Config
 		}
 	}
 	
+	private static String getDefaultLevelKeyPrefix()
+	{
+		IMinecraftSharedWrapper mcWrapper = SingletonInjector.INSTANCE.get(IMinecraftSharedWrapper.class);
+		if (!mcWrapper.isDedicatedServer() || mcWrapper.isWorldNew())
+		{
+			return "";
+		}
+		else
+		{
+			return "server" + ThreadLocalRandom.current().nextInt(1, 1000); 
+		}
+	}
+	
 }
@@ -19,7 +19,6 @@

 package com.seibel.distanthorizons.core.config.eventHandlers.presets;

-import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.config.ConfigBase;
 import com.seibel.distanthorizons.core.config.ConfigEntryWithPresetOptions;
 import com.seibel.distanthorizons.core.config.listeners.IConfigListener;
@@ -30,6 +29,7 @@ import com.seibel.distanthorizons.coreapi.interfaces.config.IConfigEntry;
 import com.seibel.distanthorizons.coreapi.util.StringUtil;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.Nullable;

 import java.util.*;

@@ -38,6 +38,7 @@ public abstract class AbstractPresetConfigEventHandler<TPresetEnum extends Enum<
 	private static final Logger LOGGER = LogManager.getLogger();
 	private static final long MS_DELAY_BEFORE_APPLYING_PRESET = 3_000;
 	
+	@Nullable
 	private static IConfigGui configGui = SingletonInjector.INSTANCE.get(IConfigGui.class);
 	private static boolean guiListenersAdded = false;
 	
@@ -57,7 +58,11 @@ public abstract class AbstractPresetConfigEventHandler<TPresetEnum extends Enum<
 	
 	public AbstractPresetConfigEventHandler()
 	{
-		configGui.addOnScreenChangeListener(() -> this.onConfigUiClosed());
+		// don't update the UI when running on a server
+		if (configGui != null) 
+		{
+			configGui.addOnScreenChangeListener(this::onConfigUiClosed);
+		}
 	}
 	
 	
@@ -33,6 +33,7 @@ import org.apache.logging.log4j.Logger;

 import java.util.*;

+@SuppressWarnings("FieldCanBeLocal")
 public class RenderQualityPresetConfigEventHandler extends AbstractPresetConfigEventHandler<EDhApiQualityPreset>
 {
 	public static final RenderQualityPresetConfigEventHandler INSTANCE = new RenderQualityPresetConfigEventHandler();
@@ -32,6 +32,7 @@ import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;

+@SuppressWarnings("FieldCanBeLocal")
 public class ThreadPresetConfigEventHandler extends AbstractPresetConfigEventHandler<EDhApiThreadPreset>
 {
 	public static final ThreadPresetConfigEventHandler INSTANCE = new ThreadPresetConfigEventHandler();
@@ -128,6 +129,28 @@ public class ThreadPresetConfigEventHandler extends AbstractPresetConfigEventHan
 			}});
 	
 	
+	public static int getNetworkCompressionDefaultThreadCount() { return getThreadCountByPercent(0.3); }
+	private final ConfigEntryWithPresetOptions<EDhApiThreadPreset, Integer> networkCompressionThreadCount = new ConfigEntryWithPresetOptions<>(Config.Client.Advanced.MultiThreading.numberOfNetworkCompressionThreads,
+			new HashMap<EDhApiThreadPreset, Integer>()
+			{{
+				this.put(EDhApiThreadPreset.MINIMAL_IMPACT, 1);
+				this.put(EDhApiThreadPreset.LOW_IMPACT, getNetworkCompressionDefaultThreadCount());
+				this.put(EDhApiThreadPreset.BALANCED, getThreadCountByPercent(0.4));
+				this.put(EDhApiThreadPreset.AGGRESSIVE, getThreadCountByPercent(0.6));
+				this.put(EDhApiThreadPreset.I_PAID_FOR_THE_WHOLE_CPU, getThreadCountByPercent(0.8));
+			}});
+	public static double getNetworkCompressionDefaultRunTimeRatio() { return 0.5; }
+	private final ConfigEntryWithPresetOptions<EDhApiThreadPreset, Double> networkCompressionRunTime = new ConfigEntryWithPresetOptions<>(Config.Client.Advanced.MultiThreading.runTimeRatioForNetworkCompressionThreads,
+			new HashMap<EDhApiThreadPreset, Double>()
+			{{
+				this.put(EDhApiThreadPreset.MINIMAL_IMPACT, 0.25);
+				this.put(EDhApiThreadPreset.LOW_IMPACT, getNetworkCompressionDefaultRunTimeRatio());
+				this.put(EDhApiThreadPreset.BALANCED, 0.75);
+				this.put(EDhApiThreadPreset.AGGRESSIVE, 1.0);
+				this.put(EDhApiThreadPreset.I_PAID_FOR_THE_WHOLE_CPU, 1.0);
+			}});
+	
+	
 	
 	//==============//
 	// constructors //
@@ -149,6 +172,9 @@ public class ThreadPresetConfigEventHandler extends AbstractPresetConfigEventHan
 		this.configList.add(this.lodBuilderThreadCount);
 		this.configList.add(this.lodBuilderRunTime);
 		
+		this.configList.add(this.networkCompressionThreadCount);
+		this.configList.add(this.networkCompressionRunTime);
+		
 		
 		for (ConfigEntryWithPresetOptions<EDhApiThreadPreset, ?> config : this.configList)
 		{
@@ -20,17 +20,20 @@
 package com.seibel.distanthorizons.core.config.file;

 import com.electronwill.nightconfig.core.file.CommentedFileConfig;
+import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryRelevantSide;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.config.ConfigBase;
 import com.seibel.distanthorizons.core.config.types.AbstractConfigType;
 import com.seibel.distanthorizons.core.config.types.ConfigEntry;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftSharedWrapper;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;

 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.concurrent.locks.ReentrantLock;

 /**
 * Handles reading and writing config files.
@@ -40,46 +43,64 @@ import java.nio.file.Path;
 */
 public class ConfigFileHandling
 {
+	private static final IMinecraftSharedWrapper MC_SHARED = SingletonInjector.INSTANCE.get(IMinecraftSharedWrapper.class);
+	
+	
 	public final ConfigBase configBase;
 	public final Path configPath;
 	
-	private final Logger LOGGER;
+	private final Logger logger;
 	
 	/** This is the object for night-config */
 	private final CommentedFileConfig nightConfig;
 	
+	/** prevents readers/writers from overlapping and causing the config file from being duplicated or corrupted */
+	private final ReentrantLock readWriteLock = new ReentrantLock();
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
 	public ConfigFileHandling(ConfigBase configBase, Path configPath)
 	{
-		this.LOGGER = LogManager.getLogger(this.getClass().getSimpleName() + ", " + configBase.modID);
+		this.logger = LogManager.getLogger(this.getClass().getSimpleName() + ", " + configBase.modID);
 		this.configBase = configBase;
 		this.configPath = configPath;
 		
 		this.nightConfig = CommentedFileConfig.builder(this.configPath.toFile()).build();
 	}
 	
+	
+	
+	
 	/** Saves the entire config to the file */
-	public void saveToFile()
-	{
-		saveToFile(this.nightConfig);
-	}
+	public void saveToFile() { this.saveToFile(this.nightConfig); }
 	/** Saves the entire config to the file */
 	public void saveToFile(CommentedFileConfig nightConfig)
 	{
-		if (!Files.exists(configPath)) // Try to check if the config exists
+		try
 		{
-			reCreateFile(configPath);
+			this.readWriteLock.lock();
+			
+			
+			
+			if (!Files.exists(this.configPath)) // Try to check if the config exists
+			{
+				reCreateFile(this.configPath);
 			}
 			
 			
-		loadNightConfig(nightConfig);
+			this.loadNightConfig(nightConfig);
 			
 			
 			for (AbstractConfigType<?, ?> entry : this.configBase.entries)
 			{
 				if (ConfigEntry.class.isAssignableFrom(entry.getClass()))
 				{
-				createComment((ConfigEntry<?>) entry, nightConfig);
-				saveEntry((ConfigEntry<?>) entry, nightConfig);
+					this.createComment((ConfigEntry<?>) entry, nightConfig);
+					this.saveEntry((ConfigEntry<?>) entry, nightConfig);
 				}
 			}
 			
@@ -91,7 +112,13 @@ public class ConfigFileHandling
 			catch (Exception e)
 			{
 				// If it fails to save, crash game
-			SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class).crashMinecraft("Failed to save config at [" + configPath.toString() + "]", e);
+				SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class).crashMinecraft("Failed to save config at [" + this.configPath + "]", e);
+			}
+			
+		}
+		finally
+		{
+			this.readWriteLock.unlock();
 		}
 	}
 	
@@ -102,7 +129,11 @@ public class ConfigFileHandling
 	 */
 	public void loadFromFile()
 	{
-		int currentCfgVersion = configBase.configVersion;
+		try
+		{
+			this.readWriteLock.lock();
+			
+			int currentCfgVersion = this.configBase.configVersion;
 			try
 			{
 				// Dont load the real `this.nightConfig`, instead create a tempoary one
@@ -111,58 +142,64 @@ public class ConfigFileHandling
 				// Attempt to get the version number
 				currentCfgVersion = (Integer) tmpNightConfig.get("_version");
 				tmpNightConfig.close();
-		} catch (Exception ignored) { }
+			}
+			catch (Exception ignored) { }
 			
-		if (currentCfgVersion == configBase.configVersion)
-		{}
-		else if (currentCfgVersion > configBase.configVersion)
+			if (currentCfgVersion == this.configBase.configVersion)
 			{
-			LOGGER.warn("Found config version [" + String.valueOf(currentCfgVersion) + "] which is newer than current mods config version of [" + String.valueOf(configBase.configVersion) + "]. You may have downgraded the mod and items may have been moved, you have been warned");
+				// handle normally
+			}
+			else if (currentCfgVersion > this.configBase.configVersion)
+			{
+				this.logger.warn("Found config version [" + currentCfgVersion + "] which is newer than current mods config version of [" + this.configBase.configVersion + "]. You may have downgraded the mod and items may have been moved, you have been warned");
 			}
 			else // if (currentCfgVersion < configBase.configVersion)
 			{
-			LOGGER.warn(configBase.modName +" config is of an older version, currently there is no config updater... so resetting config");
+				this.logger.warn(this.configBase.modName + " config is of an older version, currently there is no config updater... so resetting config");
 				try
 				{
-				Files.delete(configPath);
+					Files.delete(this.configPath);
 				}
 				catch (Exception e)
 				{
-				LOGGER.error(e);
+					this.logger.error(e);
 				}
 			}
 			
-		loadFromFile(nightConfig);
-		nightConfig.set("_version", configBase.configVersion);
+			this.loadFromFile(this.nightConfig);
+			this.nightConfig.set("_version", this.configBase.configVersion);
+		}
+		finally
+		{
+			this.readWriteLock.unlock();
+		}
 	}
 	/**
 	 * Loads the entire config from the file
 	 *
 	 * @apiNote This overwrites any value currently stored in the config
 	 */
-	public void loadFromFile(CommentedFileConfig nightConfig)
+	private void loadFromFile(CommentedFileConfig nightConfig)
 	{
 		// Attempt to load the file and if it fails then save config to file
-		if (Files.exists(configPath))
+		if (Files.exists(this.configPath))
 		{
-			loadNightConfig(nightConfig);
+			this.loadNightConfig(nightConfig);
 		}
 		else
 		{
-			reCreateFile(configPath);
+			reCreateFile(this.configPath);
 		}
 		
 		
 		// Load all the entries
 		for (AbstractConfigType<?, ?> entry : this.configBase.entries)
 		{
-			if (
-					ConfigEntry.class.isAssignableFrom(entry.getClass()) &&
-					entry.getAppearance().showInFile
-			)
+			if (ConfigEntry.class.isAssignableFrom(entry.getClass())
+				&& entry.getAppearance().showInFile)
 			{
-				createComment((ConfigEntry<?>) entry, nightConfig);
-				loadEntry((ConfigEntry<?>) entry, nightConfig);
+				this.createComment((ConfigEntry<?>) entry, nightConfig);
+				this.loadEntry((ConfigEntry<?>) entry, nightConfig);
 			}
 		}
 		
@@ -174,7 +211,7 @@ public class ConfigFileHandling
 		catch (Exception e)
 		{
 			// If it fails to save, crash game
-			SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class).crashMinecraft("Failed to save config at [" + configPath.toString() + "]", e);
+			SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class).crashMinecraft("Failed to save config at [" + this.configPath + "]", e);
 		}
 	}
 	
@@ -184,24 +221,34 @@ public class ConfigFileHandling
 	// Save an entry when only given the entry
 	public void saveEntry(ConfigEntry<?> entry)
 	{
-		saveEntry(entry, nightConfig);
-		nightConfig.save();
+		this.saveEntry(entry, this.nightConfig);
+		this.nightConfig.save();
 	}
 	/** Save an entry */
 	public void saveEntry(ConfigEntry<?> entry, CommentedFileConfig workConfig)
 	{
-		if (!entry.getAppearance().showInFile) return;
-		if (entry.getTrueValue() == null)
-			throw new IllegalArgumentException("Entry [" + entry.getNameWCategory() + "] is null, this may be a problem with [" + configBase.modName + "]. Please contact the authors");
+		if (!entry.getAppearance().showInFile)
+		{
+			return;
+		}
+		else if ((entry.getRelevantSide() == EConfigEntryRelevantSide.CLIENT && MC_SHARED.isDedicatedServer())
+				|| (entry.getRelevantSide() == EConfigEntryRelevantSide.SERVER && !MC_SHARED.isDedicatedServer()))
+		{
+			// don't save server/client specific configs on the opposite
+			// (this keeps the config file clean of unnecessary items)
+			return;
+		}
+		else if (entry.getTrueValue() == null)
+		{
+			// TODO when can this happen?
+			throw new IllegalArgumentException("Entry [" + entry.getNameWCategory() + "] is null, this may be a problem with [" + this.configBase.modName + "]. Please contact the authors.");
+		}
 		
 		workConfig.set(entry.getNameWCategory(), ConfigTypeConverters.attemptToConvertToString(entry.getType(), entry.getTrueValue()));
 	}
 	
 	/** Loads an entry when only given the entry */
-	public void loadEntry(ConfigEntry<?> entry)
-	{
-		loadEntry(entry, nightConfig);
-	}
+	public void loadEntry(ConfigEntry<?> entry) { this.loadEntry(entry, this.nightConfig); }
 	/** Loads an entry */
 	@SuppressWarnings("unchecked")
 	public <T> void loadEntry(ConfigEntry<T> entry, CommentedFileConfig nightConfig)
@@ -211,7 +258,7 @@ public class ConfigFileHandling
 		
 		if (!nightConfig.contains(entry.getNameWCategory()))
 		{
-			saveEntry(entry, nightConfig);
+			this.saveEntry(entry, nightConfig);
 			return;
 		}
 		
@@ -230,7 +277,7 @@ public class ConfigFileHandling
 			Object convertedValue = ConfigTypeConverters.attemptToConvertFromString(expectedValueClass, value);
 			if (!convertedValue.getClass().equals(expectedValueClass))
 			{
-				LOGGER.error("Unable to convert config value ["+value+"] from ["+(value != null ? value.getClass() : "NULL")+"] to ["+expectedValueClass+"] for config ["+entry.name+"], " +
+				this.logger.error("Unable to convert config value ["+value+"] from ["+(value != null ? value.getClass() : "NULL")+"] to ["+expectedValueClass+"] for config ["+entry.name+"], " +
 						"the default config value will be used instead ["+entry.getDefaultValue()+"]. " +
 						"Make sure a converter is defined in ["+ConfigTypeConverters.class.getSimpleName()+"].");
 				convertedValue = entry.getDefaultValue();
@@ -239,31 +286,39 @@ public class ConfigFileHandling
 			
 			if (entry.getTrueValue() == null) 
 			{
-				LOGGER.warn("Entry [" + entry.getNameWCategory() + "] returned as null from the config. Using default value.");
+				this.logger.warn("Entry [" + entry.getNameWCategory() + "] returned as null from the config. Using default value.");
 				entry.pureSet(entry.getDefaultValue());
 			}
 		}
 		catch (Exception e)
 		{
 //                e.printStackTrace();
-			LOGGER.warn("Entry [" + entry.getNameWCategory() + "] had an invalid value when loading the config. Using default value.");
+			this.logger.warn("Entry [" + entry.getNameWCategory() + "] had an invalid value when loading the config. Using default value.");
 			entry.pureSet(entry.getDefaultValue());
 		}
 	}
 	
 	// Creates the comment for an entry when only given the entry
-	public void createComment(ConfigEntry<?> entry)
-	{
-		createComment(entry, nightConfig);
-	}
+	public void createComment(ConfigEntry<?> entry) { this.createComment(entry, this.nightConfig); }
 	// Creates a comment for an entry
 	public void createComment(ConfigEntry<?> entry, CommentedFileConfig nightConfig)
 	{
-		if (
-				!entry.getAppearance().showInFile || 
-				entry.getComment() == null
-		)
+		if (!entry.getAppearance().showInFile 
+			|| entry.getComment() == null)
+		{
 			return;
+		}
+		
+		
+		
+		if ((entry.getRelevantSide() == EConfigEntryRelevantSide.CLIENT && MC_SHARED.isDedicatedServer())
+				|| (entry.getRelevantSide() == EConfigEntryRelevantSide.SERVER && !MC_SHARED.isDedicatedServer()))
+		{
+			// don't save server/client specific configs on the opposite
+			// (this keeps the config file clean of unnecessary items)
+			return;
+		}
+		
 		
 		String comment = entry.getComment().replaceAll("\n", "\n ").trim();
 		// the new line makes it easier to read and separate configs
@@ -302,7 +357,7 @@ public class ConfigFileHandling
 			}
 			catch (Exception e)
 			{
-				LOGGER.warn("Loading file failed because of this expectation:\n" + e);
+				this.logger.warn("Loading file failed because of this expectation:\n" + e);
 				
 				reCreateFile(this.configPath);
 				
@@ -312,7 +367,7 @@ public class ConfigFileHandling
 		catch (Exception ex)
 		{
 			System.out.println("Creating file failed");
-			LOGGER.error(ex);
+			this.logger.error(ex);
 			SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class).crashMinecraft("Loading file and resetting config file failed at path [" + configPath + "]. Please check the file is ok and you have the permissions", ex);
 		}
 	}
@@ -25,6 +25,7 @@ import com.seibel.distanthorizons.core.config.listeners.ConfigChangeListener;
 import com.seibel.distanthorizons.core.config.listeners.IConfigListener;
 import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryAppearance;
 import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryPerformance;
+import com.seibel.distanthorizons.core.config.types.enums.EConfigEntryRelevantSide;
 import com.seibel.distanthorizons.coreapi.interfaces.config.IConfigEntry;

 import java.util.ArrayList;
@@ -44,6 +45,10 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	private T min;
 	private T max;
 	private final ArrayList<IConfigListener> listenerList;
+	private final String serversideShortName;
+	
+	private final EConfigEntryPerformance performance;
+	private final EConfigEntryRelevantSide relevantSide;
 	
 	// API control //
 	/**
@@ -53,19 +58,25 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	public final boolean allowApiOverride;
 	private T apiValue;
 	
-	private final EConfigEntryPerformance performance;
 	
 	
 	/** Creates the entry */
-	private ConfigEntry(EConfigEntryAppearance appearance, T value, String comment, T min, T max, boolean allowApiOverride, EConfigEntryPerformance performance, ArrayList<IConfigListener> listenerList)
+	private ConfigEntry(
+			EConfigEntryAppearance appearance, 
+			T value, String comment, T min, T max, 
+			String serversideShortName, boolean allowApiOverride, 
+			EConfigEntryPerformance performance, EConfigEntryRelevantSide relevantSide, 
+			ArrayList<IConfigListener> listenerList)
 	{
 		super(appearance, value);
 		
 		this.comment = comment;
 		this.min = min;
 		this.max = max;
+		this.serversideShortName = serversideShortName;
 		this.allowApiOverride = allowApiOverride;
 		this.performance = performance;
+		this.relevantSide = relevantSide;
 		this.listenerList = listenerList;
 	}
 	
@@ -179,6 +190,9 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 		if (validness == 1) this.value = (T) NumberUtil.getMaximum(this.value.getClass());
 	}
 	
+	// TODO is this for command line use?
+	public String getServersideShortName() { return this.serversideShortName; }
+	
 	@Override
 	public String getComment() { return this.comment; }
 	@Override
@@ -186,6 +200,8 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 	
 	/** Gets the performance impact of an option */
 	public EConfigEntryPerformance getPerformance() { return this.performance; }
+	/** Gets whether this config should apply to the client, server, or both */
+	public EConfigEntryRelevantSide getRelevantSide() { return this.relevantSide; }
 	
 	/** Fired whenever the config value changes to a new value. */
 	public void addValueChangeListener(Consumer<T> onValueChangeFunc)
@@ -315,8 +331,10 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 		private String tmpComment = null;
 		private T tmpMin = null;
 		private T tmpMax = null;
+		protected String tmpServersideShortName = null;
 		private boolean tmpUseApiOverwrite = true;
 		private EConfigEntryPerformance tmpPerformance = EConfigEntryPerformance.DONT_SHOW;
+		private EConfigEntryRelevantSide tmpRelevantSide = EConfigEntryRelevantSide.CLIENT;
 		protected ArrayList<IConfigListener> tmpIConfigListener = new ArrayList<>();
 		
 		public Builder<T> comment(String newComment)
@@ -352,6 +370,12 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 			return this;
 		}
 		
+		public Builder<T> setServersideShortName(String name)
+		{
+			this.tmpServersideShortName = name;
+			return this;
+		}
+		
 		public Builder<T> setUseApiOverwrite(boolean newUseApiOverwrite)
 		{
 			this.tmpUseApiOverwrite = newUseApiOverwrite;
@@ -364,6 +388,12 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 			return this;
 		}
 		
+		public Builder<T> setSide(EConfigEntryRelevantSide relevantSide)
+		{
+			this.tmpRelevantSide = relevantSide;
+			return this;
+		}
+		
 		
 		
 		public Builder<T> replaceListeners(ArrayList<IConfigListener> newConfigListener)
@@ -394,7 +424,11 @@ public class ConfigEntry<T> extends AbstractConfigType<T, ConfigEntry<T>> implem
 		
 		public ConfigEntry<T> build()
 		{
-			return new ConfigEntry<>(this.tmpAppearance, this.tmpValue, this.tmpComment, this.tmpMin, this.tmpMax, this.tmpUseApiOverwrite, this.tmpPerformance, this.tmpIConfigListener);
+			return new ConfigEntry<>(
+					this.tmpAppearance, 
+					this.tmpValue, this.tmpComment, this.tmpMin, this.tmpMax, 
+					this.tmpServersideShortName, this.tmpUseApiOverwrite, 
+					this.tmpPerformance, this.tmpRelevantSide, this.tmpIConfigListener);
 		}
 		
 	}
@@ -17,14 +17,20 @@
 *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

-package com.seibel.distanthorizons.core.network.protocol;
+package com.seibel.distanthorizons.core.config.types.enums;

 /**
- * CLIENT, <br>
+ * BOTH,    <br>
 * SERVER,  <br>
+ * CLIENT,  <br>
+ * 
+ * Defines whether this config entry is for the client, server, or both.
+ * TODO this needs a better name.
 */
-public enum EMessageHandlerSide
+public enum EConfigEntryRelevantSide
 {
+	BOTH,
+	SERVER,
 	CLIENT,
-	SERVER
+	
 }
@@ -90,11 +90,13 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 	
 	/** 
 	 * stores how far each column has been generated should start with {@link EDhApiWorldGenerationStep#EMPTY}
+	 *
 	 * @see EDhApiWorldGenerationStep
 	 */
 	public byte[] columnGenerationSteps;
 	/** 
 	 * stores what world compression was used for each column.
+	 *
 	 * @see EDhApiWorldCompressionMode
 	 */
 	public byte[] columnWorldCompressionMode;
@@ -144,7 +146,7 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 		this.columnWorldCompressionMode = columnWorldCompressionMode;
 	}
 	
-	public static FullDataSourceV2 createFromChunk(IChunkWrapper chunkWrapper) { return LodDataBuilder.createGeneratedDataSource(chunkWrapper); }
+	public static FullDataSourceV2 createFromChunk(IChunkWrapper chunkWrapper) { return LodDataBuilder.createFromChunk(chunkWrapper); }
 	
 	public static FullDataSourceV2 createFromLegacyDataSourceV1(FullDataSourceV1 legacyData)
 	{
@@ -719,27 +721,43 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 			}
 			
 			if (value == value0)
+			{
 				count0++;
+			}
 			else if (value == value1)
+			{
 				count1++;
+			}
 			else if (value == value2)
+			{
 				count2++;
+			}
 			else
+			{
 				count3++;
 			}
+		}
 		
 		// return the most common occurance
 		int maxCount = Math.max(count0, Math.max(count1, Math.max(count2, count3)));
 		if (maxCount == count0)
 		// if the max count is 1 then we'll just go with the first column
+		{
 			return value0;
+		}
 		else if (maxCount == count1)
+		{
 			return value1;
+		}
 		else if (maxCount == count2)
+		{
 			return value2;
+		}
 		else
+		{
 			return value3;
 		}
+	}
 	private static int determineAverageValueInColumnSlice(int[] sliceArray)
 	{
 		if (RUN_UPDATE_DEV_VALIDATION)
@@ -905,6 +923,7 @@ public class FullDataSourceV2 implements IDataSource<IDhLevel>
 	@Override
 	public String toString() { return DhSectionPos.toString(this.pos); }
 	
+	/** Only includes the base data in this object, not the mapping */
 	@Override 
 	public int hashCode()
 	{
@@ -111,7 +111,7 @@ public class ColumnRenderBufferBuilder
 	/** @link adjData should be null for adjacent sections that cross detail level boundaries */
 	public static CompletableFuture<ColumnRenderBuffer> uploadBuffersAsync(
 			IDhClientLevel clientLevel,
-			ColumnRenderSource renderSource,
+			long pos,
 			LodQuadBuilder quadBuilder
 		)
 	{
@@ -132,7 +132,7 @@ public class ColumnRenderBufferBuilder
 				{
 					try
 					{
-						ColumnRenderBuffer buffer = new ColumnRenderBuffer(new DhBlockPos(DhSectionPos.getMinCornerBlockX(renderSource.pos), clientLevel.getMinY(), DhSectionPos.getMinCornerBlockZ(renderSource.pos)));
+						ColumnRenderBuffer buffer = new ColumnRenderBuffer(new DhBlockPos(DhSectionPos.getMinCornerBlockX(pos), clientLevel.getMinY(), DhSectionPos.getMinCornerBlockZ(pos)));
 						try
 						{
 							buffer.uploadBuffer(quadBuilder, GLProxy.getInstance().getGpuUploadMethod());
@@ -158,7 +158,7 @@ public class ColumnRenderBufferBuilder
 					}
 					catch (Throwable e3)
 					{
-						LOGGER.error("LodNodeBufferBuilder was unable to upload buffer for pos ["+DhSectionPos.toString(renderSource.pos)+"], error: [" + e3.getMessage() + "].", e3);
+						LOGGER.error("LodNodeBufferBuilder was unable to upload buffer for pos ["+DhSectionPos.toString(pos)+"], error: [" + e3.getMessage() + "].", e3);
 						throw e3;
 					}
 				}, bufferUploaderExecutor);
@@ -229,7 +229,7 @@ public class FullDataToRenderDataTransformer
 				if (!brokenPos.contains(fullDataMapping.getPos()))
 				{
 					brokenPos.add(fullDataMapping.getPos());
-					String dimName = level.getLevelWrapper().getDimensionType().getDimensionName();
+					String dimName = level.getLevelWrapper().getDimensionName();
 					LOGGER.warn("Unable to get data point with id ["+id+"] " +
 							"(Max possible ID: ["+fullDataMapping.getMaxValidId()+"]) " +
 							"for pos ["+fullDataMapping.getPos()+"] in dimension ["+dimName+"]. " +
@@ -40,6 +40,7 @@ import com.seibel.distanthorizons.core.util.RenderDataPointUtil;
 import com.seibel.distanthorizons.core.util.objects.DataCorruptedException;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IMutableBlockPosWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IBiomeWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.IWrapperFactory;
 import it.unimi.dsi.fastutil.longs.LongArrayList;
@@ -58,12 +59,10 @@ public class LodDataBuilder
 	// converters //
 	//============//
 	
-	public static FullDataSourceV2 createGeneratedDataSource(IChunkWrapper chunkWrapper)
+	public static FullDataSourceV2 createFromChunk(IChunkWrapper chunkWrapper)
 	{
-		if (!canGenerateLodFromChunk(chunkWrapper))
-		{
-			return null;
-		}
+		// only block lighting is needed here, sky lighting is populated at the data source stage
+		LodUtil.assertTrue(chunkWrapper.isDhBlockLightingCorrect());
 		
 		
 		
@@ -132,6 +131,9 @@ public class LodDataBuilder
 		
 		try
 		{
+			IMutableBlockPosWrapper mcBlockPos = chunkWrapper.getMutableBlockPosWrapper();
+			IBlockStateWrapper previousBlockState = null;
+			
 			int minBuildHeight = chunkWrapper.getMinNonEmptyHeight();
 			for (int relBlockX = 0; relBlockX < LodUtil.CHUNK_WIDTH; relBlockX++)
 			{
@@ -149,8 +151,8 @@ public class LodDataBuilder
 					if (lastY < chunkWrapper.getMaxBuildHeight())
 					{
 						// FIXME: The lastY +1 offset is to reproduce the old behavior. Remove this when we get per-face lighting
-						blockLight = (byte) chunkWrapper.getBlockLight(relBlockX, lastY + 1, relBlockZ);
-						skyLight = (byte) chunkWrapper.getSkyLight(relBlockX, lastY + 1, relBlockZ);
+						blockLight = (byte) chunkWrapper.getDhBlockLight(relBlockX, lastY + 1, relBlockZ);
+						skyLight = (byte) chunkWrapper.getDhSkyLight(relBlockX, lastY + 1, relBlockZ);
 					}
 					else
 					{
@@ -163,7 +165,7 @@ public class LodDataBuilder
 					// determine the starting Y Pos
 					int y = chunkWrapper.getLightBlockingHeightMapValue(relBlockX, relBlockZ);
 					// go up until we reach open air or the world limit
-					IBlockStateWrapper topBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ);
+					IBlockStateWrapper topBlockState = previousBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ, mcBlockPos, previousBlockState);
 					while (!topBlockState.isAir() && y < chunkWrapper.getMaxBuildHeight())
 					{
 						try
@@ -171,7 +173,7 @@ public class LodDataBuilder
 							// This is necessary in some edge cases with snow layers and some other blocks that may not appear in the height map but do block light.
 							// Interestingly this doesn't appear to be the case in the DhLightingEngine, if this same logic is added there the lighting breaks for the affected blocks.
 							y++;
-							topBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ);
+							topBlockState = previousBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ, mcBlockPos, previousBlockState);
 						}
 						catch (Exception e)
 						{
@@ -190,9 +192,9 @@ public class LodDataBuilder
 					for (; y >= minBuildHeight; y--)
 					{
 						IBiomeWrapper newBiome = chunkWrapper.getBiome(relBlockX, y, relBlockZ);
-						IBlockStateWrapper newBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ);
-						byte newBlockLight = (byte) chunkWrapper.getBlockLight(relBlockX, y + 1, relBlockZ);
-						byte newSkyLight = (byte) chunkWrapper.getSkyLight(relBlockX, y + 1, relBlockZ);
+						IBlockStateWrapper newBlockState = previousBlockState = chunkWrapper.getBlockState(relBlockX, y, relBlockZ, mcBlockPos, previousBlockState);
+						byte newBlockLight = (byte) chunkWrapper.getDhBlockLight(relBlockX, y + 1, relBlockZ);
+						byte newSkyLight = (byte) chunkWrapper.getDhSkyLight(relBlockX, y + 1, relBlockZ);
 						
 						// save the biome/block change
 						if (!newBiome.equals(biome) || !newBlockState.equals(blockState))
@@ -435,8 +437,6 @@ public class LodDataBuilder
 	// helper methods //
 	//================//
 	
-	public static boolean canGenerateLodFromChunk(IChunkWrapper chunk) { return chunk != null && chunk.isLightCorrect(); }
-	
 	public static int getXOrZSectionPosFromChunkPos(int chunkXOrZPos)
 	{
 		// get the section position
@@ -46,7 +46,7 @@ public abstract class AbstractDataSourceHandler
 	 * The lowest numerical detail level possible. 
 	 *
 	 * @see AbstractDataSourceHandler#TOP_SECTION_DETAIL_LEVEL
-	 * */
+	 */
 	public static final byte MIN_SECTION_DETAIL_LEVEL = DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL;
 	
 	
@@ -223,6 +223,7 @@ public abstract class AbstractDataSourceHandler
 	
 	/** 
 	 * After this method returns the inputData will be written to file.
+	 *
 	 * @param updatePos the position to update
 	 */
 	protected void updateDataSourceAtPos(long updatePos, @NotNull FullDataSourceV2 inputData, boolean lockOnUpdatePos)
@@ -6,6 +6,7 @@ import com.seibel.distanthorizons.core.level.IDhLevel;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV1DTO;
+import com.seibel.distanthorizons.core.sql.repo.AbstractDhRepo;
 import com.seibel.distanthorizons.core.sql.repo.FullDataSourceV1Repo;
 import com.seibel.distanthorizons.core.util.objects.DataCorruptedException;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
@@ -64,7 +65,7 @@ public class FullDataSourceProviderV1<TDhLevel extends IDhLevel>
 	{
 		try
 		{
-			return new FullDataSourceV1Repo("jdbc:sqlite", new File(this.saveDir.getPath() + File.separator + AbstractSaveStructure.DATABASE_NAME));
+			return new FullDataSourceV1Repo(AbstractDhRepo.DEFAULT_DATABASE_TYPE, new File(this.saveDir.getPath() + File.separator + AbstractSaveStructure.DATABASE_NAME));
 		}
 		catch (SQLException e)
 		{
@@ -21,6 +21,7 @@ package com.seibel.distanthorizons.core.file.fullDatafile;

 import com.seibel.distanthorizons.api.enums.config.EDhApiDataCompressionMode;
 import com.seibel.distanthorizons.core.api.internal.ClientApi;
+import com.seibel.distanthorizons.core.api.internal.SharedApi;
 import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV1;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
@@ -33,10 +34,12 @@ import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
 import com.seibel.distanthorizons.core.render.renderer.IDebugRenderable;
 import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
+import com.seibel.distanthorizons.core.sql.repo.AbstractDhRepo;
 import com.seibel.distanthorizons.core.sql.repo.FullDataSourceV2Repo;
 import com.seibel.distanthorizons.core.util.ThreadUtil;
 import com.seibel.distanthorizons.core.util.objects.DataCorruptedException;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
+import com.seibel.distanthorizons.core.world.EWorldEnvironment;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import it.unimi.dsi.fastutil.longs.LongArrayList;
 import org.apache.logging.log4j.Logger;
@@ -102,9 +105,14 @@ public class FullDataSourceProviderV2
 	
 	// TODO only run thread if modifications happened recently
 	/** 
-	 * This isn't in {@link AbstractDataSourceHandler} since we don't need parent updating logic
-	 * for render data, only full data.
+	 * This isn't in {@link AbstractDataSourceHandler} since we only want to update
+	 * the newest version of the full data, so if we have providers for either
+	 * render data or old full data, we don't want to update them. <br><br>
+	 * 
+	 * Will be null on the dedicated server since updates don't need to be propagated,
+	 * only the highest detail level is needed.
 	 */
+	@Nullable
 	private final ThreadPoolExecutor updateQueueProcessor;
 	
 	
@@ -121,14 +129,22 @@ public class FullDataSourceProviderV2
 		
 		DebugRenderer.register(this, Config.Client.Advanced.Debugging.DebugWireframe.showFullDataUpdateStatus);
 		
-		String dimensionName = level.getLevelWrapper().getDimensionType().getDimensionName();
+		String dimensionName = level.getLevelWrapper().getDimensionName();
 		
 		// start migrating any legacy data sources present in the background
 		this.migrationThreadPool = ThreadUtil.makeRateLimitedThreadPool(1, MIGRATION_THREAD_NAME_PREFIX + "["+dimensionName+"]", Config.Client.Advanced.MultiThreading.runTimeRatioForUpdatePropagatorThreads.get(), Thread.MIN_PRIORITY, (Semaphore) null);
-		this.migrationThreadPool.execute(() -> this.convertLegacyDataSources());
+		this.migrationThreadPool.execute(this::convertLegacyDataSources);
 		
+		// update propagation doesn't need to be run on the server since only the highest detail level is needed
+		if (SharedApi.getEnvironment() != EWorldEnvironment.Server_Only)
+		{
 			this.updateQueueProcessor = ThreadUtil.makeSingleThreadPool("Parent Update Queue ["+dimensionName+"]");
-		this.updateQueueProcessor.execute(() -> this.runUpdateQueue());
+			this.updateQueueProcessor.execute(this::runUpdateQueue);
+		}
+		else
+		{
+			this.updateQueueProcessor = null;
+		}
 	}
 	
 	
@@ -142,7 +158,7 @@ public class FullDataSourceProviderV2
 	{
 		try
 		{
-			return new FullDataSourceV2Repo("jdbc:sqlite", new File(this.saveDir.getPath() + File.separator + AbstractSaveStructure.DATABASE_NAME));
+			return new FullDataSourceV2Repo(AbstractDhRepo.DEFAULT_DATABASE_TYPE, new File(this.saveDir.getPath() + File.separator + AbstractSaveStructure.DATABASE_NAME));
 		}
 		catch (SQLException e)
 		{
@@ -289,7 +305,8 @@ public class FullDataSourceProviderV2
 								}
 							});
 						}
-						catch (RejectedExecutionException ignore) { /* the executor was shut down, it should be back up shortly and able to accept new jobs */ }
+						catch (RejectedExecutionException ignore)
+						{ /* the executor was shut down, it should be back up shortly and able to accept new jobs */ }
 						catch (Exception e)
 						{
 							this.parentUpdatingPosSet.remove(parentUpdatePos);
@@ -299,7 +316,10 @@ public class FullDataSourceProviderV2
 				}
 				
 			}
-			catch (InterruptedException ignored) { Thread.currentThread().interrupt(); }
+			catch (InterruptedException ignored)
+			{
+				Thread.currentThread().interrupt();
+			}
 			catch (Exception e)
 			{
 				LOGGER.error("Unexpected error in the parent update queue thread. Error: " + e.getMessage(), e);
@@ -317,7 +337,7 @@ public class FullDataSourceProviderV2
 	
 	private void convertLegacyDataSources()
 	{
-		String dimensionName = this.level.getLevelWrapper().getDimensionType().getDimensionName();
+		String dimensionName = this.level.getLevelWrapper().getDimensionName();
 		LOGGER.info("Attempting to migrate data sources for: ["+dimensionName+"]-["+this.saveDir+"]...");
 		
 		
@@ -368,8 +388,8 @@ public class FullDataSourceProviderV2
 				}
 				catch (InterruptedException ignore){}
 			}
-
 			LOGGER.info("Done deleting [" + dimensionName + "] - ["+totalDeleteCount+"] unused data sources.");
+			
 		}
 		
 		
@@ -420,9 +440,7 @@ public class FullDataSourceProviderV2
 								{
 									newDataSource.close();
 								}
-								catch (Exception ignore)
-								{
-								}
+								catch (Exception ignore) { }
 							});
 						}
 						catch (Exception e)
@@ -498,7 +516,7 @@ public class FullDataSourceProviderV2
 		}
 		this.migrationStartMessageQueued = true;
 		
-		String dimName = this.level.getLevelWrapper().getDimensionType().getDimensionName();
+		String dimName = this.level.getLevelWrapper().getDimensionName();
 		ClientApi.INSTANCE.showChatMessageNextFrame(
 				"Old Distant Horizons data is being migrated for ["+dimName+"]. \n" +
 				"While migrating LODs may load slowly \n" +
@@ -509,7 +527,7 @@ public class FullDataSourceProviderV2
 	
 	private void showMigrationEndMessage(boolean success)
 	{
-		String dimName = this.level.getLevelWrapper().getDimensionType().getDimensionName();
+		String dimName = this.level.getLevelWrapper().getDimensionName();
 		
 		if (success)
 		{
@@ -594,6 +612,20 @@ public class FullDataSourceProviderV2
 	 */
 	public int getUnsavedDataSourceCount() { return -1; }
 	
+	public boolean fileExists(long pos) { return this.repo.getDataSizeInBytes(pos) > 0; }
+	
+	
+	
+	//========================//
+	// multiplayer networking //
+	//========================//
+	
+	@Nullable
+	public Long getTimestampForPos(long pos)
+	{ return this.repo.getTimestampForPos(pos); }
+	public Map<Long, Long> getTimestampsForRange(byte detailLevel, int startPosX, int startPosZ, int endPosX, int endPosZ)
+	{ return this.repo.getTimestampsForRange(detailLevel, startPosX, startPosZ, endPosX, endPosZ); }
+	
 	
 	
 	//===========//
@@ -616,7 +648,10 @@ public class FullDataSourceProviderV2
 	public void close()
 	{
 		super.close();
+		if (this.updateQueueProcessor != null)
+		{
 			this.updateQueueProcessor.shutdownNow();
+		}
 		
 		this.legacyFileHandler.close();
 		
@@ -23,12 +23,15 @@ import com.seibel.distanthorizons.api.enums.worldGeneration.EDhApiWorldGeneratio
 import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
+import com.seibel.distanthorizons.core.generation.DhLightingEngine;
 import com.seibel.distanthorizons.core.generation.IFullDataSourceRetrievalQueue;
 import com.seibel.distanthorizons.core.generation.tasks.IWorldGenTaskTracker;
 import com.seibel.distanthorizons.core.generation.tasks.WorldGenResult;
 import com.seibel.distanthorizons.core.level.IDhLevel;
+import com.seibel.distanthorizons.core.level.WorldGenModule;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
 import com.seibel.distanthorizons.core.render.renderer.IDebugRenderable;
 import com.seibel.distanthorizons.core.util.LodUtil;
@@ -36,12 +39,15 @@ import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
 import com.seibel.distanthorizons.coreapi.util.BitShiftUtil;
 import it.unimi.dsi.fastutil.longs.LongArrayList;
 import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.Nullable;

 import java.awt.*;
+import java.io.File;
 import java.util.*;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
+import java.util.stream.IntStream;

 public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 implements IDebugRenderable
 {
@@ -70,6 +76,7 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 	//=============//
 	
 	public GeneratedFullDataSourceProvider(IDhLevel level, AbstractSaveStructure saveStructure) { super(level, saveStructure); }
+	public GeneratedFullDataSourceProvider(IDhLevel level, AbstractSaveStructure saveStructure, @Nullable File saveDirOverride) { super(level, saveStructure, saveDirOverride); }
 	
 	
 	
@@ -139,7 +146,7 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 	{
 		boolean oldQueueExists = this.worldGenQueueRef.compareAndSet(null, newWorldGenQueue);
 		LodUtil.assertTrue(oldQueueExists, "previous world gen queue is still here!");
-		LOGGER.info("Set world gen queue for level ["+this.level+"].");
+		LOGGER.info("Set world gen queue for level [" + this.level.getLevelWrapper().getDimensionName() + "].");
 	}
 	
 	@Override
@@ -214,7 +221,7 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 		}
 		
 		GenTask genTask = new GenTask(genPos);
-		CompletableFuture<WorldGenResult> worldGenFuture = worldGenQueue.submitGenTask(genPos, (byte) (DhSectionPos.getDetailLevel(genPos) - DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL), genTask);
+		CompletableFuture<WorldGenResult> worldGenFuture = worldGenQueue.submitRetrievalTask(genPos, (byte) (DhSectionPos.getDetailLevel(genPos) - DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL), genTask);
 		worldGenFuture.whenComplete((genTaskResult, ex) -> this.onWorldGenTaskComplete(genTaskResult, ex));
 		
 		return true;
@@ -237,6 +244,12 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 	public int getUnsavedDataSourceCount() { return this.delayedFullDataSourceSaveCache.getUnsavedCount(); }
 	
 	
+	public boolean isFullyGenerated(byte[] columnGenerationSteps)
+	{
+		return IntStream.range(0, columnGenerationSteps.length)
+				.noneMatch(i -> columnGenerationSteps[i] == EDhApiWorldGenerationStep.EMPTY.value);
+	}
+	
 	@Override
 	public LongArrayList getPositionsToRetrieve(Long pos)
 	{
@@ -385,23 +398,35 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 		public boolean isMemoryAddressValid() { return true; }
 		
 		@Override
-		public Consumer<FullDataSourceV2> getChunkDataConsumer()
+		public Consumer<FullDataSourceV2> getDataSourceConsumer()
 		{
 			return (chunkSizedFullDataSource) ->
 			{
 				GeneratedFullDataSourceProvider.this.delayedFullDataSourceSaveCache.queueDataSourceForUpdateAndSave(chunkSizedFullDataSource);
 			};
 		}
+		
 	}
 	private void onDataSourceSave(FullDataSourceV2 fullDataSource) 
-	{ GeneratedFullDataSourceProvider.this.updateDataSourceAsync(fullDataSource); }
+	{
+		// block lights should have been populated at the chunkWrapper stage
+		// waiting to populate the data source's skylight at this stage prevents re-lighting and
+		// allows us to reduce cross-chunk lighting issues by lighting the whole 4x4 LOD at once
+		DhLightingEngine.INSTANCE.bakeDataSourceSkyLight(fullDataSource, LodUtil.MAX_MC_LIGHT);
+		
+		GeneratedFullDataSourceProvider.this.updateDataSourceAsync(fullDataSource); 
+	}
 	
 	
 	
 	/** used by external event listeners */
-	@FunctionalInterface
 	public interface IOnWorldGenCompleteListener
 	{
+		boolean shouldDoWorldGen();
+		
+		@Nullable
+		DhBlockPos2D getTargetPosForGeneration();
+		
 		/** Fired whenever a section has completed generating */
 		void onWorldGenTaskComplete(long pos);
 		
@@ -19,15 +19,119 @@

 package com.seibel.distanthorizons.core.file.fullDatafile;

+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
+import com.seibel.distanthorizons.core.generation.RemoteWorldRetrievalQueue;
 import com.seibel.distanthorizons.core.level.IDhLevel;
+import com.seibel.distanthorizons.core.level.WorldGenModule;
+import com.seibel.distanthorizons.core.multiplayer.client.SyncOnLoginRequestQueue;
+import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import org.jetbrains.annotations.Nullable;

 import java.io.File;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;

-public class RemoteFullDataSourceProvider extends FullDataSourceProviderV2
+/**
+ * Only handles {@link SyncOnLoginRequestQueue} requests (IE updating existing LODs based on a timestamp).
+ * Missing data is handled by {@link WorldGenModule} and {@link RemoteWorldRetrievalQueue}.
+ */
+public class RemoteFullDataSourceProvider extends GeneratedFullDataSourceProvider
 {
-	public RemoteFullDataSourceProvider(IDhLevel level, AbstractSaveStructure saveStructure) { super(level, saveStructure); }
-	public RemoteFullDataSourceProvider(IDhLevel level, AbstractSaveStructure saveStructure, @Nullable File saveDirOverride) { super(level, saveStructure, saveDirOverride); }
+	@Nullable
+	private final SyncOnLoginRequestQueue syncOnLoginRequestQueue;
+	private final Set<Long> finishedTaskPositions = ConcurrentHashMap.newKeySet();
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public RemoteFullDataSourceProvider(
+			IDhLevel level, AbstractSaveStructure saveStructure, @Nullable File saveDirOverride, 
+			@Nullable SyncOnLoginRequestQueue syncOnLoginRequestQueue)
+	{
+		super(level, saveStructure, saveDirOverride);
+		this.syncOnLoginRequestQueue = syncOnLoginRequestQueue;
+	}
+	
+	
+	
+	//==================//
+	// override methods //
+	//==================//
+	
+	@Override
+	@Nullable
+	public FullDataSourceV2 get(long pos)
+	{
+		//=======================//
+		// get local data source //
+		//=======================//
+		
+		FullDataSourceV2 fullDataSource = super.get(pos);
+		if (fullDataSource == null)
+		{
+			// we don't have any local data for this position,
+			// we can't queue updates based on a timestamp
+			return null;	
+		}
+		
+		if (this.syncOnLoginRequestQueue == null)
+		{
+			// we have local data, but aren't allowed to
+			// request timestamp updates from the server.
+			return fullDataSource;
+		}
+		
+		
+		
+		//===========================//
+		// request timestamp updates //
+		// from server               //
+		//===========================//
+		
+		// get the timestamp for every maximum detail position in this section
+		int posToMinimumDetailScale = (DhSectionPos.getDetailLevel(pos) - DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL + 1);
+		Map<Long, Long> timestamps = this.getTimestampsForRange(
+				DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL,
+				DhSectionPos.getX(pos) * posToMinimumDetailScale,
+				DhSectionPos.getZ(pos) * posToMinimumDetailScale,
+				(DhSectionPos.getX(pos) + 1) * posToMinimumDetailScale - 1,
+				(DhSectionPos.getZ(pos) + 1) * posToMinimumDetailScale - 1
+		);
+		
+		// check if the server has newer versions of these LODs
+		for (Map.Entry<Long, Long> timestampBySectionPos : timestamps.entrySet())
+		{
+			Long subPos = timestampBySectionPos.getKey();
+			Long subTimestamp = timestampBySectionPos.getValue();
+			
+			if (this.finishedTaskPositions.add(subPos))
+			{
+				this.syncOnLoginRequestQueue.submitRequest(subPos, subTimestamp, this.delayedFullDataSourceSaveCache::queueDataSourceForUpdateAndSave);
+			}
+		}
+		
+		return fullDataSource;
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		if (this.syncOnLoginRequestQueue != null)
+		{
+			this.syncOnLoginRequestQueue.close();
+		}
+		super.close();
+	}
 	
 }
@@ -29,7 +29,6 @@ import com.seibel.distanthorizons.core.util.objects.ParsedIp;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftSharedWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
-import com.seibel.distanthorizons.core.wrapperInterfaces.world.IDimensionTypeWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.coreapi.util.StringUtil;

@@ -88,9 +87,9 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 			if (newLevelWrapper instanceof IServerKeyedClientLevel)
 			{
 				IServerKeyedClientLevel keyedClientLevel = (IServerKeyedClientLevel) newLevelWrapper;
-				LOGGER.info("Loading level " + newLevelWrapper.getDimensionType().getDimensionName() + " with key: " + keyedClientLevel.getServerLevelKey());
+				LOGGER.info("Loading level " + newLevelWrapper.getDimensionName() + " with key: " + keyedClientLevel.getServerLevelKey());
 				// This world was identified by the server directly, so we can know for sure which folder to use.
-				return new File(getSaveStructureFolderPath() + File.separatorChar + keyedClientLevel.getServerLevelKey());
+				return new File(getSaveStructureFolderPath() + File.separatorChar + keyedClientLevel.getServerLevelKey().replaceAll(":", "@@"));
 			}
 			
 			
@@ -102,9 +101,9 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 				// create the matcher if one doesn't exist
 				if (this.subDimMatcher == null || !this.subDimMatcher.isFindingLevel(newClientLevelWrapper))
 				{
-					LOGGER.info("Loading level " + newClientLevelWrapper.getDimensionType().getDimensionName());
+					LOGGER.info("Loading level " + newClientLevelWrapper.getDimensionName());
 					
-					List<File> levelFolders = this.getDhDataFoldersForDimension(newClientLevelWrapper.getDimensionType());
+					List<File> levelFolders = this.getDhDataFoldersForLevel(newClientLevelWrapper);
 					this.subDimMatcher = new SubDimensionLevelMatcher(newClientLevelWrapper, this.folder, levelFolders);
 				}
 				
@@ -133,7 +132,7 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 	
 	private File getLevelFolderWithoutSimilarityMatching(ILevelWrapper level)
 	{
-		List<File> folders = this.getDhDataFoldersForDimension(level.getDimensionType());
+		List<File> folders = this.getDhDataFoldersForLevel(level);
 		if (!folders.isEmpty() && folders.get(0) != null)
 		{
 			// use the first existing sub-dimension
@@ -144,12 +143,12 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 		else
 		{
 			// no valid sub dimension was found, create a new one
-			LOGGER.info("Default Sub Dimension not found. Creating: [" + level.getDimensionType().getDimensionName() + "]");
-			return new File(this.folder, level.getDimensionType().getDimensionName());
+			LOGGER.info("Default Sub Dimension not found. Creating: [" + level.getDimensionName() + "]");
+			return new File(this.folder, level.getDimensionName().replaceAll(":", "@@"));
 		}
 	}
 	
-	public List<File> getDhDataFoldersForDimension(IDimensionTypeWrapper dimensionType)
+	public List<File> getDhDataFoldersForLevel(ILevelWrapper level)
 	{
 		File[] folders = this.folder.listFiles();
 		if (folders == null)
@@ -158,7 +157,7 @@ public class ClientOnlySaveStructure extends AbstractSaveStructure
 		}
 		
 		// filter by dimension name
-		String expectedDimName = dimensionType.getDimensionName();
+		String expectedDimName = level.getDimensionName();
 		ArrayList<File> possibleDimFolders = new ArrayList<>();
 		for (File dimFolder : folders)
 		{
@@ -60,6 +60,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 * @author James Seibel
 * @version 12-17-2022
 */
+@Deprecated
 public class SubDimensionLevelMatcher implements AutoCloseable
 {
 	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
@@ -184,11 +185,6 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 		DhLightingEngine.INSTANCE.lightChunk(newlyLoadedChunk, new ArrayList<>(), MC_CLIENT.getWrappedClientLevel().hasSkyLight() ? 15 : 0);
 		
 		// build the chunk LOD
-		if (!LodDataBuilder.canGenerateLodFromChunk(newlyLoadedChunk))
-		{
-			LOGGER.warn("unable to build lod for chunk:"+newlyLoadedChunk.getChunkPos());
-			return null;
-		}
 		FullDataSourceV2 newChunkSizedFullDataView = FullDataSourceV2.createFromChunk(newlyLoadedChunk);
 		// convert to a data source for easier comparing
 		FullDataSourceV2 newDataSource = FullDataSourceV2.createEmpty(DhSectionPos.encodeContaining(DhSectionPos.SECTION_BLOCK_DETAIL_LEVEL, this.playerData.playerBlockPos));
@@ -201,7 +197,7 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 		//================================//
 		
 		// log the start of this attempt
-		LOGGER.info("Attempting to determine sub-dimension for [" + MC_CLIENT.getWrappedClientLevel().getDimensionType().getDimensionName() + "]");
+		LOGGER.info("Attempting to determine sub-dimension for [" + MC_CLIENT.getWrappedClientLevel().getDimensionName() + "]");
 		LOGGER.info("Player block pos in dimension: [" + this.playerData.playerBlockPos.getX() + "," + this.playerData.playerBlockPos.getY() + "," + this.playerData.playerBlockPos.getZ() + "]");
 		LOGGER.info("Potential Sub Dimension folders: [" + this.potentialLevelFolders.size() + "]");
 		
@@ -214,7 +210,7 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 			try
 			{
 				// get the data source to compare against
-				try (IDhLevel tempLevel = new DhClientLevel(new ClientOnlySaveStructure(), this.currentClientLevel, testLevelFolder, false))
+				try (IDhLevel tempLevel = new DhClientLevel(new ClientOnlySaveStructure(), this.currentClientLevel, testLevelFolder, false, null))
 				{
 					testFullDataSource = tempLevel.getFullDataProvider().getAsync(DhSectionPos.encodeContaining(DhSectionPos.SECTION_BLOCK_DETAIL_LEVEL, this.playerData.playerBlockPos)).join();
 					if (testFullDataSource == null)
@@ -380,7 +376,7 @@ public class SubDimensionLevelMatcher implements AutoCloseable
 	}
 	
 	
-	private File CreateSubDimFolder(String subDimId) { return new File(this.levelsFolder.getPath() + File.separatorChar + this.currentClientLevel.getDimensionType().getDimensionName(), subDimId); }
+	private File CreateSubDimFolder(String subDimId) { return new File(this.levelsFolder.getPath() + File.separatorChar + this.currentClientLevel.getDimensionName(), subDimId); }
 	
 	@Override
 	public void close() { this.matcherThread.shutdownNow(); }
@@ -19,6 +19,7 @@

 package com.seibel.distanthorizons.core.generation;

+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.enums.EDhDirection;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
@@ -26,9 +27,12 @@ import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPosMutable;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
+import com.seibel.distanthorizons.core.util.FullDataPointUtil;
 import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IMutableBlockPosWrapper;
+import it.unimi.dsi.fastutil.longs.LongArrayList;
 import org.apache.logging.log4j.Logger;

 import java.awt.*;
@@ -56,11 +60,23 @@ public class DhLightingEngine
 	private static final ThreadLocal<DhBlockPosMutable> PRIMARY_BLOCK_POS_REF = ThreadLocal.withInitial(() -> new DhBlockPosMutable());
 	private static final ThreadLocal<DhBlockPosMutable> SECONDARY_BLOCK_POS_REF = ThreadLocal.withInitial(() -> new DhBlockPosMutable());
 	
-	/** if enabled will render each block light value when the lighting engine is run */
+	/** if enabled will render each block light value when the chunk lighting engine is run */
 	private static final boolean RENDER_BLOCK_LIGHT_WIREFRAME = false;
-	/** if enabled will render each sky light value when the lighting engine is run */
+	/** if enabled will render each sky light value when the chunk lighting engine is run */
 	private static final boolean RENDER_SKY_LIGHT_WIREFRAME = false;
 	
+	/**
+	 * Used for dataSource lighting. <br> 
+	 * Packed as alternating x and z offsets. 
+	 */
+	private static final byte[] ADJACENT_DIRECTION_OFFSETS = new byte[]
+			{
+					-1, 0,
+					+1, 0,
+					0, -1,
+					0, +1
+			};
+	
 	
 	
 	//=============//
@@ -71,9 +87,28 @@ public class DhLightingEngine
 	
 	
 	
-	//=========//
-	// methods //
-	//=========//
+	//================//
+	// chunk lighting //
+	//================//
+	
+	/**
+	 * Populates both block and sky lighting. 
+	 * @see DhLightingEngine#lightChunk(IChunkWrapper, ArrayList, int, boolean, boolean) 
+	 */
+	public void lightChunk(
+			@NotNull IChunkWrapper centerChunk, @NotNull ArrayList<IChunkWrapper> nearbyChunkList,
+			int maxSkyLight)
+	{ this.lightChunk(centerChunk, nearbyChunkList, maxSkyLight, true, true); }
+	
+	/**
+	 * Only populates block lights. 
+	 * @see DhLightingEngine#lightChunk(IChunkWrapper, ArrayList, int, boolean, boolean) 
+	 */
+	public void bakeChunkBlockLighting(
+			@NotNull IChunkWrapper centerChunk, @NotNull ArrayList<IChunkWrapper> nearbyChunkList,
+			int maxSkyLight)
+	{ this.lightChunk(centerChunk, nearbyChunkList, maxSkyLight, true, false); }
+	
 	
 	/**
 	 * Note: depending on the implementation of {@link IChunkWrapper#setDhBlockLight(int, int, int, int)} and {@link IChunkWrapper#setDhSkyLight(int, int, int, int)}
@@ -84,13 +119,13 @@ public class DhLightingEngine
 	 * @param nearbyChunkList should also contain centerChunk
 	 * @param maxSkyLight should be a value between 0 and 15
 	 */
-	public void lightChunk(@NotNull IChunkWrapper centerChunk, @NotNull ArrayList<IChunkWrapper> nearbyChunkList, int maxSkyLight)
+	private void lightChunk(
+			@NotNull IChunkWrapper centerChunk, @NotNull ArrayList<IChunkWrapper> nearbyChunkList, 
+			int maxSkyLight, boolean updateBlockLight, boolean updateSkyLight)
 	{
 		DhChunkPos centerChunkPos = centerChunk.getChunkPos();
 		AdjacentChunkHolder adjacentChunkHolder = new AdjacentChunkHolder(centerChunk);
 		
-		long startTimeNs = System.nanoTime();
-		
 		
 		// try-finally to handle the stableArray resources
 		StableLightPosStack blockLightWorldPosQueue = null;
@@ -117,7 +152,6 @@ public class DhLightingEngine
 			
 			// find all adjacent chunks
 			// and get any necessary info from them
-			boolean warningLogged = false;
 			for (int chunkIndex = 0; chunkIndex < nearbyChunkList.size(); chunkIndex++) // using iterators in high traffic areas can cause GC issues due to allocating a bunch of iterators, use an indexed for-loop instead
 			{
 				IChunkWrapper chunk = nearbyChunkList.get(chunkIndex);
@@ -129,15 +163,17 @@ public class DhLightingEngine
 					// add the adjacent chunk
 					adjacentChunkHolder.add(chunk);
 					
+					// get and set the adjacent chunk's initial block lights
+					final DhBlockPosMutable relLightBlockPos = PRIMARY_BLOCK_POS_REF.get();
+					
 					
 					
 					//==================//
 					// set block lights //
 					//==================//
 					
-					// get and set the adjacent chunk's initial block lights
-					final DhBlockPosMutable relLightBlockPos = PRIMARY_BLOCK_POS_REF.get();
-					
+					if (updateBlockLight)
+					{
 						ArrayList<DhBlockPos> blockLightPosList = chunk.getWorldBlockLightPosList();
 						for (int blockLightIndex = 0; blockLightIndex < blockLightPosList.size(); blockLightIndex++) // using iterators in high traffic areas can cause GC issues due to allocating a bunch of iterators, use an indexed for-loop instead
 						{
@@ -152,6 +188,7 @@ public class DhLightingEngine
 							// set the light
 							chunk.setDhBlockLight(relLightBlockPos.getX(), relLightBlockPos.getY(), relLightBlockPos.getZ(), lightValue);
 						}
+					}
 					
 					
 					
@@ -161,8 +198,11 @@ public class DhLightingEngine
 					
 					// get and set the adjacent chunk's initial skylights,
 					// if the dimension has skylights
-					if (maxSkyLight > 0)
+					if (updateSkyLight && maxSkyLight > 0)
 					{
+						IMutableBlockPosWrapper mcBlockPos = chunk.getMutableBlockPosWrapper();
+						IBlockStateWrapper previousBlockState = null;
+						
 						int maxY = chunk.getMaxNonEmptyHeight();
 						int minY = chunk.getMinBuildHeight();
 						
@@ -174,7 +214,7 @@ public class DhLightingEngine
 								// set each pos' sky light all the way down until an opaque block is hit
 								for (int y = maxY; y >= minY; y--)
 								{
-									IBlockStateWrapper block = chunk.getBlockState(relX, y, relZ);
+									IBlockStateWrapper block = previousBlockState = chunk.getBlockState(relX, y, relZ, mcBlockPos, previousBlockState);
 									if (block != null && block.getOpacity() != LodUtil.BLOCK_FULLY_TRANSPARENT)
 									{
 										// keep moving down until we find a non-transparent block
@@ -204,17 +244,23 @@ public class DhLightingEngine
 			}
 			
 			// block light
-			this.propagateLightPosList(blockLightWorldPosQueue, adjacentChunkHolder,
+			if (updateBlockLight)
+			{
+				this.propagateChunkLightPosList(blockLightWorldPosQueue, adjacentChunkHolder,
 						(neighbourChunk, relBlockPos) -> neighbourChunk.getDhBlockLight(relBlockPos.getX(), relBlockPos.getY(), relBlockPos.getZ()),
 						(neighbourChunk, relBlockPos, newLightValue) -> neighbourChunk.setDhBlockLight(relBlockPos.getX(), relBlockPos.getY(), relBlockPos.getZ(), newLightValue),
 						true);
+			}
 			
 			// sky light
-			this.propagateLightPosList(skyLightWorldPosQueue, adjacentChunkHolder,
+			if (updateSkyLight)
+			{
+				this.propagateChunkLightPosList(skyLightWorldPosQueue, adjacentChunkHolder,
 						(neighbourChunk, relBlockPos) -> neighbourChunk.getDhSkyLight(relBlockPos.getX(), relBlockPos.getY(), relBlockPos.getZ()),
 						(neighbourChunk, relBlockPos, newLightValue) -> neighbourChunk.setDhSkyLight(relBlockPos.getX(), relBlockPos.getY(), relBlockPos.getZ(), newLightValue),
 						false);
 			}
+		}
 		catch (Exception e)
 		{
 			LOGGER.error("Unexpected lighting issue for center chunk: "+centerChunkPos, e);
@@ -226,17 +272,18 @@ public class DhLightingEngine
 		}
 		
 		
-		
-		centerChunk.setIsDhLightCorrect(true);
-		centerChunk.setUseDhLighting(true);
-		
-		long endTimeNs = System.nanoTime();
-		float totalTimeMs = (endTimeNs - startTimeNs) / 1_000_000.0f;
-		//LOGGER.trace("Finished generating lighting for chunk: [" + centerChunkPos + "] in ["+totalTimeMs+"] milliseconds");
+		if (updateBlockLight)
+		{
+			centerChunk.setIsDhBlockLightCorrect(true);
+		}
+		if (updateSkyLight)
+		{
+			centerChunk.setIsDhSkyLightCorrect(true);
+		}
 	}
 	
 	/** Applies each {@link LightPos} from the queue to the given set of {@link IChunkWrapper}'s. */
-	private void propagateLightPosList(
+	private void propagateChunkLightPosList(
 			StableLightPosStack lightPosQueue, AdjacentChunkHolder adjacentChunkHolder,
 			IGetLightFunc getLightFunc, ISetLightFunc setLightFunc,
 			boolean propagatingBlockLights)
@@ -247,6 +294,8 @@ public class DhLightingEngine
 		final DhBlockPosMutable neighbourBlockPos = PRIMARY_BLOCK_POS_REF.get();
 		final DhBlockPosMutable relNeighbourBlockPos = SECONDARY_BLOCK_POS_REF.get();
 		
+		IMutableBlockPosWrapper mcBlockPos = null;
+		IBlockStateWrapper previousBlockState = null;
 		
 		// update each light position
 		while (!lightPosQueue.isEmpty())
@@ -290,7 +339,15 @@ public class DhLightingEngine
 				}
 				
 				
-				IBlockStateWrapper neighbourBlockState = neighbourChunk.getBlockState(relNeighbourBlockPos);
+				if (mcBlockPos == null)
+				{
+					// it doesn't matter what chunk we get the position object from
+					// TODO move this getter logic out of ChunkWrapper
+					mcBlockPos = neighbourChunk.getMutableBlockPosWrapper();
+				}
+				
+				
+				IBlockStateWrapper neighbourBlockState = previousBlockState = neighbourChunk.getBlockState(relNeighbourBlockPos, mcBlockPos, previousBlockState);
 				// Math.max(1, ...) is used so that the propagated light level always drops by at least 1, preventing infinite cycles.
 				int targetLevel = lightValue - Math.max(1, neighbourBlockState.getOpacity());
 				if (targetLevel > currentBlockLight)
@@ -322,6 +379,241 @@ public class DhLightingEngine
 	
 	
 	
+	//======================//
+	// data source lighting //
+	//======================//
+	
+	/** @author BuilderB0y */
+	public void bakeDataSourceSkyLight(FullDataSourceV2 dataSource, int maxSkyLight)
+	{
+		// create a cache of all the IDs which are completely transparent.
+		// FullDataPointIdMap is thread-safe with locks, and is also a map lookup,
+		// and both of these things add a bit of overhead which is not necessary
+		// in this context.
+		// note: since IDs map to both biomes and blocks, there can be more than
+		// one ID which corresponds to air.
+		BitSet airIDs = new BitSet(dataSource.mapping.size());
+		for (int id = 0, size = dataSource.mapping.size(); id < size; id++)
+		{
+			if (dataSource.mapping.getBlockStateWrapper(id).getOpacity() == 0)
+			{
+				airIDs.set(id, true);
+			}
+		}
+		
+		
+		for (int z = 0; z < FullDataSourceV2.WIDTH; z++)
+		{
+			for (int x = 0; x < FullDataSourceV2.WIDTH; x++)
+			{
+				LongArrayList dataPoints = dataSource.get(x, z);
+				if (dataPoints != null && !dataPoints.isEmpty())
+				{
+					// iterate through the data points in this column top-down
+					// until we reach light level 0 in some way. at this point,
+					// no more propagation needs to be performed for this column.
+					int size = dataPoints.size();
+					for (int index = 0; index < size; index++)
+					{
+						long point = dataPoints.getLong(index);
+						// if the data point in the column is transparent,
+						// then fill it with light and then propagate 
+						// that light both horizontally and downwards.
+						if (airIDs.get(FullDataPointUtil.getId(point)))
+						{
+							int skylight;
+							if (index == 0)
+							{
+								// top-most data point in the column.
+								skylight = maxSkyLight;
+							}
+							else
+							{
+								// handle down propagation here. sort of.
+								// down propagation is also handled partially elsewhere.
+								// basically if the data point above is transparent,
+								// we copy its light level.
+								// otherwise, if the data point above is opaque,
+								// then no light can propagate downwards from it.
+								// therefore, this data point should be light level 0*
+								// and no more propagation needs to be performed for this column.
+								//
+								// *unless light propagates into it horizontally,
+								// but that is handled separately.
+								long above = dataPoints.getLong(index - 1);
+								if (airIDs.get(FullDataPointUtil.getId(above)))
+								{
+									skylight = FullDataPointUtil.getSkyLight(above);
+								}
+								else
+								{
+									continue;
+								}
+							}
+							
+							// update the data point to contain the correct starting skylight level.
+							point = FullDataPointUtil.setSkyLight(point, skylight);
+							dataPoints.set(index, point);
+							// now for the propagation.
+							recursivelyLightAdjacentDataPoints(dataSource, airIDs, x, z, point);
+						}
+					}
+				}
+			}
+		}
+		
+		
+		// at this point, all transparent data points have been lit,
+		// but opaque ones still have light level 0.
+		// in this loop we make opaque data points copy the light level
+		// above them if, and only if, the data point above is translucent.
+		// with one exception: if the data point above is only partially translucent,
+		// we use a slightly different way of computing how much light it absorbed.
+		// this is how we handle water and ocean floors.
+		// note that this alternate logic assumes the 
+		// data point above is being lit from the top.
+		// this is a fine assumption for water and oceans.
+		for (LongArrayList list : dataSource.dataPoints)
+		{
+			if (list != null)
+			{
+				for (int index = 0, size = list.size(); index < size; index++)
+				{
+					long dataPoint = list.getLong(index);
+					if (index == 0)
+					{
+						// top data point, assume "above" has the max sky light.
+						dataPoint = FullDataPointUtil.setSkyLight(dataPoint, maxSkyLight);
+						list.set(index, dataPoint);
+					}
+					else
+					{
+						// there is another data point above this one.
+						// check to see how opaque this data point is first.
+						// we will check the above one after that.
+						if (!airIDs.get(FullDataPointUtil.getId(dataPoint)))
+						{
+							// this data point is not transparent.
+							// it should be lit from above.
+							long above = list.getLong(index - 1);
+							int aboveLight = FullDataPointUtil.getSkyLight(above);
+							if (airIDs.get(FullDataPointUtil.getId(above)))
+							{
+								// the above data point is transparent,
+								// and does not absorb any light.
+								// its light level can be copied as-is.
+								dataPoint = FullDataPointUtil.setSkyLight(dataPoint, aboveLight);
+								list.set(index, dataPoint);
+							}
+							else
+							{
+								// determine how much light should be absorbed by this column
+								int absorption = dataSource.mapping.getBlockStateWrapper(FullDataPointUtil.getId(above)).getOpacity() * FullDataPointUtil.getHeight(above);
+								if (absorption < aboveLight)
+								{
+									// the above data point is partially translucent,
+									// and absorbs some light. however, it did not absorb
+									// enough light to bring the light level down to 0.
+									// so, the remaining light can still be copied.
+									dataPoint = FullDataPointUtil.setSkyLight(dataPoint, aboveLight - absorption);
+									list.set(index, dataPoint);
+								}
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	
+	/** @author BuilderB0y */
+	public void recursivelyLightAdjacentDataPoints(
+			FullDataSourceV2 chunk,
+			BitSet airIDs,
+			int relativeX,
+			int relativeZ,
+			long dataPoint
+		)
+	{
+		int lightLevel = FullDataPointUtil.getSkyLight(dataPoint);
+		// early exit condition:
+		// in this case, propagating light is guaranteed to be 0 at adjacent positions,
+		// and therefore we do not need to waste time propagating it.
+		if (lightLevel <= 1)
+		{
+			return;
+		}
+		
+		
+		
+		int minY = FullDataPointUtil.getBottomY(dataPoint);
+		int maxY = FullDataPointUtil.getHeight(dataPoint) + minY;
+		// try to propagate in all 4 directions.
+		for (int offsetIndex = 0; offsetIndex < ADJACENT_DIRECTION_OFFSETS.length; )
+		{
+			int adjacentX = relativeX + ADJACENT_DIRECTION_OFFSETS[offsetIndex++];
+			int adjacentZ = relativeZ + ADJACENT_DIRECTION_OFFSETS[offsetIndex++];
+			
+			// check if the adjacent position is within the bounds of this data source...
+			if (adjacentX >= 0 && adjacentX < FullDataSourceV2.WIDTH && adjacentZ >= 0 && adjacentZ < FullDataSourceV2.WIDTH)
+			{
+				LongArrayList adjacentDataPoints = chunk.get(adjacentX, adjacentZ);
+				// ...and also check to make sure we have some data points
+				// (potentially transparent ones) to propagate through in the adjacent column.
+				if (adjacentDataPoints != null)
+				{
+					// try to find adjacent data points we can propagate into.
+					// we go top-down for this, which will be important for some
+					// later conditions.
+					int size = adjacentDataPoints.size();
+					for (int adjacentIndex = 0; adjacentIndex < size; adjacentIndex++)
+					{
+						long adjacentDataPoint = adjacentDataPoints.getLong(adjacentIndex);
+						int adjacentMinY = FullDataPointUtil.getBottomY(adjacentDataPoint);
+						int adjacentMaxY = FullDataPointUtil.getHeight(adjacentDataPoint) + adjacentMinY;
+						if (adjacentMinY >= maxY)
+						{
+							// if the adjacent data point is completely above this one,
+							// then there is no overlap between this one and the adjacent one,
+							// and therefore light cannot propagate here.
+							// try to propagate to the next data point down from the adjacent one.
+							continue;
+						}
+						else if (adjacentMaxY <= minY)
+						{
+							// if the adjacent data point is completely below this one,
+							// then it also has no overlap and can't propagate,
+							// but since we're going top-down, neither can any subsequent adjacent data points.
+							break;
+						}
+						else if (!airIDs.get(FullDataPointUtil.getId(adjacentDataPoint)))
+						{
+							// assume for now that we cannot propagate into non-transparent data points.
+							continue; // TODO how does this work with water? Do we care?
+						}
+						else
+						{
+							// now we can try to propagate.
+							int adjacentLightLevel = FullDataPointUtil.getSkyLight(adjacentDataPoint);
+							// if the resulting light level after propagation would INCREASE
+							// the light level of the adjacent data point, then propagate to it.
+							// otherwise, don't do that.
+							if (lightLevel - 1 > adjacentLightLevel)
+							{
+								adjacentDataPoint = FullDataPointUtil.setSkyLight(adjacentDataPoint, lightLevel - 1);
+								adjacentDataPoints.set(adjacentIndex, adjacentDataPoint);
+								// if propagation succeeded, recursively propagate again starting at the adjacent data point.
+								recursivelyLightAdjacentDataPoints(chunk, airIDs, adjacentX, adjacentZ, adjacentDataPoint);
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+	
+	
+	
 	//===========//
 	// debugging //
 	//===========//
@@ -26,6 +26,7 @@ import com.seibel.distanthorizons.core.pos.DhSectionPos;
 import com.seibel.distanthorizons.core.render.LodQuadTree;

 import java.io.Closeable;
+import java.util.List;
 import java.util.concurrent.CompletableFuture;

 /**
@@ -49,9 +50,17 @@ public interface IFullDataSourceRetrievalQueue extends Closeable
 	// getters //
 	//=========//
 	
-	/** the largest numerical detail level */
+	/** 
+	 * The largest numerical detail level. <br>
+	 * Detail level is absolute, not section;
+	 * IE 0 = Block, 1 = 2x2 blocks, etc.
+	 */
 	byte lowestDataDetail();
-	/** the smallest numerical detail level */
+	/** 
+	 * The smallest numerical detail level. <br>
+	 * Detail level is absolute, not section;
+	 * IE 0 = Block, 1 = 2x2 blocks, etc.
+	 */
 	byte highestDataDetail();
 	
 	
@@ -81,7 +90,7 @@ public interface IFullDataSourceRetrievalQueue extends Closeable
 	 */
 	void removeRetrievalRequestIf(DhSectionPos.ICancelablePrimitiveLongConsumer removeIf);
 	
-	CompletableFuture<WorldGenResult> submitGenTask(long pos, byte requiredDataDetail, IWorldGenTaskTracker tracker);
+	CompletableFuture<WorldGenResult> submitRetrievalTask(long pos, byte requiredDataDetail, IWorldGenTaskTracker tracker);
 	
 	
 	
@@ -89,7 +98,10 @@ public interface IFullDataSourceRetrievalQueue extends Closeable
 	// shutdown //
 	//==========//
 	
-	CompletableFuture<Void> startClosing(boolean cancelCurrentGeneration, boolean alsoInterruptRunning);
+	/** Can be used to let any lingering generation requests finish before fully shutting down the system */
+	CompletableFuture<Void> startClosingAsync(boolean cancelCurrentGeneration, boolean alsoInterruptRunning);
+	
+	@Override
 	void close();
 	
 	
@@ -105,5 +117,7 @@ public interface IFullDataSourceRetrievalQueue extends Closeable
 	int getEstimatedTotalTaskCount();
 	void setEstimatedTotalTaskCount(int newEstimate);

+	void addDebugMenuStringsToList(List<String> messageList);
+	
 	
 }
@@ -0,0 +1,84 @@
+package com.seibel.distanthorizons.core.generation;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.generation.tasks.IWorldGenTaskTracker;
+import com.seibel.distanthorizons.core.generation.tasks.WorldGenResult;
+import com.seibel.distanthorizons.core.level.IDhClientLevel;
+import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.multiplayer.client.AbstractFullDataNetworkRequestQueue;
+import com.seibel.distanthorizons.core.multiplayer.client.ClientNetworkState;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.render.renderer.IDebugRenderable;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import org.apache.logging.log4j.Logger;
+
+import java.util.concurrent.*;
+
+public class RemoteWorldRetrievalQueue extends AbstractFullDataNetworkRequestQueue implements IFullDataSourceRetrievalQueue, IDebugRenderable
+{
+	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
+	
+	private int estimatedTotalTaskCount;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public RemoteWorldRetrievalQueue(ClientNetworkState networkState, IDhClientLevel level)
+	{ super(networkState, level, false, Config.Client.Advanced.Debugging.DebugWireframe.showWorldGenQueue); }
+	
+	
+	
+	//===========================//
+	// retrieval queue overrides //
+	//===========================//
+	
+	@Override
+	public void startAndSetTargetPos(DhBlockPos2D targetPos) { super.tick(targetPos); }
+	
+	@Override
+	public byte lowestDataDetail() { return LodUtil.BLOCK_DETAIL_LEVEL; }
+	@Override
+	public byte highestDataDetail() { return LodUtil.BLOCK_DETAIL_LEVEL; }
+	
+	@Override
+	public CompletableFuture<WorldGenResult> submitRetrievalTask(long sectionPos, byte requiredDataDetail, IWorldGenTaskTracker tracker)
+	{
+		return super.submitRequest(sectionPos, tracker.getDataSourceConsumer())
+				.thenApply(retrievalSuccess -> retrievalSuccess
+						? WorldGenResult.CreateSuccess(sectionPos)
+						: WorldGenResult.CreateFail());
+	}
+	
+	@Override
+	public CompletableFuture<Void> startClosingAsync(boolean cancelCurrentGeneration, boolean alsoInterruptRunning)
+	{ return super.startClosingAsync(alsoInterruptRunning); }
+	
+	
+	
+	//=================================//
+	// network request queue overrides //
+	//=================================//
+	
+	@Override
+	protected int getRequestRateLimit() { return this.networkState.sessionConfig.getGenerationRequestRateLimit(); }
+	
+	@Override
+	protected String getQueueName() { return "World Remote Generation Queue"; }
+	
+	
+	
+	//===============//
+	// debug display //
+	//===============//
+	
+	@Override
+	public int getEstimatedTotalTaskCount() { return this.estimatedTotalTaskCount; }
+	@Override
+	public void setEstimatedTotalTaskCount(int newEstimate) { this.estimatedTotalTaskCount = newEstimate; }
+	
+	
+	
+}
@@ -47,6 +47,7 @@ import org.apache.logging.log4j.Logger;

 import java.awt.*;
 import java.util.*;
+import java.util.List;
 import java.util.concurrent.*;
 import java.util.function.Consumer;

@@ -141,7 +142,7 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 	//=================//
 	
 	@Override
-	public CompletableFuture<WorldGenResult> submitGenTask(long pos, byte requiredDataDetail, IWorldGenTaskTracker tracker)
+	public CompletableFuture<WorldGenResult> submitRetrievalTask(long pos, byte requiredDataDetail, IWorldGenTaskTracker tracker)
 	{
 		// the generator is shutting down, don't add new tasks
 		if (this.generatorClosingFuture != null)
@@ -467,7 +468,7 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 						try
 						{
 							IChunkWrapper chunk = WRAPPER_FACTORY.createChunkWrapper(generatedObjectArray);
-							FullDataSourceV2 dataSource = LodDataBuilder.createGeneratedDataSource(chunk);
+							FullDataSourceV2 dataSource = LodDataBuilder.createFromChunk(chunk);
 							LodUtil.assertTrue(dataSource != null);
 							chunkDataConsumer.accept(dataSource);
 						}
@@ -535,13 +536,15 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 	@Override
 	public void setEstimatedTotalTaskCount(int newEstimate) { this.estimatedTotalTaskCount = newEstimate; }
 	
+	public void addDebugMenuStringsToList(List<String> messageList) { }
+	
 	
 	
 	//==========//
 	// shutdown //
 	//==========//
 	
-	public CompletableFuture<Void> startClosing(boolean cancelCurrentGeneration, boolean alsoInterruptRunning)
+	public CompletableFuture<Void> startClosingAsync(boolean cancelCurrentGeneration, boolean alsoInterruptRunning)
 	{
 		LOGGER.info("Closing world gen queue");
 		this.queueingThread.shutdownNow();
@@ -592,7 +595,7 @@ public class WorldGenerationQueue implements IFullDataSourceRetrievalQueue, IDeb
 		
 		if (this.generatorClosingFuture == null)
 		{
-			this.startClosing(true, true);
+			this.startClosingAsync(true, true);
 		}
 		LodUtil.assertTrue(this.generatorClosingFuture != null);
 		
@@ -21,6 +21,7 @@ package com.seibel.distanthorizons.core.generation.tasks;

 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;

+import javax.annotation.Nullable;
 import java.util.function.Consumer;

 /**
@@ -32,6 +33,7 @@ public interface IWorldGenTaskTracker
 	/** Returns true if the task hasn't been garbage collected. */
 	boolean isMemoryAddressValid();
 	
-	Consumer<FullDataSourceV2> getChunkDataConsumer();
+	@Nullable
+	Consumer<FullDataSourceV2> getDataSourceConsumer();
 	
 }
@@ -51,7 +51,7 @@ public final class WorldGenTaskGroup
 		while (tasks.hasNext())
 		{
 			WorldGenTask task = tasks.next();
-			Consumer<FullDataSourceV2> chunkDataConsumer = task.taskTracker.getChunkDataConsumer();
+			Consumer<FullDataSourceV2> chunkDataConsumer = task.taskTracker.getDataSourceConsumer();
 			if (chunkDataConsumer == null)
 			{
 				tasks.remove();
@@ -103,10 +103,14 @@ public class DarkModeDetector
 		{
 //            System.out.println(de);
 			if (de.contains("gnome-session")) // Gnome uses GTK
+			{
 				return GTKChecker();
+			}
 			if (de.contains("plasma_session")) // KDE plasma uses QT
+			{
 				return QTChecker();
 			}
+		}
 		return GTKChecker(); // GTK works best with non plasma desktops (desktops includes window managers)
 	}
 	
@@ -134,7 +138,9 @@ public class DarkModeDetector
 			while (themeLine != null)
 			{ // Go through each line till you find "KWinPalette\activeBackground"
 				if (themeLine.contains("KWinPalette\\activeBackground"))
+				{
 					break;
+				}
 				themeLine = reader.readLine();
 			}
 			reader.close();
@@ -145,10 +151,14 @@ public class DarkModeDetector
 			short g = (short) Integer.parseInt("" + themeLine.charAt(index + 3) + themeLine.charAt(index + 4), 16);
 			short b = (short) Integer.parseInt("" + themeLine.charAt(index + 5) + themeLine.charAt(index + 6), 16);
 			if ((r + g + b) / 2 >= 128)
+			{
 				return false;
+			}
 			else
+			{
 				return true;
 			}
+		}
 		catch (Exception e)
 		{
 			e.printStackTrace(); return false;
@@ -170,7 +180,9 @@ public class DarkModeDetector
 				while ((actualReadLine = reader.readLine()) != null)
 				{
 					if (stringBuilder.length() != 0)
+					{
 						stringBuilder.append('\n');
+					}
 					stringBuilder.append(actualReadLine);
 				}
 			}
@@ -22,6 +22,7 @@ package com.seibel.distanthorizons.core.level;
 import com.seibel.distanthorizons.api.methods.events.abstractEvents.DhApiChunkModifiedEvent;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.fullDatafile.DelayedFullDataSourceSaveCache;
+import com.seibel.distanthorizons.core.generation.DhLightingEngine;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.pos.DhSectionPos;
@@ -30,8 +31,10 @@ import com.seibel.distanthorizons.core.render.renderer.generic.CloudRenderHandle
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
 import com.seibel.distanthorizons.core.sql.dto.BeaconBeamDTO;
 import com.seibel.distanthorizons.core.sql.dto.ChunkHashDTO;
+import com.seibel.distanthorizons.core.sql.repo.AbstractDhRepo;
 import com.seibel.distanthorizons.core.sql.repo.BeaconBeamRepo;
 import com.seibel.distanthorizons.core.sql.repo.ChunkHashRepo;
+import com.seibel.distanthorizons.core.util.LodUtil;
 import com.seibel.distanthorizons.core.wrapperInterfaces.chunk.IChunkWrapper;
 import com.seibel.distanthorizons.coreapi.DependencyInjection.ApiEventInjector;
 import org.apache.logging.log4j.Logger;
@@ -83,7 +86,7 @@ public abstract class AbstractDhLevel implements IDhLevel
 		ChunkHashRepo newChunkHashRepo = null;
 		try
 		{
-			newChunkHashRepo = new ChunkHashRepo("jdbc:sqlite", databaseFile);
+			newChunkHashRepo = new ChunkHashRepo(AbstractDhRepo.DEFAULT_DATABASE_TYPE, databaseFile);
 		}
 		catch (SQLException e)
 		{
@@ -96,7 +99,7 @@ public abstract class AbstractDhLevel implements IDhLevel
 		BeaconBeamRepo newBeaconBeamRepo = null;
 		try
 		{
-			newBeaconBeamRepo = new BeaconBeamRepo("jdbc:sqlite", databaseFile);
+			newBeaconBeamRepo = new BeaconBeamRepo(AbstractDhRepo.DEFAULT_DATABASE_TYPE, databaseFile);
 		}
 		catch (SQLException e)
 		{
@@ -168,6 +171,12 @@ public abstract class AbstractDhLevel implements IDhLevel
 	
 	private void onDataSourceSave(FullDataSourceV2 fullDataSource)
 	{
+		// block lights should have been populated at the chunkWrapper stage
+		// waiting to populate the data source's skylight at this stage prevents re-lighting and
+		// allows us to reduce cross-chunk lighting issues by lighting the whole 4x4 LOD at once 
+		DhLightingEngine.INSTANCE.bakeDataSourceSkyLight(fullDataSource, this.hasSkyLight() ? LodUtil.MAX_MC_LIGHT : LodUtil.MIN_MC_LIGHT);
+		
+		
 		this.updateDataSourcesAsync(fullDataSource).thenRun(() -> 
 		{
 			HashSet<DhChunkPos> updatedChunkPosSet = this.updatedChunkPosSetBySectionPos.remove(fullDataSource.getPos());
@@ -0,0 +1,509 @@
+package com.seibel.distanthorizons.core.level;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
+import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
+import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
+import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
+import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.multiplayer.server.ServerPlayerState;
+import com.seibel.distanthorizons.core.multiplayer.server.ServerPlayerStateManager;
+import com.seibel.distanthorizons.core.network.exceptions.InvalidLevelException;
+import com.seibel.distanthorizons.core.network.exceptions.RequestRejectedException;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
+import com.seibel.distanthorizons.core.network.messages.ILevelRelatedMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPartialUpdateMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPayload;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceResponseMessage;
+import com.seibel.distanthorizons.core.network.messages.requests.CancelMessage;
+import com.seibel.distanthorizons.core.pos.DhSectionPos;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import com.seibel.distanthorizons.core.util.math.Vec3d;
+import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import javax.annotation.CheckForNull;
+import javax.annotation.Nullable;
+import java.util.Map;
+import java.util.concurrent.*;
+
+public abstract class AbstractDhServerLevel extends AbstractDhLevel implements IDhServerLevel
+{
+	protected static final Logger LOGGER = DhLoggerBuilder.getLogger();
+	private static final ConfigBasedLogger NETWORK_LOGGER = new ConfigBasedLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get());
+	
+	/** 1 Mebibyte minus 576 bytes for other info */
+	public static final int FULL_DATA_SPLIT_SIZE_IN_BYTES = 1_048_000;
+	
+	public final ServerLevelModule serverside;
+	protected final IServerLevelWrapper serverLevelWrapper;
+	
+	protected final ServerPlayerStateManager serverPlayerStateManager;
+	
+	/**
+	 * This queue is used for ensuring fair generation speed for each player. <br>
+	 * Every tick the first player gets used for centering generation, and then is immediately moved into the back of the queue. <br>
+	 * TODO only add players that actually have something to generate
+	 */
+	protected final ConcurrentLinkedQueue<IServerPlayerWrapper> worldGenPlayerCenteringQueue = new ConcurrentLinkedQueue<>();
+	
+	private final ConcurrentMap<Long, DataSourceRequestGroup> requestGroupByPos = new ConcurrentHashMap<>();
+	private final ConcurrentMap<Long, DataSourceRequestGroup> requestGroupByFutureId = new ConcurrentHashMap<>();
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public AbstractDhServerLevel(AbstractSaveStructure saveStructure, IServerLevelWrapper serverLevelWrapper, ServerPlayerStateManager serverPlayerStateManager)
+	{
+		this(saveStructure, serverLevelWrapper, serverPlayerStateManager, true);
+	}
+	public AbstractDhServerLevel(
+			AbstractSaveStructure saveStructure,
+			IServerLevelWrapper serverLevelWrapper,
+			ServerPlayerStateManager serverPlayerStateManager,
+			boolean runRepoReliantSetup
+	)
+	{
+		if (saveStructure.getFullDataFolder(serverLevelWrapper).mkdirs())
+		{
+			LOGGER.warn("unable to create data folder.");
+		}
+		this.serverLevelWrapper = serverLevelWrapper;
+		this.serverside = new ServerLevelModule(this, saveStructure);
+		this.createAndSetSupportingRepos(this.serverside.fullDataFileHandler.repo.databaseFile);
+		if (runRepoReliantSetup)
+		{
+			this.runRepoReliantSetup();
+		}
+		
+		LOGGER.info("Started ${this.getClass().getSimpleName()} for $serverLevelWrapper at $saveStructure.");
+		
+		this.serverPlayerStateManager = serverPlayerStateManager;
+	}
+	
+	
+	
+	//=======//
+	// ticks //
+	//=======//
+	
+	@Override
+	public void serverTick()
+	{
+		// Send finished data source requests
+		for (Map.Entry<Long, DataSourceRequestGroup> entry : this.requestGroupByPos.entrySet())
+		{
+			DataSourceRequestGroup requestGroup = entry.getValue();
+			
+			if (requestGroup.fullDataSource == null)
+			{
+				continue;
+			}
+			
+			NETWORK_LOGGER.debug("[${this.serverLevelWrapper.getDimensionName()}] Fulfilled request group [${entry.getKey()}]");
+			
+			// Make this group unavailable for adding into
+			this.requestGroupByPos.remove(entry.getKey());
+			requestGroup.requestRemoveSemaphore.acquireUninterruptibly(Short.MAX_VALUE);
+			requestGroup.requestAddSemaphore.acquireUninterruptibly(Short.MAX_VALUE);
+			
+			ThreadPoolExecutor executor = ThreadPoolUtil.getNetworkCompressionExecutor();
+			if (executor == null)
+			{
+				LOGGER.warn("Unable to send FullDataSourceResponseMessage - getNetworkCompressionExecutor() is null");
+				continue;
+			}
+			CompletableFuture.runAsync(() ->
+			{
+				FullDataPayload payload = new FullDataPayload(requestGroup.fullDataSource);
+				for (FullDataSourceRequestMessage msg : requestGroup.requestMessages.values())
+				{
+					this.requestGroupByFutureId.remove(msg.futureId);
+					
+					ServerPlayerState serverPlayerState = this.serverPlayerStateManager.getConnectedPlayer(msg.serverPlayer());
+					if (serverPlayerState == null)
+					{
+						continue;
+					}
+					
+					serverPlayerState.getRateLimiterSet(this).generationRequestRateLimiter.release();
+					payload.splitAndSend(FULL_DATA_SPLIT_SIZE_IN_BYTES, msg.getSession()::sendMessage);
+					msg.sendResponse(new FullDataSourceResponseMessage(payload));
+				}
+			}, executor);
+		}
+	}
+	
+	@Override
+	public boolean shouldDoWorldGen()
+	{
+		return Config.Client.Advanced.WorldGenerator.enableDistantGeneration.get() && !this.worldGenPlayerCenteringQueue.isEmpty();
+	}
+	
+	@Override
+	@Nullable
+	public DhBlockPos2D getTargetPosForGeneration()
+	{
+		IServerPlayerWrapper firstPlayer = this.worldGenPlayerCenteringQueue.peek();
+		if (firstPlayer == null)
+		{
+			return null;
+		}
+		
+		// Put first player in back before removing from front, so it can be removed by other thread without blocking
+		// - if it gets removed, remove() below will remove the item we just put instead
+		this.worldGenPlayerCenteringQueue.add(firstPlayer);
+		this.worldGenPlayerCenteringQueue.remove(firstPlayer);
+		
+		Vec3d position = firstPlayer.getPosition();
+		return new DhBlockPos2D((int) position.x, (int) position.z);
+	}
+	
+	@Override public void worldGenTick()
+	{
+		this.serverside.worldGenModule.worldGenTick();
+	}
+	
+	
+	
+	//==================//
+	// network handling //
+	//==================//
+	
+	public void registerNetworkHandlers(ServerPlayerState serverPlayerState)
+	{
+		serverPlayerState.networkSession.registerHandler(FullDataSourceRequestMessage.class, (message) ->
+		{
+			if (!this.messagePlayerInThisLevel(message))
+			{
+				// we can't handle players in other levels, don't continue
+				return;
+			}
+			
+			
+			ServerPlayerState.RateLimiterSet rateLimiterSet = serverPlayerState.getRateLimiterSet(this);
+			
+			if (message.clientTimestamp == null)
+			{
+				this.queueWorldGenForRequestMessage(serverPlayerState, message, rateLimiterSet);
+			}
+			else
+			{
+				this.queueLodSyncForRequestMessage(serverPlayerState, message, rateLimiterSet);
+			}
+		});
+		
+		
+		serverPlayerState.networkSession.registerHandler(CancelMessage.class, msg ->
+		{
+			DataSourceRequestGroup requestGroup = this.requestGroupByFutureId.remove(msg.futureId);
+			if (requestGroup == null)
+			{
+				return;
+			}
+			
+			// If this fails, the group is being removed and completing cancellation is not necessary
+			if (requestGroup.requestRemoveSemaphore.tryAcquire())
+			{
+				// Prevent adding requests in case the group will be removed by this cancellation
+				requestGroup.requestAddSemaphore.acquireUninterruptibly(Short.MAX_VALUE);
+				requestGroup.requestRemoveSemaphore.release();
+				
+				serverPlayerState.getRateLimiterSet(this).generationRequestRateLimiter.release();
+				
+				FullDataSourceRequestMessage requestMessage = requestGroup.requestMessages.remove(msg.futureId);
+				if (requestGroup.requestMessages.isEmpty())
+				{
+					NETWORK_LOGGER.debug("[${this.serverLevelWrapper.getDimensionName()}] Cancelled request group [${DhSectionPos.toString(requestMessage.sectionPos)}].");
+					this.requestGroupByPos.remove(requestMessage.sectionPos);
+					this.serverside.fullDataFileHandler.removeRetrievalRequestIf(pos -> pos == requestMessage.sectionPos);
+				}
+				else
+				{
+					requestGroup.requestAddSemaphore.release(Short.MAX_VALUE);
+				}
+			}
+		});
+	}
+	private void queueLodSyncForRequestMessage(ServerPlayerState serverPlayerState, FullDataSourceRequestMessage message, ServerPlayerState.RateLimiterSet rateLimiterSet)
+	{
+		if (!serverPlayerState.sessionConfig.getSynchronizeOnLogin())
+		{
+			message.sendResponse(new RequestRejectedException("Operation is disabled in config."));
+			return;
+		}
+		
+		if (!rateLimiterSet.syncOnLoginRateLimiter.tryAcquire(message))
+		{
+			return;
+		}
+		
+		
+		// the client timestamp will be null if we want to retrieve the LOD regardless of when it was last updated
+		long clientTimestamp = (message.clientTimestamp != null) ? message.clientTimestamp : -1;
+		// the server timestamp will be null if no LOD data exists for this position
+		Long serverTimestamp = this.serverside.fullDataFileHandler.getTimestampForPos(message.sectionPos);
+		if (serverTimestamp == null
+				|| serverTimestamp <= clientTimestamp)
+		{
+			// either no data exists to sync, or the client is already up to date
+			rateLimiterSet.syncOnLoginRateLimiter.release();
+			message.sendResponse(new FullDataSourceResponseMessage(null));
+			return;
+		}
+		
+		
+		
+		ThreadPoolExecutor executor = ThreadPoolUtil.getNetworkCompressionExecutor();
+		if (executor == null)
+		{
+			// shouldn't normally happen, but just in case
+			LOGGER.warn("Unable to send FullDataSourceResponseMessage - getNetworkCompressionExecutor() is null");
+			return;
+		}
+		
+		this.serverside.fullDataFileHandler.getAsync(message.sectionPos).thenAcceptAsync(fullDataSource ->
+		{
+			rateLimiterSet.syncOnLoginRateLimiter.release();
+			
+			FullDataPayload payload = new FullDataPayload(fullDataSource);
+			payload.splitAndSend(FULL_DATA_SPLIT_SIZE_IN_BYTES, message.getSession()::sendMessage);
+			message.sendResponse(new FullDataSourceResponseMessage(payload));
+		}, executor);
+	}
+	private void queueWorldGenForRequestMessage(ServerPlayerState serverPlayerState, FullDataSourceRequestMessage message, ServerPlayerState.RateLimiterSet rateLimiterSet)
+	{
+		if (!serverPlayerState.sessionConfig.isDistantGenerationEnabled())
+		{
+			message.sendResponse(new RequestRejectedException("Operation is disabled in config."));
+			return;
+		}
+		
+		if (!rateLimiterSet.generationRequestRateLimiter.tryAcquire(message))
+		{
+			return;
+		}
+		
+		while (true)
+		{
+			DataSourceRequestGroup requestGroup = this.requestGroupByPos.computeIfAbsent(message.sectionPos, pos ->
+			{
+				DataSourceRequestGroup newGroup = new DataSourceRequestGroup();
+				this.tryFulfillDataSourceRequestGroup(newGroup, pos);
+				NETWORK_LOGGER.debug("[${serverLevelWrapper.getDimensionName()}] Created request group for pos [${DhSectionPos.toString(pos)}].");
+				return newGroup;
+			});
+			
+			// If this fails, loop until either a permit is acquired or the group is removed to create another one
+			if (!requestGroup.requestAddSemaphore.tryAcquire())
+			{
+				Thread.yield();
+				continue;
+			}
+			
+			this.requestGroupByFutureId.put(message.futureId, requestGroup);
+			requestGroup.requestMessages.put(message.futureId, message);
+			requestGroup.requestAddSemaphore.release();
+			break;
+		}
+	}
+	
+	
+	/** May send an error message in response if the message is a {@link AbstractTrackableMessage} */
+	private <T extends AbstractNetworkMessage> boolean messagePlayerInThisLevel(T message)
+	{
+		if (!(message instanceof ILevelRelatedMessage))
+		{
+			LodUtil.assertNotReach("Received message [$message] does not implement [${ILevelRelatedMessage.class.getSimpleName()}]");
+		}
+		
+		// Only handle requests for this level
+		if (!((ILevelRelatedMessage) message).isSameLevelAs(this.getServerLevelWrapper()))
+		{
+			return false;
+		}
+		
+		LodUtil.assertTrue(message.getSession().serverPlayer != null);
+		
+		// Check if the player is in this dimension,
+		// since handling multiple dimensions isn't allowed
+		if (message.getSession().serverPlayer.getLevel() != this.getLevelWrapper())
+		{
+			// If the message can be replied to - reply with an error, otherwise just ignore
+			if (message instanceof AbstractTrackableMessage)
+			{
+				((AbstractTrackableMessage) message).sendResponse(
+						new InvalidLevelException(
+								"Generation not allowed. " +
+										"Requested dimension: [${((ILevelRelatedMessage) message).getLevelName()}], " +
+										"player dimension: [${message.getSession().serverPlayer.getLevel().getDimensionName()}], " +
+										"handler dimension: [${this.getLevelWrapper().getDimensionName()}]"
+						)
+				);
+			}
+			
+			return false;
+		}
+		
+		
+		return true;
+	}
+	
+	
+	
+	//===========//
+	// world gen //
+	//===========//
+	
+	@Override
+	public void onWorldGenTaskComplete(long pos)
+	{
+		DataSourceRequestGroup requestGroup = this.requestGroupByPos.get(pos);
+		if (requestGroup != null)
+		{
+			this.tryFulfillDataSourceRequestGroup(requestGroup, pos);
+		}
+	}
+	
+	private void tryFulfillDataSourceRequestGroup(DataSourceRequestGroup requestGroup, long pos)
+	{
+		this.serverside.fullDataFileHandler.getAsync(pos).thenAccept(fullDataSource ->
+		{
+			if (this.serverside.fullDataFileHandler.isFullyGenerated(fullDataSource.columnGenerationSteps))
+			{
+				requestGroup.fullDataSource = fullDataSource;
+			}
+			else
+			{
+				this.serverside.fullDataFileHandler.queuePositionForRetrieval(pos);
+			}
+		});
+	}
+	
+	
+	
+	//=================//
+	// player handling //
+	//=================//
+	
+	public void addPlayer(IServerPlayerWrapper serverPlayer) { this.worldGenPlayerCenteringQueue.add(serverPlayer); }
+	public void removePlayer(IServerPlayerWrapper serverPlayer) { this.worldGenPlayerCenteringQueue.remove(serverPlayer); }
+	
+	@Override
+	public CompletableFuture<Void> updateDataSourcesAsync(FullDataSourceV2 data)
+	{
+		if (!Config.Client.Advanced.Multiplayer.ServerNetworking.enableRealTimeUpdates.get())
+		{
+			return this.getFullDataProvider().updateDataSourceAsync(data);
+		}
+		
+		ThreadPoolExecutor executor = ThreadPoolUtil.getNetworkCompressionExecutor();
+		if (executor == null)
+		{
+			LOGGER.warn("Unable to send FullDataPartialUpdateMessage - getNetworkCompressionExecutor() is null");
+			return this.getFullDataProvider().updateDataSourceAsync(data);
+		}
+		CompletableFuture.runAsync(() ->
+		{
+			FullDataPayload payload = new FullDataPayload(data);
+			for (ServerPlayerState serverPlayerState : this.serverPlayerStateManager.getConnectedPlayers())
+			{
+				if (serverPlayerState.getServerPlayer().getLevel() != this.serverLevelWrapper)
+				{
+					continue;
+				}
+				
+				if (!serverPlayerState.sessionConfig.isRealTimeUpdatesEnabled())
+				{
+					continue;
+				}
+				
+				Vec3d playerPosition = serverPlayerState.getServerPlayer().getPosition();
+				int distanceFromPlayer = DhSectionPos.getManhattanBlockDistance(data.getPos(), new DhBlockPos2D((int) playerPosition.x, (int) playerPosition.z)) / 16;
+				if (distanceFromPlayer >= serverPlayerState.getServerPlayer().getViewDistance()
+						&& distanceFromPlayer <= serverPlayerState.sessionConfig.getRenderDistanceRadius())
+				{
+					payload.splitAndSend(FULL_DATA_SPLIT_SIZE_IN_BYTES, serverPlayerState.networkSession::sendMessage);
+					serverPlayerState.networkSession.sendMessage(new FullDataPartialUpdateMessage(this.serverLevelWrapper, payload));
+				}
+			}
+		}, executor);
+		
+		
+		return this.getFullDataProvider().updateDataSourceAsync(data);
+	}
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
+	
+	@Override
+	public int getMinY() { return this.getLevelWrapper().getMinHeight(); }
+	
+	@Override
+	public IServerLevelWrapper getServerLevelWrapper() { return this.serverLevelWrapper; }
+	
+	@Override
+	public ILevelWrapper getLevelWrapper() { return this.getServerLevelWrapper(); }
+	
+	@Override
+	public FullDataSourceProviderV2 getFullDataProvider() { return this.serverside.fullDataFileHandler; }
+	
+	@Override
+	public AbstractSaveStructure getSaveStructure() { return this.serverside.saveStructure; }
+	
+	@Override
+	public boolean hasSkyLight() { return this.serverLevelWrapper.hasSkyLight(); }
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		super.close();
+		this.serverside.close();
+		LOGGER.info("Closed DHLevel for [" + this.getLevelWrapper() + "].");
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	private static class DataSourceRequestGroup
+	{
+		public final ConcurrentMap<Long, FullDataSourceRequestMessage> requestMessages = new ConcurrentHashMap<>();
+		
+		@CheckForNull
+		public FullDataSourceV2 fullDataSource;
+		
+		/**
+		 * These two Semaphores are used to prevent all threads from locking on the group after it being fulfilled,
+		 * as opposed to ReentrantReadWriteLocks which would allow the locking thread continue using it anyway. <br>
+		 * Short.MAX_VALUE is chosen as a large enough number so non-exclusive accesses never block each other.
+		 */
+		public final Semaphore requestAddSemaphore = new Semaphore(Short.MAX_VALUE, true);
+		/** @see DataSourceRequestGroup#requestAddSemaphore */
+		public final Semaphore requestRemoveSemaphore = new Semaphore(Short.MAX_VALUE, true);
+		
+	}
+	
+}
@@ -20,15 +20,27 @@
 package com.seibel.distanthorizons.core.level;

 import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiRenderParam;
+import com.seibel.distanthorizons.core.config.AppliedConfigState;
+import com.seibel.distanthorizons.core.config.Config;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
+import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
 import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
 import com.seibel.distanthorizons.core.file.fullDatafile.RemoteFullDataSourceProvider;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
+import com.seibel.distanthorizons.core.generation.RemoteWorldRetrievalQueue;
 import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.multiplayer.client.ClientNetworkState;
+import com.seibel.distanthorizons.core.multiplayer.client.SyncOnLoginRequestQueue;
+import com.seibel.distanthorizons.core.network.event.ScopedNetworkEventSource;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPartialUpdateMessage;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
+import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IProfilerWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IBiomeWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
@@ -36,33 +48,69 @@ import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import org.apache.logging.log4j.Logger;
 import org.jetbrains.annotations.Nullable;

+import javax.annotation.CheckForNull;
+import java.awt.*;
 import java.io.File;
 import java.util.List;
+import java.util.Optional;
 import java.util.concurrent.CompletableFuture;

 /** The level used when connected to a server */
 public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 {
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
 	
 	public final ClientLevelModule clientside;
 	public final IClientLevelWrapper levelWrapper;
 	public final AbstractSaveStructure saveStructure;
 	public final RemoteFullDataSourceProvider dataFileHandler;
 	
+	@CheckForNull
+	private final ClientNetworkState networkState;
+	@Nullable
+	private final ScopedNetworkEventSource networkEventSource;
+	
+	public final WorldGenModule worldGenModule;
+	public final AppliedConfigState<Boolean> worldGeneratorEnabledConfig;
+	
+	@Nullable
+	private final SyncOnLoginRequestQueue syncOnLoginRequestQueue;
+	
 	
 	
 	//=============//
 	// constructor //
 	//=============//
 	
-	public DhClientLevel(AbstractSaveStructure saveStructure, IClientLevelWrapper clientLevelWrapper) { this(saveStructure, clientLevelWrapper, null, true); }
-	public DhClientLevel(AbstractSaveStructure saveStructure, IClientLevelWrapper clientLevelWrapper, @Nullable File fullDataSaveDirOverride, boolean enableRendering)
+	public DhClientLevel(AbstractSaveStructure saveStructure, IClientLevelWrapper clientLevelWrapper, @Nullable ClientNetworkState networkState) { this(saveStructure, clientLevelWrapper, null, true, networkState); }
+	public DhClientLevel(AbstractSaveStructure saveStructure, IClientLevelWrapper clientLevelWrapper, @Nullable File fullDataSaveDirOverride, boolean enableRendering, @Nullable ClientNetworkState networkState)
 	{
+		if (saveStructure.getFullDataFolder(clientLevelWrapper).mkdirs())
+		{
+			LOGGER.warn("unable to create data folder.");
+		}
 		this.levelWrapper = clientLevelWrapper;
 		this.levelWrapper.setParentLevel(this);
 		this.saveStructure = saveStructure;
-		this.dataFileHandler = new RemoteFullDataSourceProvider(this, saveStructure, fullDataSaveDirOverride);
+		
+		this.networkState = networkState;
+		if (this.networkState != null)
+		{
+			this.networkEventSource = new ScopedNetworkEventSource(this.networkState.getSession());
+			this.syncOnLoginRequestQueue = new SyncOnLoginRequestQueue(this, this.networkState);
+			this.registerNetworkHandlers();
+		}
+		else
+		{
+			this.networkEventSource = null;
+			this.syncOnLoginRequestQueue = null;
+		}
+		
+		this.dataFileHandler = new RemoteFullDataSourceProvider(this, saveStructure, fullDataSaveDirOverride, this.syncOnLoginRequestQueue);
+		this.worldGeneratorEnabledConfig = new AppliedConfigState<>(Config.Client.Advanced.WorldGenerator.enableDistantGeneration);
+		this.worldGenModule = new WorldGenModule(this, this.dataFileHandler, () -> new WorldGenState(this, networkState));
+		
 		this.clientside = new ClientLevelModule(this);
 		
 		this.createAndSetSupportingRepos(this.dataFileHandler.repo.databaseFile);
@@ -74,6 +122,30 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 			LOGGER.info("Started DHLevel for " + this.levelWrapper + " with saves at " + this.saveStructure);
 		}
 	}
+	private void registerNetworkHandlers()
+	{
+		assert this.networkEventSource != null;
+		assert this.networkState != null;
+		
+		this.networkEventSource.registerHandler(FullDataPartialUpdateMessage.class, message ->
+		{
+			try
+			{
+				FullDataSourceV2DTO dataSourceDto = this.networkState.decodeDataSourceAndReleaseBuffer(message.payload);
+				
+				if (!message.isSameLevelAs(this.levelWrapper))
+				{
+					return;
+				}
+				
+				this.updateDataSourcesAsync(dataSourceDto.createPooledDataSource(this.levelWrapper));
+			}
+			catch (Exception e)
+			{
+				LOGGER.error("Error while updating full data source", e);
+			}
+		});
+	}
 	
 	
 	
@@ -87,6 +159,11 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 		try
 		{
 			this.clientside.clientTick();
+			
+			if (this.syncOnLoginRequestQueue != null)
+			{
+				this.syncOnLoginRequestQueue.tick(new DhBlockPos2D(MC_CLIENT.getPlayerBlockPos()));
+			}
 		}
 		catch (Exception e)
 		{
@@ -94,6 +171,43 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 		}
 	}
 	
+	@Override
+	public boolean shouldDoWorldGen()
+	{
+		ClientNetworkState networkState = this.networkState;
+		
+		boolean isClientUsable = false, isAllowedDimension = false;
+		if (networkState != null)
+		{
+			isClientUsable = networkState.isReady();
+			isAllowedDimension = MC_CLIENT.getWrappedClientLevel() == this.levelWrapper;
+		}
+		
+		return isClientUsable
+				&& networkState.sessionConfig.isDistantGenerationEnabled()
+				&& isAllowedDimension
+				&& this.clientside.isRendering();
+	}
+	
+	@Override
+	@Nullable
+	public DhBlockPos2D getTargetPosForGeneration()
+	{
+		return new DhBlockPos2D(MC_CLIENT.getPlayerBlockPos());
+	}
+	
+	@Override
+	public void worldGenTick()
+	{
+		this.worldGenModule.worldGenTick();
+	}
+	
+	
+	
+	//===========//
+	// rendering //
+	//===========//
+	
 	@Override
 	public void render(DhApiRenderParam renderEventParam, IProfilerWrapper profiler)
 	{ this.clientside.render(renderEventParam, profiler); }
@@ -104,9 +218,28 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 	
 	
 	
-	//================//
-	// level handling //
-	//================//
+	//===========//
+	// world gen //
+	//===========//
+	
+	@Override
+	public void onWorldGenTaskComplete(long pos)
+	{
+		DebugRenderer.makeParticle(
+				new DebugRenderer.BoxParticle(
+						new DebugRenderer.Box(pos, 128f, 156f, 0.09f, Color.red.darker()),
+						0.2, 32f
+				)
+		);
+		
+		this.clientside.reloadPos(pos);
+	}
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
 	
 	@Override
 	public int computeBaseColor(DhBlockPos pos, IBiomeWrapper biome, IBlockStateWrapper block) { return this.levelWrapper.getBlockColor(pos, biome, block); }
@@ -126,10 +259,34 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 	@Override
 	public int getMinY() { return this.levelWrapper.getMinHeight(); }
 	
+	@Override
+	public FullDataSourceProviderV2 getFullDataProvider() { return this.dataFileHandler; }
+	
+	@Override
+	public AbstractSaveStructure getSaveStructure() { return this.saveStructure; }
+	
+	@Override
+	public boolean hasSkyLight() { return this.levelWrapper.hasSkyLight(); }
+	
+	@Override
+	public GenericObjectRenderer getGenericRenderer() { return this.clientside.genericRenderer; }
+	@Override
+	public RenderBufferHandler getRenderBufferHandler()
+	{
+		ClientLevelModule.ClientRenderState renderState = this.clientside.ClientRenderStateRef.get();
+		return (renderState != null) ? renderState.renderBufferHandler : null;
+	}
+	
+	
+	
+	//===========//
+	// debugging //
+	//===========//
+	
 	@Override
 	public void addDebugMenuStringsToList(List<String> messageList)
 	{
-		String dimName = this.levelWrapper.getDimensionType().getDimensionName();
+		String dimName = this.levelWrapper.getDimensionName();
 		boolean rendering = this.clientside.isRendering();
 		messageList.add("["+dimName+"] rendering: "+(rendering ? "yes" : "no"));
 		
@@ -152,11 +309,39 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 		{
 			messageList.add("  Migration Failed");
 		}
+		
+		
+		// world gen
+		this.worldGenModule.addDebugMenuStringsToList(messageList);
+		if (this.syncOnLoginRequestQueue != null)
+		{
+			assert this.networkState != null;
+			if (this.networkState.sessionConfig.getSynchronizeOnLogin())
+			{
+				this.syncOnLoginRequestQueue.addDebugMenuStringsToList(messageList);
 			}
+		}
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
 	
 	@Override
 	public void close()
 	{
+		if (this.worldGenModule != null)
+		{
+			this.worldGenModule.close();
+		}
+		
+		if (this.networkEventSource != null)
+		{
+			this.networkEventSource.close();
+		}
+		
 		this.levelWrapper.setParentLevel(null);
 		this.clientside.close();
 		super.close();
@@ -164,23 +349,18 @@ public class DhClientLevel extends AbstractDhLevel implements IDhClientLevel
 		LOGGER.info("Closed [" + DhClientLevel.class.getSimpleName() + "] for [" + this.levelWrapper + "]");
 	}
 	
-	@Override
-	public FullDataSourceProviderV2 getFullDataProvider() { return this.dataFileHandler; }
-	
-	@Override
-	public AbstractSaveStructure getSaveStructure() { return this.saveStructure; }
-	
-	@Override
-	public boolean hasSkyLight() { return this.levelWrapper.hasSkyLight(); }
 	
 	
-	@Override
-	public GenericObjectRenderer getGenericRenderer() { return this.clientside.genericRenderer; }
-	@Override
-	public RenderBufferHandler getRenderBufferHandler()
+	//================//
+	// helper classes //
+	//================//
+	
+	private static class WorldGenState extends WorldGenModule.AbstractWorldGenState
 	{
-		ClientLevelModule.ClientRenderState renderState = this.clientside.ClientRenderStateRef.get();
-		return (renderState != null) ? renderState.renderBufferHandler : null;
+		WorldGenState(IDhClientLevel level, ClientNetworkState networkState)
+		{
+			this.worldGenerationQueue = new RemoteWorldRetrievalQueue(networkState, level);
+		}
 	}
 	
 }
@@ -22,59 +22,44 @@ package com.seibel.distanthorizons.core.level;
 import com.seibel.distanthorizons.api.methods.events.sharedParameterObjects.DhApiRenderParam;
 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
-import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
 import com.seibel.distanthorizons.core.logging.f3.F3Screen;
+import com.seibel.distanthorizons.core.multiplayer.server.ServerPlayerStateManager;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
-import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos;
-import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
 import com.seibel.distanthorizons.core.wrapperInterfaces.block.IBlockStateWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IProfilerWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IBiomeWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
-import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
-import org.apache.logging.log4j.Logger;

 import java.awt.*;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;

 /** The level used on a singleplayer world */
-public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLevel, IDhServerLevel
+public class DhClientServerLevel extends AbstractDhServerLevel implements IDhClientLevel
 {
-	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
 	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
 	
-	public final ServerLevelModule serverside;
 	public final ClientLevelModule clientside;
 	
-	private final IServerLevelWrapper serverLevelWrapper;
-	
 	
 	
 	//=============//
 	// constructor //
 	//=============//
 	
-	public DhClientServerLevel(AbstractSaveStructure saveStructure, IServerLevelWrapper serverLevelWrapper)
+	public DhClientServerLevel(AbstractSaveStructure saveStructure, IServerLevelWrapper serverLevelWrapper, ServerPlayerStateManager serverPlayerStateManager)
 	{
-		if (saveStructure.getFullDataFolder(serverLevelWrapper).mkdirs())
-		{
-			LOGGER.warn("unable to create data folder.");
-		}
-		this.serverLevelWrapper = serverLevelWrapper;
-		this.serverLevelWrapper.setParentLevel(this);
-		this.serverside = new ServerLevelModule(this, saveStructure);
-		this.clientside = new ClientLevelModule(this);
-		this.createAndSetSupportingRepos(this.serverside.fullDataFileHandler.repo.databaseFile);
-		this.runRepoReliantSetup();
+		super(saveStructure, serverLevelWrapper, serverPlayerStateManager, false);
 		
-		LOGGER.info("Started " + DhClientServerLevel.class.getSimpleName() + " for " + serverLevelWrapper + " with saves at " + saveStructure);
+		this.serverLevelWrapper.setParentLevel(this);
+		this.clientside = new ClientLevelModule(this);
+		this.runRepoReliantSetup();
 	}
 	
 	
@@ -94,34 +79,6 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 	public void renderDeferred(DhApiRenderParam renderEventParam, IProfilerWrapper profiler)
 	{ this.clientside.renderDeferred(renderEventParam, profiler); }
 	
-	@Override
-	public void serverTick() {  }
-	
-	@Override
-	public void doWorldGen()
-	{
-		this.serverside.worldGeneratorEnabledConfig.pollNewValue(); // if not called the get() line below may not 
-		boolean shouldDoWorldGen = this.serverside.worldGeneratorEnabledConfig.get() && this.clientside.isRendering();
-		boolean isWorldGenRunning = this.serverside.worldGenModule.isWorldGenRunning();
-		if (shouldDoWorldGen && !isWorldGenRunning)
-		{
-			// start world gen
-			this.serverside.worldGenModule.startWorldGen(this.serverside.fullDataFileHandler, new ServerLevelModule.WorldGenState(this));
-		}
-		else if (!shouldDoWorldGen && isWorldGenRunning)
-		{
-			// stop world gen
-			this.serverside.worldGenModule.stopWorldGen(this.serverside.fullDataFileHandler);
-		}
-		
-		if (isWorldGenRunning)
-		{
-			this.serverside.worldGenModule.worldGenTick(new DhBlockPos2D(MC_CLIENT.getPlayerBlockPos()));
-		}
-	}
-	
-	
-	
 	//========//
 	// render //
 	//========//
@@ -157,28 +114,14 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 	public void clearRenderCache() { this.clientside.clearRenderCache(); }
 	
 	@Override
-	public IServerLevelWrapper getServerLevelWrapper() { return serverLevelWrapper; }
-	@Override
-	public ILevelWrapper getLevelWrapper() { return getServerLevelWrapper(); }
-	
-	@Override
-	public FullDataSourceProviderV2 getFullDataProvider() { return this.serverside.fullDataFileHandler; }
-	
-	@Override
-	public AbstractSaveStructure getSaveStructure()
+	public CompletableFuture<Void> updateDataSourcesAsync(FullDataSourceV2 data)
 	{
-		return serverside.saveStructure;
+		return CompletableFuture.allOf(
+				super.updateDataSourcesAsync(data),
+				this.clientside.updateDataSourcesAsync(data)
+		);
 	}
 	
-	@Override
-	public boolean hasSkyLight() { return this.serverLevelWrapper.hasSkyLight(); }
-	
-	@Override
-	public CompletableFuture<Void> updateDataSourcesAsync(FullDataSourceV2 data) { return this.clientside.updateDataSourcesAsync(data); }
-	
-	@Override
-	public int getMinY() { return this.getLevelWrapper().getMinHeight(); }
-	
 	
 	
 	//===========//
@@ -189,7 +132,7 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 	public void addDebugMenuStringsToList(List<String> messageList)
 	{
 		// header
-		String dimName = this.serverLevelWrapper.getDimensionType().getDimensionName();
+		String dimName = this.serverLevelWrapper.getDimensionName();
 		boolean rendering = this.clientside.isRendering();
 		messageList.add("["+dimName+"] rendering: "+(rendering ? "yes" : "no"));
 		
@@ -216,12 +159,7 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 		
 		
 		// world gen
-		WorldGenModule worldGenState = this.serverside.worldGenModule;
-		String worldGenDisplayString = worldGenState.getDebugMenuString();
-		if (worldGenDisplayString != null)
-		{
-			messageList.add(worldGenDisplayString);
-		}
+		this.serverside.worldGenModule.addDebugMenuStringsToList(messageList);
 	}
 	
 	
@@ -252,6 +190,8 @@ public class DhClientServerLevel extends AbstractDhLevel implements IDhClientLev
 	@Override
 	public void onWorldGenTaskComplete(long pos)
 	{
+		super.onWorldGenTaskComplete(pos);
+		
 		DebugRenderer.makeParticle(
 				new DebugRenderer.BoxParticle(
 						new DebugRenderer.Box(pos, 128f, 156f, 0.09f, Color.red.darker()),
@@ -19,114 +19,43 @@

 package com.seibel.distanthorizons.core.level;

-import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
-import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
-import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
-import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
+import com.seibel.distanthorizons.core.multiplayer.server.ServerPlayerStateManager;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
-import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;
-import org.apache.logging.log4j.Logger;

 import java.util.List;
-import java.util.concurrent.CompletableFuture;

-public class DhServerLevel extends AbstractDhLevel implements IDhServerLevel
+public class DhServerLevel extends AbstractDhServerLevel
 {
-	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
-	public final ServerLevelModule serverside;
-	private final IServerLevelWrapper serverLevelWrapper;
-	
-	
-	
 	//=============//
 	// constructor //
 	//=============//
 	
-	public DhServerLevel(AbstractSaveStructure saveStructure, IServerLevelWrapper serverLevelWrapper)
+	public DhServerLevel(AbstractSaveStructure saveStructure, IServerLevelWrapper serverLevelWrapper, ServerPlayerStateManager serverPlayerStateManager)
 	{
-		if (saveStructure.getFullDataFolder(serverLevelWrapper).mkdirs())
-		{
-			LOGGER.warn("unable to create data folder.");
+		super(saveStructure, serverLevelWrapper, serverPlayerStateManager);
 	}
-		this.serverLevelWrapper = serverLevelWrapper;
-		this.serverside = new ServerLevelModule(this, saveStructure);
-		this.createAndSetSupportingRepos(this.serverside.fullDataFileHandler.repo.databaseFile);
-		this.runRepoReliantSetup();
 	
-		LOGGER.info("Started DHLevel for {} with saves at {}", serverLevelWrapper, saveStructure);
+	
+	
+	//=======//
+	// ticks //
+	//=======//
+	
+	@Override
+	public boolean shouldDoWorldGen()
+	{
+		return true; //todo;
 	}
 	
 	
 	
 	//=========//
-	// methods //
+	// getters //
 	//=========//
 	
-	public void serverTick() {  }
-	
-	@Override
-	public CompletableFuture<Void> updateDataSourcesAsync(FullDataSourceV2 data) { return this.getFullDataProvider().updateDataSourceAsync(data); }
-	
-	@Override
-	public int getMinY() { return getLevelWrapper().getMinHeight(); }
-	
-	@Override
-	public void close()
-	{
-		super.close();
-		serverside.close();
-		LOGGER.info("Closed DHLevel for {}", getLevelWrapper());
-	}
-	
-	@Override
-	public void doWorldGen()
-	{
-		boolean shouldDoWorldGen = true; //todo;
-		boolean isWorldGenRunning = serverside.worldGenModule.isWorldGenRunning();
-		if (shouldDoWorldGen && !isWorldGenRunning)
-		{
-			// start world gen
-			serverside.worldGenModule.startWorldGen(serverside.fullDataFileHandler, new ServerLevelModule.WorldGenState(this));
-		}
-		else if (!shouldDoWorldGen && isWorldGenRunning)
-		{
-			// stop world gen
-			serverside.worldGenModule.stopWorldGen(serverside.fullDataFileHandler);
-		}
-		
-		if (serverside.worldGenModule.isWorldGenRunning())
-		{
-			serverside.worldGenModule.worldGenTick(new DhBlockPos2D(0, 0)); // todo;
-		}
-	}
-	
-	@Override
-	public IServerLevelWrapper getServerLevelWrapper() { return serverLevelWrapper; }
-	
-	@Override
-	public ILevelWrapper getLevelWrapper() { return getServerLevelWrapper(); }
-	
-	@Override
-	public FullDataSourceProviderV2 getFullDataProvider() { return this.serverside.fullDataFileHandler; }
-	
-	@Override
-	public AbstractSaveStructure getSaveStructure()
-	{
-		return serverside.saveStructure;
-	}
-	
-	@Override
-	public boolean hasSkyLight() { return this.serverLevelWrapper.hasSkyLight(); }
-	
-	@Override
-	public void onWorldGenTaskComplete(long pos)
-	{
-		//TODO: Send packet to client
-	}
-	
 	@Override
 	public GenericObjectRenderer getGenericRenderer() 
 	{ 
@@ -141,6 +70,7 @@ public class DhServerLevel extends AbstractDhLevel implements IDhServerLevel
 	}
 	
 	
+	
 	//===========//
 	// debugging //
 	//===========//
@@ -148,8 +78,21 @@ public class DhServerLevel extends AbstractDhLevel implements IDhServerLevel
 	@Override
 	public void addDebugMenuStringsToList(List<String> messageList)
 	{
-		String dimName = this.serverLevelWrapper.getDimensionType().getDimensionName();
-		messageList.add("["+dimName+"]");
+		messageList.add("[${this.serverLevelWrapper.getDimensionName()}]");
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		super.close();
+		this.serverside.close();
+		LOGGER.info("Closed DHLevel for [${this.getLevelWrapper()}].");
 	}
 	
 }
@@ -21,6 +21,7 @@ package com.seibel.distanthorizons.core.level;

 import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
 import com.seibel.distanthorizons.core.file.fullDatafile.FullDataSourceProviderV2;
+import com.seibel.distanthorizons.core.file.fullDatafile.GeneratedFullDataSourceProvider;
 import com.seibel.distanthorizons.core.file.structure.AbstractSaveStructure;
 import com.seibel.distanthorizons.core.pos.DhChunkPos;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
@@ -33,8 +34,10 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;

-public interface IDhLevel extends AutoCloseable
+public interface IDhLevel extends AutoCloseable, GeneratedFullDataSourceProvider.IOnWorldGenCompleteListener
 {
+	void worldGenTick();
+	
 	int getMinY();
 	
 	/**
@@ -21,9 +21,10 @@ package com.seibel.distanthorizons.core.level;

 import com.seibel.distanthorizons.core.wrapperInterfaces.world.IServerLevelWrapper;

-public interface IDhServerLevel extends IDhWorldGenLevel
+public interface IDhServerLevel extends IDhLevel
 {
    void serverTick();
 	
    IServerLevelWrapper getServerLevelWrapper();
+	
 }
@@ -19,7 +19,7 @@

 package com.seibel.distanthorizons.core.level;

-import com.seibel.distanthorizons.core.wrapperInterfaces.world.ILevelWrapper;
+import com.seibel.distanthorizons.core.wrapperInterfaces.world.IClientLevelWrapper;
 import com.seibel.distanthorizons.coreapi.interfaces.dependencyInjection.IBindable;

 /**
@@ -28,15 +28,11 @@ import com.seibel.distanthorizons.coreapi.interfaces.dependencyInjection.IBindab
 */
 public interface IKeyedClientLevelManager extends IBindable
 {
+	IServerKeyedClientLevel getServerKeyedLevel();
 	/** Called when a client level is wrapped by a ServerEnhancedClientLevel, for integration into mod internals. */
-	void setServerKeyedLevel(IServerKeyedClientLevel clientLevel);
-	IServerKeyedClientLevel getOverrideWrapper();
+	IServerKeyedClientLevel setServerKeyedLevel(IClientLevelWrapper clientLevel, String levelKey);
 	
-	/** Returns a new instance of a ServerEnhancedClientLevel. */
-	IServerKeyedClientLevel getServerKeyedLevel(ILevelWrapper level, String serverLevelKey);
-	
-	/** Sets the LOD engine to use the override wrapper, if the server has communication enabled. */
-	void setUseOverrideWrapper(boolean useOverrideWrapper);
-	boolean getUseOverrideWrapper();
+	void clearKeyedLevel();
+	boolean hasLevelSet();
 	
 }
@@ -34,10 +34,9 @@ public class ServerLevelModule implements AutoCloseable
 {
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
 	
-	public final IDhServerLevel parentServerLevel;
+	private final IDhServerLevel parentServerLevel;
 	public final AbstractSaveStructure saveStructure;
 	public final GeneratedFullDataSourceProvider fullDataFileHandler;
-	public final AppliedConfigState<Boolean> worldGeneratorEnabledConfig;
 	
 	public final WorldGenModule worldGenModule;
 	
@@ -52,8 +51,7 @@ public class ServerLevelModule implements AutoCloseable
 		this.parentServerLevel = parentServerLevel;
 		this.saveStructure = saveStructure;
 		this.fullDataFileHandler = new GeneratedFullDataSourceProvider(parentServerLevel, saveStructure);
-		this.worldGeneratorEnabledConfig = new AppliedConfigState<>(Config.Client.Advanced.WorldGenerator.enableDistantGeneration);
-		this.worldGenModule = new WorldGenModule(this.parentServerLevel);
+		this.worldGenModule = new WorldGenModule(this.parentServerLevel, this.fullDataFileHandler, () -> new ServerLevelModule.WorldGenState(this.parentServerLevel));
 	}
 	
 	
@@ -25,17 +25,29 @@ import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
 import com.seibel.distanthorizons.core.logging.f3.F3Screen;
 import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
 import org.apache.logging.log4j.Logger;
+import org.jetbrains.annotations.Nullable;

 import java.io.Closeable;
+import java.util.List;
+import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.BooleanSupplier;
+import java.util.function.Supplier;

+/**
+ * Handles both single-player/server-side world gen and client side LOD requests.
+ * TODO rename
+ */
 public class WorldGenModule implements Closeable
 {
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
 	
 	private final GeneratedFullDataSourceProvider.IOnWorldGenCompleteListener onWorldGenCompleteListener;
 	
+	private final GeneratedFullDataSourceProvider dataSourceProvider;
+	private final Supplier<? extends AbstractWorldGenState> worldGenStateSupplier;
+	
 	private final AtomicReference<AbstractWorldGenState> worldGenStateRef = new AtomicReference<>();
 	
 	
@@ -44,9 +56,15 @@ public class WorldGenModule implements Closeable
 	// constructor //
 	//=============//
 	
-	public WorldGenModule(GeneratedFullDataSourceProvider.IOnWorldGenCompleteListener onWorldGenCompleteListener)
+	public WorldGenModule(
+			GeneratedFullDataSourceProvider.IOnWorldGenCompleteListener onWorldGenCompleteListener,
+			GeneratedFullDataSourceProvider dataSourceProvider,
+			Supplier<? extends AbstractWorldGenState> worldGenStateSupplier
+	)
 	{
 		this.onWorldGenCompleteListener = onWorldGenCompleteListener;
+		this.dataSourceProvider = dataSourceProvider;
+		this.worldGenStateSupplier = worldGenStateSupplier;
 	}
 	
 	
@@ -90,15 +108,35 @@ public class WorldGenModule implements Closeable
 		dataFileHandler.removeWorldGenCompleteListener(this.onWorldGenCompleteListener);
 	}
 	
-	/** @param targetPosForGeneration the position that world generation should be centered around */
-	public void worldGenTick(DhBlockPos2D targetPosForGeneration)
+	public void worldGenTick()
+	{
+		boolean shouldDoWorldGen = this.onWorldGenCompleteListener.shouldDoWorldGen();
+		
+		boolean isWorldGenRunning = this.isWorldGenRunning();
+		if (shouldDoWorldGen && !isWorldGenRunning)
+		{
+			// start world gen
+			this.startWorldGen(this.dataSourceProvider, this.worldGenStateSupplier.get());
+		}
+		else if (!shouldDoWorldGen && isWorldGenRunning)
+		{
+			// stop world gen
+			this.stopWorldGen(this.dataSourceProvider);
+		}
+		
+		if (this.isWorldGenRunning())
 		{
 			AbstractWorldGenState worldGenState = this.worldGenStateRef.get();
 			if (worldGenState != null)
+			{
+				DhBlockPos2D targetPosForGeneration = this.onWorldGenCompleteListener.getTargetPosForGeneration();
+				if (targetPosForGeneration != null)
 				{
 					worldGenState.startGenerationQueueAndSetTargetPos(targetPosForGeneration);
 				}
 			}
+		}
+	}
 	
 	
 	
@@ -137,20 +175,22 @@ public class WorldGenModule implements Closeable
 	
 	public boolean isWorldGenRunning() { return this.worldGenStateRef.get() != null; }
 	
-	public String getDebugMenuString()
+	/** mutates a list so it can be added to an existing {@link IDhLevel}'s debug list  */
+	public void addDebugMenuStringsToList(List<String> messageList)
 	{
 		AbstractWorldGenState worldGenState = this.worldGenStateRef.get();
 		if (worldGenState == null)
 		{
-			return null;
+			return;
 		}
 		
 		
 		String waitingCountStr = F3Screen.NUMBER_FORMAT.format(worldGenState.worldGenerationQueue.getWaitingTaskCount());
 		String inProgressCountStr = F3Screen.NUMBER_FORMAT.format(worldGenState.worldGenerationQueue.getInProgressTaskCount());
 		String totalCountEstimateStr = F3Screen.NUMBER_FORMAT.format(worldGenState.worldGenerationQueue.getEstimatedTotalTaskCount());
+		messageList.add("World Gen Tasks: "+waitingCountStr+"/"+totalCountEstimateStr+" (in progress: "+inProgressCountStr+")");

-		return "World Gen Tasks: "+waitingCountStr+"/"+totalCountEstimateStr+" (in progress: "+inProgressCountStr+")";
+		worldGenState.worldGenerationQueue.addDebugMenuStringsToList(messageList);
 	}
 	
 	
@@ -166,16 +206,16 @@ public class WorldGenModule implements Closeable
 		
 		CompletableFuture<Void> closeAsync(boolean doInterrupt)
 		{
-			return this.worldGenerationQueue.startClosing(true, doInterrupt)
-					.exceptionally(ex ->
+			return this.worldGenerationQueue.startClosingAsync(true, doInterrupt)
+				.exceptionally(e ->
 				{
-								LOGGER.error("Error closing generation queue", ex);
+					LOGGER.error("Error during first stage of generation queue shutdown, Error: ["+e.getMessage()+"].", e);
 					return null;
 				}
 				).thenRun(this.worldGenerationQueue::close)
-					.exceptionally(ex ->
+				.exceptionally(e ->
 				{
-						LOGGER.error("Error closing world gen", ex);
+					LOGGER.error("Error during second stage of generation queue shutdown, Error: ["+e.getMessage()+"].", e);
 					return null;
 				});
 		}
@@ -101,7 +101,8 @@ public class ConfigBasedLogger
 			else
 				logger.log(logLevel, msgStr);
 		}
-		if (mode.levelForChat.isLessSpecificThan(level))
+		
+		if (MC != null && mode.levelForChat.isLessSpecificThan(level))
 		{
 			if (param.length > 0 && param[param.length - 1] instanceof Throwable)
 				MC.logToChat(level, msgStr + "\n" +
@@ -20,12 +20,14 @@
 package com.seibel.distanthorizons.core.logging.f3;

 import com.seibel.distanthorizons.core.api.internal.SharedApi;
+import com.seibel.distanthorizons.core.jar.ModJarInfo;
 import com.seibel.distanthorizons.core.level.IDhLevel;
 import com.seibel.distanthorizons.core.render.RenderBufferHandler;
 import com.seibel.distanthorizons.core.render.renderer.generic.GenericObjectRenderer;
 import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
 import com.seibel.distanthorizons.core.world.AbstractDhWorld;
 import com.seibel.distanthorizons.coreapi.ModInfo;
+import com.seibel.distanthorizons.coreapi.util.StringUtil;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;

@@ -48,7 +50,8 @@ public class F3Screen
 	/**
 	 * F3 menu example: <br>
 	 <code>
-	 Distant Horizons v: 2.1.1-a-dev <br><br>
+	 Distant Horizons v: 2.1.1-a-dev <br> 
+	 Build: 7e163ce6 (main) <br><br>
 	 
 	 Queued chunk updates: 0 / 1000 <br>
 	 World Gen Tasks: 40/5304, (in progress: 7) <br><br>
@@ -60,9 +63,9 @@ public class F3Screen
 	 Parent Update #: 12 <br><br>
 	 
 	 Client_Server World with 3 levels <br>
-	 [overworld] rendering: Active <br>
-	 [the_end] rendering: Inactive <br>
-	 [the_nether] rendering: Inactive <br><br>
+	 [minecraft:overworld] rendering: Active <br>
+	 [minecraft:the_end] rendering: Inactive <br>
+	 [minecraft:the_nether] rendering: Inactive <br><br>
 	 
 	 VBO Render Count: 199/374 <br>
 	 </code>
@@ -82,6 +85,10 @@ public class F3Screen
 		
 		messageList.add("");
 		messageList.add(ModInfo.READABLE_NAME+": "+ModInfo.VERSION);
+		if (ModInfo.IS_DEV_BUILD)
+		{
+			messageList.add("Build: " + StringUtil.shortenString(ModJarInfo.Git_Commit, 8) + " (" + ModJarInfo.Git_Branch + ")");
+		}
 		messageList.add("");
 		// thread pools
 		messageList.add(getThreadPoolStatString("World Gen", worldGenPool));//"World Gen Tasks: 40/5304, (in progress: 7)");
@@ -95,7 +102,7 @@ public class F3Screen
 		messageList.add(SharedApi.INSTANCE.getDebugMenuString());
 		messageList.add("");
 		// world / levels
-		messageList.add(world.GetDebugMenuString());
+		world.addDebugMenuStringsToList(messageList);
 		for (IDhLevel level : levelIterator)
 		{
 			level.addDebugMenuStringsToList(messageList);
@@ -0,0 +1,415 @@
+package com.seibel.distanthorizons.core.multiplayer.client;
+
+import com.google.common.base.Stopwatch;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.config.types.ConfigEntry;
+import com.seibel.distanthorizons.core.dataObjects.fullData.sources.FullDataSourceV2;
+import com.seibel.distanthorizons.core.dependencyInjection.SingletonInjector;
+import com.seibel.distanthorizons.core.level.DhServerLevel;
+import com.seibel.distanthorizons.core.level.IDhClientLevel;
+import com.seibel.distanthorizons.core.logging.ConfigBasedSpamLogger;
+import com.seibel.distanthorizons.core.network.exceptions.InvalidLevelException;
+import com.seibel.distanthorizons.core.network.exceptions.RateLimitedException;
+import com.seibel.distanthorizons.core.network.exceptions.RequestRejectedException;
+import com.seibel.distanthorizons.core.network.session.SessionClosedException;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceResponseMessage;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+import com.seibel.distanthorizons.core.pos.DhSectionPos;
+import com.seibel.distanthorizons.core.render.renderer.DebugRenderer;
+import com.seibel.distanthorizons.core.render.renderer.IDebugRenderable;
+import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import com.seibel.distanthorizons.core.util.TimerUtil;
+import com.seibel.distanthorizons.core.util.objects.DataCorruptedException;
+import com.seibel.distanthorizons.core.util.ratelimiting.SupplierBasedRateLimiter;
+import com.seibel.distanthorizons.core.util.threading.ThreadPoolUtil;
+import com.seibel.distanthorizons.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
+import org.apache.logging.log4j.LogManager;
+
+import javax.annotation.CheckForNull;
+import javax.annotation.Nullable;
+import java.awt.*;
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.Timer;
+import java.util.TimerTask;
+import java.util.concurrent.*;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Consumer;
+
+public abstract class AbstractFullDataNetworkRequestQueue implements IDebugRenderable, AutoCloseable
+{
+	private static final ConfigBasedSpamLogger LOGGER = new ConfigBasedSpamLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get(), 3);
+	
+	private static final IMinecraftClientWrapper MC_CLIENT = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	
+	private static final Timer TASK_FINISH_TIMER = TimerUtil.CreateTimer("RequestTaskFinishTimer");
+	
+	private static final int MAX_RETRY_ATTEMPTS = 3;
+	
+	protected static final long SHUTDOWN_TIMEOUT_SECONDS = 5;
+	
+	
+	
+	public final ClientNetworkState networkState;
+	protected final IDhClientLevel level;
+	private final boolean changedOnly;
+	
+	private volatile CompletableFuture<Void> closingFuture = null;
+	
+	protected final ConcurrentMap<Long, RequestQueueEntry> waitingTasksBySectionPos = new ConcurrentHashMap<>();
+	/**
+	 * This semaphore prevents a given thread from accidentally locking on the same group
+	 * multiple times, as the semaphore is tied to the given thread. <br>
+	 * Reentrant Lock isn't used since it would allow the thread to lock on the same group. <br>
+	 * the Short.MAX_VALUE is just a very large number that should be larger than the number of
+	 * threads we'll have.
+	 */
+	private final Semaphore pendingTasksSemaphore = new Semaphore(Short.MAX_VALUE, true);
+	
+	private final AtomicInteger finishedRequests = new AtomicInteger();
+	private final AtomicInteger failedRequests = new AtomicInteger();
+	private final ConfigEntry<Boolean> showDebugWireframeConfig;
+	
+	private final SupplierBasedRateLimiter<Void> rateLimiter = new SupplierBasedRateLimiter<>(this::getRequestRateLimit);
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public AbstractFullDataNetworkRequestQueue(
+			ClientNetworkState networkState, IDhClientLevel level, 
+			boolean changedOnly, ConfigEntry<Boolean> showDebugWireframeConfig)
+	{
+		this.networkState = networkState;
+		this.level = level;
+		this.changedOnly = changedOnly;
+		this.showDebugWireframeConfig = showDebugWireframeConfig;
+		DebugRenderer.register(this, this.showDebugWireframeConfig);
+	}
+	
+	
+	
+	//==================//
+	// abstract methods //
+	//==================//
+	
+	protected abstract int getRequestRateLimit();
+	
+	protected abstract String getQueueName();
+	
+	
+	
+	//====================//
+	// request submitting //
+	//====================//
+	
+	public CompletableFuture<Boolean> submitRequest(long sectionPos, Consumer<FullDataSourceV2> dataSourceConsumer)
+	{ return this.submitRequest(sectionPos, null, dataSourceConsumer); }
+	public CompletableFuture<Boolean> submitRequest(long sectionPos, @Nullable Long clientTimestamp, Consumer<FullDataSourceV2> dataSourceConsumer)
+	{
+		LodUtil.assertTrue(DhSectionPos.getDetailLevel(sectionPos) == DhSectionPos.SECTION_MINIMUM_DETAIL_LEVEL, "Only highest-detail sections are allowed.");
+		
+		RequestQueueEntry entry = new RequestQueueEntry(dataSourceConsumer, clientTimestamp);
+		entry.future.whenComplete((success, throwable) ->
+		{
+			this.waitingTasksBySectionPos.remove(sectionPos);
+			
+			this.finishedRequests.incrementAndGet();
+			if (!success || throwable != null)
+			{
+				this.failedRequests.incrementAndGet();
+			}
+		});
+		
+		this.waitingTasksBySectionPos.put(sectionPos, entry);
+		return entry.future;
+	}
+	
+	public synchronized boolean tick(DhBlockPos2D targetPos)
+	{
+		if (this.closingFuture != null || !this.networkState.isReady())
+		{
+			return false;
+		}
+		
+		// queue requests until the queue is full
+		while (this.getInProgressTaskCount() < this.getWaitingTaskCount()
+				&& this.getInProgressTaskCount() < this.getRequestRateLimit()
+				&& this.pendingTasksSemaphore.tryAcquire())
+		{
+			if (!this.rateLimiter.tryAcquire())
+			{
+				this.pendingTasksSemaphore.release();
+				break;
+			}
+			
+			this.sendNextRequest(targetPos);
+		}
+		
+		return true;
+	}
+	private void sendNextRequest(DhBlockPos2D targetPos)
+	{
+		Map.Entry<Long, RequestQueueEntry> mapEntry = this.waitingTasksBySectionPos.entrySet().stream()
+				.filter(task -> task.getValue().networkDataSourceFuture == null)
+				.min((x, y) -> posDistanceSquared(targetPos, x.getKey()) - posDistanceSquared(targetPos, y.getKey()))
+				.orElse(null);
+		
+		if (mapEntry == null)
+		{
+			this.pendingTasksSemaphore.release();
+			return;
+		}
+		
+		long sectionPos = mapEntry.getKey();
+		RequestQueueEntry entry = mapEntry.getValue();
+		
+		CompletableFuture<FullDataSourceResponseMessage> dataSourceFuture = this.networkState.getSession().sendRequest(
+				new FullDataSourceRequestMessage(this.level.getLevelWrapper(), sectionPos, entry.updateTimestamp),
+				FullDataSourceResponseMessage.class
+			);
+		entry.networkDataSourceFuture = dataSourceFuture;
+		dataSourceFuture.handle((response, throwable) ->
+		{
+			this.pendingTasksSemaphore.release();
+			
+			try
+			{
+				if (throwable != null)
+				{
+					throw throwable;
+				}
+				
+				if (response.payload != null)
+				{
+					FullDataSourceV2DTO dataSourceDto = this.networkState.decodeDataSourceAndReleaseBuffer(response.payload);
+					
+					ThreadPoolExecutor executor = ThreadPoolUtil.getNetworkCompressionExecutor();
+					if (executor == null)
+					{
+						LOGGER.warn("Unable to handle FullDataPayload - getNetworkCompressionExecutor() is null");
+						return null;
+					}
+					CompletableFuture.runAsync(() ->
+					{
+						try
+						{
+							FullDataSourceV2 fullDataSource = dataSourceDto.createPooledDataSource(this.level.getLevelWrapper());
+							entry.dataSourceConsumer.accept(fullDataSource);
+							FullDataSourceV2.DATA_SOURCE_POOL.returnPooledDataSource(fullDataSource);
+						}
+						catch (IOException | DataCorruptedException | InterruptedException e)
+						{
+							throw new RuntimeException(e);
+						}
+					}, executor);
+				}
+				else
+				{
+					LodUtil.assertTrue(this.changedOnly, "Received empty data source response for not changes-only request");
+				}
+			}
+			catch (InvalidLevelException | RequestRejectedException ignored)
+			{
+				// We're too late / some cases might trigger a bunch of expected rejections
+				return entry.future.complete(false);
+			}
+			catch (SessionClosedException | CancellationException ignored)
+			{
+				// Triggered when level is unloaded
+				return entry.future.cancel(false);
+			}
+			catch (RateLimitedException e)
+			{
+				LOGGER.warn("Rate limited by server, re-queueing task [" + DhSectionPos.toString(sectionPos) + "]: " + e.getMessage());
+				
+				// Skip all requests for 1 second
+				this.rateLimiter.acquireAll();
+				
+				entry.networkDataSourceFuture = null;
+				return null;
+			}
+			catch (Throwable e)
+			{
+				entry.retryAttempts--;
+				LOGGER.error("Error while fetching full data source, attempts left: {} / {}", entry.retryAttempts, MAX_RETRY_ATTEMPTS, e);
+				
+				// Retry logic
+				if (entry.retryAttempts > 0)
+				{
+					entry.networkDataSourceFuture = null;
+					return null;
+				}
+				else
+				{
+					return entry.future.complete(false);
+				}
+			}
+			
+			// Hack to work around a race condition
+			// If you finish the request too quickly, the section will never render
+			TASK_FINISH_TIMER.schedule(new TimerTask()
+			{
+				@Override
+				public void run()
+				{
+					entry.future.complete(true);
+				}
+			}, 10000);
+			return null;
+		});
+	}
+	
+	
+	
+	
+	//=========================================//
+	// IFullDataSourceRetrievalQueue overrides //
+	//=========================================//
+	
+	public void removeRetrievalRequestIf(DhSectionPos.ICancelablePrimitiveLongConsumer removeIf)
+	{
+		for (Map.Entry<Long, RequestQueueEntry> mapEntry : this.waitingTasksBySectionPos.entrySet())
+		{
+			long pos = mapEntry.getKey();
+			RequestQueueEntry entry = mapEntry.getValue();
+			
+			if (removeIf.accept(pos))
+			{
+				LOGGER.debug("Removing request  " + mapEntry.getKey() + "...");
+				
+				entry.future.cancel(false);
+				if (entry.networkDataSourceFuture != null)
+				{
+					entry.networkDataSourceFuture.cancel(false);
+				}
+			}
+		}
+	}
+	
+	public void addDebugMenuStringsToList(List<String> messageList)
+	{
+		messageList.add(this.getQueueName() + " [" + this.level.getClientLevelWrapper().getDimensionName() + "]");
+		messageList.add("Requests: " + this.finishedRequests + " / " + (this.getWaitingTaskCount() + this.finishedRequests.get()) + " (failed: " + this.failedRequests + ", rate limit: " + this.getRequestRateLimit() + ")");
+	}
+	
+	public int getWaitingTaskCount() { return this.waitingTasksBySectionPos.size(); }
+	public int getInProgressTaskCount() { return Short.MAX_VALUE - this.pendingTasksSemaphore.availablePermits(); }
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	
+	public CompletableFuture<Void> startClosingAsync(boolean alsoInterruptRunning)
+	{
+		return this.closingFuture = CompletableFuture.runAsync(() -> {
+			Stopwatch stopwatch = Stopwatch.createStarted();
+			
+			do
+			{
+				for (RequestQueueEntry entry : this.waitingTasksBySectionPos.values())
+				{
+					entry.future.cancel(alsoInterruptRunning);
+					if (entry.networkDataSourceFuture != null && entry.networkDataSourceFuture.cancel(alsoInterruptRunning))
+					{
+						this.pendingTasksSemaphore.release();
+					}
+				}
+			}
+			while (!this.pendingTasksSemaphore.tryAcquire(Short.MAX_VALUE) && stopwatch.elapsed(TimeUnit.SECONDS) < SHUTDOWN_TIMEOUT_SECONDS);
+			
+			if (stopwatch.elapsed(TimeUnit.SECONDS) >= SHUTDOWN_TIMEOUT_SECONDS)
+			{
+				LOGGER.warn("The request queue [" + this.getQueueName() + "] for level [" + this.level.getLevelWrapper() + "] did not shutdown in [" + SHUTDOWN_TIMEOUT_SECONDS + "] seconds. Some unfinished tasks might be left hanging.");
+			}
+		});
+	}
+	
+	@Override
+	public void close()
+	{
+		DebugRenderer.unregister(this, this.showDebugWireframeConfig);
+	}
+	
+	
+	
+	//===========//
+	// debugging //
+	//===========//
+	
+	@Override
+	public void debugRender(DebugRenderer renderer)
+	{
+		if (MC_CLIENT.getWrappedClientLevel() != this.level.getClientLevelWrapper())
+		{
+			return;
+		}
+		
+		for (Map.Entry<Long, RequestQueueEntry> mapEntry : this.waitingTasksBySectionPos.entrySet())
+		{
+			renderer.renderBox(new DebugRenderer.Box(mapEntry.getKey(), -32f, 64f, 0.05f,
+					mapEntry.getValue().networkDataSourceFuture != null ? Color.red : Color.gray
+			));
+		}
+	}
+	
+	
+	
+	//================//
+	// helper methods //
+	//================//
+	
+	protected static int posDistanceSquared(DhBlockPos2D targetPos, long pos)
+	{ return (int) DhSectionPos.getCenterBlockPos(pos).distSquared(targetPos); }
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	protected static class RequestQueueEntry
+	{
+		/** encapsulates the entire request, including client side queuing and the actual server request */
+		public final CompletableFuture<Boolean> future = new CompletableFuture<>();
+		public final Consumer<FullDataSourceV2> dataSourceConsumer;
+		/** will be null if we want to retrieve the LOD regardless of when it was last updated */
+		@Nullable
+		public final Long updateTimestamp;
+		
+		
+		/** Will be null until the request has been sent to the server */
+		@CheckForNull
+		public CompletableFuture<FullDataSourceResponseMessage> networkDataSourceFuture;
+		
+		/** when this reaches zero then the request will be canceled. */
+		public int retryAttempts = MAX_RETRY_ATTEMPTS;
+		
+		
+		
+		//=============//
+		// constructor //
+		//=============//
+		
+		public RequestQueueEntry(
+				Consumer<FullDataSourceV2> dataSourceConsumer,
+				@Nullable Long updateTimestamp)
+		{
+			this.dataSourceConsumer = dataSourceConsumer;
+			this.updateTimestamp = updateTimestamp;
+		}
+		
+	}
+	
+	
+	
+}
@@ -0,0 +1,210 @@
+package com.seibel.distanthorizons.core.multiplayer.client;
+
+import com.google.common.cache.CacheBuilder;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
+import com.seibel.distanthorizons.core.multiplayer.config.SessionConfig;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import com.seibel.distanthorizons.core.network.event.ScopedNetworkEventSource;
+import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent;
+import com.seibel.distanthorizons.core.network.event.internal.IncompatibleMessageInternalEvent;
+import com.seibel.distanthorizons.core.network.messages.base.CurrentLevelKeyMessage;
+import com.seibel.distanthorizons.core.network.messages.base.SessionConfigMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSplitMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPartialUpdateMessage;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataPayload;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.sql.dto.FullDataSourceV2DTO;
+import com.seibel.distanthorizons.core.util.LodUtil;
+import com.seibel.distanthorizons.coreapi.ModInfo;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.buffer.CompositeByteBuf;
+import org.apache.logging.log4j.LogManager;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.Closeable;
+import java.util.List;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.TimeUnit;
+
+public class ClientNetworkState implements Closeable
+{
+	protected static final ConfigBasedLogger LOGGER = new ConfigBasedLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get());
+	
+	
+	private final ConcurrentMap<Integer, CompositeByteBuf> fullDataBufferById = CacheBuilder.newBuilder()
+			.expireAfterAccess(10, TimeUnit.SECONDS)
+			.<Integer, CompositeByteBuf>build()
+			.asMap();
+	
+	private final SessionConfig.AnyChangeListener configAnyChangeListener = new SessionConfig.AnyChangeListener(this::sendConfigMessage);
+	
+	
+	private final NetworkSession networkSession = new NetworkSession(null);
+	/**
+	 * Returns the client used by this instance. <p>
+	 * If you need to subscribe to any packet events, create an instance of {@link ScopedNetworkEventSource} using the returned instance.
+	 */
+	public NetworkSession getSession() { return this.networkSession; }
+	
+	public SessionConfig sessionConfig = new SessionConfig();
+	
+	private volatile boolean configReceived = false;
+	public boolean isReady() { return this.configReceived; }
+	
+	private EServerSupportStatus serverSupportStatus = EServerSupportStatus.NONE;
+	
+	/** Protocol version closest to supported by this mod version */
+	@Nullable
+	private Integer closestProtocolVersion;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public ClientNetworkState()
+	{
+		this.networkSession.registerHandler(IncompatibleMessageInternalEvent.class, event ->
+		{
+			if (this.closestProtocolVersion == null 
+				|| Math.abs(event.protocolVersion - ModInfo.PROTOCOL_VERSION) < this.closestProtocolVersion)
+			{
+				this.closestProtocolVersion = event.protocolVersion;
+			}
+		});
+		
+		this.networkSession.registerHandler(CurrentLevelKeyMessage.class, message ->
+		{
+			// we will also receive this message when we have full support
+			if (this.serverSupportStatus == EServerSupportStatus.NONE)
+			{
+				this.serverSupportStatus = EServerSupportStatus.LEVELS_ONLY;
+			}
+		});
+		
+		this.networkSession.registerHandler(SessionConfigMessage.class, message ->
+		{
+			this.serverSupportStatus = EServerSupportStatus.FULL;
+			
+			LOGGER.info("Connection config has been changed: ["+message.config+"].");
+			this.sessionConfig = message.config;
+			this.configReceived = true;
+		});
+		
+		this.networkSession.registerHandler(CloseInternalEvent.class, message ->
+		{
+			this.configReceived = false;
+		});
+		
+		this.networkSession.registerHandler(FullDataSplitMessage.class, message ->
+		{
+			if (message.isFirst)
+			{
+				CompositeByteBuf composite = this.fullDataBufferById.remove(message.bufferId);
+				if (composite != null)
+				{
+					composite.release();
+					LOGGER.debug("Released full data buffer ["+message.bufferId+"]: ["+composite+"]");
+				}
+			}
+			
+			CompositeByteBuf byteBuffer = this.fullDataBufferById.computeIfAbsent(message.bufferId, bufferId -> ByteBufAllocator.DEFAULT.compositeBuffer());
+			byteBuffer.addComponent(true, message.buffer);
+			LOGGER.debug("Full data buffer ["+message.bufferId+"]: ["+byteBuffer+"].");
+		});
+
+		this.networkSession.registerHandler(FullDataPartialUpdateMessage.class, msg ->
+		{
+			// Dummy handler to prevent unhandled message warnings
+		});
+	}
+	
+	
+	
+	//==============//
+	// send message //
+	//==============//
+	
+	public FullDataSourceV2DTO decodeDataSourceAndReleaseBuffer(FullDataPayload msg)
+	{
+		CompositeByteBuf compositeByteBuffer = this.fullDataBufferById.remove(msg.dtoBufferId);
+		LodUtil.assertTrue(compositeByteBuffer != null);
+		
+		try
+		{
+			return INetworkObject.decodeToInstance(FullDataSourceV2DTO.CreateEmptyDataSource(), compositeByteBuffer);
+		}
+		finally
+		{
+			compositeByteBuffer.release();
+		}
+	}
+	
+	public void sendConfigMessage()
+	{
+		this.configReceived = false;
+		this.getSession().sendMessage(new SessionConfigMessage(new SessionConfig()));
+	}
+	
+	
+	
+	//===========//
+	// debugging //
+	//===========//
+	
+	public void addDebugMenuStringsToList(List<String> messageList)
+	{
+		if (this.networkSession.isClosed())
+		{
+			messageList.add("NetworkSession closed: " + this.networkSession.getCloseReason().getMessage());
+			return;
+		}
+		
+		if (this.serverSupportStatus == EServerSupportStatus.NONE && this.closestProtocolVersion != null)
+		{
+			messageList.add("Incompatible protocol version: [" + this.closestProtocolVersion + "], required: [" + ModInfo.PROTOCOL_VERSION+ "]");
+			return;
+		}
+		
+		messageList.add(this.serverSupportStatus.message);
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		this.configAnyChangeListener.close();
+		this.networkSession.close();
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	/**
+	 * NONE,        <br>
+	 * LEVELS_ONLY, <br>
+	 * FULL,        <br>
+	 */
+	private enum EServerSupportStatus
+	{
+		NONE("Server does not support DH"),
+		LEVELS_ONLY("Server supports shared level keys"),
+		FULL("Server has full DH support");
+		
+		public final String message;
+		
+		EServerSupportStatus(String message) { this.message = message; }
+		
+	}
+}
@@ -0,0 +1,57 @@
+package com.seibel.distanthorizons.core.multiplayer.client;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.generation.RemoteWorldRetrievalQueue;
+import com.seibel.distanthorizons.core.level.IDhClientLevel;
+import com.seibel.distanthorizons.core.pos.blockPos.DhBlockPos2D;
+
+/** 
+ * This queue only handles LOD updates for
+ * LODs that were changed when the player wasn't online
+ * and the player already loaded the LODs once.
+ * {@link RemoteWorldRetrievalQueue} is used for all other requests.
+ * 
+ * @see Config.Client.Advanced.Multiplayer.ServerNetworking#synchronizeOnLogin
+ * @see RemoteWorldRetrievalQueue
+ */
+public class SyncOnLoginRequestQueue extends AbstractFullDataNetworkRequestQueue
+{
+	//=============//
+	// constructor //
+	//=============//
+	
+	public SyncOnLoginRequestQueue(IDhClientLevel level, ClientNetworkState networkState)
+	{ super(networkState, level, true, Config.Client.Advanced.Debugging.DebugWireframe.showWorldGenQueue); }
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
+	
+	@Override
+	protected int getRequestRateLimit() { return this.networkState.sessionConfig.getSyncOnLoginRateLimit(); }
+	
+	@Override
+	protected String getQueueName() { return "Sync On Login Queue"; }
+	
+	
+	
+	//==================//
+	// request handling //
+	//==================//
+	
+	@Override
+	public boolean tick(DhBlockPos2D targetPos)
+	{
+		if (!this.networkState.sessionConfig.getSynchronizeOnLogin())
+		{
+			return false;
+		}
+		
+		return super.tick(targetPos);
+	}
+	
+	
+	
+}
@@ -0,0 +1,184 @@
+package com.seibel.distanthorizons.core.multiplayer.config;
+
+import com.google.common.base.MoreObjects;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.config.listeners.ConfigChangeListener;
+import com.seibel.distanthorizons.core.config.types.ConfigEntry;
+import com.seibel.distanthorizons.core.network.INetworkObject;
+import io.netty.buffer.ByteBuf;
+
+import java.io.Closeable;
+import java.util.*;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+public class SessionConfig implements INetworkObject
+{
+	private static final LinkedHashMap<String, Entry> CONFIG_ENTRIES = new LinkedHashMap<>();
+	
+	
+	private final LinkedHashMap<String, Object> values = new LinkedHashMap<>();
+	public SessionConfig constrainingConfig;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	static
+	{
+		// Note: config values are ordered by serversideShortName when transmitted
+		
+		registerConfigEntry(Config.Client.Advanced.Graphics.Quality.lodChunkRenderDistanceRadius, Math::min);
+		
+		registerConfigEntry(Config.Client.Advanced.WorldGenerator.enableDistantGeneration, (x, y) -> x && y);
+		registerConfigEntry(Config.Client.Advanced.Multiplayer.ServerNetworking.generationRequestRateLimit, Math::min);
+		
+		registerConfigEntry(Config.Client.Advanced.Multiplayer.ServerNetworking.enableRealTimeUpdates, (x, y) -> x && y);
+		
+		registerConfigEntry(Config.Client.Advanced.Multiplayer.ServerNetworking.synchronizeOnLogin, (x, y) -> x && y);
+		registerConfigEntry(Config.Client.Advanced.Multiplayer.ServerNetworking.syncOnLoginRateLimit, Math::min);
+	}
+	
+	public SessionConfig() {}
+	
+	
+	
+	//===============//
+	// public values //
+	//===============//
+	
+	public int getRenderDistanceRadius() { return this.getValue(Config.Client.Advanced.Graphics.Quality.lodChunkRenderDistanceRadius); }
+	public boolean isDistantGenerationEnabled() { return this.getValue(Config.Client.Advanced.WorldGenerator.enableDistantGeneration); }
+	public int getGenerationRequestRateLimit() { return this.getValue(Config.Client.Advanced.Multiplayer.ServerNetworking.generationRequestRateLimit); }
+	public boolean isRealTimeUpdatesEnabled() { return this.getValue(Config.Client.Advanced.Multiplayer.ServerNetworking.enableRealTimeUpdates); }
+	public boolean getSynchronizeOnLogin() { return this.getValue(Config.Client.Advanced.Multiplayer.ServerNetworking.synchronizeOnLogin); }
+	public int getSyncOnLoginRateLimit() { return this.getValue(Config.Client.Advanced.Multiplayer.ServerNetworking.syncOnLoginRateLimit); }
+	
+	
+	
+	//====================//
+	// entry registration //
+	//====================//
+	
+	private static <T> void registerConfigEntry(ConfigEntry<T> configEntry, BiFunction<T, T, T> valueConstrainer)
+	{
+		CONFIG_ENTRIES.put(Objects.requireNonNull(configEntry.getServersideShortName()), new Entry(configEntry, valueConstrainer));
+	}
+	
+	
+	
+	//==================//
+	// internal getters //
+	//==================//
+	
+	private <T> T getValue(ConfigEntry<T> configEntry) { return this.getValue(configEntry.getServersideShortName()); }
+	@SuppressWarnings("unchecked")
+	private <T> T getValue(String name)
+	{
+		Entry entry = CONFIG_ENTRIES.get(name);
+		
+		T value = (T) this.values.get(name);
+		if (value == null)
+		{
+			value = (T) entry.supplier.get();
+		}
+		
+		return (this.constrainingConfig != null
+				? (T) entry.valueConstrainer.apply(value, this.constrainingConfig.getValue(name))
+				: value);
+	}
+	
+	private Map<String, ?> getValues()
+	{
+		return CONFIG_ENTRIES.keySet().stream().collect(Collectors.toMap(
+				Function.identity(),
+				this::getValue,
+				(x, y) -> x,
+				LinkedHashMap::new
+		));
+	}
+	
+	
+	
+	//===============//
+	// serialization //
+	//===============//
+	
+	@Override
+	public void encode(ByteBuf outBuffer) { this.writeFixedLengthCollection(outBuffer, this.getValues().values()); }
+	
+	@Override
+	public void decode(ByteBuf inBuffer)
+	{
+		for (String key : CONFIG_ENTRIES.keySet())
+		{
+			Object currentValue = this.getValue(key);
+			Object newValue = Codec.getCodec(currentValue.getClass()).decode.apply(currentValue, inBuffer);
+			this.values.put(key, newValue);
+		}
+	}
+	
+	
+	
+	//================//
+	// base overrides //
+	//================//
+	
+	@Override
+	public String toString()
+	{
+		return MoreObjects.toStringHelper(this)
+				.add("values", this.getValues())
+				.toString();
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	private static class Entry
+	{
+		public final ConfigEntry<Object> supplier;
+		public final BiFunction<Object, Object, Object> valueConstrainer;
+		
+		@SuppressWarnings("unchecked")
+		private <T> Entry(ConfigEntry<T> supplier, BiFunction<T, T, T> valueConstrainer)
+		{
+			this.supplier = (ConfigEntry<Object>) supplier;
+			this.valueConstrainer = (BiFunction<Object, Object, Object>) valueConstrainer;
+		}
+		
+	}
+	
+	/** fires if any config value was changed */
+	public static class AnyChangeListener implements Closeable
+	{
+		private final ArrayList<ConfigChangeListener<?>> changeListeners;
+		
+		public AnyChangeListener(Runnable runnable)
+		{
+			this.changeListeners = new ArrayList<>(CONFIG_ENTRIES.size());
+			for (Entry entry : CONFIG_ENTRIES.values())
+			{
+				this.changeListeners.add(new ConfigChangeListener<>(entry.supplier, ignored -> runnable.run()));
+			}
+		}
+		
+		@Override
+		public void close()
+		{
+			for (ConfigChangeListener<?> changeListener : this.changeListeners)
+			{
+				changeListener.close();
+			}
+			this.changeListeners.clear();
+		}
+		
+	}
+	
+}
@@ -0,0 +1,123 @@
+package com.seibel.distanthorizons.core.multiplayer.server;
+
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.config.listeners.ConfigChangeListener;
+import com.seibel.distanthorizons.core.level.AbstractDhServerLevel;
+import com.seibel.distanthorizons.core.multiplayer.config.SessionConfig;
+import com.seibel.distanthorizons.core.network.messages.base.CurrentLevelKeyMessage;
+import com.seibel.distanthorizons.core.network.messages.base.SessionConfigMessage;
+import com.seibel.distanthorizons.core.network.event.internal.CloseInternalEvent;
+import com.seibel.distanthorizons.core.network.exceptions.RateLimitedException;
+import com.seibel.distanthorizons.core.network.messages.fullData.FullDataSourceRequestMessage;
+import com.seibel.distanthorizons.core.network.session.NetworkSession;
+import com.seibel.distanthorizons.core.util.ratelimiting.SupplierBasedRateAndConcurrencyLimiter;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
+import org.jetbrains.annotations.NotNull;
+
+import java.io.Closeable;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class ServerPlayerState implements Closeable
+{
+	private final ConfigChangeListener<String> levelKeyPrefixChangeListener
+			= new ConfigChangeListener<>(Config.Client.Advanced.Multiplayer.ServerNetworking.levelKeyPrefix, this::onLevelKeyPrefixConfigChanged);
+	private final SessionConfig.AnyChangeListener configAnyChangeListener = new SessionConfig.AnyChangeListener(this::onSessionConfigChanged);
+	
+	
+	private String lastLevelKey = "";
+	
+	
+	public final NetworkSession networkSession;
+	public IServerPlayerWrapper getServerPlayer() { return this.networkSession.serverPlayer; }
+	
+	@NotNull
+	public final SessionConfig sessionConfig = new SessionConfig();
+	
+	private final ConcurrentHashMap<AbstractDhServerLevel, RateLimiterSet> rateLimiterSets = new ConcurrentHashMap<>();
+	public RateLimiterSet getRateLimiterSet(AbstractDhServerLevel level) { return this.rateLimiterSets.computeIfAbsent(level, ignored -> new RateLimiterSet()); }
+	public void clearRateLimiterSets() { this.rateLimiterSets.clear(); }
+	
+	
+	
+	//==============//
+	// constructors //
+	//==============//
+	
+	public ServerPlayerState(IServerPlayerWrapper serverPlayer)
+	{
+		this.networkSession = new NetworkSession(serverPlayer);
+		
+		this.networkSession.registerHandler(SessionConfigMessage.class, (sessionConfigMessage) ->
+		{
+			this.sessionConfig.constrainingConfig = sessionConfigMessage.config;
+			this.sendLevelKey();
+			this.networkSession.sendMessage(new SessionConfigMessage(this.sessionConfig));
+		});
+		
+		this.networkSession.registerHandler(CloseInternalEvent.class, event -> {
+			// No-op. prevents "Unhandled message" log entries
+		});
+	}
+	
+	
+	
+	//=================//
+	// client updating //
+	//=================//
+	
+	private void onLevelKeyPrefixConfigChanged(String newLevelKey) { this.sendLevelKey(); }
+	private void sendLevelKey()
+	{
+		if (Config.Client.Advanced.Multiplayer.ServerNetworking.sendLevelKeys.get())
+		{
+			// let the client's know about the change
+			String levelKey = this.getServerPlayer().getLevel().getKeyedLevelDimensionName();
+			if (!levelKey.equals(this.lastLevelKey))
+			{
+				this.lastLevelKey = levelKey;
+				this.networkSession.sendMessage(new CurrentLevelKeyMessage(levelKey));
+			}
+		}
+	}
+	
+	private void onSessionConfigChanged() { this.networkSession.sendMessage(new SessionConfigMessage(this.sessionConfig)); }
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		this.levelKeyPrefixChangeListener.close();
+		this.configAnyChangeListener.close();
+		this.networkSession.close();
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	public class RateLimiterSet
+	{
+		public final SupplierBasedRateAndConcurrencyLimiter<FullDataSourceRequestMessage> generationRequestRateLimiter = new SupplierBasedRateAndConcurrencyLimiter<>(
+				() -> Config.Client.Advanced.Multiplayer.ServerNetworking.generationRequestRateLimit.get(),
+				msg -> {
+					msg.sendResponse(new RateLimitedException("Full data request rate limit: " + ServerPlayerState.this.sessionConfig.getGenerationRequestRateLimit()));
+				}
+		);
+		
+		public final SupplierBasedRateAndConcurrencyLimiter<FullDataSourceRequestMessage> syncOnLoginRateLimiter = new SupplierBasedRateAndConcurrencyLimiter<>(
+				() -> Config.Client.Advanced.Multiplayer.ServerNetworking.syncOnLoginRateLimit.get(),
+				msg -> {
+					msg.sendResponse(new RateLimitedException("Sync on login rate limit: " + ServerPlayerState.this.sessionConfig.getSyncOnLoginRateLimit()));
+				}
+		);
+		
+	}
+	
+}
@@ -0,0 +1,94 @@
+package com.seibel.distanthorizons.core.multiplayer.server;
+
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.wrapperInterfaces.misc.IServerPlayerWrapper;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Queue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+public class ServerPlayerStateManager
+{
+	private final ConcurrentMap<IServerPlayerWrapper, ServerPlayerState> connectedPlayerStateByPlayerWrapper = new ConcurrentHashMap<>();
+	private final ConcurrentMap<IServerPlayerWrapper, MessageQueueState> messageQueueByPlayerWrapper = new ConcurrentHashMap<>();
+	
+	
+	
+	//========================//
+	// player joining/leaving //
+	//========================//
+	
+	public ServerPlayerState registerJoinedPlayer(IServerPlayerWrapper serverPlayer)
+	{
+		ServerPlayerState playerState = new ServerPlayerState(serverPlayer);
+		this.connectedPlayerStateByPlayerWrapper.put(serverPlayer, playerState);
+		return playerState;
+	}
+	
+	public void unregisterLeftPlayer(IServerPlayerWrapper serverPlayer)
+	{
+		ServerPlayerState playerState = this.connectedPlayerStateByPlayerWrapper.remove(serverPlayer);
+		if (playerState != null)
+		{
+			playerState.close();
+		}
+	}
+	
+	
+	
+	//==========//
+	// messages //
+	//==========//
+	
+	public void handlePluginMessage(IServerPlayerWrapper player, AbstractNetworkMessage message)
+	{
+		MessageQueueState messageQueue = this.messageQueueByPlayerWrapper.computeIfAbsent(player, k -> new MessageQueueState());
+		messageQueue.messageQueue.add(message);
+		
+		ServerPlayerState playerState = this.connectedPlayerStateByPlayerWrapper.get(player);
+		if (playerState != null)
+		{
+			this.handlePluginMessagesFromQueue(playerState, messageQueue);
+		}
+	}
+	
+	public void handlePluginMessagesFromQueue(ServerPlayerState playerState)
+	{
+		MessageQueueState messageQueue = this.messageQueueByPlayerWrapper.computeIfAbsent(playerState.getServerPlayer(), k -> new MessageQueueState());
+		this.handlePluginMessagesFromQueue(playerState, messageQueue);
+	}
+	
+	private void handlePluginMessagesFromQueue(ServerPlayerState playerState, MessageQueueState messageQueueState)
+	{
+		while (!messageQueueState.messageQueue.isEmpty() && messageQueueState.isBeingDrained.compareAndSet(false, true))
+		{
+			AbstractNetworkMessage message = messageQueueState.messageQueue.poll();
+			playerState.networkSession.tryHandleMessage(message);
+			
+			messageQueueState.isBeingDrained.set(false);
+		}
+	}
+	
+	
+	
+	//=========//
+	// getters //
+	//=========//
+	
+	@Nullable
+	public ServerPlayerState getConnectedPlayer(IServerPlayerWrapper player) { return this.connectedPlayerStateByPlayerWrapper.get(player); }
+	public Iterable<ServerPlayerState> getConnectedPlayers() { return this.connectedPlayerStateByPlayerWrapper.values(); }
+	
+	
+	private static class MessageQueueState
+	{
+		public final Queue<AbstractNetworkMessage> messageQueue = new ConcurrentLinkedQueue<>();
+		public final AtomicBoolean isBeingDrained = new AtomicBoolean();
+		
+	}
+	
+	
+}
@@ -0,0 +1,228 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network;
+
+import io.netty.buffer.ByteBuf;
+import org.jetbrains.annotations.Contract;
+
+import javax.annotation.Nullable;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.function.*;
+
+/** The base for any object that can be sent over the network. */
+public interface INetworkObject
+{
+	/** Serializes this object into the given {@link ByteBuf} */
+	void encode(ByteBuf out);
+	/** Populates this object's from the given {@link ByteBuf} */
+	void decode(ByteBuf in);
+	
+	
+	
+	//========================//
+	// default/static methods //
+	//========================//
+	
+	/** 
+	 * @param obj the empty object that will be populated by the incoming {@link ByteBuf}
+	 */
+	static <T extends INetworkObject> T decodeToInstance(T obj, ByteBuf inputByteBuf)
+	{
+		obj.decode(inputByteBuf);
+		return obj;
+	}
+	
+	
+	
+	@Contract("_, null -> false; _, !null -> true")
+	default boolean writeOptional(ByteBuf outputByteBuf, Object value)
+	{
+		boolean isNull = value != null;
+		outputByteBuf.writeBoolean(isNull);
+		return isNull;
+	}
+	
+	@Nullable
+	default <T> T readOptional(ByteBuf inputByteBuf, Supplier<T> decoder)
+	{
+		return inputByteBuf.readBoolean()
+				? decoder.get() 
+				: null;
+	}
+	default void readOptional(ByteBuf inputByteBuf, Runnable decoder)
+	{
+		if (inputByteBuf.readBoolean())
+		{
+			decoder.run();
+		}
+	}
+	
+	
+	// strings //
+	
+	default void writeString(String inputString, ByteBuf outputByteBuf) { INetworkObject.writeStringStatic(inputString, outputByteBuf); }
+	static void writeStringStatic(String inputString, ByteBuf outputByteBuf)
+	{
+		byte[] bytes = inputString.getBytes(StandardCharsets.UTF_8);
+		outputByteBuf.writeShort(bytes.length);
+		outputByteBuf.writeBytes(bytes);
+	}
+	
+	default String readString(ByteBuf inputByteBuf) { return INetworkObject.readStringStatic(inputByteBuf); }
+	static String readStringStatic(ByteBuf inputByteBuf)
+	{
+		int length = inputByteBuf.readUnsignedShort();
+		return inputByteBuf.readSlice(length).toString(StandardCharsets.UTF_8);
+	}
+	
+	
+	// collections //
+	
+	default <T> void writeCollection(ByteBuf outputByteBuf, Collection<T> collection)
+	{
+		outputByteBuf.writeInt(collection.size());
+		this.writeFixedLengthCollection(outputByteBuf, collection);
+	}
+	default <T> void writeFixedLengthCollection(ByteBuf outputByteBuf, Collection<T> collection)
+	{
+		for (T item : collection)
+		{
+			Codec codec = Codec.getCodec(item.getClass());
+			codec.encode.accept(item, outputByteBuf);
+		}
+	}
+	
+	default <T> void readCollection(ByteBuf inputByteBuf, Collection<T> collection, Supplier<T> innerValueConstructor)
+	{
+		int size = inputByteBuf.readInt();
+		
+		Codec codec = null;
+		for (int i = 0; i < size; i++)
+		{
+			T item = innerValueConstructor.get();
+			
+			if (codec == null)
+			{
+				codec = Codec.getCodec(item.getClass());
+			}
+			//noinspection unchecked
+			item = (T) codec.decode.apply(item, inputByteBuf);
+			
+			collection.add(item);
+		}
+	}
+	
+	default <K, V> void readMap(ByteBuf inputByteBuf, Map<K, V> map, Supplier<K> keySupplier, Supplier<V> valueSupplier)
+	{
+		ArrayList<Map.Entry<K, V>> entryList = new ArrayList<>();
+		
+		this.readCollection(inputByteBuf, entryList, () -> new AbstractMap.SimpleEntry<>(keySupplier.get(), valueSupplier.get()));
+		for (Map.Entry<K, V> entry : entryList)
+		{
+			map.put(entry.getKey(), entry.getValue());
+		}
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	/**
+	 * Defines (de)serialization for different classes,
+	 * specifically for base classes like {@link Integer}, {@link Boolean}, and {@link String}. <br><br>
+	 * 
+	 * Should only be used for non-editable classes;
+	 * otherwise, you may want to implement {@link INetworkObject} and use its methods where applicable.
+	 */
+	class Codec
+	{
+		private static final ConcurrentMap<Class<?>, Codec> CODEC_MAP = new ConcurrentHashMap<Class<?>, Codec>()
+		{{
+			// Primitives must be added manually here
+			this.put(Integer.class, new Codec((obj, outByteBuff) -> outByteBuff.writeInt((int)obj), (obj, inByteBuff) -> inByteBuff.readInt()));
+			this.put(Boolean.class, new Codec((obj, outByteBuff) -> outByteBuff.writeBoolean((boolean) obj), (obj, inByteBuff) -> inByteBuff.readBoolean()));
+			this.put(String.class, new Codec((obj, outByteBuff) -> INetworkObject.writeStringStatic((String) obj, outByteBuff), (obj, inByteBuff) -> INetworkObject.readStringStatic(inByteBuff)));
+			
+			this.put(INetworkObject.class, new Codec(INetworkObject::encode, INetworkObject::decodeToInstance));
+			this.put(Map.Entry.class, new Codec(
+					(obj, outByteBuff) -> 
+					{
+						Map.Entry<?, ?> entry = (Entry<?, ?>) obj;
+						getCodec(entry.getKey().getClass()).encode.accept(entry.getKey(), outByteBuff);
+						getCodec(entry.getValue().getClass()).encode.accept(entry.getValue(), outByteBuff);
+					},
+					(obj, inByteBuff) -> 
+					{
+						Map.Entry<?, ?> entry = (Entry<?, ?>) obj;
+						return new SimpleEntry<>(
+							getCodec(entry.getKey().getClass()).decode.apply(entry.getKey(), inByteBuff),
+							getCodec(entry.getValue().getClass()).decode.apply(entry.getValue(), inByteBuff)
+						);
+					}
+			));
+		}};
+		
+		
+		public final BiConsumer<Object, ByteBuf> encode;
+		public final BiFunction<Object, ByteBuf, Object> decode;
+		
+		
+		
+		//=============//
+		// constructor //
+		//=============//
+		
+		@SuppressWarnings("unchecked")
+		public <T> Codec(BiConsumer<T, ByteBuf> encode, BiFunction<T, ByteBuf, T> decode)
+		{
+			this.encode = (BiConsumer<Object, ByteBuf>) encode;
+			this.decode = (BiFunction<Object, ByteBuf, Object>) decode;
+		}
+		
+		
+		
+		//================//
+		// static methods //
+		//================//
+		
+		public static <T> Codec getCodec(Class<T> clazz)
+		{
+			return CODEC_MAP.computeIfAbsent(clazz, ignored -> 
+			{
+				// TODO when would this ever return true?
+				for (Map.Entry<Class<?>, Codec> entry : CODEC_MAP.entrySet())
+				{
+					if (entry.getKey().isAssignableFrom(clazz))
+					{
+						return entry.getValue();
+					}
+				}
+				
+				throw new AssertionError("Class has no compatible codec: " + clazz.getSimpleName());
+			});
+		}
+		
+	}
+}
@@ -1,175 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network;
-
-import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.network.messages.CloseMessage;
-import com.seibel.distanthorizons.core.network.messages.CloseReasonMessage;
-import com.seibel.distanthorizons.core.network.messages.HelloMessage;
-import com.seibel.distanthorizons.core.network.protocol.NetworkChannelInitializer;
-//import io.netty.bootstrap.Bootstrap;
-//import io.netty.channel.Channel;
-//import io.netty.channel.ChannelFuture;
-//import io.netty.channel.ChannelOption;
-//import io.netty.channel.EventLoopGroup;
-//import io.netty.channel.nio.NioEventLoopGroup;
-//import io.netty.channel.socket.nio.NioSocketChannel;
-import org.apache.logging.log4j.Logger;
-
-import java.net.InetSocketAddress;
-import java.util.concurrent.TimeUnit;
-
-public class NetworkClient //extends NetworkEventSource implements AutoCloseable 
-{
-//    private static final Logger LOGGER = DhLoggerBuilder.getLogger();
-//	
-//    private enum EConnectionState
-//	{
-//        OPEN,
-//        RECONNECT,
-//        RECONNECT_FORCE,
-//        CLOSE_WAIT,
-//        CLOSED
-//    }
-//	
-//    private static final int FAILURE_RECONNECT_DELAY_SEC = 5;
-//    private static final int FAILURE_RECONNECT_ATTEMPTS = 3;
-//	
-//    // TODO move to payload of some sort
-//    private final InetSocketAddress address;
-//	
-//    private final EventLoopGroup workerGroup = new NioEventLoopGroup();
-//    private final Bootstrap clientBootstrap = new Bootstrap()
-//            .group(this.workerGroup)
-//            .channel(NioSocketChannel.class)
-//            .option(ChannelOption.SO_KEEPALIVE, true)
-//            .handler(new NetworkChannelInitializer(this.messageHandler));
-//	
-//    private EConnectionState connectionState;
-//    private Channel channel;
-//    private int reconnectAttempts = FAILURE_RECONNECT_ATTEMPTS;
-//	
-//	
-//	
-//    public NetworkClient(String host, int port)
-//	{
-//        this.address = new InetSocketAddress(host, port);
-//		
-//		this.registerHandlers();
-//		this.connect();
-//    }
-//	
-//    private void registerHandlers() 
-//	{
-//		this.registerHandler(HelloMessage.class, (helloMessage, channelContext) -> 
-//		{
-//            LOGGER.info("Connected to server: "+channelContext.channel().remoteAddress());
-//        });
-//		
-//		this.registerHandler(CloseReasonMessage.class, (closeReasonMessage, channelContext) -> 
-//		{
-//            LOGGER.info(closeReasonMessage.reason);
-//			this.connectionState = EConnectionState.CLOSE_WAIT;
-//        });
-//		
-//		this.registerHandler(CloseMessage.class, (closeMessage, channelContext) ->
-//		{
-//            LOGGER.info("Disconnected from server: "+channelContext.channel().remoteAddress());
-//            if (this.connectionState == EConnectionState.CLOSE_WAIT)
-//			{
-//				this.close();
-//			}
-//        });
-//    }
-//
-//    private void connect() 
-//	{
-//        LOGGER.info("Connecting to server: "+this.address);
-//		this.connectionState = EConnectionState.OPEN;
-//
-//		// FIXME sometimes this causes the MC connection to crash 
-//		//  this might happen if the URL can't be converted to a IP (IE UnknownHostException)
-//        ChannelFuture connectFuture = this.clientBootstrap.connect(this.address);
-//        connectFuture.addListener((ChannelFuture channelFuture) -> 
-//		{
-//            if (!channelFuture.isSuccess()) 
-//			{
-//                LOGGER.warn("Connection failed: "+channelFuture.cause());
-//                return;
-//            }
-//			
-//			this.channel.writeAndFlush(new HelloMessage());
-//        });
-//		
-//		this.channel = connectFuture.channel();
-//		this. channel.closeFuture().addListener((ChannelFuture channelFuture) -> 
-//		{
-//			switch (this.connectionState)
-//			{
-//				case OPEN:
-//					this.reconnectAttempts--;
-//					LOGGER.info("Reconnection attempts left: ["+this.reconnectAttempts+"] of ["+FAILURE_RECONNECT_ATTEMPTS+"].");
-//					if (this.reconnectAttempts == 0)
-//					{
-//						this.connectionState = EConnectionState.CLOSE_WAIT;
-//						return;
-//					}
-//					
-//					this.connectionState = EConnectionState.RECONNECT;
-//					this.workerGroup.schedule(this::connect, FAILURE_RECONNECT_DELAY_SEC, TimeUnit.SECONDS);
-//					break;
-//					
-//				case RECONNECT_FORCE:
-//					LOGGER.info("Reconnecting forcefully.");
-//					this.reconnectAttempts = FAILURE_RECONNECT_ATTEMPTS;
-//					
-//					this.connectionState = EConnectionState.RECONNECT;
-//					this.workerGroup.schedule(this::connect, 0, TimeUnit.SECONDS);
-//					break;
-//			}
-//        });
-//    }
-//
-//    /** Kills the current connection, triggering auto-reconnection immediately. */
-//    public void reconnect() 
-//	{
-//		this.connectionState = EConnectionState.RECONNECT_FORCE;
-//		this.channel.disconnect();
-//    }
-//
-//    @Override
-//    public void close() 
-//	{
-//        if (this.closeReason != null)
-//		{
-//			LOGGER.error(this.closeReason);
-//		}
-//
-//        if (this.connectionState == EConnectionState.CLOSED)
-//		{
-//			return;
-//		}
-//		
-//		this.connectionState = EConnectionState.CLOSED;
-//		this.workerGroup.shutdownGracefully().syncUninterruptibly();
-//		this.channel.close().syncUninterruptibly();
-//    }
-	
-}
@@ -1,82 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network;
-
-import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.network.messages.AckMessage;
-import com.seibel.distanthorizons.core.network.messages.HelloMessage;
-import com.seibel.distanthorizons.core.network.protocol.INetworkMessage;
-import com.seibel.distanthorizons.core.network.protocol.MessageHandler;
-import com.seibel.distanthorizons.coreapi.ModInfo;
-//import io.netty.channel.ChannelHandlerContext;
-import org.apache.logging.log4j.Logger;
-
-import java.util.function.BiConsumer;
-import java.util.function.Consumer;
-
-public abstract class NetworkEventSource implements AutoCloseable
-{
-	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
-	
-	protected final MessageHandler messageHandler = new MessageHandler();
-	protected String closeReason = null;
-
-
-
-//	public NetworkEventSource()
-//	{
-//		this.registerHandler(HelloMessage.class, (helloMessage, channelContext) -> 
-//		{
-//			if (helloMessage.version != ModInfo.PROTOCOL_VERSION)
-//			{
-//				try
-//				{
-//					String closeReason = "Ignoring message from channel ["+channelContext.name()+"], due to version mismatch. Expected version: ["+ModInfo.PROTOCOL_VERSION+"], received version: ["+helloMessage.version+"].";
-//					LOGGER.info(closeReason);
-//					this.close(closeReason);
-//				}
-//				catch (Exception e)
-//				{
-//					throw new RuntimeException(e);
-//				}
-//			}
-//		});
-//	}
-//	
-//	public <T extends INetworkMessage> void registerHandler(Class<T> clazz, BiConsumer<T, ChannelHandlerContext> handler) { this.messageHandler.registerHandler(clazz, handler); }
-//	
-//	public <T extends INetworkMessage> void registerAckHandler(Class<T> clazz, Consumer<ChannelHandlerContext> handler)
-//	{
-//		this.messageHandler.registerHandler(AckMessage.class, (ackMessage, channelContext) -> 
-//		{
-//			if (ackMessage.messageType == clazz)
-//			{
-//				handler.accept(channelContext);
-//			}
-//		});
-//	}
-//	
-//	public void close(String reason) throws Exception
-//	{
-//		this.closeReason = reason;
-//		this.close();
-//	}
-	
-}
@@ -1,122 +0,0 @@
-/*
- *    This file is part of the Distant Horizons mod
- *    licensed under the GNU LGPL v3 License.
- *
- *    Copyright (C) 2020-2023 James Seibel
- *
- *    This program is free software: you can redistribute it and/or modify
- *    it under the terms of the GNU Lesser General Public License as published by
- *    the Free Software Foundation, version 3.
- *
- *    This program is distributed in the hope that it will be useful,
- *    but WITHOUT ANY WARRANTY; without even the implied warranty of
- *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *    GNU Lesser General Public License for more details.
- *
- *    You should have received a copy of the GNU Lesser General Public License
- *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package com.seibel.distanthorizons.core.network;
-
-import com.seibel.distanthorizons.core.logging.DhLoggerBuilder;
-import com.seibel.distanthorizons.core.network.messages.CloseReasonMessage;
-import com.seibel.distanthorizons.core.network.messages.CloseMessage;
-import com.seibel.distanthorizons.core.network.messages.HelloMessage;
-import com.seibel.distanthorizons.core.network.protocol.NetworkChannelInitializer;
-//import io.netty.bootstrap.ServerBootstrap;
-//import io.netty.channel.*;
-//import io.netty.channel.nio.NioEventLoopGroup;
-//import io.netty.channel.socket.nio.NioServerSocketChannel;
-//import io.netty.handler.logging.LogLevel;
-//import io.netty.handler.logging.LoggingHandler;
-import org.apache.logging.log4j.Logger;
-
-public class NetworkServer //extends NetworkEventSource implements AutoCloseable
-{
-//	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
-//	
-//	// TODO move to the config
-//	private final int port;
-//	
-//	private final EventLoopGroup bossGroup = new NioEventLoopGroup(1);
-//	private final EventLoopGroup workerGroup = new NioEventLoopGroup();
-//	private Channel channel;
-//	private boolean isClosed = false;
-//	
-//	
-//	
-//	public NetworkServer(int port)
-//	{
-//		this.port = port;
-//		
-//		LOGGER.info("Starting server on port "+port);
-//		this.registerHandlers();
-//		this.bind();
-//	}
-//	
-//	private void registerHandlers()
-//	{
-//		this.registerHandler(HelloMessage.class, (helloMessage, channelContext) -> 
-//		{
-//			LOGGER.info("Client connected: "+channelContext.channel().remoteAddress());
-//			channelContext.channel().writeAndFlush(new HelloMessage());
-//		});
-//		
-//		this.registerHandler(CloseMessage.class, (closeMessage, channelContext) -> 
-//		{
-//			LOGGER.info("Client disconnected: "+channelContext.channel().remoteAddress());
-//		});
-//	}
-//	
-//	private void bind()
-//	{
-//		ServerBootstrap bootstrap = new ServerBootstrap()
-//				.group(this.bossGroup, this.workerGroup)
-//				.channel(NioServerSocketChannel.class)
-//				.handler(new LoggingHandler(LogLevel.DEBUG))
-//				.childHandler(new NetworkChannelInitializer(this.messageHandler));
-//		
-//		ChannelFuture bindFuture = bootstrap.bind(this.port);
-//		bindFuture.addListener((ChannelFuture channelFuture) -> 
-//		{
-//			if (!channelFuture.isSuccess())
-//			{
-//				throw new RuntimeException("Failed to bind: " + channelFuture.cause());
-//			}
-//			
-//			LOGGER.info("Server is started on port "+this.port);
-//		});
-//		
-//		this.channel = bindFuture.channel();
-//		this.channel.closeFuture().addListener(future -> this.close());
-//	}
-//	
-//	public void disconnectClient(ChannelHandlerContext ctx, String reason)
-//	{
-//		ctx.channel().config().setAutoRead(false);
-//		ctx.writeAndFlush(new CloseReasonMessage(reason))
-//				.addListener(ChannelFutureListener.CLOSE);
-//	}
-//	
-//	@Override
-//	public void close()
-//	{
-//		if (this.closeReason != null)
-//		{
-//			LOGGER.error(this.closeReason);
-//		}
-//		
-//		if (this.isClosed)
-//		{
-//			return;
-//		}
-//		this.isClosed = true;
-//		
-//		LOGGER.info("Shutting down the network server.");
-//		this.workerGroup.shutdownGracefully().syncUninterruptibly();
-//		this.bossGroup.shutdownGracefully().syncUninterruptibly();
-//		LOGGER.info("Network server has been closed.");
-//	}
-	
-}
@@ -0,0 +1,235 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.event;
+
+import com.google.common.cache.CacheBuilder;
+import com.seibel.distanthorizons.core.config.Config;
+import com.seibel.distanthorizons.core.logging.ConfigBasedLogger;
+import com.seibel.distanthorizons.core.network.event.internal.AbstractInternalEvent;
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import com.seibel.distanthorizons.core.network.messages.AbstractTrackableMessage;
+import com.seibel.distanthorizons.core.network.messages.MessageRegistry;
+import com.seibel.distanthorizons.core.network.session.SessionClosedException;
+import com.seibel.distanthorizons.core.network.messages.requests.CancelMessage;
+import com.seibel.distanthorizons.core.network.messages.requests.ExceptionMessage;
+import com.seibel.distanthorizons.coreapi.ModInfo;
+import org.apache.logging.log4j.LogManager;
+
+import java.io.InvalidClassException;
+import java.util.Collections;
+import java.util.Set;
+import java.util.concurrent.*;
+import java.util.function.Consumer;
+
+public abstract class AbstractNetworkEventSource
+{
+	private static final ConfigBasedLogger LOGGER = new ConfigBasedLogger(LogManager.getLogger(),
+			() -> Config.Client.Advanced.Logging.logNetworkEvent.get());
+	
+	
+	/**
+	 * Contains all message handlers. <br>
+	 * Grouped by: <br>
+	 * - {@link AbstractNetworkMessage} type <br>
+	 * - {@link AbstractNetworkEventSource} <br>
+	 */
+	private final ConcurrentHashMap<
+			Class<? extends AbstractNetworkMessage>,
+			ConcurrentMap<AbstractNetworkEventSource, Set<INetworkMessageConsumer>>
+			> networkHandlerSetByMessageClass = new ConcurrentHashMap<>();
+	
+	
+	private final ConcurrentHashMap<Long, FutureResponseData> pendingFutureById = new ConcurrentHashMap<>();
+	/** automatically forgets about ID's after a set time span. */
+	private final Set<Long> cancelledFutureIdSet = Collections.newSetFromMap(
+			CacheBuilder.newBuilder()
+			.expireAfterWrite(10, TimeUnit.SECONDS)
+			.<Long, Boolean>build()
+			.asMap());
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	protected void handleMessage(AbstractNetworkMessage message)
+	{
+		boolean handled = false;
+		
+		ConcurrentMap<AbstractNetworkEventSource, Set<INetworkMessageConsumer>> handlersByEventSource = this.networkHandlerSetByMessageClass.get(message.getClass());
+		if (handlersByEventSource != null)
+		{
+			for (Set<INetworkMessageConsumer> handlerSet : handlersByEventSource.values())
+			{
+				for (INetworkMessageConsumer handler : handlerSet)
+				{
+					handled = true;
+					handler.accept(message);
+				}
+			}
+		}
+		
+		if (message instanceof AbstractTrackableMessage)
+		{
+			AbstractTrackableMessage trackableMessage = (AbstractTrackableMessage) message;
+			
+			FutureResponseData responseData = this.pendingFutureById.get(trackableMessage.futureId);
+			if (responseData != null)
+			{
+				handled = true;
+				
+				if (message instanceof ExceptionMessage)
+				{
+					responseData.future.completeExceptionally(((ExceptionMessage) message).exception);
+				}
+				else if (message.getClass() != responseData.responseClass)
+				{
+					responseData.future.completeExceptionally(new InvalidClassException("Response with invalid type: expected " + responseData.responseClass.getSimpleName() + ", got:" + message));
+				}
+				else
+				{
+					responseData.future.complete(trackableMessage);
+				}
+			}
+			else if (this.cancelledFutureIdSet.remove(trackableMessage.futureId))
+			{
+				handled = true;
+			}
+		}
+		
+		if (!handled && ModInfo.IS_DEV_BUILD)
+		{
+			LOGGER.warn("Unhandled message: [{}].", message);
+		}
+	}
+	
+	
+	
+	//==================//
+	// abstract methods //
+	//==================//
+	
+	public abstract <T extends AbstractNetworkMessage> void registerHandler(Class<T> handlerClass, Consumer<T> handlerImplementation);
+	
+	
+	
+	//==================//
+	// message handlers //
+	//==================//
+	
+	protected final <T extends AbstractNetworkMessage> void registerHandler(AbstractNetworkEventSource eventSource, Class<T> handlerClass, Consumer<T> handlerImplementation)
+	{
+		if (!AbstractInternalEvent.class.isAssignableFrom(handlerClass))
+		{
+			MessageRegistry.INSTANCE.getMessageId(handlerClass);
+		}
+		
+		//noinspection unchecked
+		this.networkHandlerSetByMessageClass
+				.computeIfAbsent(handlerClass, missingHandlerClass -> new ConcurrentHashMap<>())
+				.computeIfAbsent(eventSource, missingEventSource -> ConcurrentHashMap.newKeySet())
+				.add((m) -> handlerImplementation.accept((T) m));
+	}
+	
+	protected void removeAllHandlers(AbstractNetworkEventSource eventSource)
+	{
+		for (ConcurrentMap<AbstractNetworkEventSource, Set<INetworkMessageConsumer>> handlerMap : this.networkHandlerSetByMessageClass.values())
+		{
+			handlerMap.remove(eventSource);
+		}
+	}
+	
+	
+	
+	//================//
+	// create message //
+	//================//
+	
+	protected <TResponse extends AbstractTrackableMessage> CompletableFuture<TResponse> createRequest(AbstractTrackableMessage msg, Class<TResponse> responseClass)
+	{
+		CompletableFuture<TResponse> responseFuture = new CompletableFuture<>();
+		responseFuture.whenComplete((response, throwable) ->
+		{
+			if (throwable instanceof CancellationException)
+			{
+				this.cancelledFutureIdSet.add(msg.futureId);
+				msg.sendResponse(new CancelMessage());
+			}
+			
+			if (!(throwable instanceof SessionClosedException))
+			{
+				this.pendingFutureById.remove(msg.futureId);
+			}
+		});
+		
+		this.pendingFutureById.put(msg.futureId, new FutureResponseData(responseClass, responseFuture));
+		
+		return responseFuture;
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	public void close()
+	{
+		this.networkHandlerSetByMessageClass.clear();
+		this.completeAllFuturesExceptionally(new SessionClosedException(this.getClass().getSimpleName() + " is closed."));
+	}
+	private void completeAllFuturesExceptionally(Throwable cause)
+	{
+		for (FutureResponseData responseData : this.pendingFutureById.values())
+		{
+			responseData.future.completeExceptionally(cause);
+		}
+	}
+	
+	
+	
+	//================//
+	// helper classes //
+	//================//
+	
+	private static class FutureResponseData
+	{
+		public final Class<? extends AbstractTrackableMessage> responseClass;
+		public final CompletableFuture<AbstractTrackableMessage> future;
+		
+		private <T extends AbstractTrackableMessage> FutureResponseData(Class<T> responseClass, CompletableFuture<T> future)
+		{
+			this.responseClass = responseClass;
+			//noinspection unchecked
+			this.future = (CompletableFuture<AbstractTrackableMessage>) future;
+		}
+		
+	}
+	
+	/** Simple wrapper just to make the code here a bit more readable */
+	@FunctionalInterface
+	private interface INetworkMessageConsumer 
+	{
+		void accept(AbstractNetworkMessage message);
+	}
+	
+	
+}
@@ -0,0 +1,81 @@
+/*
+ *    This file is part of the Distant Horizons mod
+ *    licensed under the GNU LGPL v3 License.
+ *
+ *    Copyright (C) 2020-2023 James Seibel
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the GNU Lesser General Public License as published by
+ *    the Free Software Foundation, version 3.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU Lesser General Public License for more details.
+ *
+ *    You should have received a copy of the GNU Lesser General Public License
+ *    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.seibel.distanthorizons.core.network.event;
+
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+
+import java.util.function.Consumer;
+
+/** 
+ * Provides a way to register network message handlers which are expected to be removed later. <br><br>
+ * 
+ * In other words, listeners can be added to this {@link AbstractNetworkEventSource} and when
+ * you no longer need any of those listeners you can {@link ScopedNetworkEventSource#close()}
+ * this handler to remove all of them.
+ */
+public final class ScopedNetworkEventSource extends AbstractNetworkEventSource
+{
+	public final AbstractNetworkEventSource parent;
+	private boolean isClosed = false;
+	
+	private final Consumer<AbstractNetworkMessage> actualHandleMessageStable = this::handleMessage;
+	
+	
+	
+	//=============//
+	// constructor //
+	//=============//
+	
+	public ScopedNetworkEventSource(AbstractNetworkEventSource parent) { this.parent = parent; }
+	
+	
+	
+	//==================//
+	// message handlers //
+	//==================//
+	
+	@Override
+	public <T extends AbstractNetworkMessage> void registerHandler(Class<T> handlerClass, Consumer<T> handlerImplementation)
+	{
+		if (this.isClosed)
+		{
+			return;
+		}
+		
+		//noinspection unchecked
+		this.parent.registerHandler(this, handlerClass, (Consumer<T>) this.actualHandleMessageStable);
+		
+		super.registerHandler(this, handlerClass, handlerImplementation);
+	}
+	
+	
+	
+	//==========//
+	// shutdown //
+	//==========//
+	
+	@Override
+	public void close()
+	{
+		this.isClosed = true;
+		this.parent.removeAllHandlers(this);
+	}
+	
+}
@@ -0,0 +1,17 @@
+package com.seibel.distanthorizons.core.network.event.internal;
+
+import com.seibel.distanthorizons.core.network.messages.AbstractNetworkMessage;
+import io.netty.buffer.ByteBuf;
+
+/** internal events are messages sent from the client/sever back to themselves. */
+public abstract class AbstractInternalEvent extends AbstractNetworkMessage
+{
+	@Override
+	public void encode(ByteBuf out)
+	{ throw new UnsupportedOperationException(this.getClass().getSimpleName() + " is an internal event, and cannot be sent."); }
+
+	@Override
+	public void decode(ByteBuf in)
+	{ throw new UnsupportedOperationException(this.getClass().getSimpleName() + " is an internal event, and cannot be received."); }
+	
+}
@@ -0,0 +1,9 @@
+package com.seibel.distanthorizons.core.network.event.internal;
+
+/**
+ * This event is used to indicate a disconnect.
+ */
+public class CloseInternalEvent extends AbstractInternalEvent
+{
+	
+}
@@ -0,0 +1,15 @@
+package com.seibel.distanthorizons.core.network.event.internal;
+
+/**
+ * This event is received instead of a message if its protocol version is incompatible with version the mod uses.
+ */
+public class IncompatibleMessageInternalEvent extends AbstractInternalEvent
+{
+	public final int protocolVersion;
+	
+	public IncompatibleMessageInternalEvent(int protocolVersion)
+	{
+		this.protocolVersion = protocolVersion;
+	}
+	
+}
--- a/Show More
+++ b/Show More
				`@@ -0,0 +1 @@`
				`Distant Horizons logos © 2024 by Pankakes are licensed under CC BY-SA 4.0`
				`@@ -0,0 +1 @@`
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