Fix exceptions when closing a world

core/src/main/java/com/seibel/lod/core/dataObjects/transformers/ChunkToLodBuilder.java

@@ -9,12 +9,16 @@ import com.seibel.lod.core.logging.ConfigBasedLogger;
 import com.seibel.lod.core.pos.DhChunkPos;
 import com.seibel.lod.core.util.*;
 import com.seibel.lod.core.wrapperInterfaces.chunk.IChunkWrapper;
+import com.seibel.lod.core.wrapperInterfaces.minecraft.IMinecraftClientWrapper;
+import com.seibel.lod.core.dependencyInjection.SingletonInjector;
 import org.apache.logging.log4j.LogManager;
 
 //FIXME: To-Be-Used class
 public class ChunkToLodBuilder
 {
     public static final ConfigBasedLogger LOGGER = new ConfigBasedLogger(LogManager.getLogger(), () -> Config.Client.Advanced.Debugging.DebugSwitch.logLodBuilderEvent.get());
+	private static final IMinecraftClientWrapper MC = SingletonInjector.INSTANCE.get(IMinecraftClientWrapper.class);
+	
     public static final long MAX_TICK_TIME_NS = 1000000000L / 20L;
     public static final int THREAD_COUNT = 1;
 	
@@ -56,8 +60,25 @@ public class ChunkToLodBuilder
 	
     public void tick()
 	{
-        if (runningCount.get() >= THREAD_COUNT) return;
-        if (taskToBuild.isEmpty()) return;
+        if (runningCount.get() >= THREAD_COUNT)
+		{
+			return;
+		}
+        else if (taskToBuild.isEmpty())
+		{
+			return;
+		}
+		else if (!MC.playerExists())
+		{
+			// MC hasn't finished loading (or is currently unloaded)
+			
+			// TODO these should be cleared whenever a level is unloaded, 
+			//  but for now, just assume any previous chunks are invalid if the player doesn't exist 
+			taskToBuild.clear();
+			return;
+		}
+		
+		
         for (int i = 0; i<THREAD_COUNT; i++)
 		{
             runningCount.incrementAndGet();
@@ -65,7 +86,7 @@ public class ChunkToLodBuilder
 			{
                 try
 				{
-                    _tick();
+					_tick();
                 }
 				finally
 				{
@@ -82,8 +103,10 @@ public class ChunkToLodBuilder
         boolean allDone = false;
         while (true)
 		{
-            if (System.nanoTime() - time > MAX_TICK_TIME_NS && !taskToBuild.isEmpty()) 
+            if (System.nanoTime() - time > MAX_TICK_TIME_NS && !taskToBuild.isEmpty())
+			{
 				break;
+			}
 			
             Task task = taskToBuild.pollFirst();
             if (task == null)

core/src/main/java/com/seibel/lod/core/file/renderfile/RenderMetaDataFile.java

@@ -130,8 +130,6 @@ public class RenderMetaDataFile extends AbstractMetaDataContainerFile
 		return null;
 	}
 	
-    // Cause: Generic Type runtime casting cannot safety check it.
-	// However, the Union type ensures the 'data' should only contain the listed type.
 	public CompletableFuture<ColumnRenderSource> loadOrGetCached(Executor fileReaderThreads, IDhLevel level)
 	{
 		Object obj = this.data.get();

core/src/main/java/com/seibel/lod/core/render/LodRenderSection.java

@@ -48,7 +48,10 @@ public class LodRenderSection
 			return;
 		}
 		
-		this.loadFuture = this.renderSourceProvider.read(this.pos);
+		if (this.renderSource == null)
+		{
+			this.loadFuture = this.renderSourceProvider.read(this.pos);
+		}
 		this.isRenderEnabled = true;
     }
     public void disableRender()

core/src/main/java/com/seibel/lod/core/wrapperInterfaces/world/ILevelWrapper.java

@@ -66,4 +66,7 @@ public interface ILevelWrapper extends IDhApiLevelWrapper, IBindable
 	@Override
 	Object getWrappedMcObject_UNSAFE();
 	
+	// TODO implement onUnload
+	//  necessary so ChunkToLodBuilder can have its cache cleared after the level closes
+	
 }