Attempt to prevent thread starvation due to world gen

Hopefully this should help prevent issues on low end machines not loading in LODs

core/src/main/java/com/seibel/distanthorizons/core/file/fullDatafile/GeneratedFullDataSourceProvider.java

@@ -47,7 +47,15 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 {
 	private static final Logger LOGGER = DhLoggerBuilder.getLogger();
 	
-	public static final int MAX_WORLD_GEN_REQUESTS_PER_THREAD = 20; 
+	/** 
+	 * Having this number too high causes the system to become overwhelmed by
+	 * world gen requests and other jobs won't be done. <br>
+	 * IE: LODs won't update or render because world gen is hogging the CPU.
+	 * <br><br>
+	 * TODO this should be dynamically allocated based on CPU load
+	 *  and abilities.
+	 */
+	public static final int MAX_WORLD_GEN_REQUESTS_PER_THREAD = 2; 
 	
 	
 	private final AtomicReference<IFullDataSourceRetrievalQueue> worldGenQueueRef = new AtomicReference<>(null);
@@ -172,6 +180,15 @@ public class GeneratedFullDataSourceProvider extends FullDataSourceProviderV2 im
 		}
 		
 		
+		ThreadPoolExecutor fileExecutor = ThreadPoolUtil.getFileHandlerExecutor();
+		if (fileExecutor == null || fileExecutor.getQueue().size() >= MAX_UPDATE_TASK_COUNT / 2)
+		{
+			// don't queue additional world gen requests if the file handler is overwhelmed,
+			// otherwise LODs may not load in properly
+			return false;
+		}
+		
+		
 		int maxQueueCount = MAX_WORLD_GEN_REQUESTS_PER_THREAD * Config.Client.Advanced.MultiThreading.numberOfWorldGenerationThreads.get();
 		
 		if (this.delayedFullDataSourceSaveCache.getUnsavedCount() >= maxQueueCount)