Optimize BlockStateWrapper getter

common/src/main/java/com/seibel/distanthorizons/common/wrappers/block/BlockStateWrapper.java

@@ -167,6 +167,27 @@ public class BlockStateWrapper implements IBlockStateWrapper
 			return AIR;
 		}
 		
+		// pooling wrappers significantly improves chunk->LOD processing speed
+		// and also reduces GC pressure
+		BlockStateWrapper existingWrapper = WRAPPER_BY_BLOCK_STATE.get(blockState);
+		if (existingWrapper != null)
+		{
+			return existingWrapper;
+		}
+		
+		
+		
+		// synchronized so the API event only fires once per block
+		synchronized (WRAPPER_BY_BLOCK_STATE)
+		{
+			// if another thread already finished this block, use that wrapper
+			existingWrapper = WRAPPER_BY_BLOCK_STATE.get(blockState);
+			if (existingWrapper != null)
+			{
+				return existingWrapper;
+			}
+			
+			
 			// create a wrapper specifically for the API event to use
 			BlockStateWrapper apiWrapper = new BlockStateWrapper(blockState, levelWrapper, null);
 			DhApiBlockStateWrapperCreatedEvent.EventParam eventParam = new DhApiBlockStateWrapperCreatedEvent.EventParam(apiWrapper);
@@ -174,14 +195,19 @@ public class BlockStateWrapper implements IBlockStateWrapper
 			
 			if (!eventParam.getOverridesSet())
 			{
-			// no changes needed, use the existing object
+				// no API changes needed, use the existing object
+				WRAPPER_BY_BLOCK_STATE.putIfAbsent(blockState, apiWrapper);
 				return apiWrapper;
 			}
-		
+			else
+			{
 				// create a new wrapper using whatever overrides the API user set
 				BlockStateWrapper returnWrapper = new BlockStateWrapper(blockState, levelWrapper, eventParam);
+				WRAPPER_BY_BLOCK_STATE.putIfAbsent(blockState, returnWrapper);
 				return returnWrapper;
 			}
+		}
+	}
 	private BlockStateWrapper(
 		@Nullable BlockState blockState, ILevelWrapper levelWrapper, 
 		@Nullable DhApiBlockStateWrapperCreatedEvent.EventParam overrideEventParam)
@@ -1000,6 +1026,7 @@ public class BlockStateWrapper implements IBlockStateWrapper
 			// put if absent in case two threads deserialize at the same time
 			// unfortunately we can't put everything in a computeIfAbsent() since we also throw exceptions
 			WRAPPER_BY_RESOURCE_LOCATION.putIfAbsent(finalResourceStateString, foundWrapper);
+			WRAPPER_BY_BLOCK_STATE.putIfAbsent(foundWrapper.blockState, foundWrapper);
 		}
 	}