From 541d969c8eddf2af96f71344d64bbc79044b3cf3 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 29 Aug 2018 21:59:22 -0400
Subject: [PATCH] Optimize getChunkIfLoaded type calls

Uses optimized check to avoid major locks and large method.

Will improve inlining across many hot methods.

Improve getBrightness to not do double chunk map lookups.

diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 5462962c0..b9f8a86aa 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -380,7 +380,7 @@ public class ChunkProviderServer implements IChunkProvider {
                     continue;
                 }
 
-                Chunk neighbor = this.getChunkAt(chunk.locX + x, chunk.locZ + z, false, false);
+                Chunk neighbor = this.chunks.get(chunk.chunkKey); // Paper
                 if (neighbor != null) {
                     neighbor.setNeighborUnloaded(-x, -z);
                     chunk.setNeighborUnloaded(x, z);
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 67b20c056..b1c181a50 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -166,7 +166,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
     }
 
     public Chunk getChunkIfLoaded(int x, int z) {
-        return ((ChunkProviderServer) this.chunkProvider).getChunkAt(x, z, false, false);
+        return ((ChunkProviderServer) this.chunkProvider).chunks.get(ChunkCoordIntPair.a(x, z)); // Paper - optimize getChunkIfLoaded
     }
 
     protected World(IDataManager idatamanager, @Nullable PersistentCollection persistentcollection, WorldData worlddata, WorldProvider worldprovider, MethodProfiler methodprofiler, boolean flag, ChunkGenerator gen, org.bukkit.World.Environment env) {
@@ -722,7 +722,8 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
             blockposition = new BlockPosition(blockposition.getX(), 0, blockposition.getZ());
         }
 
-        return !blockposition.isValidLocation() ? enumskyblock.c : (!this.isLoaded(blockposition) ? enumskyblock.c : this.getChunkAtWorldCoords(blockposition).getBrightness(enumskyblock, blockposition)); // Paper
+        Chunk chunk; // Paper
+        return !blockposition.isValidLocation() ? enumskyblock.c : ((chunk = this.getChunkIfLoaded(blockposition)) == null ? enumskyblock.c : chunk.getBrightness(enumskyblock, blockposition)); // Paper - optimize ifChunkLoaded
     }
 
     public void a(EnumSkyBlock enumskyblock, BlockPosition blockposition, int i) {
@@ -1965,7 +1966,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
         if (blockposition.isInvalidYLocation()) { // Paper
             return false;
         } else {
-            Chunk chunk = this.chunkProvider.getChunkAt(blockposition.getX() >> 4, blockposition.getZ() >> 4, false, false);
+            Chunk chunk = this.getChunkIfLoaded(blockposition.getX() >> 4, blockposition.getZ() >> 4); // Paper - optimize ifLoaded
 
             return chunk != null && !chunk.isEmpty();
         }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index d42827d87..91404cc5a 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -217,7 +217,7 @@ public class CraftWorld implements World {
             return false;
         }
 
-        net.minecraft.server.Chunk chunk = world.getChunkProvider().getChunkAt(x, z, false, false);
+        net.minecraft.server.Chunk chunk = world.getChunkIfLoaded(x, z); // Paper - optimize ifLaoded
         if (chunk != null) {
             world.getChunkProvider().unload(chunk);
         }
@@ -236,7 +236,7 @@ public class CraftWorld implements World {
 
     private boolean unloadChunk0(int x, int z, boolean save) {
         Boolean result = MCUtil.ensureMain("Unload Chunk", () -> { // Paper - Ensure never async
-        net.minecraft.server.Chunk chunk = world.getChunkProvider().getChunkAt(x, z, false, false);
+        net.minecraft.server.Chunk chunk = world.getChunkIfLoaded(x, z); // Paper - optimize ifLoaded
         if (chunk == null) {
             return true;
         }
-- 
2.20.0