PaperMC/Spigot-Server-Patches/0386-improve-CraftWorld-isChunkLoaded.patch

From b5079bb58d1c535dc36ee860218926d43f818f48 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Tue, 21 May 2019 02:34:04 +0100
Subject: [PATCH] improve CraftWorld#isChunkLoaded

getChunkAt will request the chunk using vanillas chunk loading system,
which while we're not going to load the chunk, does involve the server
waiting for the execution queue to get to our request; We can just query
the chunk status and get a response now, vs having to wait

diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 74f7b046ac..f613ae1da4 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -388,14 +388,13 @@ public class CraftWorld implements World {
 
     @Override
     public boolean isChunkLoaded(int x, int z) {
-        net.minecraft.server.Chunk chunk = world.getChunkProvider().getChunkAt(x, z, false);
-        return chunk != null;
+        return world.getChunkProvider().getChunkAtIfLoadedImmediately(x, z) != null; // Paper
     }
 
     @Override
     public boolean isChunkGenerated(int x, int z) {
         try {
-            return isChunkLoaded(x, z) || world.getChunkProvider().playerChunkMap.chunkExists(new ChunkCoordIntPair(x, z));
+            return world.getChunkProvider().getChunkAtIfCachedImmediately(x, z) != null || world.getChunkProvider().playerChunkMap.chunkExists(new ChunkCoordIntPair(x, z)); // Paper
         } catch (IOException ex) {
             throw new RuntimeException(ex);
         }
-- 
2.22.0