From 520077f254b12175a1eafa23a41aad657b614329 Mon Sep 17 00:00:00 2001
From: CraftBukkit/Spigot <noreply+git-craftbukkit@papermc.io>
Date: Mon, 16 Jun 2014 19:01:55 -0500
Subject: [PATCH] Avoid checking for loaded chunks for lighting and entity
 ticking.

When a chunk is loaded the server tries to ensure it has its initial light
calculations done before sending it to the player. When ticking entities
the server tries to ensure the entity does not walk into an unloaded chunk.
To accomplish these the server checks a one chunk radius around the chunk
to be lit or a two chunk radius around the chunk the entity is in. These
lookups happen every tick even though their result is unlikely to change
that often. To reduce the cost of these checks we replace them with a
system to keep track of what neighbor chunks a chunk has loaded and update
it when chunks load or unload which is a much less frequent action. On a
server with ten players this change removes about 100,000 calls a tick to
LongObjectHashMap's containsKey method.

By: Travis Watkins <amaranth@ubuntu.com>
---
 .../craftbukkit/chunkio/ChunkIOProvider.java    | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/paper-server/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java b/paper-server/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
index 8feadd112a..1440349b96 100644
--- a/paper-server/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
+++ b/paper-server/src/main/java/org/bukkit/craftbukkit/chunkio/ChunkIOProvider.java
@@ -28,7 +28,7 @@ class ChunkIOProvider implements AsynchronousExecutor.CallBackProvider<QueuedChu
 
     // sync stuff
     public void callStage2(QueuedChunk queuedChunk, Chunk chunk) throws RuntimeException {
-        if(chunk == null) {
+        if (chunk == null) {
             // If the chunk loading failed just do it synchronously (may generate)
             queuedChunk.provider.originalGetChunkAt(queuedChunk.x, queuedChunk.z);
             return;
@@ -48,6 +48,21 @@ class ChunkIOProvider implements AsynchronousExecutor.CallBackProvider<QueuedChu
             server.getPluginManager().callEvent(new org.bukkit.event.world.ChunkLoadEvent(chunk.bukkitChunk, false));
         }
 
+        // Update neighbor counts
+        for (int x = -2; x < 3; x++) {
+            for (int z = -2; z < 3; z++) {
+                if (x == 0 && z == 0) {
+                    continue;
+                }
+
+                Chunk neighbor = queuedChunk.provider.getChunkIfLoaded(chunk.locX + x, chunk.locZ + z);
+                if (neighbor != null) {
+                    neighbor.setNeighborLoaded(-x, -z);
+                    chunk.setNeighborLoaded(x, z);
+                }
+            }
+        }
+
         chunk.a(queuedChunk.provider, queuedChunk.provider, queuedChunk.x, queuedChunk.z);
     }