From ed36f876be22fd9feaf46b86d2f69971d513158d Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 21 Apr 2018 11:21:48 -0400
Subject: [PATCH] Configurable Allowance of Permanent Chunk Loaders

This disables the behavior that allows players to keep chunks permanently loaded
by default and allows server operators to enable it if they wish.

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 50d3483eb0..5b14973810 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -470,4 +470,9 @@ public class PaperWorldConfig {
                 break;
         }
     }
+    public boolean allowPermaChunkLoaders = false;
+    private void allowPermaChunkLoaders() {
+        allowPermaChunkLoaders = getBoolean("game-mechanics.allow-permanent-chunk-loaders", allowPermaChunkLoaders);
+        log("Allow Perma Chunk Loaders: " + (allowPermaChunkLoaders ? "enabled" : "disabled"));
+    }
 }
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 4973721243..0e0c7b1abe 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -111,7 +111,7 @@ public class ChunkProviderServer implements IChunkProvider {
         Long2ObjectMap long2objectmap = this.chunks;
 
         synchronized (this.chunks) {
-            Chunk chunk = this.getLoadedChunkAt(i, j);
+            Chunk chunk = world.paperConfig.allowPermaChunkLoaders ? getLoadedChunkAt(i, j) : getChunkIfLoaded(i, j); // Paper - Configurable perma chunk loaders
 
             return chunk != null ? chunk : this.loadChunkAt(i, j);
         }
-- 
2.18.0