From 15bff8984584cdb609079bd13e99af4ed845243a Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 5 Jun 2018 00:32:22 -0400
Subject: [PATCH] Configurable Villages loading chunks for door checks

This avoids villages spam loading chunks sync.

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index af6b97708a..a005c8c4ec 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -420,4 +420,12 @@ public class PaperWorldConfig {
         disableEnderpearlExploit = getBoolean("game-mechanics.disable-unloaded-chunk-enderpearl-exploit", disableEnderpearlExploit);
         log("Disable Unloaded Chunk Enderpearl Exploit: " + (disableEnderpearlExploit ? "enabled" : "disabled"));
     }
+
+    public boolean villagesLoadChunks = false;
+    private void villagesLoadChunks() {
+        villagesLoadChunks = getBoolean("game-mechanics.villages-load-chunks", false);
+        if (villagesLoadChunks) {
+            log("Villages can load chunks - Warning this can cause intense TPS loss. Strongly consider disabling this.");
+        }
+    }
 }
diff --git a/src/main/java/net/minecraft/server/PersistentVillage.java b/src/main/java/net/minecraft/server/PersistentVillage.java
index d14a9e3a3e..0be1bf0d99 100644
--- a/src/main/java/net/minecraft/server/PersistentVillage.java
+++ b/src/main/java/net/minecraft/server/PersistentVillage.java
@@ -123,7 +123,7 @@ public class PersistentVillage extends PersistentBase {
             for(int j = -4; j < 4; ++j) {
                 for(int k = -16; k < 16; ++k) {
                     blockposition$mutableblockposition.g(blockposition).d(i, j, k);
-                    IBlockData iblockdata = this.world.getType(blockposition$mutableblockposition);
+                    IBlockData iblockdata = this.world.paperConfig.villagesLoadChunks ? this.world.getType(blockposition$mutableblockposition) : this.world.getTypeIfLoaded(blockposition$mutableblockposition); // Paper
                     if (this.a(iblockdata)) {
                         VillageDoor villagedoor = this.c(blockposition$mutableblockposition);
                         if (villagedoor == null) {
@@ -193,7 +193,7 @@ public class PersistentVillage extends PersistentBase {
     }
 
     private boolean a(IBlockData iblockdata) {
-        return iblockdata.getBlock() instanceof BlockDoor && iblockdata.getMaterial() == Material.WOOD;
+        return iblockdata != null && iblockdata.getBlock() instanceof BlockDoor && iblockdata.getMaterial() == Material.WOOD; // Paper
     }
 
     public void a(NBTTagCompound nbttagcompound) {
diff --git a/src/main/java/net/minecraft/server/Village.java b/src/main/java/net/minecraft/server/Village.java
index bda67faefe..0414f003a5 100644
--- a/src/main/java/net/minecraft/server/Village.java
+++ b/src/main/java/net/minecraft/server/Village.java
@@ -297,7 +297,7 @@ public class Village {
                 villagedoor.a();
             }
 
-            if (!this.g(villagedoor.d()) || Math.abs(this.g - villagedoor.h()) > 1200) {
+            if ((!this.g(villagedoor.d()) || Math.abs(this.g - villagedoor.h()) > 1200) && this.a.isLoaded(villagedoor.d())) { // Paper - don't expire doors unless the chunk is loaded, use same param as the first conditional and the one below checks
                 this.c = this.c.b(villagedoor.d());
                 flag = true;
                 villagedoor.a(true);
@@ -312,7 +312,9 @@ public class Village {
     }
 
     private boolean g(BlockPosition blockposition) {
-        IBlockData iblockdata = this.a.getType(blockposition);
+        IBlockData iblockdata = this.a.paperConfig.villagesLoadChunks ? this.a.getType(blockposition) : this.a.getTypeIfLoaded(blockposition); // Paper
+        if (iblockdata == null) return false; // Paper
+
         Block block = iblockdata.getBlock();
 
         return block instanceof BlockDoor ? iblockdata.getMaterial() == Material.WOOD : false;
-- 
2.19.0