From 0b5b0ef90ca93ca68ab9de1e93ece64799f32d4e Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 17 Apr 2016 17:27:09 -0400
Subject: [PATCH] Prevent Fire from loading chunks

This causes the nether to spam unload/reload chunks, plus overall
bad behavior.

diff --git a/src/main/java/net/minecraft/server/BlockFire.java b/src/main/java/net/minecraft/server/BlockFire.java
index b6caf4c8a..f3a278c0b 100644
--- a/src/main/java/net/minecraft/server/BlockFire.java
+++ b/src/main/java/net/minecraft/server/BlockFire.java
@@ -162,6 +162,7 @@ public class BlockFire extends Block {
                                 }
 
                                 blockposition_mutableblockposition.g(blockposition).d(l, j1, i1);
+                                if (!world.isLoaded(blockposition_mutableblockposition)) continue; // Paper
                                 int l1 = this.a((IWorldReader) world, (BlockPosition) blockposition_mutableblockposition);
 
                                 if (l1 > 0) {
@@ -207,10 +208,14 @@ public class BlockFire extends Block {
     }
 
     private void a(World world, BlockPosition blockposition, int i, Random random, int j, BlockPosition sourceposition) { // CraftBukkit add sourceposition
-        int k = this.f(world.getType(blockposition).getBlock());
+        // Paper start
+        final IBlockData iblockdata = world.getTypeIfLoaded(blockposition);
+        if (iblockdata == null) return;
+        int k = this.f(iblockdata.getBlock());
+        // Paper end
 
         if (random.nextInt(i) < k) {
-            IBlockData iblockdata = world.getType(blockposition);
+            //IBlockData iblockdata = world.getType(blockposition); // Paper
 
             // CraftBukkit start
             org.bukkit.block.Block theBlock = world.getWorld().getBlockAt(blockposition.getX(), blockposition.getY(), blockposition.getZ());
@@ -267,7 +272,11 @@ public class BlockFire extends Block {
             for (int k = 0; k < j; ++k) {
                 EnumDirection enumdirection = aenumdirection[k];
 
-                i = Math.max(this.g(iworldreader.getType(blockposition.shift(enumdirection)).getBlock()), i);
+                // Paper start
+                final IBlockData type = ((World)iworldreader).getTypeIfLoaded(blockposition.shift(enumdirection));
+                if (type == null) continue;
+                i = Math.max(this.g(type.getBlock()), i);
+                // Paper end
             }
 
             return i;
-- 
2.18.0