Paper/CraftBukkit-Patches/0011-Async-Operation-Catching.patch

From 0f5ec7aa26d818aa3a78f920c75ecf28c4e6b7b5 Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Thu, 7 Mar 2013 20:12:46 +1100
Subject: [PATCH] Async Operation Catching

Catch and throw an exception when a potentially unsafe operation occurs on a thread other than the main server thread.

diff --git a/src/main/java/net/minecraft/server/Block.java b/src/main/java/net/minecraft/server/Block.java
index ad4e3a2..c063ca1 100644
--- a/src/main/java/net/minecraft/server/Block.java
+++ b/src/main/java/net/minecraft/server/Block.java
@@ -433,9 +433,13 @@ public class Block {
         return 10;
     }
 
-    public void onPlace(World world, int i, int j, int k) {}
+    public void onPlace(World world, int i, int j, int k) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous block onPlace!"); // Spigot
+    }
 
-    public void remove(World world, int i, int j, int k, Block block, int l) {}
+    public void remove(World world, int i, int j, int k, Block block, int l) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous block remove!"); // Spigot
+    }
 
     public int a(Random random) {
         return 1;
diff --git a/src/main/java/net/minecraft/server/EntityTracker.java b/src/main/java/net/minecraft/server/EntityTracker.java
index 7447e42..97d0bbb 100644
--- a/src/main/java/net/minecraft/server/EntityTracker.java
+++ b/src/main/java/net/minecraft/server/EntityTracker.java
@@ -91,6 +91,7 @@ public class EntityTracker {
     }
 
     public void addEntity(Entity entity, int i, int j, boolean flag) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous entity track!"); // Spigot
         if (i > this.e) {
             i = this.e;
         }
@@ -125,6 +126,7 @@ public class EntityTracker {
     }
 
     public void untrackEntity(Entity entity) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous entity untrack!"); // Spigot
         if (entity instanceof EntityPlayer) {
             EntityPlayer entityplayer = (EntityPlayer) entity;
             Iterator iterator = this.c.iterator();
diff --git a/src/main/java/net/minecraft/server/EntityTrackerEntry.java b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
index 9f818cf..8052ea6 100644
--- a/src/main/java/net/minecraft/server/EntityTrackerEntry.java
+++ b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
@@ -299,6 +299,7 @@ public class EntityTrackerEntry {
     }
 
     public void updatePlayer(EntityPlayer entityplayer) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous player tracker update!"); // Spigot
         if (entityplayer != this.tracker) {
             double d0 = entityplayer.locX - (double) (this.xLoc / 32);
             double d1 = entityplayer.locZ - (double) (this.zLoc / 32);
@@ -515,6 +516,7 @@ public class EntityTrackerEntry {
     }
 
     public void clear(EntityPlayer entityplayer) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous player tracker clear!"); // Spigot
         if (this.trackedPlayers.contains(entityplayer)) {
             this.trackedPlayers.remove(entityplayer);
             entityplayer.removeQueue.add(Integer.valueOf(this.tracker.getId()));
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 97b991b..aca2455 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -903,6 +903,7 @@ public abstract class World implements IBlockAccess {
     }
 
     public boolean addEntity(Entity entity, SpawnReason spawnReason) { // Changed signature, added SpawnReason
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous entity add!"); // Spigot
         if (entity == null) return false;
         // CraftBukkit end
 
@@ -1009,6 +1010,7 @@ public abstract class World implements IBlockAccess {
     }
 
     public void removeEntity(Entity entity) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous entity remove!"); // Spigot
         entity.die();
         if (entity instanceof EntityHuman) {
             this.players.remove(entity);
@@ -2397,6 +2399,7 @@ public abstract class World implements IBlockAccess {
     }
 
     public void a(List list) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous entity world add!"); // Spigot
         // CraftBukkit start
         // this.entityList.addAll(list);
         Entity entity = null;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 5938b37..0f21e89 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -159,6 +159,7 @@ public class CraftWorld implements World {
     }
 
     public boolean unloadChunkRequest(int x, int z, boolean safe) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous chunk unload!"); // Spigot
         if (safe && isChunkInUse(x, z)) {
             return false;
         }
@@ -169,6 +170,7 @@ public class CraftWorld implements World {
     }
 
     public boolean unloadChunk(int x, int z, boolean save, boolean safe) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous chunk unload!"); // Spigot
         if (safe && isChunkInUse(x, z)) {
             return false;
         }
@@ -236,6 +238,7 @@ public class CraftWorld implements World {
     }
 
     public boolean loadChunk(int x, int z, boolean generate) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous chunk load!"); // Spigot
         chunkLoadCount++;
         if (generate) {
             // Use the default variant of loadChunk when generate == true.
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index 9add7bf..0b8b324 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -230,6 +230,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
 
     @Override
     public void kickPlayer(String message) {
+        if (Thread.currentThread() != MinecraftServer.getServer().primaryThread) throw new IllegalStateException("Asynchronous player kick!"); // Spigot
         if (getHandle().playerConnection == null) return;
 
         getHandle().playerConnection.disconnect(message == null ? "" : message);
-- 
1.8.3.2