papermc/CraftBukkit-Patches/0012-Async-Operation-Catching.patch

From dafcb9453f2b6debf6e9613b3a402a85f28e654a 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 afe8735..8fc6c12 100644
--- a/src/main/java/net/minecraft/server/Block.java
+++ b/src/main/java/net/minecraft/server/Block.java
@@ -342,9 +342,13 @@ 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, int l, int i1) {}
+    public void remove(World world, int i, int j, int k, int l, int i1) {
+        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 1d9203b..ebbef6a 100644
--- a/src/main/java/net/minecraft/server/EntityTracker.java
+++ b/src/main/java/net/minecraft/server/EntityTracker.java
@@ -87,6 +87,7 @@ 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.d) {
             i = this.d;
         }
@@ -122,6 +123,7 @@ 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.b.iterator();
diff --git a/src/main/java/net/minecraft/server/EntityTrackerEntry.java b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
index 8545b50..1f5a652 100644
--- a/src/main/java/net/minecraft/server/EntityTrackerEntry.java
+++ b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
@@ -297,6 +297,7 @@ 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);
@@ -513,6 +514,7 @@ 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.id));
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 0968ed8..4ec4d08 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -925,6 +925,7 @@ 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
 
@@ -1031,6 +1032,7 @@ 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);
@@ -2448,6 +2450,7 @@ 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
         Entity entity = null;
         for (int i = 0; i < list.size(); ++i) {
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index fc71833..7601fb5 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 3cf0c28..988c6e7 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -218,6 +218,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     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);
-- 
1.8.1.2