spigot/CraftBukkit-Patches/0007-Async-Operation-Catching.patch

From c8651ebe88df15eb12df958cccffb81ae543c0c4 Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Tue, 25 Mar 2014 16:10:01 +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 a7f942de8..a30b21ad2 100644
--- a/src/main/java/net/minecraft/server/Block.java
+++ b/src/main/java/net/minecraft/server/Block.java
@@ -374,10 +374,14 @@ public class Block implements IMaterial {
     }
 
     @Deprecated
-    public void onPlace(IBlockData iblockdata, World world, BlockPosition blockposition, IBlockData iblockdata1) {}
+    public void onPlace(IBlockData iblockdata, World world, BlockPosition blockposition, IBlockData iblockdata1) {
+        org.spigotmc.AsyncCatcher.catchOp( "block onPlace"); // Spigot
+    }
 
     @Deprecated
-    public void remove(IBlockData iblockdata, World world, BlockPosition blockposition, IBlockData iblockdata1, boolean flag) {}
+    public void remove(IBlockData iblockdata, World world, BlockPosition blockposition, IBlockData iblockdata1, boolean flag) {
+        org.spigotmc.AsyncCatcher.catchOp( "block remove"); // Spigot
+    }
 
     public int a(IBlockData iblockdata, Random random) {
         return 1;
diff --git a/src/main/java/net/minecraft/server/EntityLiving.java b/src/main/java/net/minecraft/server/EntityLiving.java
index f411c0378..2f9944ba5 100644
--- a/src/main/java/net/minecraft/server/EntityLiving.java
+++ b/src/main/java/net/minecraft/server/EntityLiving.java
@@ -725,6 +725,7 @@ public abstract class EntityLiving extends Entity {
     }
 
     public boolean addEffect(MobEffect mobeffect, EntityPotionEffectEvent.Cause cause) {
+        org.spigotmc.AsyncCatcher.catchOp( "effect add"); // Spigot
         if (isTickingEffects) {
             effectsToProcess.add(new ProcessableEffect(mobeffect, cause));
             return true;
diff --git a/src/main/java/net/minecraft/server/EntityTracker.java b/src/main/java/net/minecraft/server/EntityTracker.java
index ee261f25a..5cfa09fff 100644
--- a/src/main/java/net/minecraft/server/EntityTracker.java
+++ b/src/main/java/net/minecraft/server/EntityTracker.java
@@ -105,6 +105,7 @@ public class EntityTracker {
     }
 
     public void addEntity(Entity entity, int i, int j, boolean flag) {
+        org.spigotmc.AsyncCatcher.catchOp( "entity track"); // Spigot
         try {
             if (this.trackedEntities.b(entity.getId())) {
                 throw new IllegalStateException("Entity is already tracked!");
@@ -142,6 +143,7 @@ public class EntityTracker {
     }
 
     public void untrackEntity(Entity entity) {
+        org.spigotmc.AsyncCatcher.catchOp( "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 e6b492048..6a622f72e 100644
--- a/src/main/java/net/minecraft/server/EntityTrackerEntry.java
+++ b/src/main/java/net/minecraft/server/EntityTrackerEntry.java
@@ -324,6 +324,7 @@ public class EntityTrackerEntry {
     }
 
     public void updatePlayer(EntityPlayer entityplayer) {
+        org.spigotmc.AsyncCatcher.catchOp( "player tracker update"); // Spigot
         if (entityplayer != this.tracker) {
             if (this.c(entityplayer)) {
                 if (!this.trackedPlayers.contains(entityplayer) && (this.e(entityplayer) || this.tracker.attachedToPlayer)) {
@@ -567,6 +568,7 @@ public class EntityTrackerEntry {
     }
 
     public void clear(EntityPlayer entityplayer) {
+        org.spigotmc.AsyncCatcher.catchOp( "player tracker clear"); // Spigot
         if (this.trackedPlayers.contains(entityplayer)) {
             this.trackedPlayers.remove(entityplayer);
             this.tracker.c(entityplayer);
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index f51dbf185..fe95194e5 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -861,6 +861,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
     }
 
     public boolean addEntity(Entity entity, SpawnReason spawnReason) { // Changed signature, added SpawnReason
+        org.spigotmc.AsyncCatcher.catchOp( "entity add"); // Spigot
         if (entity == null) return false;
 
         org.bukkit.event.Cancellable event = null;
@@ -958,6 +959,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
     }
 
     public void kill(Entity entity) {
+        org.spigotmc.AsyncCatcher.catchOp( "entity kill"); // Spigot
         if (entity.isVehicle()) {
             entity.ejectPassengers();
         }
@@ -976,6 +978,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
     }
 
     public void removeEntity(Entity entity) {
+        org.spigotmc.AsyncCatcher.catchOp( "entity remove"); // Spigot
         entity.b(false);
         entity.die();
         if (entity instanceof EntityHuman) {
@@ -2193,6 +2196,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc
     }
 
     public void a(Stream<Entity> stream) {
+        org.spigotmc.AsyncCatcher.catchOp( "entity world add"); // Spigot
         stream.forEach((entity) -> {
             this.entityList.add(entity);
             this.b(entity);
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index e00b59959..7166ddb46 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -678,6 +678,7 @@ public final class CraftServer implements Server {
     public boolean dispatchCommand(CommandSender sender, String commandLine) {
         Validate.notNull(sender, "Sender cannot be null");
         Validate.notNull(commandLine, "CommandLine cannot be null");
+        org.spigotmc.AsyncCatcher.catchOp( "command dispatch" ); // Spigot
 
         if (commandMap.dispatch(sender, commandLine)) {
             return true;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index afd44feff..15dc0ffbe 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -189,6 +189,7 @@ public class CraftWorld implements World {
     }
 
     public boolean unloadChunkRequest(int x, int z, boolean safe) {
+        org.spigotmc.AsyncCatcher.catchOp( "chunk unload"); // Spigot
         if (safe && isChunkInUse(x, z)) {
             return false;
         }
@@ -202,6 +203,7 @@ public class CraftWorld implements World {
     }
 
     public boolean unloadChunk(int x, int z, boolean save, boolean safe) {
+        org.spigotmc.AsyncCatcher.catchOp( "chunk unload" ); // Spigot
         if (isChunkInUse(x, z)) {
             return false;
         }
@@ -220,6 +222,7 @@ public class CraftWorld implements World {
     }
 
     public boolean regenerateChunk(int x, int z) {
+        org.spigotmc.AsyncCatcher.catchOp( "chunk regenerate" ); // Spigot
         if (!unloadChunk0(x, z, false)) {
             return false;
         }
@@ -265,6 +268,7 @@ public class CraftWorld implements World {
     }
 
     public boolean loadChunk(int x, int z, boolean generate) {
+        org.spigotmc.AsyncCatcher.catchOp( "chunk load"); // Spigot
         chunkLoadCount++;
         return world.getChunkProvider().getChunkAt(x, z, true, generate) != null;
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
index f77241361..99226bffd 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
@@ -293,6 +293,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
 
     @Override
     public void kickPlayer(String message) {
+        org.spigotmc.AsyncCatcher.catchOp( "player kick"); // Spigot
         if (getHandle().playerConnection == null) return;
 
         getHandle().playerConnection.disconnect(message == null ? "" : message);
diff --git a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboardManager.java b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboardManager.java
index cac87d306..9cce899f5 100644
--- a/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboardManager.java
+++ b/src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboardManager.java
@@ -43,6 +43,7 @@ public final class CraftScoreboardManager implements ScoreboardManager {
     }
 
     public CraftScoreboard getNewScoreboard() {
+        org.spigotmc.AsyncCatcher.catchOp( "scoreboard creation"); // Spigot
         CraftScoreboard scoreboard = new CraftScoreboard(new ScoreboardServer(server));
         scoreboards.add(scoreboard);
         return scoreboard;
diff --git a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
index ae3481ba8..a0cdd2317 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java
@@ -13,6 +13,7 @@ public class ServerShutdownThread extends Thread {
     @Override
     public void run() {
         try {
+            org.spigotmc.AsyncCatcher.enabled = false; // Spigot
             server.stop();
         } catch (ExceptionWorldConflict ex) {
             ex.printStackTrace();
diff --git a/src/main/java/org/spigotmc/AsyncCatcher.java b/src/main/java/org/spigotmc/AsyncCatcher.java
new file mode 100644
index 000000000..4b3aa85c9
--- /dev/null
+++ b/src/main/java/org/spigotmc/AsyncCatcher.java
@@ -0,0 +1,17 @@
+package org.spigotmc;
+
+import net.minecraft.server.MinecraftServer;
+
+public class AsyncCatcher
+{
+
+    public static boolean enabled = true;
+
+    public static void catchOp(String reason)
+    {
+        if ( enabled && Thread.currentThread() != MinecraftServer.getServer().primaryThread )
+        {
+            throw new IllegalStateException( "Asynchronous " + reason + "!" );
+        }
+    }
+}
-- 
2.19.1