Implement new AsyncPlayerChatEvent. Addresses BUKKIT-2064

Added two utility collections for use with PlayerChatEvents allowing lazier
initialization of events and less need to synchronize against the player
list.

Provided a hidden queue system for similar logic to pre-1.3 chat. When a
plugin is listening for the deprecated PlayerChatEvent, all chat will be
delayed to be mirror executed from the main thread. All developers are
encouraged to immediately update to the developmental Bukkit chat API as a
minimum transition for server stability.

Additionally, changes were required to bring thread-safety to the flow
logic. CopyOnWriteArrayList is the only viable means to produce thread
safety with minimal diff; using a sane pre-implemented collection would
require reworking of sections of NMS logic.

As a minor change, implemented expected functionality for
PlayerCommandPreProcessEvent. Setting the player should now change the
player executing the command.

src/main/java/net/minecraft/server/MinecraftServer.java

@@ -19,6 +19,7 @@ import joptsimple.OptionSet;
 import org.bukkit.World.Environment;
 import org.bukkit.event.server.RemoteServerCommandEvent;
 import org.bukkit.event.world.WorldSaveEvent;
+import org.bukkit.event.player.PlayerChatEvent;
 // CraftBukkit end
 
 public abstract class MinecraftServer implements Runnable, IMojangStatistics, ICommandListener {
@@ -78,6 +79,7 @@ public abstract class MinecraftServer implements Runnable, IMojangStatistics, IC
     public ConsoleReader reader;
     public static int currentTick;
     public final Thread primaryThread;
+    public java.util.Queue<PlayerChatEvent> chatQueue = new java.util.concurrent.ConcurrentLinkedQueue<PlayerChatEvent>();
     // CraftBukkit end
 
     public MinecraftServer(OptionSet options) { // CraftBukkit - signature file -> OptionSet
@@ -509,6 +511,28 @@ public abstract class MinecraftServer implements Runnable, IMojangStatistics, IC
         // CraftBukkit start - only send timeupdates to the people in that world
         this.server.getScheduler().mainThreadHeartbeat(this.ticks);
 
+        // Fix for old plugins still using deprecated event
+        while (!chatQueue.isEmpty()) {
+            PlayerChatEvent event = chatQueue.remove();
+            org.bukkit.Bukkit.getPluginManager().callEvent(event);
+
+            if (event.isCancelled()) {
+                continue;
+            }
+
+            String message = String.format(event.getFormat(), event.getPlayer().getDisplayName(), event.getMessage());
+            console.sendMessage(message);
+            if (((org.bukkit.craftbukkit.util.LazyPlayerSet) event.getRecipients()).isLazy()) {
+                for (Object player : getServerConfigurationManager().players) {
+                    ((EntityPlayer) player).sendMessage(message);
+                }
+            } else {
+                for (org.bukkit.entity.Player player : event.getRecipients()) {
+                    player.sendMessage(message);
+                }
+            }
+        }
+
         // Send timeupdates to everyone, it will get the right time from the world the player is in.
         if (this.ticks % 20 == 0) {
             for (int i = 0; i < this.getServerConfigurationManager().players.size(); ++i) {

src/main/java/net/minecraft/server/NetServerHandler.java

@@ -16,12 +16,14 @@ import java.util.HashSet;
 import org.bukkit.Location;
 import org.bukkit.craftbukkit.inventory.CraftInventoryView;
 import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.util.LazyPlayerSet;
 import org.bukkit.craftbukkit.entity.CraftPlayer;
 import org.bukkit.craftbukkit.event.CraftEventFactory;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Event;
 import org.bukkit.event.block.Action;
 import org.bukkit.event.block.SignChangeEvent;
+import org.bukkit.event.player.AsyncPlayerChatEvent;
 import org.bukkit.event.player.PlayerAnimationEvent;
 import org.bukkit.event.player.PlayerChatEvent;
 import org.bukkit.event.player.PlayerCommandPreprocessEvent;
@@ -801,12 +803,12 @@ public class NetServerHandler extends NetHandler {
                     return;
                 }
 
-                this.chat(s);
+                this.chat(s, packet3chat.a_());
             }
         }
     }
 
-    public boolean chat(String s) {
+    public boolean chat(String s, boolean async) {
         if (!this.player.dead) {
             if (s.length() == 0) {
                 logger.warning(this.player.name + " tried to send an empty message");
@@ -823,17 +825,26 @@ public class NetServerHandler extends NetHandler {
                 return true;
             } else {
                 Player player = this.getPlayer();
-                PlayerChatEvent event = new PlayerChatEvent(player, s);
+                AsyncPlayerChatEvent event = new AsyncPlayerChatEvent(async, player, s, new LazyPlayerSet());
                 this.server.getPluginManager().callEvent(event);
 
-                if (event.isCancelled()) {
-                    return true;
-                }
-
-                s = String.format(event.getFormat(), event.getPlayer().getDisplayName(), event.getMessage());
-                minecraftServer.console.sendMessage(s);
-                for (Player recipient : event.getRecipients()) {
-                    recipient.sendMessage(s);
+                if (PlayerChatEvent.getHandlerList().getRegisteredListeners().length != 0) {
+                    // Evil plugins still listening to deprecated event
+                    PlayerChatEvent queueEvent = new PlayerChatEvent(player, event.getMessage(), event.getFormat(), event.getRecipients());
+                    queueEvent.setCancelled(event.isCancelled());
+                    minecraftServer.chatQueue.add(queueEvent);
+                } else {
+                    s = String.format(event.getFormat(), event.getPlayer().getDisplayName(), event.getMessage());
+                    minecraftServer.console.sendMessage(s);
+                    if (((LazyPlayerSet) event.getRecipients()).isLazy()) {
+                        for (Object recipient : minecraftServer.getServerConfigurationManager().players) {
+                            ((EntityPlayer) recipient).sendMessage(s);
+                        }
+                    } else {
+                        for (org.bukkit.entity.Player recipient : event.getRecipients()) {
+                            recipient.sendMessage(s);
+                        }
+                    }
                 }
             }
 
@@ -851,7 +862,7 @@ public class NetServerHandler extends NetHandler {
         // CraftBukkit start
         CraftPlayer player = this.getPlayer();
 
-        PlayerCommandPreprocessEvent event = new PlayerCommandPreprocessEvent(player, s);
+        PlayerCommandPreprocessEvent event = new PlayerCommandPreprocessEvent(player, s, new LazyPlayerSet());
         this.server.getPluginManager().callEvent(event);
 
         if (event.isCancelled()) {
@@ -859,7 +870,7 @@ public class NetServerHandler extends NetHandler {
         }
 
         try {
-            if (this.server.dispatchCommand(player, event.getMessage().substring(1))) {
+            if (this.server.dispatchCommand(event.getPlayer(), event.getMessage().substring(1))) {
                 return;
             }
         } catch (org.bukkit.command.CommandException ex) {

src/main/java/net/minecraft/server/ServerConfigurationManagerAbstract.java

@@ -30,7 +30,7 @@ public abstract class ServerConfigurationManagerAbstract {
     private static final SimpleDateFormat e = new SimpleDateFormat("yyyy-MM-dd \'at\' HH:mm:ss z");
     public static final Logger a = Logger.getLogger("Minecraft");
     private final MinecraftServer server;
-    public final List players = new ArrayList();
+    public final List players = new java.util.concurrent.CopyOnWriteArrayList(); // CraftBukkit - ArrayList -> CopyOnWriteArrayList: Iterator safety
     private final BanList banByName = new BanList(new File("banned-players.txt"));
     private final BanList banByIP = new BanList(new File("banned-ips.txt"));
     private Set operators = new HashSet();

src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -229,7 +229,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     public void chat(String msg) {
         if (getHandle().netServerHandler == null) return;
 
-        getHandle().netServerHandler.chat(msg);
+        getHandle().netServerHandler.chat(msg, false);
     }
 
     public boolean performCommand(String command) {

src/main/java/org/bukkit/craftbukkit/util/LazyHashSet.java

@@ -0,0 +1,98 @@
+package org.bukkit.craftbukkit.util;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.Set;
+
+
+public abstract class LazyHashSet<E> implements Set<E> {
+    Set<E> reference = null;
+
+    public int size() {
+        return getReference().size();
+    }
+
+    public boolean isEmpty() {
+        return getReference().isEmpty();
+    }
+
+    public boolean contains(Object o) {
+        return getReference().contains(o);
+    }
+
+    public Iterator<E> iterator() {
+        return getReference().iterator();
+    }
+
+    public Object[] toArray() {
+        return getReference().toArray();
+    }
+
+    public <T> T[] toArray(T[] a) {
+        return getReference().toArray(a);
+    }
+
+    public boolean add(E o) {
+        return getReference().add(o);
+    }
+
+    public boolean remove(Object o) {
+        return getReference().remove(o);
+    }
+
+    public boolean containsAll(Collection<?> c) {
+        return getReference().containsAll(c);
+    }
+
+    public boolean addAll(Collection<? extends E> c) {
+        return getReference().addAll(c);
+    }
+
+    public boolean retainAll(Collection<?> c) {
+        return getReference().retainAll(c);
+    }
+
+    public boolean removeAll(Collection<?> c) {
+        return getReference().removeAll(c);
+    }
+
+    public void clear() {
+        getReference().clear();
+    }
+
+    public Set<E> getReference() {
+        Set<E> reference = this.reference ;
+        if (reference != null) {
+            return reference;
+        }
+        return this.reference = makeReference();
+    }
+
+    abstract Set<E> makeReference();
+
+    public boolean isLazy() {
+        return reference == null;
+    }
+
+    @Override
+    public int hashCode() {
+        return 157 * getReference().hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (obj == null || this.getClass() != obj.getClass()) {
+            return false;
+        }
+        LazyHashSet<?> that = (LazyHashSet<?>) obj;
+        return (this.isLazy() && that.isLazy()) || this.getReference().equals(that.getReference());
+    }
+
+    @Override
+    public String toString() {
+        return getReference().toString();
+    }
+}

src/main/java/org/bukkit/craftbukkit/util/LazyPlayerSet.java

@@ -0,0 +1,25 @@
+package org.bukkit.craftbukkit.util;
+
+import java.util.HashSet;
+import java.util.List;
+import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.MinecraftServer;
+
+import org.bukkit.entity.Player;
+
+public class LazyPlayerSet extends LazyHashSet<Player> {
+
+    @Override
+    HashSet<Player> makeReference() {
+        if (reference != null) {
+            throw new IllegalStateException("Reference already created!");
+        }
+        List<EntityPlayer> players = MinecraftServer.getServer().getServerConfigurationManager().players;
+        HashSet<Player> reference = new HashSet<Player>(players.size());
+        for (EntityPlayer player : players) {
+            reference.add(player.getBukkitEntity());
+        }
+        return reference;
+    }
+
+}