Add asynchronous event API from issue #200
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api/src/main/java/net/md_5/bungee/api/event/AsyncEvent.java
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72
api/src/main/java/net/md_5/bungee/api/event/AsyncEvent.java
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@ -0,0 +1,72 @@
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package net.md_5.bungee.api.event;
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import com.google.common.base.Preconditions;
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import java.util.Collections;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicInteger;
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import lombok.Data;
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import lombok.EqualsAndHashCode;
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import lombok.ToString;
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import net.md_5.bungee.api.Callback;
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import net.md_5.bungee.api.plugin.Event;
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import net.md_5.bungee.api.plugin.Plugin;
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/**
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* Represents an event which depends on the result of asynchronous operations.
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*/
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@Data
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@ToString(callSuper = true)
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@EqualsAndHashCode(callSuper = true)
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public class AsyncEvent extends Event
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{
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private final Callback done;
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private final Set<Plugin> intents = Collections.newSetFromMap( new ConcurrentHashMap<Plugin, Boolean>() );
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private final AtomicBoolean fired = new AtomicBoolean();
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private final AtomicInteger latch = new AtomicInteger();
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@Override
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@SuppressWarnings("unchecked")
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public void postCall()
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{
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fired.set( true );
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if ( latch.get() == 0 )
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{
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done.done( this, null );
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}
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}
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/**
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* Register an intent that this plugin will continue to perform work on a
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* background task, and wishes to let the event proceed once the registered
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* background task has completed.
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*
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* @param plugin the plugin registering this intent
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*/
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public void registerIntent(Plugin plugin)
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{
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Preconditions.checkState( !fired.get(), "Event %s has already been fired", this );
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Preconditions.checkState( !intents.contains( plugin ), "Plugin %s already registered intent for event %s", plugin, this );
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intents.add( plugin );
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}
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/**
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* Notifies this event that this plugin has done all its required processing
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* and wishes to let the event proceed.
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*
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* @param plugin a plugin which has an intent registered for this evemt
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*/
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@SuppressWarnings("unchecked")
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public void completeIntent(Plugin plugin)
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{
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Preconditions.checkState( intents.contains( plugin ), "Plugin %s has not registered intent for event %s", plugin, this );
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intents.remove( plugin );
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if ( latch.decrementAndGet() == 0 )
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{
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done.done( this, null );
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}
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}
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}
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@ -5,4 +5,11 @@ package net.md_5.bungee.api.plugin;
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*/
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public abstract class Event
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{
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/**
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* Method called after this event has been dispatched to all handlers.
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*/
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public void postCall()
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{
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}
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}
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@ -227,8 +227,11 @@ public class PluginManager
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*/
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public <T extends Event> T callEvent(T event)
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{
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Preconditions.checkNotNull( event, "event" );
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long start = System.nanoTime();
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eventBus.post( event );
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event.postCall();
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// TODO: No exceptions!
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if ( !( event instanceof LoginEvent ) )
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{
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@ -1,6 +1,7 @@
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package net.md_5.bungee.tablist;
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import java.util.Map;
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import java.util.Collections;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import net.md_5.bungee.BungeeCord;
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import net.md_5.bungee.UserConnection;
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@ -12,9 +13,7 @@ import net.md_5.bungee.packet.PacketC9PlayerListItem;
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public class GlobalTabList implements TabListHandler
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{
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// Sweet trick to avoid locking, basically reimplement HashSet based on a ConcurrentHashMap
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private static final Object PRESENT = new Object();
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private final Map<ProxiedPlayer, Object> sentPings = new ConcurrentHashMap<>();
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private final Set<ProxiedPlayer> sentPings = Collections.newSetFromMap( new ConcurrentHashMap<ProxiedPlayer, Boolean>() );
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@Override
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public void onConnect(ProxiedPlayer player)
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@ -22,7 +21,7 @@ public class GlobalTabList implements TabListHandler
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UserConnection con = (UserConnection) player;
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for ( ProxiedPlayer p : ProxyServer.getInstance().getPlayers() )
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{
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con.sendPacket(new PacketC9PlayerListItem( p.getDisplayName(), true, p.getPing() ) );
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con.sendPacket( new PacketC9PlayerListItem( p.getDisplayName(), true, p.getPing() ) );
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}
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BungeeCord.getInstance().broadcast( new PacketC9PlayerListItem( player.getDisplayName(), true, player.getPing() ) );
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}
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@ -30,10 +29,10 @@ public class GlobalTabList implements TabListHandler
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@Override
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public void onPingChange(ProxiedPlayer player, int ping)
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{
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if ( !sentPings.containsKey( player ) )
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if ( !sentPings.contains( player ) )
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{
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BungeeCord.getInstance().broadcast( new PacketC9PlayerListItem( player.getDisplayName(), true, player.getPing() ) );
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sentPings.put( player, PRESENT );
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sentPings.add( player );
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}
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}
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