#2576: Allow plugins to register multiple intents for async events
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@ -1,8 +1,7 @@
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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.Map;
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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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@ -25,7 +24,7 @@ public class AsyncEvent<T> extends Event
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{
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private final Callback<T> done;
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private final Set<Plugin> intents = Collections.newSetFromMap( new ConcurrentHashMap<Plugin, Boolean>() );
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private final Map<Plugin, AtomicInteger> intents = new ConcurrentHashMap<Plugin, AtomicInteger>();
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private final AtomicBoolean fired = new AtomicBoolean();
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private final AtomicInteger latch = new AtomicInteger();
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@ -43,30 +42,40 @@ public class AsyncEvent<T> extends Event
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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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* background task has completed. Multiple intents can be registered by a
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* plugin, but the plugin must complete the same amount of intents for the
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* event to proceed.
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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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AtomicInteger intentCount = intents.get( plugin );
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if ( intentCount == null )
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{
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intents.put( plugin, new AtomicInteger( 1 ) );
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} else
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{
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intentCount.incrementAndGet();
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}
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latch.incrementAndGet();
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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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* Notifies this event that this plugin has completed an intent and wishes
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* to let the event proceed once all intents have been completed.
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*
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* @param plugin a plugin which has an intent registered for this event
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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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AtomicInteger intentCount = intents.get( plugin );
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Preconditions.checkState( intentCount != null && intentCount.get() > 0, "Plugin %s has not registered intents for event %s", plugin, this );
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intentCount.decrementAndGet();
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if ( fired.get() )
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{
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if ( latch.decrementAndGet() == 0 )
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