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WELD-1496 Optimize context activation/deactivation events
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| /* | ||
| * JBoss, Home of Professional Open Source | ||
| * Copyright 2013, Red Hat, Inc., and individual contributors | ||
| * by the @authors tag. See the copyright.txt in the distribution for a | ||
| * full listing of individual contributors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.jboss.weld.event; | ||
|
|
||
| import java.lang.annotation.Annotation; | ||
| import java.lang.reflect.Type; | ||
| import java.util.Set; | ||
|
|
||
| import javax.enterprise.event.Event; | ||
| import javax.enterprise.inject.Instance; | ||
| import javax.enterprise.inject.spi.EventMetadata; | ||
| import javax.enterprise.inject.spi.InjectionPoint; | ||
| import javax.enterprise.inject.spi.ObserverMethod; | ||
| import javax.enterprise.util.TypeLiteral; | ||
|
|
||
| import org.jboss.weld.injection.attributes.WeldInjectionPointAttributes; | ||
| import org.jboss.weld.manager.BeanManagerImpl; | ||
|
|
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| import com.google.common.collect.ImmutableSet; | ||
|
|
||
| /** | ||
| * An optimized internal facility for dispatching events. | ||
| * | ||
| * <p> | ||
| * FastEvent eliminates most of the overhead associated with request dispatching by resolving observer methods upfront. It is therefore suitable for cases when | ||
| * certain event is dispatched repeatedly. A FastEvent instance should be created once for a given event type / qualifiers combination and then reused every | ||
| * time a given event is dispatched. | ||
| * </p> | ||
| * | ||
| * <p> | ||
| * FastEvent provides a subset of functionality provided by {@link Event} and these additional constraints apply to its usage: | ||
| * </p> | ||
| * | ||
| * <ul> | ||
| * <li>Event type and qualifiers must be known at FastEvent construction time. The actual type of the event object passed to the {@link #fire(Object)} method is | ||
| * not considered for observer method resolution.</li> | ||
| * <li>Events dispatched using FastEvent are always delivered immediately. If an observer method is transactional it will be notified immediately and not during | ||
| * the matching transaction phase.</li> | ||
| * <li>FastEvent is not serializable</li> | ||
| * </ul> | ||
| * | ||
| * <p> | ||
| * These constraints should always be carefully considered when deciding whether to use FastEvent or not. FastEvent is an internal construct and <strong>should | ||
| * not</strong> be used by an application. | ||
| * </p> | ||
| * | ||
| * @author Jozef Hartinger | ||
| * | ||
| * @param <T> event type | ||
| */ | ||
| public class FastEvent<T> { | ||
|
|
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| @SuppressWarnings("serial") | ||
| private static final Type EVENT_METADATA_INSTANCE_TYPE = new TypeLiteral<Instance<EventMetadata>>() { | ||
| }.getType(); | ||
|
|
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| /** | ||
| * Determines whether any of the resolved observer methods is either extension-provided or contains an injection point with {@link EventMetadata} type. | ||
| */ | ||
| private static boolean isMetadataRequired(Set<? extends ObserverMethod<?>> resolvedObserverMethods) { | ||
| for (ObserverMethod<?> observer : resolvedObserverMethods) { | ||
| if (observer instanceof ObserverMethodImpl<?, ?>) { | ||
| ObserverMethodImpl<?, ?> observerImpl = (ObserverMethodImpl<?, ?>) observer; | ||
| for (WeldInjectionPointAttributes<?, ?> ip : observerImpl.getInjectionPoints()) { | ||
| Type type = ip.getType(); | ||
| if (EventMetadata.class.equals(type) || EVENT_METADATA_INSTANCE_TYPE.equals(type)) { | ||
| return true; | ||
| } | ||
| } | ||
| } else { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
||
| /** | ||
| * Same as {@link #of(Class, BeanManagerImpl, Annotation...)}, just the accessible lenient observer notifier is used for observer method resolution | ||
| */ | ||
| public static <T> FastEvent<T> of(Class<T> type, BeanManagerImpl manager, Annotation... qualifiers) { | ||
| return of(type, manager, manager.getAccessibleLenientObserverNotifier(), qualifiers); | ||
| } | ||
|
|
||
| /** | ||
| * Constructs a new FastEvent instance | ||
| * @param type the event type | ||
| * @param manager the bean manager | ||
| * @param notifier the notifier to be used for observer method resolution | ||
| * @param qualifiers the event qualifiers | ||
| * @return | ||
| */ | ||
| public static <T> FastEvent<T> of(Class<T> type, BeanManagerImpl manager, ObserverNotifier notifier, Annotation... qualifiers) { | ||
| Set<ObserverMethod<? super T>> resolvedObserverMethods = notifier.<T> resolveObserverMethods(notifier.buildEventResolvable(type, qualifiers)); | ||
| if (isMetadataRequired(resolvedObserverMethods)) { | ||
| EventMetadata metadata = new EventMetadataImpl(type, qualifiers); | ||
| CurrentEventMetadata metadataService = manager.getServices().get(CurrentEventMetadata.class); | ||
| return new FastEventWithMetadataPropagation<T>(resolvedObserverMethods, metadata, metadataService); | ||
| } else { | ||
| return new FastEvent<T>(resolvedObserverMethods); | ||
| } | ||
| } | ||
|
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| private final Set<ObserverMethod<? super T>> resolvedObserverMethods; | ||
|
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| private FastEvent(Set<ObserverMethod<? super T>> resolvedObserverMethods) { | ||
| this.resolvedObserverMethods = resolvedObserverMethods; | ||
| } | ||
|
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| public void fire(T event) { | ||
| for (ObserverMethod<? super T> observer : resolvedObserverMethods) { | ||
| observer.notify(event); | ||
| } | ||
| } | ||
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| private static class FastEventWithMetadataPropagation<T> extends FastEvent<T> { | ||
|
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| private final EventMetadata metadata; | ||
| private final CurrentEventMetadata metadataService; | ||
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| private FastEventWithMetadataPropagation(Set<ObserverMethod<? super T>> resolvedObserverMethods, EventMetadata metadata, | ||
| CurrentEventMetadata metadataService) { | ||
| super(resolvedObserverMethods); | ||
| this.metadata = metadata; | ||
| this.metadataService = metadataService; | ||
| } | ||
|
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| @Override | ||
| public void fire(T event) { | ||
| if (metadata != null) { | ||
| metadataService.push(metadata); | ||
| } | ||
| try { | ||
| super.fire(event); | ||
| } finally { | ||
| if (metadata != null) { | ||
| metadataService.pop(); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
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| private static class EventMetadataImpl implements EventMetadata { | ||
|
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| private final Set<Annotation> qualifiers; | ||
| private final Type type; | ||
|
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| private EventMetadataImpl(Type type, Annotation... qualifiers) { | ||
| this.type = type; | ||
| this.qualifiers = ImmutableSet.copyOf(qualifiers); | ||
| } | ||
|
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| @Override | ||
| public Set<Annotation> getQualifiers() { | ||
| return qualifiers; | ||
| } | ||
|
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| @Override | ||
| public InjectionPoint getInjectionPoint() { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public Type getType() { | ||
| return type; | ||
| } | ||
| } | ||
| } |
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