/*
* JBoss, Home of Professional Open Source
* Copyright 2012, 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.util.ArrayList;
import java.util.List;
import javax.enterprise.event.TransactionPhase;
import javax.enterprise.inject.spi.ObserverMethod;
import org.jboss.weld.bootstrap.api.ServiceRegistry;
import org.jboss.weld.resolution.TypeSafeObserverResolver;
import org.jboss.weld.transaction.spi.TransactionServices;
/**
* {@link ObserverNotifier} with support for transactional observer methods.
*
* @author Jozef Hartinger
*/
public class TransactionalObserverNotifier extends ObserverNotifier {
private final TransactionServices transactionServices;
private final String contextId;
protected TransactionalObserverNotifier(String contextId, TypeSafeObserverResolver resolver, ServiceRegistry services, boolean strict) {
super(resolver, services, strict);
this.contextId = contextId;
this.transactionServices = services.get(TransactionServices.class);
}
@Override
public <T> void notifyObservers(EventPacket<T> eventPacket, List<ObserverMethod<? super T>> observers) {
if(transactionServices == null || !transactionServices.isTransactionActive()) {
// Transaction is not active - no deferred notifications
super.notifyObservers(eventPacket, observers);
} else {
List<DeferredEventNotification<?>> notifications = new ArrayList<DeferredEventNotification<?>>();
currentEventMetadata.push(eventPacket);
try {
for (ObserverMethod<? super T> observer : observers) {
if(TransactionPhase.IN_PROGRESS.equals(observer.getTransactionPhase())) {
super.notifyObserver(eventPacket, observer);
} else {
deferNotification(eventPacket, observer, notifications);
}
}
} finally {
currentEventMetadata.pop();
}
if (!notifications.isEmpty()) {
transactionServices.registerSynchronization(new TransactionNotificationSynchronization(notifications));
}
}
}
/**
* Defers an event for processing in a later phase of the current
* transaction.
*
* @param eventPacket The event object
*/
private <T> void deferNotification(final EventPacket<T> packet, final ObserverMethod<? super T> observer, final List<DeferredEventNotification<?>> notifications) {
TransactionPhase transactionPhase = observer.getTransactionPhase();
boolean before = transactionPhase.equals(TransactionPhase.BEFORE_COMPLETION);
Status status = Status.valueOf(transactionPhase);
notifications.add(new DeferredEventNotification<T>(contextId, packet, observer, currentEventMetadata, status, before));
}
}