org.jboss.weld.event.DeferredEventNotification Maven / Gradle / Ivy
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* Copyright 2008, 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 javax.enterprise.inject.spi.ObserverMethod;
import org.jboss.weld.Container;
import org.jboss.weld.context.RequestContext;
import org.jboss.weld.context.unbound.UnboundLiteral;
import org.jboss.weld.logging.EventLogger;
/**
* A task that will notify the observer of a specific event at some future time.
*
* @author David Allen
* @author Jozef Hartinger
*/
public class DeferredEventNotification implements Runnable {
// The observer
protected final ObserverMethod observer;
// The event object
protected final EventPacket eventPacket;
private final CurrentEventMetadata currentEventMetadata;
private final String contextId;
/**
* Creates a new deferred event notifier.
*
* @param observer The observer to be notified
* @param eventPacket The event being fired
*/
public DeferredEventNotification(String contextId, EventPacket eventPacket, ObserverMethod observer, CurrentEventMetadata currentEventMetadata) {
this.contextId = contextId;
this.observer = observer;
this.eventPacket = eventPacket;
this.currentEventMetadata = currentEventMetadata;
}
public void run() {
try {
EventLogger.LOG.asyncFire(eventPacket, observer);
new RunInRequest(contextId) {
@Override
protected void execute() {
currentEventMetadata.push(eventPacket);
try {
observer.notify(eventPacket.getPayload());
} finally {
currentEventMetadata.pop();
}
}
}.run();
} catch (Exception e) {
EventLogger.LOG.asyncObserverFailure(eventPacket);
EventLogger.LOG.catchingDebug(e);
}
}
@Override
public String toString() {
return "Deferred event [" + eventPacket.getPayload() + "] for [" + observer + "]";
}
private abstract static class RunInRequest {
private final String contextId;
public RunInRequest(String contextId) {
this.contextId = contextId;
}
protected abstract void execute();
public void run() {
if (isRequestContextActive()) {
execute();
} else {
RequestContext requestContext = Container.instance(contextId).deploymentManager().instance().select(RequestContext.class, UnboundLiteral.INSTANCE).get();
try {
requestContext.activate();
execute();
} finally {
requestContext.invalidate();
requestContext.deactivate();
}
}
}
private boolean isRequestContextActive() {
for (RequestContext requestContext : Container.instance(contextId).deploymentManager().instance().select(RequestContext.class)) {
if (requestContext.isActive()) {
return true;
}
}
return false;
}
}
}