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 org.jboss.weld.Container;
import org.jboss.weld.context.RequestContext;
import org.jboss.weld.context.unbound.UnboundLiteral;
import org.slf4j.cal10n.LocLogger;
import org.slf4j.ext.XLogger;
import org.slf4j.ext.XLogger.Level;
import static org.jboss.weld.logging.Category.EVENT;
import static org.jboss.weld.logging.LoggerFactory.loggerFactory;
import static org.jboss.weld.logging.messages.EventMessage.ASYNC_FIRE;
import static org.jboss.weld.logging.messages.EventMessage.ASYNC_OBSERVER_FAILURE;
/**
* A task that will notify the observer of a specific event at some future time.
*
* @author David Allen
*/
public class DeferredEventNotification implements Runnable {
private static final LocLogger log = loggerFactory().getLogger(EVENT);
private static final XLogger xLog = loggerFactory().getXLogger(EVENT);
// The observer
protected final ObserverMethodImpl observer;
// The event object
protected final T event;
/**
* Creates a new deferred event notifier.
*
* @param observer The observer to be notified
* @param event The event being fired
*/
public DeferredEventNotification(T event, ObserverMethodImpl observer) {
this.observer = observer;
this.event = event;
}
public void run() {
try {
log.debug(ASYNC_FIRE, event, observer);
new RunInRequest() {
@Override
protected void execute() {
observer.sendEvent(event);
}
}.run();
} catch (Exception e) {
log.error(ASYNC_OBSERVER_FAILURE, event);
xLog.throwing(Level.DEBUG, e);
}
}
@Override
public String toString() {
return "Deferred event [" + event + "] for [" + observer + "]";
}
private abstract static class RunInRequest {
protected abstract void execute();
public void run() {
if (isRequestContextActive()) {
execute();
} else {
RequestContext requestContext = Container.instance().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().deploymentManager().instance().select(RequestContext.class)) {
if (requestContext.isActive()) {
return true;
}
}
return false;
}
}
}