/
DeferredEventNotification.java
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/
DeferredEventNotification.java
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/*
* JBoss, Home of Professional Open Source
* 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.module.jta;
import jakarta.enterprise.context.RequestScoped;
import jakarta.enterprise.inject.spi.EventMetadata;
import jakarta.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.event.CurrentEventMetadata;
import org.jboss.weld.injection.ThreadLocalStack.ThreadLocalStackReference;
import org.jboss.weld.logging.EventLogger;
import org.jboss.weld.util.Observers;
/**
* A task that will notify the observer of a specific event at some future time.
*
* @author David Allen
* @author Jozef Hartinger
*/
class DeferredEventNotification<T> implements Runnable {
// The observer
protected final ObserverMethod<? super T> observer;
// The event object
private final T event;
protected final EventMetadata metadata;
private final CurrentEventMetadata currentEventMetadata;
private final String contextId;
private final Status status;
private final boolean before;
/**
* Creates a new deferred event notifier.
*
* @param observer The observer to be notified
* @param metadata The event being fired
*/
public DeferredEventNotification(String contextId, T event, EventMetadata metadata, ObserverMethod<? super T> observer,
CurrentEventMetadata currentEventMetadata, Status status, boolean before) {
this.contextId = contextId;
this.observer = observer;
this.event = event;
this.metadata = metadata;
this.currentEventMetadata = currentEventMetadata;
this.status = status;
this.before = before;
}
public void run() {
try {
EventLogger.LOG.asyncFire(metadata, observer);
new RunInRequest(contextId) {
@Override
protected void execute() {
final ThreadLocalStackReference<EventMetadata> stack = currentEventMetadata.pushIfNotNull(metadata);
try {
Observers.notify(observer, event, metadata);
} finally {
stack.pop();
}
}
}.run();
} catch (Exception e) {
EventLogger.LOG.asyncObserverFailure(observer, metadata, e.getCause() != null ? e.getCause() : e);
EventLogger.LOG.catchingDebug(e);
}
}
public Status getStatus() {
return status;
}
public boolean isBefore() {
return before;
}
@Override
public String toString() {
return "Deferred event [" + event + "] 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() {
return Container.instance(contextId).deploymentManager().isContextActive(RequestScoped.class);
}
}
}