/*
* Copyright 2002-2009 the original author or authors.
*
* 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.springframework.integration.event;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.integration.endpoint.MessageProducerSupport;
import org.springframework.integration.message.MessageBuilder;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* An inbound Channel Adapter that passes Spring
* {@link ApplicationEvent ApplicationEvents} within messages.
*
* @author Mark Fisher
*/
public class ApplicationEventInboundChannelAdapter extends MessageProducerSupport implements ApplicationListener {
private final List<Class<? extends ApplicationEvent>> eventTypes = new CopyOnWriteArrayList<Class<? extends ApplicationEvent>>();
/**
* Set the list of event types (classes that extend ApplicationEvent) that
* this adapter should send to the message channel. By default, all event
* types will be sent.
*/
public void setEventTypes(List<Class<? extends ApplicationEvent>> eventTypes) {
Assert.notEmpty(eventTypes, "at least one event type is required");
synchronized (this.eventTypes) {
this.eventTypes.clear();
this.eventTypes.addAll(eventTypes);
}
}
public void onApplicationEvent(ApplicationEvent event) {
if (CollectionUtils.isEmpty(this.eventTypes)) {
this.sendEventAsMessage(event);
return;
}
for (Class<? extends ApplicationEvent> eventType : this.eventTypes) {
if (eventType.isAssignableFrom(event.getClass())) {
this.sendEventAsMessage(event);
return;
}
}
}
private boolean sendEventAsMessage(ApplicationEvent event) {
return this.sendMessage(MessageBuilder.withPayload(event).build());
}
@Override
protected void doStart() {
}
@Override
protected void doStop() {
}
}
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