/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.camel.component.event;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.impl.DefaultEndpoint;
import org.apache.camel.impl.DefaultProducer;
import org.apache.camel.processor.loadbalancer.LoadBalancer;
import org.apache.camel.processor.loadbalancer.TopicLoadBalancer;
import org.apache.camel.spi.UriEndpoint;
import org.apache.camel.util.ObjectHelper;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.ApplicationEvent;
import static org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException;
/**
* An <a href="http://camel.apache.org/event.html">Event Endpoint</a>
* for working with Spring ApplicationEvents
*
* @version
*/
@UriEndpoint(scheme = "spring-event", consumerClass = EventConsumer.class)
public class EventEndpoint extends DefaultEndpoint implements ApplicationContextAware {
private LoadBalancer loadBalancer;
private ApplicationContext applicationContext;
public EventEndpoint(String endpointUri, EventComponent component) {
super(endpointUri, component);
this.applicationContext = component.getApplicationContext();
}
/**
* <b>Note:</b> It is preferred to create endpoints using the associated
* component.
* @deprecated
*/
@Deprecated
public EventEndpoint(String endpointUri) {
super(endpointUri);
}
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
this.applicationContext = applicationContext;
}
public ApplicationContext getApplicationContext() {
return applicationContext;
}
public boolean isSingleton() {
return true;
}
public Producer createProducer() throws Exception {
ObjectHelper.notNull(applicationContext, "applicationContext");
return new DefaultProducer(this) {
public void process(Exchange exchange) throws Exception {
ApplicationEvent event = toApplicationEvent(exchange);
applicationContext.publishEvent(event);
}
};
}
public EventConsumer createConsumer(Processor processor) throws Exception {
ObjectHelper.notNull(applicationContext, "applicationContext");
EventConsumer answer = new EventConsumer(this, processor);
configureConsumer(answer);
return answer;
}
public void onApplicationEvent(ApplicationEvent event) {
Exchange exchange = createExchange();
exchange.getIn().setBody(event);
try {
getLoadBalancer().process(exchange);
} catch (Exception e) {
throw wrapRuntimeCamelException(e);
}
}
public LoadBalancer getLoadBalancer() {
if (loadBalancer == null) {
loadBalancer = createLoadBalancer();
}
return loadBalancer;
}
public void setLoadBalancer(LoadBalancer loadBalancer) {
this.loadBalancer = loadBalancer;
}
@Override
public EventComponent getComponent() {
return (EventComponent) super.getComponent();
}
// Implementation methods
// -------------------------------------------------------------------------
public synchronized void consumerStarted(EventConsumer consumer) {
getComponent().consumerStarted(this);
getLoadBalancer().addProcessor(consumer.getProcessor());
}
public synchronized void consumerStopped(EventConsumer consumer) {
getComponent().consumerStopped(this);
getLoadBalancer().removeProcessor(consumer.getProcessor());
}
protected LoadBalancer createLoadBalancer() {
return new TopicLoadBalancer();
}
protected ApplicationEvent toApplicationEvent(Exchange exchange) {
ApplicationEvent event = exchange.getIn().getBody(ApplicationEvent.class);
if (event != null) {
return event;
}
return new CamelEvent(this, exchange);
}
}