| /** |
| * 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.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 |
| */ |
| 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(); |
| } |
| |
| 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"); |
| return new EventConsumer(this, processor); |
| } |
| |
| 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; |
| } |
| |
| // Implementation methods |
| // ------------------------------------------------------------------------- |
| public synchronized void consumerStarted(EventConsumer consumer) { |
| getLoadBalancer().addProcessor(consumer.getProcessor()); |
| } |
| |
| public synchronized void consumerStopped(EventConsumer consumer) { |
| 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); |
| } |
| } |