001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.camel.component.event; 018 019import java.util.LinkedHashSet; 020import java.util.Map; 021import java.util.Set; 022 023import org.apache.camel.impl.UriEndpointComponent; 024import org.slf4j.Logger; 025import org.slf4j.LoggerFactory; 026import org.springframework.beans.BeansException; 027import org.springframework.context.ApplicationContext; 028import org.springframework.context.ApplicationContextAware; 029import org.springframework.context.ApplicationEvent; 030import org.springframework.context.ConfigurableApplicationContext; 031 032/** 033 * The <a href="http://camel.apache.org/event.html">Event Component</a> is for working with Spring ApplicationEvents. 034 * 035 * @version 036 */ 037public class EventComponent extends UriEndpointComponent implements ApplicationContextAware { 038 private static final Logger LOG = LoggerFactory.getLogger(EventComponent.class); 039 private ApplicationContext applicationContext; 040 private final Set<EventEndpoint> endpoints = new LinkedHashSet<EventEndpoint>(); 041 042 public EventComponent() { 043 super(EventEndpoint.class); 044 } 045 046 public EventComponent(ApplicationContext applicationContext) { 047 super(EventEndpoint.class); 048 setApplicationContext(applicationContext); 049 } 050 051 public ApplicationContext getApplicationContext() { 052 return applicationContext; 053 } 054 055 /** 056 * The Spring ApplicationContext 057 */ 058 public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { 059 this.applicationContext = applicationContext; 060 } 061 062 public ConfigurableApplicationContext getConfigurableApplicationContext() { 063 ApplicationContext applicationContext = getApplicationContext(); 064 if (applicationContext instanceof ConfigurableApplicationContext) { 065 return (ConfigurableApplicationContext)applicationContext; 066 } else { 067 throw new IllegalArgumentException("Class: " + applicationContext.getClass().getName() + " is not an instanceof ConfigurableApplicationContext."); 068 } 069 } 070 071 protected EventEndpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception { 072 EventEndpoint answer = new EventEndpoint(uri, this, remaining); 073 setProperties(answer, parameters); 074 return answer; 075 } 076 077 protected void consumerStarted(EventEndpoint endpoint) { 078 endpoints.add(endpoint); 079 } 080 081 protected void consumerStopped(EventEndpoint endpoint) { 082 endpoints.remove(endpoint); 083 } 084 085 public void onApplicationEvent(ApplicationEvent event) { 086 // broadcast to the endpoints in use 087 for (EventEndpoint endpoint : endpoints) { 088 try { 089 endpoint.onApplicationEvent(event); 090 } catch (Exception e) { 091 LOG.warn("Error on application event " + event + ". This exception will be ignored.", e); 092 } 093 } 094 } 095 096 @Override 097 protected void doStop() throws Exception { 098 endpoints.clear(); 099 super.doStop(); 100 } 101}