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 */
017 package org.apache.camel.spring;
018
019 import org.apache.camel.Endpoint;
020 import org.apache.camel.Processor;
021 import org.apache.camel.RuntimeCamelException;
022 import org.apache.camel.component.bean.BeanProcessor;
023 import org.apache.camel.component.event.EventComponent;
024 import org.apache.camel.component.event.EventEndpoint;
025 import org.apache.camel.impl.DefaultCamelContext;
026 import org.apache.camel.impl.ProcessorEndpoint;
027 import org.apache.camel.spi.Injector;
028 import org.apache.camel.spi.Registry;
029 import org.apache.camel.spring.spi.ApplicationContextRegistry;
030 import org.apache.camel.spring.spi.SpringInjector;
031 import org.apache.commons.logging.Log;
032 import org.apache.commons.logging.LogFactory;
033 import org.springframework.beans.BeansException;
034 import org.springframework.beans.factory.DisposableBean;
035 import org.springframework.beans.factory.InitializingBean;
036 import org.springframework.context.ApplicationContext;
037 import org.springframework.context.ApplicationContextAware;
038 import org.springframework.context.ApplicationEvent;
039 import org.springframework.context.ApplicationListener;
040 import org.springframework.context.ConfigurableApplicationContext;
041 import org.springframework.context.event.ContextRefreshedEvent;
042 import org.springframework.context.support.ClassPathXmlApplicationContext;
043
044 /**
045 * A Spring aware implementation of {@link org.apache.camel.CamelContext} which
046 * will automatically register itself with Springs lifecycle methods plus allows
047 * spring to be used to customize a any <a
048 * href="http://activemq.apache.org/camel/type-converter.html">Type Converters</a>
049 * as well as supporting accessing components and beans via the Spring
050 * {@link ApplicationContext}
051 *
052 * @version $Revision: 641676 $
053 */
054 public class SpringCamelContext extends DefaultCamelContext implements InitializingBean, DisposableBean,
055 ApplicationContextAware, ApplicationListener {
056 private static final transient Log LOG = LogFactory.getLog(SpringCamelContext.class);
057 private ApplicationContext applicationContext;
058 private EventEndpoint eventEndpoint;
059
060 public SpringCamelContext() {
061 }
062
063 public SpringCamelContext(ApplicationContext applicationContext) {
064 setApplicationContext(applicationContext);
065 }
066
067 public static SpringCamelContext springCamelContext(ApplicationContext applicationContext)
068 throws Exception {
069 // lets try and look up a configured camel context in the context
070 String[] names = applicationContext.getBeanNamesForType(SpringCamelContext.class);
071 if (names.length == 1) {
072 return (SpringCamelContext)applicationContext.getBean(names[0], SpringCamelContext.class);
073 }
074 SpringCamelContext answer = new SpringCamelContext();
075 answer.setApplicationContext(applicationContext);
076 answer.afterPropertiesSet();
077 return answer;
078 }
079
080 public static SpringCamelContext springCamelContext(String configLocations) throws Exception {
081 return springCamelContext(new ClassPathXmlApplicationContext(configLocations));
082 }
083
084 public void afterPropertiesSet() throws Exception {
085 start();
086 }
087
088 public void destroy() throws Exception {
089 stop();
090 }
091
092 public void onApplicationEvent(ApplicationEvent event) {
093 if (LOG.isDebugEnabled()) {
094 LOG.debug("Publishing event: " + event);
095 }
096
097 if (event instanceof ContextRefreshedEvent) {
098 // now lets start the CamelContext so that all its possible
099 // dependencies are initailized
100 try {
101 LOG.debug("Starting the CamelContext now that the ApplicationContext has started");
102 start();
103 } catch (RuntimeException e) {
104 throw e;
105 } catch (Exception e) {
106 throw new RuntimeCamelException(e);
107 }
108 if (eventEndpoint != null) {
109 eventEndpoint.onApplicationEvent(event);
110 }
111 } else {
112 if (eventEndpoint != null) {
113 eventEndpoint.onApplicationEvent(event);
114 } else {
115 LOG.warn("No eventEndpoint enabled for event: " + event);
116 }
117 }
118 }
119
120 // Properties
121 // -----------------------------------------------------------------------
122
123 public ApplicationContext getApplicationContext() {
124 return applicationContext;
125 }
126
127 public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
128 this.applicationContext = applicationContext;
129
130 if (applicationContext instanceof ConfigurableApplicationContext) {
131 addComponent("event", new EventComponent(applicationContext));
132 }
133 }
134
135 public EventEndpoint getEventEndpoint() {
136 return eventEndpoint;
137 }
138
139 public void setEventEndpoint(EventEndpoint eventEndpoint) {
140 this.eventEndpoint = eventEndpoint;
141 }
142
143 // Implementation methods
144 // -----------------------------------------------------------------------
145
146 @Override
147 protected void doStart() throws Exception {
148 super.doStart();
149 if (eventEndpoint == null) {
150 eventEndpoint = createEventEndpoint();
151 }
152 }
153
154 @Override
155 protected Injector createInjector() {
156 if (applicationContext instanceof ConfigurableApplicationContext) {
157 return new SpringInjector((ConfigurableApplicationContext)applicationContext);
158 } else {
159 LOG.warn("Cannot use SpringInjector as applicationContext is not a ConfigurableApplicationContext as its: "
160 + applicationContext);
161 return super.createInjector();
162 }
163 }
164
165 protected EventEndpoint createEventEndpoint() {
166 EventEndpoint endpoint = getEndpoint("event:default", EventEndpoint.class);
167 return endpoint;
168 }
169
170 protected Endpoint convertBeanToEndpoint(String uri, Object bean) {
171 Processor processor = new BeanProcessor(bean, this);
172 return new ProcessorEndpoint(uri, this, processor);
173 }
174
175 @Override
176 protected Registry createRegistry() {
177 return new ApplicationContextRegistry(getApplicationContext());
178 }
179 }