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 java.util.HashMap;
020 import java.util.LinkedList;
021 import java.util.Map;
022 import java.util.Set;
023 import javax.xml.bind.JAXBException;
024
025 import org.apache.camel.CamelContext;
026 import org.apache.camel.ProducerTemplate;
027 import org.apache.camel.spring.handler.CamelNamespaceHandler;
028 import org.apache.camel.util.MainSupport;
029 import org.apache.camel.view.ModelFileGenerator;
030 import org.apache.commons.logging.Log;
031 import org.apache.commons.logging.LogFactory;
032 import org.springframework.context.ApplicationContext;
033 import org.springframework.context.support.AbstractApplicationContext;
034 import org.springframework.context.support.ClassPathXmlApplicationContext;
035 import org.springframework.context.support.FileSystemXmlApplicationContext;
036
037 /**
038 * A command line tool for booting up a CamelContext using an optional Spring
039 * ApplicationContext
040 *
041 * @version $Revision: 735424 $
042 */
043 public class Main extends MainSupport {
044 private static Main instance;
045
046 private String applicationContextUri = "META-INF/spring/*.xml";
047 private String fileApplicationContextUri;
048 private AbstractApplicationContext applicationContext;
049 private AbstractApplicationContext parentApplicationContext;
050 private String parentApplicationContextUri;
051
052 public Main() {
053
054 addOption(new ParameterOption("ac", "applicationContext",
055 "Sets the classpath based spring ApplicationContext", "applicationContext") {
056 protected void doProcess(String arg, String parameter, LinkedList<String> remainingArgs) {
057 setApplicationContextUri(parameter);
058 }
059 });
060
061 addOption(new ParameterOption("fa", "fileApplicationContext",
062 "Sets the filesystem based spring ApplicationContext", "fileApplicationContext") {
063 protected void doProcess(String arg, String parameter, LinkedList<String> remainingArgs) {
064 setFileApplicationContextUri(parameter);
065 }
066 });
067
068 }
069
070 /**
071 * A class for intercepting the hang up signal and do a graceful shutdown of
072 * the Camel.
073 */
074 private class HangupInterceptor extends Thread {
075 Log log = LogFactory.getLog(this.getClass());
076 Main mainInstance;
077
078 public HangupInterceptor(Main main) {
079 mainInstance = main;
080 }
081
082 @Override
083 public void run() {
084 log.info("Recieved hang up - stopping the main instance.");
085 try {
086 mainInstance.stop();
087 } catch (Exception ex) {
088 log.warn(ex);
089 }
090 }
091 }
092
093
094 public static void main(String... args) {
095 Main main = new Main();
096 instance = main;
097 main.enableHangupSupport();
098 main.run(args);
099 }
100
101 /**
102 * Returns the currently executing main
103 *
104 * @return the current running instance
105 */
106 public static Main getInstance() {
107 return instance;
108 }
109
110 /**
111 * Enables the hangup support. Gracefully stops by calling stop() on a
112 * Hangup signal.
113 */
114 public void enableHangupSupport() {
115 HangupInterceptor interceptor = new HangupInterceptor(this);
116 Runtime.getRuntime().addShutdownHook(interceptor);
117 }
118
119 @Override
120 public void enableDebug() {
121 super.enableDebug();
122 setParentApplicationContextUri("/META-INF/services/org/apache/camel/spring/debug.xml");
123 }
124
125 @Override
126 public void enableTrace() {
127 super.enableTrace();
128 setParentApplicationContextUri("/META-INF/services/org/apache/camel/spring/trace.xml");
129 }
130
131 // Properties
132 // -------------------------------------------------------------------------
133 public AbstractApplicationContext getApplicationContext() {
134 return applicationContext;
135 }
136
137 public void setApplicationContext(AbstractApplicationContext applicationContext) {
138 this.applicationContext = applicationContext;
139 }
140
141 public String getApplicationContextUri() {
142 return applicationContextUri;
143 }
144
145 public void setApplicationContextUri(String applicationContextUri) {
146 this.applicationContextUri = applicationContextUri;
147 }
148
149 public String getFileApplicationContextUri() {
150 return fileApplicationContextUri;
151 }
152
153 public void setFileApplicationContextUri(String fileApplicationContextUri) {
154 this.fileApplicationContextUri = fileApplicationContextUri;
155 }
156
157 public AbstractApplicationContext getParentApplicationContext() {
158 if (parentApplicationContext == null) {
159 if (parentApplicationContextUri != null) {
160 parentApplicationContext = new ClassPathXmlApplicationContext(parentApplicationContextUri);
161 parentApplicationContext.start();
162 }
163 }
164 return parentApplicationContext;
165 }
166
167 public void setParentApplicationContext(AbstractApplicationContext parentApplicationContext) {
168 this.parentApplicationContext = parentApplicationContext;
169 }
170
171 public String getParentApplicationContextUri() {
172 return parentApplicationContextUri;
173 }
174
175 public void setParentApplicationContextUri(String parentApplicationContextUri) {
176 this.parentApplicationContextUri = parentApplicationContextUri;
177 }
178
179 // Implementation methods
180 // -------------------------------------------------------------------------
181
182 @Override
183 protected void doStart() throws Exception {
184 super.doStart();
185 if (applicationContext == null) {
186 applicationContext = createDefaultApplicationContext();
187 }
188 LOG.debug("Starting Spring ApplicationContext: " + applicationContext.getId());
189 applicationContext.start();
190
191 postProcessContext();
192 }
193
194 protected void doStop() throws Exception {
195 super.doStop();
196 if (applicationContext != null) {
197 LOG.debug("Stopping Spring ApplicationContext: " + applicationContext.getId());
198 applicationContext.close();
199 }
200 }
201
202 protected ProducerTemplate findOrCreateCamelTemplate() {
203 String[] names = getApplicationContext().getBeanNamesForType(ProducerTemplate.class);
204 if (names != null && names.length > 0) {
205 return (ProducerTemplate) getApplicationContext().getBean(names[0], ProducerTemplate.class);
206 }
207 for (CamelContext camelContext : getCamelContexts()) {
208 return camelContext.createProducerTemplate();
209 }
210 throw new IllegalArgumentException("No CamelContexts are available so cannot create a ProducerTemplate!");
211 }
212
213 protected AbstractApplicationContext createDefaultApplicationContext() {
214 // file based
215 if (getFileApplicationContextUri() != null) {
216 String[] args = getFileApplicationContextUri().split(";");
217
218 ApplicationContext parentContext = getParentApplicationContext();
219 if (parentContext != null) {
220 return new FileSystemXmlApplicationContext(args, parentContext);
221 } else {
222 return new FileSystemXmlApplicationContext(args);
223 }
224 }
225
226 // default to classpath based
227 String[] args = getApplicationContextUri().split(";");
228 ApplicationContext parentContext = getParentApplicationContext();
229 if (parentContext != null) {
230 return new ClassPathXmlApplicationContext(args, parentContext);
231 } else {
232 return new ClassPathXmlApplicationContext(args);
233 }
234 }
235
236 protected Map<String, CamelContext> getCamelContextMap() {
237 Map<String, SpringCamelContext> map = applicationContext.getBeansOfType(SpringCamelContext.class);
238 Set<Map.Entry<String, SpringCamelContext>> entries = map.entrySet();
239 Map<String, CamelContext> answer = new HashMap<String, CamelContext>();
240 for (Map.Entry<String, SpringCamelContext> entry : entries) {
241 String name = entry.getKey();
242 CamelContext camelContext = entry.getValue();
243 answer.put(name, camelContext);
244 }
245 return answer;
246 }
247
248 protected ModelFileGenerator createModelFileGenerator() throws JAXBException {
249 return new ModelFileGenerator(new CamelNamespaceHandler().getJaxbContext());
250 }
251 }