1 /***
2 *
3 * Copyright 2004 Protique Ltd
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 **/
18 package org.codehaus.activemq;
19
20 import org.codehaus.activemq.broker.BrokerContainerFactory;
21 import org.codehaus.activemq.util.JMSExceptionHelper;
22
23 import javax.jms.JMSException;
24 import java.lang.reflect.Method;
25
26 /***
27 * Helper methods to avoid a runtime dependency on Spring unless its
28 * used to configure the ActiveMQ broker via the XML configuration
29 *
30 * @version $Revision: 1.1 $
31 */
32 public class XmlConfigHelper {
33 private static final Class[] ARGUMENT_TYPES = {String.class};
34 public static final String SPRING_CLASS_NAME = "org.codehaus.activemq.spring.SpringBrokerContainerFactory";
35
36 /***
37 * Creates an instance of the broker factory which uses the Spring XML configuration file
38 * mechanism.
39 */
40 public static BrokerContainerFactory createBrokerContainerFactory(String xmlConfig) throws JMSException {
41 try {
42 Class factoryClass = getSpringFactoryClass();
43 Method method = factoryClass.getMethod("newFactory", ARGUMENT_TYPES);
44 if (method == null) {
45 throw new JMSException("Could not find newFactory() method - classpath strangeness occurred");
46 }
47 return (BrokerContainerFactory) method.invoke(null, new Object[]{xmlConfig});
48 }
49 catch (JMSException e) {
50 throw e;
51 }
52 catch (ClassNotFoundException e) {
53 throw JMSExceptionHelper.newJMSException("Could not configure broker using XML configuration file as Spring factory class could not be loaded. Maybe you need the Spring.jar on your classpath? Reason: " + e, e);
54 }
55 catch (Exception e) {
56 throw JMSExceptionHelper.newJMSException("Could not configure broker using XML configuration file as attempt to use Spring factory failed. Reason: " + e, e);
57 }
58 }
59
60 private static Class getSpringFactoryClass() throws ClassNotFoundException {
61 Class answer = null;
62 try {
63 answer = Thread.currentThread().getContextClassLoader().loadClass(SPRING_CLASS_NAME);
64 }
65 catch (ClassNotFoundException e) {
66 answer = XmlConfigHelper.class.getClassLoader().loadClass(SPRING_CLASS_NAME);
67 }
68 return answer;
69 }
70 }