001 /**
002 *
003 * Copyright 2004 Protique Ltd
004 *
005 * Licensed under the Apache License, Version 2.0 (the "License");
006 * you may not use this file except in compliance with the License.
007 * 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 **/
018 package org.activemq;
019
020 import org.activemq.broker.BrokerContainerFactory;
021 import org.activemq.util.JMSExceptionHelper;
022
023 import javax.jms.JMSException;
024 import java.lang.reflect.Method;
025
026 /**
027 * Helper methods to avoid a runtime dependency on Spring unless its
028 * used to configure the ActiveMQ broker via the XML configuration
029 *
030 * @version $Revision: 1.1.1.1 $
031 */
032 public class XmlConfigHelper {
033 private static final Class[] ARGUMENT_TYPES = {String.class};
034 public static final String SPRING_CLASS_NAME = "org.activemq.spring.SpringBrokerContainerFactory";
035
036 /**
037 * Creates an instance of the broker factory which uses the Spring XML configuration file
038 * mechanism.
039 */
040 public static BrokerContainerFactory createBrokerContainerFactory(String xmlConfig) throws JMSException {
041 try {
042 Class factoryClass = getSpringFactoryClass();
043 Method method = factoryClass.getMethod("newFactory", ARGUMENT_TYPES);
044 if (method == null) {
045 throw new JMSException("Could not find newFactory() method - classpath strangeness occurred");
046 }
047 return (BrokerContainerFactory) method.invoke(null, new Object[]{xmlConfig});
048 }
049 catch (JMSException e) {
050 throw e;
051 }
052 catch (ClassNotFoundException e) {
053 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);
054 }
055 catch (Exception e) {
056 throw JMSExceptionHelper.newJMSException("Could not configure broker using XML configuration file as attempt to use Spring factory failed. Reason: " + e, e);
057 }
058 }
059
060 private static Class getSpringFactoryClass() throws ClassNotFoundException {
061 Class answer = null;
062 try {
063 answer = Thread.currentThread().getContextClassLoader().loadClass(SPRING_CLASS_NAME);
064 }
065 catch (ClassNotFoundException e) {
066 answer = XmlConfigHelper.class.getClassLoader().loadClass(SPRING_CLASS_NAME);
067 }
068 return answer;
069 }
070 }