XmlConfigHelper xref

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    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  }