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1   /***
2    * 
3    * Copyright 2005 LogicBlaze, Inc.
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.jencks;
19  
20  import org.apache.commons.logging.Log;
21  import org.apache.commons.logging.LogFactory;
22  
23  import javax.jms.Message;
24  import javax.jms.MessageListener;
25  import javax.resource.ResourceException;
26  import javax.resource.spi.LocalTransaction;
27  import javax.resource.spi.endpoint.MessageEndpoint;
28  import java.lang.reflect.Method;
29  
30  /***
31   * Performs a local transaction while processing the message
32   *
33   * @version $Revision: 1.1.1.1 $
34   */
35  public class LocalTransactionEndpoint implements MessageEndpoint, MessageListener {
36  
37      private static final Log log = LogFactory.getLog(LocalTransactionEndpoint.class);
38  
39      private MessageListener messageListener;
40      private LocalTransaction localTransaction;
41  
42      public LocalTransactionEndpoint(MessageListener messageListener, LocalTransaction localTransaction) {
43          this.messageListener = messageListener;
44          this.localTransaction = localTransaction;
45      }
46  
47      public void beforeDelivery(Method method) throws NoSuchMethodException, ResourceException {
48          getLocalTransaction().begin();
49      }
50  
51      public void afterDelivery() throws ResourceException {
52          getLocalTransaction().commit();
53      }
54  
55      public void release() {
56          if (localTransaction != null) {
57              try {
58                  localTransaction.rollback();
59              }
60              catch (ResourceException e) {
61                  log.warn("Failed to rollback local transaction: " + e, e);
62              }
63              localTransaction = null;
64          }
65      }
66  
67      public void onMessage(Message message) {
68          messageListener.onMessage(message);
69      }
70  
71  
72      /***
73       * A getter which will return the current local transaction or throw a new exception
74       * if this endpoint has already been released.
75       */
76      protected LocalTransaction getLocalTransaction() throws ResourceException {
77          if (localTransaction == null) {
78              throw new ResourceException("This endpoint has already been released via a call to release() you cannot deliver messages to me");
79          }
80          return localTransaction;
81      }
82  
83  }