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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.util;
19  
20  import org.codehaus.activemq.store.PersistenceAdapter;
21  
22  import javax.jms.JMSException;
23  
24  /***
25   * A helper class for running code with a PersistenceAdapter
26   * in a transaction.
27   *
28   * @version $Revision: 1.2 $
29   */
30  public class TransactionTemplate {
31      private PersistenceAdapter persistenceAdapter;
32  
33      public TransactionTemplate(PersistenceAdapter persistenceAdapter) {
34          this.persistenceAdapter = persistenceAdapter;
35      }
36  
37      public void run(Callback task) throws JMSException {
38          persistenceAdapter.beginTransaction();
39          Throwable throwable = null;
40          try {
41              task.execute();
42          }
43          catch (Throwable t) {
44              throwable = t;
45          }
46          if (throwable == null) {
47              persistenceAdapter.commitTransaction();
48          }
49          else {
50              persistenceAdapter.rollbackTransaction();
51          }
52      }
53  }