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Java > Open Source Codes > org > jboss > tm > TransactionDemarcationSupport


1 /*
2   * JBoss, Home of Professional Open Source
3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10   * the License, or (at your option) any later version.
11   *
12   * This software is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15   * Lesser General Public License for more details.
16   *
17   * You should have received a copy of the GNU Lesser General Public
18   * License along with this software; if not, write to the Free
19   * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20   * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21   */
22 package org.jboss.tm;
23
24 import javax.transaction.InvalidTransactionException JavaDoc;
25 import javax.transaction.SystemException JavaDoc;
26 import javax.transaction.Transaction JavaDoc;
27 import javax.transaction.TransactionManager JavaDoc;
28
29 import org.jboss.util.NestedRuntimeException;
30
31 /**
32  * A simple helper for transaction demarcation.
33  *
34  * @author <a HREF="adrian@jboss.com">Adrian Brock</a>
35  * @version $Revision: 37459 $
36  */
37 public class TransactionDemarcationSupport
38 {
39    private static final TransactionManagerLocator locator = TransactionManagerLocator.getInstance();
40    
41    /**
42     * Suspend any transaction associated with the thread
43     *
44     * @return any suspended transaction or null if there was no transaction
45     */
46    public static Transaction JavaDoc suspendAnyTransaction()
47    {
48       TransactionManager JavaDoc tm = locator.locate();
49       try
50       {
51          return tm.suspend();
52       }
53       catch (SystemException JavaDoc e)
54       {
55          throw new NestedRuntimeException("Unable to suspend transaction", e);
56       }
57    }
58    
59    /**
60     * Resume any transaction
61     *
62     * @param tx the transaction to resume
63     */
64    public static void resumeAnyTransaction(Transaction JavaDoc tx)
65    {
66       // Nothing to do
67 if (tx == null)
68          return;
69       
70       TransactionManager JavaDoc tm = locator.locate();
71       try
72       {
73          tm.resume(tx);
74       }
75       catch (InvalidTransactionException JavaDoc e)
76       {
77          throw new NestedRuntimeException("Unable to resume an invalid transaction", e);
78       }
79       catch (SystemException JavaDoc e)
80       {
81          throw new NestedRuntimeException("Unable to suspend transaction", e);
82       }
83    }
84 }
85
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