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Java > Open Source Codes > org > jboss > aspects > tx > TxPropagationInterceptor


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.aspects.tx;
23
24 import javax.transaction.Transaction JavaDoc;
25 import javax.transaction.TransactionManager JavaDoc;
26 import org.jboss.aop.advice.Interceptor;
27 import org.jboss.aop.joinpoint.Invocation;
28 import org.jboss.tm.TransactionManagerLocator;
29 import org.jboss.tm.TransactionPropagationContextUtil;
30
31 /**
32  * Comment
33  *
34  * @author <a HREF="mailto:bill@jboss.org">Bill Burke</a>
35  * @version $Revision: 43966 $
36  */
37 public class TxPropagationInterceptor implements Interceptor
38 {
39    private TransactionManager JavaDoc tm;
40
41    public TxPropagationInterceptor(TransactionManager JavaDoc tm)
42    {
43       this.tm = tm;
44    }
45
46    public TxPropagationInterceptor()
47    {
48       tm = TransactionManagerLocator.getInstance().locate();
49    }
50
51    public String JavaDoc getName()
52    {
53       return "TxPropagationInterceptor";
54    }
55
56    public Object JavaDoc invoke(Invocation invocation) throws Throwable JavaDoc
57    {
58       Object JavaDoc tpc = invocation.getMetaData(ClientTxPropagationInterceptor.TRANSACTION_PROPAGATION_CONTEXT, ClientTxPropagationInterceptor.TRANSACTION_PROPAGATION_CONTEXT);
59       if (tpc != null)
60       {
61          Transaction JavaDoc tx = tm.getTransaction();
62          if (tx != null) throw new RuntimeException JavaDoc("cannot import a transaction context when a transaction is already associated with the thread");
63          Transaction JavaDoc importedTx = TransactionPropagationContextUtil.getTPCImporter().importTransactionPropagationContext(tpc);
64          tm.resume(importedTx);
65          try
66          {
67             return invocation.invokeNext();
68          }
69          finally
70          {
71             tm.suspend();
72          }
73       }
74       else
75       {
76          return invocation.invokeNext();
77       }
78    }
79 }
80
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