JTransactionManager


1   /**
2    * EasyBeans
3    * Copyright (C) 2006 Bull S.A.S.
4    * Contact: easybeans@objectweb.org
5    *
6    * This library is free software; you can redistribute it and/or
7    * modify it under the terms of the GNU Lesser General Public
8    * License as published by the Free Software Foundation; either
9    * version 2.1 of the License, or any later version.
10   *
11   * This library is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   * Lesser General Public License for more details.
15   *
16   * You should have received a copy of the GNU Lesser General Public
17   * License along with this library; if not, write to the Free Software
18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
19   * USA
20   *
21   * --------------------------------------------------------------------------
22   * $Id: JTransactionManager.java 1022 2006-08-04 11:02:28Z benoitf $
23   * --------------------------------------------------------------------------
24   */
25  
26  package org.objectweb.easybeans.transaction;
27  
28  import javax.naming.InitialContext  ;
29  import javax.naming.NamingException  ;
30  import javax.transaction.TransactionManager  ;
31  
32  import org.objectweb.easybeans.component.itf.TMComponent;
33  
34  /**
35   * Allows to get a transaction manager.
36   * @author Florent Benoit
37   */
38  public final class JTransactionManager {
39  
40      /**
41       * Utility class, no public constructor.
42       */
43      private JTransactionManager() {
44  
45      }
46  
47      /**
48       * Internal tm.
49       */
50      private static TransactionManager   tm = null;
51  
52      /**
53       * Allow to get a transaction manager.
54       * @return a transaction manager.
55       */
56      public static TransactionManager   getTransactionManager() {
57          if (tm != null) {
58              return tm;
59          }
60  
61          // get it.
62          try {
63              tm = (TransactionManager  ) new InitialContext  ().lookup(TMComponent.JNDI_NAME);
64          } catch (NamingException   e) {
65              throw new IllegalStateException  ("Cannot get transaction manager", e);
66          }
67          return tm;
68      }
69  }
70
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