KickJava   Java API By Example, From Geeks To Geeks.

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


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.naming.Context JavaDoc;
25 import javax.naming.InitialContext JavaDoc;
26 import javax.naming.NamingException JavaDoc;
27 import javax.transaction.Transaction JavaDoc;
28 import javax.transaction.TransactionManager JavaDoc;
29
30 import org.jboss.logging.Logger;
31
32 /**
33  * Transaction Manager utility methods.
34  *
35  * @author <a HREF="mailto:reverbel@ime.usp.br">Francisco Reverbel</a>
36  * @version $Revision: 37459 $
37  */
38 public class TMUtil
39 {
40    
41    private static final Logger log =
42       Logger.getLogger(TMUtil.class);
43
44    private static TransactionManager JavaDoc tm;
45    
46    // enforce non-instantiability
47 private TMUtil()
48    {
49    }
50    
51    /**
52     * Gets a <code>Transaction</code> instance given its <code>LocalId</code>.
53     */
54    public static Transaction JavaDoc getTransaction(LocalId localId)
55    {
56       TransactionPropagationContextImporter tpcImporter =
57          TransactionPropagationContextUtil.getTPCImporter();
58       
59       return tpcImporter.importTransactionPropagationContext(localId);
60    }
61
62    /**
63     * Gets a reference to the transaction manager.
64     */
65    public static TransactionManager JavaDoc getTransactionManager()
66    {
67       if (tm == null)
68       {
69          try
70          {
71             Context JavaDoc ctx = new InitialContext JavaDoc();
72             tm = (TransactionManager JavaDoc)ctx.lookup("java:/TransactionManager");
73          }
74          catch (NamingException JavaDoc ex)
75          {
76             log.error("java:/TransactionManager lookup failed", ex);
77          }
78       }
79       return tm;
80    }
81    
82    /**
83     * Time-out conversion from milliseconds to seconds.
84     */
85    public static int divideAndRoundUp(long m, long n)
86    {
87       long retval = m / n;
88
89       if ((m % n) != 0)
90          retval = retval + 1;
91       return (int)retval ;
92    }
93
94 }
95
Popular Tags