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Java > Open Source Codes > org > jboss > util > deadlock > ApplicationDeadlockException


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.util.deadlock;
23
24 /**
25  * This exception class is thrown when application deadlock is detected when trying to lock an entity bean
26  * This is probably NOT a result of a jboss bug, but rather that the application is access the same entity
27  * beans within 2 different transaction in a different order. Remember, with a PessimisticEJBLock,
28  * Entity beans are locked until the transaction commits or is rolled back.
29  *
30  * @author <a HREF="bill@burkecentral.com">Bill Burke</a>
31  *
32  * @version $Revision: 1958 $
33  *
34  * <p><b>Revisions:</b><br>
35  * <p><b>2002/02/13: billb</b>
36  * <ol>
37  * <li>Initial revision
38  * </ol>
39  */
40 public class ApplicationDeadlockException extends RuntimeException JavaDoc
41 {
42    protected boolean retry = false;
43
44
45    public ApplicationDeadlockException()
46    {
47       super();
48    }
49
50    public ApplicationDeadlockException(String JavaDoc msg, boolean retry)
51    {
52       super(msg);
53       this.retry = retry;
54    }
55
56    public boolean retryable()
57    {
58       return retry;
59    }
60
61    
62    /**
63     * Detects exception contains is or a ApplicationDeadlockException.
64     */
65    public static ApplicationDeadlockException isADE(Throwable JavaDoc t)
66    {
67       while (t!=null)
68       {
69          if (t instanceof ApplicationDeadlockException)
70          {
71             return (ApplicationDeadlockException)t;
72          }
73          else
74          {
75             t = t.getCause();
76          }
77       }
78       return null;
79    }
80
81 }
82
83
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