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Java > Open Source Codes > org > objectweb > cjdbc > controller > virtualdatabase > protocol > UnlogRollback


1 /**
2  * C-JDBC: Clustered JDBC.
3  * Copyright (C) 2005 Emic Networks.
4  * Contact: c-jdbc@objectweb.org
5  *
6  * This library is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU Lesser General Public License as published by the
8  * Free Software Foundation; either version 2.1 of the License, or any later
9  * version.
10  *
11  * This library is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
14  * for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public License
17  * along with this library; if not, write to the Free Software Foundation,
18  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
19  *
20  * Initial developer(s): Emmanuel Cecchet.
21  * Contributor(s): ______________________.
22  */
23
24 package org.objectweb.cjdbc.controller.virtualdatabase.protocol;
25
26 import java.sql.SQLException JavaDoc;
27
28 import org.objectweb.cjdbc.controller.requestmanager.TransactionMarkerMetaData;
29 import org.objectweb.cjdbc.controller.requestmanager.distributed.DistributedRequestManager;
30
31 /**
32  * This class defines an UnlogRollback command that is sent when a rollback has
33  * failed on all controllers and it is necessary for controllers without backend
34  * to remove this rollback from their recovery log since they systematically log
35  * all update statements.
36  *
37  * @author <a HREF="mailto:emmanuel.cecchet@emicnetworks.com">Emmanuel Cecchet
38  * </a>
39  * @version 1.0
40  */
41 public class UnlogRollback extends DistributedRequest
42 {
43   private static final long serialVersionUID = 2047719483769682759L;
44
45   private TransactionMarkerMetaData tm;
46
47   /**
48    * Creates a new <code>UnlogRollback</code> object
49    *
50    * @param tm the identifier of the rollbacked transaction to unlog from the
51    * recovery log on controller where the request should be unlogged
52    */
53   public UnlogRollback(TransactionMarkerMetaData tm)
54   {
55     super(null);
56     this.tm = tm;
57   }
58
59   /**
60    * @see org.objectweb.cjdbc.controller.virtualdatabase.protocol.DistributedRequest#scheduleRequest(org.objectweb.cjdbc.controller.requestmanager.distributed.DistributedRequestManager)
61    */
62   public final void scheduleRequest(DistributedRequestManager drm)
63       throws SQLException JavaDoc
64   {
65   }
66
67   /**
68    * @see org.objectweb.cjdbc.controller.virtualdatabase.protocol.DistributedRequest#executeScheduledRequest(org.objectweb.cjdbc.controller.requestmanager.distributed.DistributedRequestManager)
69    */
70   public final Object JavaDoc executeScheduledRequest(DistributedRequestManager drm)
71       throws SQLException JavaDoc
72   {
73     drm.removeFailedRollbackFromRecoveryLog(tm);
74     return null;
75   }
76
77 }
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