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Java > Open Source Codes > org > objectweb > cjdbc > controller > backend > BackendStateListener


1 /**
2  * C-JDBC: Clustered JDBC.
3  * Copyright (C) 2002-2004 French National Institute For Research In Computer
4  * Science And Control (INRIA).
5  * Contact: c-jdbc@objectweb.org
6  *
7  * This library is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU Lesser General Public License as published by the
9  * Free Software Foundation; either version 2.1 of the License, or any later
10  * version.
11  *
12  * This library is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
20  *
21  * Initial developer(s): Nicolas Modrzyk.
22  * Contributor(s): ______________________.
23  */
24
25 package org.objectweb.cjdbc.controller.backend;
26
27 import java.sql.SQLException JavaDoc;
28
29 import org.objectweb.cjdbc.common.log.Trace;
30 import org.objectweb.cjdbc.controller.recoverylog.BackendRecoveryInfo;
31 import org.objectweb.cjdbc.controller.recoverylog.RecoveryLog;
32
33 /**
34  * This class defines a BackendStateListener
35  *
36  * @author <a HREF="mailto:Nicolas.Modrzyk@inrialpes.fr">Nicolas Modrzyk </a>
37  * @version 1.0
38  */
39 public class BackendStateListener
40 {
41
42   Trace logger = Trace.getLogger(BackendStateListener.class
43                                      .getName());
44   private String JavaDoc virtualDatabaseName;
45   private RecoveryLog recoveryLog;
46
47   /**
48    * Creates a new <code>BackendStateListener</code> object
49    *
50    * @param vdbName virtual database name
51    * @param recoveryLog recovery log
52    */
53   public BackendStateListener(String JavaDoc vdbName, RecoveryLog recoveryLog)
54   {
55     this.virtualDatabaseName = vdbName;
56     this.recoveryLog = recoveryLog;
57   }
58
59   /**
60    * Update the persistent state of the backend in the recovery log
61    *
62    * @param backend the backend to update information from
63    */
64   public synchronized void changeState(DatabaseBackend backend)
65   {
66     try
67     {
68       recoveryLog.storeBackendRecoveryInfo(virtualDatabaseName,
69           new BackendRecoveryInfo(backend.getName(), backend
70               .getLastKnownCheckpoint(), backend.getStateValue(),
71               virtualDatabaseName));
72     }
73     catch (SQLException JavaDoc e)
74     {
75       logger.error("Could not store informatione for backend:"
76           + backend.getName(), e);
77     }
78   }
79 }
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