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Java > Open Source Codes > org > objectweb > cjdbc > common > monitor > backend > AbstractBackendDataCollector


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.common.monitor.backend;
26
27 import org.objectweb.cjdbc.common.exceptions.DataCollectorException;
28 import org.objectweb.cjdbc.common.monitor.AbstractDataCollector;
29 import org.objectweb.cjdbc.controller.backend.DatabaseBackend;
30 import org.objectweb.cjdbc.controller.core.Controller;
31 import org.objectweb.cjdbc.controller.monitoring.datacollector.DataCollector;
32 import org.objectweb.cjdbc.controller.virtualdatabase.VirtualDatabase;
33
34 /**
35  * Abstract class to factor code for collecting data from backends
36  *
37  * @author <a HREF="mailto:Nicolas.Modrzyk@inrialpes.fr">Nicolas Modrzyk </a>
38  */
39 public abstract class AbstractBackendDataCollector
40     extends AbstractDataCollector
41 {
42   private String JavaDoc backendName;
43   private String JavaDoc virtualDatabaseName;
44
45   /**
46    * Create new collector
47    *
48    * @param backendName of the backend to get data from
49    * @param virtualDatabaseName that contains reference to this backend
50    */
51   public AbstractBackendDataCollector(String JavaDoc backendName,
52       String JavaDoc virtualDatabaseName)
53   {
54     super();
55     this.backendName = backendName;
56     this.virtualDatabaseName = virtualDatabaseName;
57   }
58
59   /**
60    * @see org.objectweb.cjdbc.common.monitor.AbstractDataCollector#collectValue()
61    */
62   public long collectValue() throws DataCollectorException
63   {
64     try
65     {
66       VirtualDatabase vdb = ((Controller) controller)
67           .getVirtualDatabase(virtualDatabaseName);
68       DatabaseBackend db = vdb.getAndCheckBackend(backendName,
69           VirtualDatabase.NO_CHECK_BACKEND);
70       return this.getValue(db);
71     }
72     catch (Exception JavaDoc e)
73     {
74       throw new DataCollectorException(DataCollector.BACKEND_NOT_ACCESSIBLE);
75     }
76   }
77
78   /**
79    * get the proper collected value when we have instace of the backend
80    *
81    * @param backend <code>DatabaseBackend</code> instance
82    * @return collected value
83    */
84   public abstract long getValue(Object JavaDoc backend);
85
86   /**
87    * @see org.objectweb.cjdbc.common.monitor.AbstractDataCollector#getTargetName()
88    */
89   public String JavaDoc getTargetName()
90   {
91     return backendName;
92   }
93 }
94
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