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Java > Open Source Codes > org > objectweb > cjdbc > common > monitor > cache > AbstractCacheStatsDataCollector


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.cache;
26
27 import org.objectweb.cjdbc.common.exceptions.DataCollectorException;
28 import org.objectweb.cjdbc.common.monitor.AbstractDataCollector;
29 import org.objectweb.cjdbc.controller.cache.result.AbstractResultCache;
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 template to factor code for cache collectors
36  *
37  * @author <a HREF="mailto:Nicolas.Modrzyk@inrialpes.fr">Nicolas Modrzyk </a>
38  */
39 public abstract class AbstractCacheStatsDataCollector
40     extends AbstractDataCollector
41 {
42   private String JavaDoc virtualDatabaseName;
43
44   /**
45    * new collector
46    *
47    * @param virtualDatabaseName database accessed to get data
48    */
49   public AbstractCacheStatsDataCollector(String JavaDoc virtualDatabaseName)
50   {
51     super();
52     this.virtualDatabaseName = virtualDatabaseName;
53   }
54
55   /**
56    * @see org.objectweb.cjdbc.common.monitor.AbstractDataCollector#collectValue()
57    */
58   public long collectValue() throws DataCollectorException
59   {
60     VirtualDatabase vdb = ((Controller) controller)
61         .getVirtualDatabase(virtualDatabaseName);
62     AbstractResultCache cache = vdb.getRequestManager().getResultCache();
63     if (cache == null)
64       throw new DataCollectorException(DataCollector.NO_CACHE_ENABLED);
65     return this.getValue(cache);
66   }
67
68   /**
69    * We have the cache object so let's get the value we want from ot
70    *
71    * @param cache as an object to allow it through RMI, but IS a
72    * <code>AbstractResultCache</code>
73    * @return the collected value
74    */
75   public abstract long getValue(Object JavaDoc cache);
76
77   /**
78    * @see org.objectweb.cjdbc.common.monitor.AbstractDataCollector#getTargetName()
79    */
80   public String JavaDoc getTargetName()
81   {
82     return virtualDatabaseName;
83   }
84 }
85
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