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Java > Open Source Codes > org > jacorb > orb > giop > LFUSelectionStrategyImpl


1 /*
2  * JacORB - a free Java ORB
3  *
4  * Copyright (C) 1997-2004 Gerald Brose.
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public
17  * License along with this library; if not, write to the Free
18  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19  */
20
21 package org.jacorb.orb.giop;
22
23 import java.util.List JavaDoc;
24 import java.util.Iterator JavaDoc;
25
26 /**
27  * @author Nicolas Noffke
28  * @version $Id: LFUSelectionStrategyImpl.java,v 1.6 2004/05/06 12:40:00 nicolas Exp $
29  */
30
31 public class LFUSelectionStrategyImpl
32     implements SelectionStrategy
33 {
34     public ServerGIOPConnection selectForClose( List JavaDoc connections )
35     {
36         ServerGIOPConnection least_used = null;
37         double least_usage = Double.MAX_VALUE;
38
39         for( Iterator JavaDoc it = connections.iterator();
40              it.hasNext();
41              )
42         {
43             ServerGIOPConnection conn = (ServerGIOPConnection) it.next();
44             
45             if( ! conn.hasPendingMessages() )
46             {
47                 LFUStatisticsProviderImpl sp = (LFUStatisticsProviderImpl)
48                     conn.getStatisticsProvider();
49
50                 double frequency = sp.getFrequency();
51
52                 if( frequency < least_usage )
53                 {
54                     least_used = conn;
55                     least_usage = frequency;
56                 }
57             }
58         }
59
60         return least_used;
61     }
62 }
63
64
65
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