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Java > Open Source Codes > org > jacorb > notification > queue > EventQueueOverflowStrategy


1 package org.jacorb.notification.queue;
2
3 /*
4  * JacORB - a free Java ORB
5  *
6  * Copyright (C) 1999-2004 Gerald Brose
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Library General Public
10  * License as published by the Free Software Foundation; either
11  * version 2 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Library General Public License for more details.
17  *
18  * You should have received a copy of the GNU Library General Public
19  * License along with this library; if not, write to the Free
20  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  */
23
24 import org.jacorb.notification.interfaces.Message;
25
26 /**
27  * @author Alphonse Bendt
28  * @version $Id: EventQueueOverflowStrategy.java,v 1.3 2005/02/14 00:11:10 alphonse.bendt Exp $
29  */
30
31 public abstract class EventQueueOverflowStrategy
32 {
33     public abstract Message removeElementFromQueue( AbstractBoundedEventQueue queue );
34
35     public static final EventQueueOverflowStrategy FIFO =
36         new EventQueueOverflowStrategy()
37         {
38             public Message removeElementFromQueue( AbstractBoundedEventQueue queue )
39             {
40                 return queue.getOldestElement();
41             }
42         };
43
44     public static final EventQueueOverflowStrategy LIFO =
45         new EventQueueOverflowStrategy()
46         {
47             public Message removeElementFromQueue( AbstractBoundedEventQueue queue )
48             {
49                 return queue.getYoungestElement();
50             }
51         };
52
53     public static final EventQueueOverflowStrategy LEAST_PRIORITY =
54         new EventQueueOverflowStrategy()
55         {
56             public Message removeElementFromQueue( AbstractBoundedEventQueue queue )
57             {
58                 return queue.getLeastPriority();
59             }
60         };
61
62     public static final EventQueueOverflowStrategy EARLIEST_TIMEOUT =
63         new EventQueueOverflowStrategy()
64         {
65             public Message removeElementFromQueue( AbstractBoundedEventQueue queue )
66             {
67                 return queue.getEarliestTimeout();
68             }
69         };
70 }
71
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