KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > objectweb > joram > mom > proxies > AckedQueue


1 /*
2  * JORAM: Java(TM) Open Reliable Asynchronous Messaging
3  * Copyright (C) 2004 - ScalAgent Distributed Technologies
4  * Copyright (C) 2004 - France Telecom R&D
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or 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  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19  * USA.
20  *
21  * Initial developer(s): ScalAgent Distributed Technologies
22  */
23 package org.objectweb.joram.mom.proxies;
24
25 import org.objectweb.util.monolog.api.BasicLevel;
26 import org.objectweb.joram.shared.JoramTracing;
27
28 import java.util.*;
29
30 public class AckedQueue implements java.io.Serializable JavaDoc {
31
32   private Vector list;
33
34   private int current;
35
36   public AckedQueue() {
37     list = new Vector();
38     current = 0;
39   }
40
41   public void push(ProxyMessage msg) {
42     if (JoramTracing.dbgProxy.isLoggable(BasicLevel.DEBUG))
43       JoramTracing.dbgProxy.log(
44         BasicLevel.DEBUG, "AckedQueue.push(" + msg + ')');
45     synchronized (list) {
46       list.addElement(msg);
47       list.notify();
48     }
49   }
50
51   public ProxyMessage get() throws InterruptedException JavaDoc {
52     if (JoramTracing.dbgProxy.isLoggable(BasicLevel.DEBUG))
53       JoramTracing.dbgProxy.log(
54         BasicLevel.DEBUG, "AckedQueue.get()");
55     synchronized (list) {
56       while ((list.size() - current) == 0) {
57     list.wait();
58       }
59       ProxyMessage msg =
60         (ProxyMessage)list.elementAt(current);
61       current++;
62       return msg;
63     }
64   }
65
66   public void ack(long ackId) {
67     if (JoramTracing.dbgProxy.isLoggable(BasicLevel.DEBUG))
68       JoramTracing.dbgProxy.log(
69         BasicLevel.DEBUG, "AckedQueue.ack(" + ackId + ')');
70     synchronized (list) {
71       while (list.size() > 0) {
72         ProxyMessage m =
73       (ProxyMessage)list.elementAt(0);
74     if (ackId < m.getId()) {
75       return;
76     } else {
77       // acked
78 if (JoramTracing.dbgProxy.isLoggable(BasicLevel.DEBUG))
79             JoramTracing.dbgProxy.log(
80               BasicLevel.DEBUG, "AckedQueue acked " + m.getId());
81       list.removeElementAt(0);
82           if (current > 0) {
83             current--;
84           }
85     }
86       }
87     }
88   }
89
90   public void reset() {
91     if (JoramTracing.dbgProxy.isLoggable(BasicLevel.DEBUG))
92       JoramTracing.dbgProxy.log(
93         BasicLevel.DEBUG, "AckedQueue.reset()");
94     current = 0;
95   }
96 }
97
Popular Tags