Source code: com/act365/net/tcp/ISNCounter.java
1 /*
2 * JSocket Wrench
3 *
4 * Copyright (C) act365.com October 2003
5 *
6 * Web site: http://www.act365.com/wrench
7 * E-mail: developers@act365.com
8 *
9 * The JSocket Wrench library adds support for low-level Internet protocols
10 * to the Java programming language.
11 *
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the Free
14 * Software Foundation; either version 2 of the License, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
20 * Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License along with
23 * this program; if not, write to the Free Software Foundation, Inc.,
24 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 */
26
27 package com.act365.net.tcp ;
28
29 import java.util.Random ;
30
31 /**
32 Class ISNCounter provides access to a counter that is
33 updated each four milliseconds.
34 */
35
36 public class ISNCounter {
37
38 static int counter ;
39
40 static ISNUpdater updater ;
41
42 static Random random ;
43
44 static {
45 random = new Random();
46 update();
47 updater = new ISNUpdater( 4 );
48 updater.start();
49 }
50
51 public static int getCounter() {
52 return counter ;
53 }
54
55 static void update() {
56 counter = random.nextInt();
57 }
58
59 public static void terminate(){
60 updater.terminate();
61 }
62 }