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Java > Open Source Codes > com > sun > jmx > snmp > daemon > SnmpRequestCounter


1 /*
2  * @(#)file SnmpRequestCounter.java
3  * @(#)author Sun Microsystems, Inc.
4  * @(#)version 1.4
5  * @(#)date 08/02/09
6  *
7  * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
8  * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
9  *
10  */
11 // Copyright (c) 1995-96 by Cisco Systems, Inc.
12
13 package com.sun.jmx.snmp.daemon;
14
15
16 /**
17  * A static instance of this class is usually created. It contains a
18  * counter that is incremented every time it is accessed. For example,
19  * this class can be used in <CODE>SnmpSession</CODE> to generate a request
20  * identifier that is used to identify a message in a client-server session.
21  * The class wraps around when it reaches the maximum positive value, 2^31 - 1.
22  */
23
24 final class SnmpRequestCounter {
25     /**
26      * A counter with value between 1...2^31-1.
27      */
28     int reqid = 0 ;
29
30     public SnmpRequestCounter() {}
31
32     /**
33      * Returns the next request identifier.
34      * @return next request identifier. The value wraps to 1 if it reaches negative value.
35      */
36     public synchronized int getNewId() {
37         if (++reqid < 0)
38             reqid = 1 ;
39         return reqid ;
40     }
41 }
42
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