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Java > Open Source Codes > org > jboss > jmx > adaptor > snmp > agent > Clock


1 /*
2  * Copyright (c) 2003, Intracom S.A. - www.intracom.com
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17  *
18  * This package and its source code is available at www.jboss.org
19 **/
20 package org.jboss.jmx.adaptor.snmp.agent;
21
22 /**
23  * Utility class that provides time keeping from the time of instantiation.
24  * Can be queried for time readings since the last incarnation in msecs.
25  *
26  * @version $Revision: 44604 $
27  *
28  * @author <a HREF="mailto:spol@intracom.gr">Spyros Pollatos</a>
29  * @author <a HREF="mailto:dimitris@jboss.org">Dimitris Andreadis</a>
30  */
31 public final class Clock
32 {
33    /** Holds instantiation time */
34    private long instantiationTime;
35           
36    /**
37     * CTOR - creates time counter with zeroed out clock
38     */
39    public Clock()
40    {
41         this.instantiationTime = System.currentTimeMillis();
42    }
43
44    /**
45     * Returns the difference, measured in milliseconds, between the
46     * instantiation time and midnight, January 1, 1970 UTC.
47     */
48    public long instantiationTime()
49    {
50       return this.instantiationTime;
51    }
52     
53    /**
54     * Returns the elapsed time in msecs from the time of instantiation.
55     */
56    public long uptime()
57    {
58       return System.currentTimeMillis() - this.instantiationTime;
59    }
60
61 } // class Clock
62
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