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Java > Open Source Codes > com > sun > appserv > management > util > misc > PrintMillis


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23  
24 /*
25  * $Header: /cvs/glassfish/admin-core/mbeanapi/src/java/com/sun/appserv/management/util/misc/PrintMillis.java,v 1.3 2005/12/25 03:51:50 tcfujii Exp $
26  * $Revision: 1.3 $
27  * $Date: 2005/12/25 03:51:50 $
28  */
29 package com.sun.appserv.management.util.misc;
30
31 /**
32     Useful for printing elapsed timings out. Example:
33     
34     <code>
35     final PrintMillis timer = new PrintMillis();
36     ...
37     timer.println( "start" );
38     ...
39     timer.println( "middle" );
40     ...
41     ...
42     timer.println( "end" );
43     </code>
44  */
45 public class PrintMillis
46 {
47     private long mLast = System.currentTimeMillis();
48     
49         public
50     PrintMillis()
51     {
52         mLast = System.currentTimeMillis();
53     }
54     
55     /**
56         Print out the milliseconds that have elapsed since the last call.
57      */
58         public void
59     println( String JavaDoc msg )
60     {
61         final long elapsed = System.currentTimeMillis() - mLast;
62         
63         // this printing to System.out is BY DESIGN, so leave it.
64 System.out.println( (msg == null ? "" : msg) + ": " + elapsed );
65         
66         mLast = System.currentTimeMillis();
67     }
68 }
69
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