Source code: juju/reattore/util/RateStat.java
1 /* Reattore HTTP Server
2
3 Copyright (C) 2002 Michael Hope <michaelh@juju.net.nz>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 $Id: RateStat.java,v 1.5 2003/03/03 05:14:39 michaelh Exp $
20 */
21 package juju.reattore.util;
22
23
24 /** Statistic module that manages a rate of events.
25 */
26 public class RateStat extends BaseStat {
27 private long count;
28 private long total;
29 private long lastUpdate;
30
31 /** @see BaseStat */
32 public RateStat(Class clazz, String leaf) {
33 super(clazz, leaf);
34 }
35
36 /** Get the total number of samples added.
37
38 @return The number of samples.
39 */
40 public long getCount() {
41 return count;
42 }
43
44 /** Get the number of hits per second since this method was last
45 called.
46
47 @return Hits per second.
48 */
49 public double getRunningRate() {
50 long now = System.currentTimeMillis();
51
52 try {
53 return ((double) total * 1000) / (now - lastUpdate);
54 }
55 finally {
56 total = 0;
57 lastUpdate = now;
58 }
59 }
60
61 /** Cause a single hit on this stat.
62 */
63 public void inc() {
64 count++;
65 total++;
66 }
67
68 /** Adds a number of hits to this stat.
69
70 @param count The number of hits to add.
71 */
72 public void add(int count) {
73 total += count;
74 this.count++;
75 }
76
77 /** @see BaseStat */
78 protected String getDefaultFormat() {
79 return "{0} Count: {1} Running Rate: {2}/s";
80 }
81
82 /** @see BaseStat */
83 protected Object[] getFormatArgs() {
84 return new Object[] { getName(), new Long(getCount()), new Double(getRunningRate()) };
85 }
86 }