Source code: juju/reattore/util/GaugeStat.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: GaugeStat.java,v 1.4 2003/03/03 05:14:39 michaelh Exp $
20 */
21 package juju.reattore.util;
22
23
24 /** Statistic module that manages a gauge. A gauge is a statistic
25 that has a current value that goes up and down, such as the number
26 of connections.
27 */
28 public class GaugeStat extends BaseStat {
29 private long count;
30 private int current;
31 private int max;
32
33 /** @see BaseStat */
34 public GaugeStat(Class clazz, String leaf) {
35 super(clazz, leaf);
36 }
37
38 /** Get the total number of samples added.
39
40 @return The number of samples.
41 */
42 public long getCount() {
43 return count;
44 }
45
46 /** Increases this gauge.
47 */
48 public void inc() {
49 count++;
50 current++;
51
52 max = (current > max) ? current : max;
53 }
54
55 /** Decreases this gauge.
56 */
57 public void dec() {
58 count++;
59 current--;
60 }
61
62 /** Get the current value of the gauge.
63
64 @return The current value.
65 */
66 public int getCurrent() {
67 return current;
68 }
69
70 /** Get the maximum value this gauge has ever had.
71
72 @return The maximum value.
73 */
74 public int getMaximum() {
75 return max;
76 }
77
78 /** @see BaseStat */
79 protected String getDefaultFormat() {
80 return "{0} Count: {1} Current: {2} Max: {3}";
81 }
82
83 /** @see BaseStat */
84 protected Object[] getFormatArgs() {
85 return new Object[] {
86 getName(), new Long(getCount()), new Integer(getCurrent()),
87 new Integer(getMaximum())
88 };
89 }
90 }