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Java > Open Source Codes > com > caucho > jmx > stats > RangeStats


1 /*
2  * Copyright (c) 1998-2006 Caucho Technology -- all rights reserved
3  *
4  * This file is part of Resin(R) Open Source
5  *
6  * Each copy or derived work must preserve the copyright notice and this
7  * notice unmodified.
8  *
9  * Resin Open Source is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * Resin Open Source is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
17  * of NON-INFRINGEMENT. See the GNU General Public License for more
18  * details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with Resin Open Source; if not, write to the
22  * Free SoftwareFoundation, Inc.
23  * 59 Temple Place, Suite 330
24  * Boston, MA 02111-1307 USA
25  *
26  * @author Scott Ferguson
27  */
28
29 package com.caucho.jmx.stats;
30
31 import com.caucho.util.Alarm;
32
33 /**
34  * Statistics for a range of values.
35  */
36 public class RangeStats {
37   private String JavaDoc _name;
38   private long _startTime;
39
40   private long _current;
41   private long _lowWaterMark;
42   private long _highWaterMark;
43
44   /**
45    * Create a null range stats.
46    */
47   public RangeStats()
48   {
49     _startTime = Alarm.getCurrentTime();
50   }
51
52   /**
53    * Create a null range stats.
54    */
55   public RangeStats(String JavaDoc name)
56   {
57     _startTime = Alarm.getCurrentTime();
58     
59     _name = name;
60   }
61
62   /**
63    * Returns the current value.
64    */
65   public long getCurrent()
66   {
67     return _current;
68   }
69
70   /**
71    * Returns the low water mark value.
72    */
73   public long getLowWaterMark()
74   {
75     return _lowWaterMark;
76   }
77
78   /**
79    * Returns the high water mark value.
80    */
81   public long getHighWaterMark()
82   {
83     return _highWaterMark;
84   }
85
86   /**
87    * Sets the current value.
88    */
89   public void setCurrent(long current)
90   {
91     _current = current;
92
93     if (current < _lowWaterMark)
94       _lowWaterMark = current;
95     
96     if (_highWaterMark < current)
97       _highWaterMark = current;
98   }
99
100   /**
101    * Resets the range.
102    */
103   public void reset()
104   {
105     _lowWaterMark = _highWaterMark = _current;
106   }
107 }
108
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