1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  /**
24   * The contents of this file are subject to the terms of the Common Development
25   * and Distribution License (the License). You may not use this file except in
26   * compliance with the License.
27   *
28   * You can obtain a copy of the License at http://www.sun.com/cddl/cddl.html and
29   * legal/CDDLv1.0.txt. See the License for the specific language governing
30   * permission and limitations under the License.
31   *
32   * When distributing Covered Code, include this CDDL Header Notice in each file
33   * and include the License file at legal/CDDLv1.0.txt.
34   *
35   * If applicable, add the following below the CDDL Header, with the fields
36   * enclosed by brackets [] replaced by your own identifying information:
37   * "Portions Copyrighted [year] [name of copyright owner]"
38   *
39   * Copyright 2009 Sun Microsystems Inc. All rights reserved.
40   */
41  
42  package com.liferay.portal.monitoring.statistics;
43  
44  /**
45   * <a href="RollingAverageStatistics.java.html"><b><i>View Source</i></b></a>
46   *
47   * @author Rajesh Thiagarajan
48   * @author Brian Wing Shun Chan
49   *
50   */
51  public class AverageStatistics extends BaseStatistics {
52  
53      public AverageStatistics(String name) {
54          super(name);
55  
56          _countStatistics = new CountStatistics(name);
57      }
58  
59      public void addDuration(long duration) {
60          _countStatistics.incrementCount();
61  
62          setLastTime(duration);
63  
64          if (getMaxTime() < duration) {
65              setMaxTime(duration);
66          }
67          else if ((getMinTime() == 0) || (getMinTime() > duration)) {
68              setMinTime(duration);
69          }
70  
71          if (_averageTime == 0) {
72              _averageTime = duration;
73          }
74          else {
75              long span = 0;
76  
77              if (_countStatistics.getCount() < getLowerBound()) {
78                  span = getLowerBound();
79              }
80              else if ((_countStatistics.getCount() > getUpperBound())) {
81                  span = getUpperBound();
82              }
83              else {
84                  span = _countStatistics.getCount();
85              }
86  
87              _averageTime = (_averageTime * span + duration) / (span + 1);
88          }
89  
90          setLastSampleTime(System.currentTimeMillis());
91      }
92  
93      public long getAverageTime() {
94          return _averageTime;
95      }
96  
97      public long getCount() {
98          return _countStatistics.getCount();
99      }
100 
101     public void reset() {
102         super.reset();
103 
104         _averageTime = 0;
105     }
106 
107     private long _averageTime;
108     private CountStatistics _countStatistics;
109 
110 }