| AverageStatistics.java |
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 }