1 /*
2 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26
27
28 package com.sun.org.glassfish.external.statistics.impl;
29
30 import java.util.concurrent.atomic.AtomicLong;
31 import java.util.Map;
32 import java.lang.reflect.*;
33 import com.sun.org.glassfish.external.statistics.AverageRangeStatistic;
34
35 /**
36 * An implementation of AverageRangeStatistic that provides ways to change the
37 * state externally through mutators. Convenience class that is useful for
38 * components that gather the statistical data.
39 * By merely changing the count (which is a mandatory measurement), rest of the statistical
40 * information could be deduced.
41 */
42
43 public final class AverageRangeStatisticImpl extends StatisticImpl implements
44 AverageRangeStatistic, InvocationHandler {
45
46 private long currentVal = 0L;
47 private long highWaterMark = Long.MIN_VALUE;
48 private long lowWaterMark = Long.MAX_VALUE;
49 private long numberOfSamples = 0L;
50 private long runningTotal = 0L;
51
52 private final long initCurrentVal;
53 private final long initHighWaterMark;
54 private final long initLowWaterMark;
55 private final long initNumberOfSamples;
56 private final long initRunningTotal;
57
58 private final AverageRangeStatistic as =
59 (AverageRangeStatistic) Proxy.newProxyInstance(
60 AverageRangeStatistic.class.getClassLoader(),
61 new Class[] { AverageRangeStatistic.class },
62 this);
63
64 public AverageRangeStatisticImpl(long curVal, long highMark, long lowMark,
65 String name, String unit, String desc,
66 long startTime, long sampleTime) {
67 super(name, unit, desc, startTime, sampleTime);
68 currentVal = curVal;
69 initCurrentVal = curVal;
70 highWaterMark = highMark;
71 initHighWaterMark = highMark;
72 lowWaterMark = lowMark;
73 initLowWaterMark = lowMark;
74 numberOfSamples = 0L;
75 initNumberOfSamples = numberOfSamples;
76 runningTotal = 0L;
77 initRunningTotal = runningTotal;
78 }
79
80 public synchronized AverageRangeStatistic getStatistic() {
81 return as;
82 }
83
84 public synchronized String toString() {
85 return super.toString() + NEWLINE +
86 "Current: " + getCurrent() + NEWLINE +
87 "LowWaterMark: " + getLowWaterMark() + NEWLINE +
88 "HighWaterMark: " + getHighWaterMark() + NEWLINE +
89 "Average:" + getAverage();
90 }
91
92 public synchronized Map getStaticAsMap() {
93 Map m = super.getStaticAsMap();
94 m.put("current", getCurrent());
95 m.put("lowwatermark", getLowWaterMark());
96 m.put("highwatermark", getHighWaterMark());
97 m.put("average", getAverage());
98 return m;
99 }
100
101 public synchronized void reset() {
102 super.reset();
103 currentVal = initCurrentVal;
104 highWaterMark = initHighWaterMark;
105 lowWaterMark = initLowWaterMark;
106 numberOfSamples = initNumberOfSamples;
107 runningTotal = initRunningTotal;
108 sampleTime = -1L;
109 }
110
111 public synchronized long getAverage() {
112 if(numberOfSamples == 0) {
113 return -1;
114 } else {
115 return runningTotal / numberOfSamples;
116 }
117 }
118
119 public synchronized long getCurrent() {
120 return currentVal;
121 }
122
123 public synchronized void setCurrent(long curVal) {
124 currentVal = curVal;
125 lowWaterMark = (curVal >= lowWaterMark ? lowWaterMark : curVal);
126 highWaterMark = (curVal >= highWaterMark ? curVal : highWaterMark);
127 numberOfSamples++;
128 runningTotal += curVal;
129 sampleTime = System.currentTimeMillis();
130 }
131
132 public synchronized long getHighWaterMark() {
133 return highWaterMark;
134 }
135
136 public synchronized long getLowWaterMark() {
137 return lowWaterMark;
138 }
139
140 // todo: equals implementation
141 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
142 Object result;
143 try {
144 result = method.invoke(this, args);
145 } catch (InvocationTargetException e) {
146 throw e.getTargetException();
147 } catch (Exception e) {
148 throw new RuntimeException("unexpected invocation exception: " +
149 e.getMessage());
150 } finally {
151 }
152 return result;
153 }
154
155 }