1 /*
2 * Copyright (c) 1997, 2007, 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 package com.sun.org.glassfish.external.statistics.impl;
27
28 import java.util.concurrent.atomic.AtomicLong;
29 import java.util.Map;
30 import java.lang.reflect.*;
31 import com.sun.org.glassfish.external.statistics.AverageRangeStatistic;
32
33 /**
34 * An implementation of AverageRangeStatistic that provides ways to change the
35 * state externally through mutators. Convenience class that is useful for
36 * components that gather the statistical data.
37 * By merely changing the count (which is a mandatory measurement), rest of the statistical
38 * information could be deduced.
39 */
40
41 public final class AverageRangeStatisticImpl extends StatisticImpl implements
42 AverageRangeStatistic, InvocationHandler {
43
44 private long currentVal = 0L;
45 private long highWaterMark = Long.MIN_VALUE;
46 private long lowWaterMark = Long.MAX_VALUE;
47 private long numberOfSamples = 0L;
48 private long runningTotal = 0L;
49
50 private final long initCurrentVal;
51 private final long initHighWaterMark;
52 private final long initLowWaterMark;
53 private final long initNumberOfSamples;
54 private final long initRunningTotal;
55
56 private final AverageRangeStatistic as =
57 (AverageRangeStatistic) Proxy.newProxyInstance(
58 AverageRangeStatistic.class.getClassLoader(),
59 new Class[] { AverageRangeStatistic.class },
60 this);
61
62 public AverageRangeStatisticImpl(long curVal, long highMark, long lowMark,
63 String name, String unit, String desc,
64 long startTime, long sampleTime) {
65 super(name, unit, desc, startTime, sampleTime);
66 currentVal = curVal;
67 initCurrentVal = curVal;
68 highWaterMark = highMark;
69 initHighWaterMark = highMark;
70 lowWaterMark = lowMark;
71 initLowWaterMark = lowMark;
72 numberOfSamples = 0L;
73 initNumberOfSamples = numberOfSamples;
74 runningTotal = 0L;
75 initRunningTotal = runningTotal;
76 }
77
78 public synchronized AverageRangeStatistic getStatistic() {
79 return as;
80 }
81
82 public synchronized String toString() {
83 return super.toString() + NEWLINE +
84 "Current: " + getCurrent() + NEWLINE +
85 "LowWaterMark: " + getLowWaterMark() + NEWLINE +
86 "HighWaterMark: " + getHighWaterMark() + NEWLINE +
87 "Average:" + getAverage();
88 }
89
90 public synchronized Map getStaticAsMap() {
91 Map m = super.getStaticAsMap();
92 m.put("current", getCurrent());
93 m.put("lowwatermark", getLowWaterMark());
94 m.put("highwatermark", getHighWaterMark());
95 m.put("average", getAverage());
96 return m;
97 }
98
99 public synchronized void reset() {
100 super.reset();
101 currentVal = initCurrentVal;
102 highWaterMark = initHighWaterMark;
103 lowWaterMark = initLowWaterMark;
104 numberOfSamples = initNumberOfSamples;
105 runningTotal = initRunningTotal;
106 sampleTime = -1L;
107 }
108
109 public synchronized long getAverage() {
110 if(numberOfSamples == 0) {
111 return -1;
112 } else {
113 return runningTotal / numberOfSamples;
114 }
115 }
116
117 public synchronized long getCurrent() {
118 return currentVal;
119 }
120
121 public synchronized void setCurrent(long curVal) {
122 currentVal = curVal;
123 lowWaterMark = (curVal >= lowWaterMark ? lowWaterMark : curVal);
124 highWaterMark = (curVal >= highWaterMark ? curVal : highWaterMark);
125 numberOfSamples++;
126 runningTotal += curVal;
127 sampleTime = System.currentTimeMillis();
128 }
129
130 public synchronized long getHighWaterMark() {
131 return highWaterMark;
132 }
133
134 public synchronized long getLowWaterMark() {
135 return lowWaterMark;
136 }
137
138 // todo: equals implementation
139 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
140 Object result;
141 try {
142 result = method.invoke(this, args);
143 } catch (InvocationTargetException e) {
144 throw e.getTargetException();
145 } catch (Exception e) {
146 throw new RuntimeException("unexpected invocation exception: " +
147 e.getMessage());
148 } finally {
149 }
150 return result;
151 }
152
153 }