1 /*
2 * Copyright (c) 2009, 2013, 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.Map;
31 import java.lang.reflect.*;
32 import com.sun.org.glassfish.external.statistics.AverageRangeStatistic;
33
34 /**
35 * An implementation of AverageRangeStatistic that provides ways to change the
36 * state externally through mutators. Convenience class that is useful for
37 * components that gather the statistical data.
38 * By merely changing the count (which is a mandatory measurement), rest of the statistical
39 * information could be deduced.
40 */
41
42 public final class AverageRangeStatisticImpl extends StatisticImpl implements
43 AverageRangeStatistic, InvocationHandler {
44
45 private long currentVal = 0L;
46 private long highWaterMark = Long.MIN_VALUE;
47 private long lowWaterMark = Long.MAX_VALUE;
48 private long numberOfSamples = 0L;
49 private long runningTotal = 0L;
50
51 private final long initCurrentVal;
52 private final long initHighWaterMark;
53 private final long initLowWaterMark;
54 private final long initNumberOfSamples;
55 private final long initRunningTotal;
56
57 private final AverageRangeStatistic as =
58 (AverageRangeStatistic) Proxy.newProxyInstance(
59 AverageRangeStatistic.class.getClassLoader(),
60 new Class[] { AverageRangeStatistic.class },
61 this);
62
63 public AverageRangeStatisticImpl(long curVal, long highMark, long lowMark,
64 String name, String unit, String desc,
65 long startTime, long sampleTime) {
66 super(name, unit, desc, startTime, sampleTime);
67 currentVal = curVal;
68 initCurrentVal = curVal;
69 highWaterMark = highMark;
70 initHighWaterMark = highMark;
71 lowWaterMark = lowMark;
72 initLowWaterMark = lowMark;
73 numberOfSamples = 0L;
74 initNumberOfSamples = numberOfSamples;
75 runningTotal = 0L;
76 initRunningTotal = runningTotal;
77 }
78
79 public synchronized AverageRangeStatistic getStatistic() {
80 return as;
81 }
82
83 public synchronized String toString() {
84 return super.toString() + NEWLINE +
85 "Current: " + getCurrent() + NEWLINE +
86 "LowWaterMark: " + getLowWaterMark() + NEWLINE +
87 "HighWaterMark: " + getHighWaterMark() + NEWLINE +
88 "Average:" + getAverage();
89 }
90
91 public synchronized Map getStaticAsMap() {
92 Map m = super.getStaticAsMap();
93 m.put("current", getCurrent());
94 m.put("lowwatermark", getLowWaterMark());
95 m.put("highwatermark", getHighWaterMark());
96 m.put("average", getAverage());
97 return m;
98 }
99
100 public synchronized void reset() {
101 super.reset();
102 currentVal = initCurrentVal;
103 highWaterMark = initHighWaterMark;
104 lowWaterMark = initLowWaterMark;
105 numberOfSamples = initNumberOfSamples;
106 runningTotal = initRunningTotal;
107 sampleTime = -1L;
108 }
109
110 public synchronized long getAverage() {
111 if(numberOfSamples == 0) {
112 return -1;
113 } else {
114 return runningTotal / numberOfSamples;
115 }
116 }
117
118 public synchronized long getCurrent() {
119 return currentVal;
120 }
121
122 public synchronized void setCurrent(long curVal) {
123 currentVal = curVal;
124 lowWaterMark = (curVal >= lowWaterMark ? lowWaterMark : curVal);
125 highWaterMark = (curVal >= highWaterMark ? curVal : highWaterMark);
126 numberOfSamples++;
127 runningTotal += curVal;
128 sampleTime = System.currentTimeMillis();
129 }
130
131 public synchronized long getHighWaterMark() {
132 return highWaterMark;
133 }
134
135 public synchronized long getLowWaterMark() {
136 return lowWaterMark;
137 }
138
139 // todo: equals implementation
140 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
141 checkMethod(method);
142
143 Object result;
144 try {
145 result = method.invoke(this, args);
146 } catch (InvocationTargetException e) {
147 throw e.getTargetException();
148 } catch (Exception e) {
149 throw new RuntimeException("unexpected invocation exception: " +
150 e.getMessage());
151 }
152 return result;
153 }
154
155 }