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1 /* |
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2 * Copyright (c) 2009, 2013, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 |
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27 |
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28 package com.sun.org.glassfish.external.statistics.impl; |
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29 |
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30 import java.util.Map; |
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31 import java.lang.reflect.*; |
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32 import com.sun.org.glassfish.external.statistics.AverageRangeStatistic; |
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33 |
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34 /** |
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35 * An implementation of AverageRangeStatistic that provides ways to change the |
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36 * state externally through mutators. Convenience class that is useful for |
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37 * components that gather the statistical data. |
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38 * By merely changing the count (which is a mandatory measurement), rest of the statistical |
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39 * information could be deduced. |
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40 */ |
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41 |
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42 public final class AverageRangeStatisticImpl extends StatisticImpl implements |
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43 AverageRangeStatistic, InvocationHandler { |
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44 |
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45 private long currentVal = 0L; |
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46 private long highWaterMark = Long.MIN_VALUE; |
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47 private long lowWaterMark = Long.MAX_VALUE; |
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48 private long numberOfSamples = 0L; |
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49 private long runningTotal = 0L; |
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50 |
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51 private final long initCurrentVal; |
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52 private final long initHighWaterMark; |
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53 private final long initLowWaterMark; |
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54 private final long initNumberOfSamples; |
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55 private final long initRunningTotal; |
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56 |
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57 private final AverageRangeStatistic as = |
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58 (AverageRangeStatistic) Proxy.newProxyInstance( |
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59 AverageRangeStatistic.class.getClassLoader(), |
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60 new Class[] { AverageRangeStatistic.class }, |
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61 this); |
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62 |
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63 public AverageRangeStatisticImpl(long curVal, long highMark, long lowMark, |
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64 String name, String unit, String desc, |
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65 long startTime, long sampleTime) { |
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66 super(name, unit, desc, startTime, sampleTime); |
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67 currentVal = curVal; |
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68 initCurrentVal = curVal; |
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69 highWaterMark = highMark; |
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70 initHighWaterMark = highMark; |
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71 lowWaterMark = lowMark; |
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72 initLowWaterMark = lowMark; |
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73 numberOfSamples = 0L; |
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74 initNumberOfSamples = numberOfSamples; |
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75 runningTotal = 0L; |
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76 initRunningTotal = runningTotal; |
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77 } |
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78 |
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79 public synchronized AverageRangeStatistic getStatistic() { |
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80 return as; |
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81 } |
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82 |
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83 public synchronized String toString() { |
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84 return super.toString() + NEWLINE + |
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85 "Current: " + getCurrent() + NEWLINE + |
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86 "LowWaterMark: " + getLowWaterMark() + NEWLINE + |
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87 "HighWaterMark: " + getHighWaterMark() + NEWLINE + |
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88 "Average:" + getAverage(); |
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89 } |
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90 |
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91 public synchronized Map getStaticAsMap() { |
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92 Map m = super.getStaticAsMap(); |
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93 m.put("current", getCurrent()); |
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94 m.put("lowwatermark", getLowWaterMark()); |
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95 m.put("highwatermark", getHighWaterMark()); |
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96 m.put("average", getAverage()); |
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97 return m; |
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98 } |
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99 |
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100 public synchronized void reset() { |
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101 super.reset(); |
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102 currentVal = initCurrentVal; |
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103 highWaterMark = initHighWaterMark; |
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104 lowWaterMark = initLowWaterMark; |
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105 numberOfSamples = initNumberOfSamples; |
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106 runningTotal = initRunningTotal; |
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107 sampleTime = -1L; |
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108 } |
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109 |
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110 public synchronized long getAverage() { |
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111 if(numberOfSamples == 0) { |
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112 return -1; |
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113 } else { |
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114 return runningTotal / numberOfSamples; |
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115 } |
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116 } |
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117 |
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118 public synchronized long getCurrent() { |
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119 return currentVal; |
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120 } |
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121 |
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122 public synchronized void setCurrent(long curVal) { |
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123 currentVal = curVal; |
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124 lowWaterMark = (curVal >= lowWaterMark ? lowWaterMark : curVal); |
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125 highWaterMark = (curVal >= highWaterMark ? curVal : highWaterMark); |
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126 numberOfSamples++; |
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127 runningTotal += curVal; |
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128 sampleTime = System.currentTimeMillis(); |
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129 } |
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130 |
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131 public synchronized long getHighWaterMark() { |
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132 return highWaterMark; |
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133 } |
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134 |
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135 public synchronized long getLowWaterMark() { |
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136 return lowWaterMark; |
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137 } |
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138 |
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139 // todo: equals implementation |
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140 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
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141 checkMethod(method); |
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142 |
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143 Object result; |
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144 try { |
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145 result = method.invoke(this, args); |
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146 } catch (InvocationTargetException e) { |
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147 throw e.getTargetException(); |
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148 } catch (Exception e) { |
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149 throw new RuntimeException("unexpected invocation exception: " + |
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150 e.getMessage()); |
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151 } |
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152 return result; |
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153 } |
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154 |
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155 } |