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annotate src/org/eclipse/jetty/util/statistic/CounterStatistic.java @ 803:166b16bda630

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remove org.eclipse.jetty.util.preventers
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 07 Sep 2016 21:21:32 -0600
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util.statistic;
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20
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21 import java.util.concurrent.atomic.AtomicLong;
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22
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23 import org.eclipse.jetty.util.Atomics;
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24
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25
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26 /* ------------------------------------------------------------ */
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27 /** Statistics on a counter value.
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28 * <p>
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29 * Keep total, current and maximum values of a counter that
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30 * can be incremented and decremented. The total refers only
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31 * to increments.
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32 *
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33 */
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34 public class CounterStatistic
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35 {
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36 protected final AtomicLong _max = new AtomicLong();
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37 protected final AtomicLong _curr = new AtomicLong();
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38 protected final AtomicLong _total = new AtomicLong();
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39
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40 /* ------------------------------------------------------------ */
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41 public void reset()
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42 {
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43 reset(0);
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44 }
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45
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46 /* ------------------------------------------------------------ */
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47 public void reset(final long value)
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48 {
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49 _max.set(value);
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50 _curr.set(value);
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51 _total.set(0); // total always set to 0 to properly calculate cumulative total
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52 }
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53
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54 /* ------------------------------------------------------------ */
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55 /**
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56 * @param delta the amount to add to the count
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57 */
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58 public void add(final long delta)
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59 {
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60 long value=_curr.addAndGet(delta);
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61 if (delta > 0)
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62 _total.addAndGet(delta);
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63 Atomics.updateMax(_max,value);
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64 }
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65
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66 /* ------------------------------------------------------------ */
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67 /**
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68 * @param delta the amount to subtract the count by.
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69 */
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70 public void subtract(final long delta)
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71 {
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72 add(-delta);
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73 }
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74
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75 /* ------------------------------------------------------------ */
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76 /**
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77 */
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78 public void increment()
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79 {
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80 add(1);
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81 }
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82
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83 /* ------------------------------------------------------------ */
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84 /**
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85 */
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86 public void decrement()
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87 {
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88 add(-1);
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89 }
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90
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91 /* ------------------------------------------------------------ */
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92 /**
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93 * @return max value
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94 */
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95 public long getMax()
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96 {
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97 return _max.get();
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98 }
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99
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100 /* ------------------------------------------------------------ */
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101 /**
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102 * @return current value
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103 */
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104 public long getCurrent()
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105 {
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106 return _curr.get();
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107 }
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108
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109 /* ------------------------------------------------------------ */
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110 /**
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111 * @return total value
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112 */
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113 public long getTotal()
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114 {
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115 return _total.get();
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116 }
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117 }