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annotate src/org/eclipse/jetty/util/statistic/CounterStatistic.java @ 806:49cbf6ee529f
include property files in build
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Wed, 07 Sep 2016 22:50:42 -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 } |