Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/WaitableDouble.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /*
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2 File: WaitableDouble.java
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3
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4 Originally written by Doug Lea and released into the public domain.
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5 This may be used for any purposes whatsoever without acknowledgment.
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6 Thanks for the assistance and support of Sun Microsystems Labs,
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7 and everyone contributing, testing, and using this code.
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8
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9 History:
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10 Date Who What
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11 23Jun1998 dl Create public version
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12 */
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13
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14 package EDU.oswego.cs.dl.util.concurrent;
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15
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16 /**
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17 * A class useful for offloading waiting and signalling operations
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18 * on single double variables.
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19 * <p>
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20 * <p>[<a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html"> Introduction to this package. </a>]
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21 **/
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22
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23 public class WaitableDouble extends SynchronizedDouble {
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24 /**
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25 * Make a new WaitableDouble with the given initial value,
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26 * and using its own internal lock.
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27 **/
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28 public WaitableDouble(double initialValue) {
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29 super(initialValue);
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30 }
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31
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32 /**
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33 * Make a new WaitableDouble with the given initial value,
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34 * and using the supplied lock.
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35 **/
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36 public WaitableDouble(double initialValue, Object lock) {
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37 super(initialValue, lock);
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38 }
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39
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40
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41 public double set(double newValue) {
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42 synchronized (lock_) {
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43 lock_.notifyAll();
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44 return super.set(newValue);
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45 }
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46 }
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47
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48 public boolean commit(double assumedValue, double newValue) {
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49 synchronized (lock_) {
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50 boolean success = super.commit(assumedValue, newValue);
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51 if (success) lock_.notifyAll();
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52 return success;
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53 }
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54 }
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55
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56
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57 public double add(double amount) {
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58 synchronized (lock_) {
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59 lock_.notifyAll();
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60 return super.add(amount);
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61 }
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62 }
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63
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64 public double subtract(double amount) {
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65 synchronized (lock_) {
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66 lock_.notifyAll();
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67 return super.subtract(amount);
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68 }
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69 }
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70
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71 public double multiply(double factor) {
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72 synchronized (lock_) {
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73 lock_.notifyAll();
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74 return super.multiply(factor);
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75 }
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76 }
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77
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78 public double divide(double factor) {
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79 synchronized (lock_) {
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80 lock_.notifyAll();
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81 return super.divide(factor);
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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 /**
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87 * Wait until value equals c, then run action if nonnull.
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88 * The action is run with the synchronization lock held.
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89 **/
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90
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91 public void whenEqual(double c, Runnable action) throws InterruptedException {
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92 synchronized(lock_) {
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93 while (!(value_ == c)) lock_.wait();
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94 if (action != null) action.run();
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95 }
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96 }
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97
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98 /**
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99 * wait until value not equal to c, then run action if nonnull.
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100 * The action is run with the synchronization lock held.
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101 **/
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102 public void whenNotEqual(double c, Runnable action) throws InterruptedException {
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103 synchronized (lock_) {
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104 while (!(value_ != c)) lock_.wait();
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105 if (action != null) action.run();
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106 }
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107 }
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108
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109 /**
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110 * wait until value less than or equal to c, then run action if nonnull.
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111 * The action is run with the synchronization lock held.
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112 **/
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113 public void whenLessEqual(double c, Runnable action) throws InterruptedException {
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114 synchronized (lock_) {
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115 while (!(value_ <= c)) lock_.wait();
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116 if (action != null) action.run();
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117 }
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118 }
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119
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120 /**
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121 * wait until value less than c, then run action if nonnull.
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122 * The action is run with the synchronization lock held.
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123 **/
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124 public void whenLess(double c, Runnable action) throws InterruptedException {
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125 synchronized (lock_) {
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126 while (!(value_ < c)) lock_.wait();
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127 if (action != null) action.run();
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128 }
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129 }
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130
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131 /**
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132 * wait until value greater than or equal to c, then run action if nonnull.
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133 * The action is run with the synchronization lock held.
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134 **/
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135 public void whenGreaterEqual(double c, Runnable action) throws InterruptedException {
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136 synchronized (lock_) {
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137 while (!(value_ >= c)) lock_.wait();
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138 if (action != null) action.run();
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139 }
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140 }
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141
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142 /**
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143 * wait until value greater than c, then run action if nonnull.
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144 * The action is run with the synchronization lock held.
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145 **/
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146 public void whenGreater(double c, Runnable action) throws InterruptedException {
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147 synchronized (lock_) {
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148 while (!(value_ > c)) lock_.wait();
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149 if (action != null) action.run();
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150 }
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151 }
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152
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153 }
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154