Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/WaitableBoolean.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: WaitableBoolean.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 19Jun1998 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 synch for boolean instance variables.
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18 *
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19 * <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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20 **/
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21
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22 public class WaitableBoolean extends SynchronizedBoolean {
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23
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24 /** Make a new WaitableBoolean with the given initial value **/
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25 public WaitableBoolean(boolean initialValue) { super(initialValue); }
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26
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27
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28 /**
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29 * Make a new WaitableBoolean with the given initial value,
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30 * and using the supplied lock.
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31 **/
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32 public WaitableBoolean(boolean initialValue, Object lock) {
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33 super(initialValue, lock);
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34 }
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35
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36
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37 public boolean set(boolean newValue) {
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38 synchronized (lock_) {
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39 lock_.notifyAll();
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40 return super.set(newValue);
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41 }
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42 }
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43
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44 public boolean commit(boolean assumedValue, boolean newValue) {
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45 synchronized (lock_) {
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46 boolean success = super.commit(assumedValue, newValue);
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47 if (success) lock_.notifyAll();
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48 return success;
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49 }
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50 }
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51
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52 public boolean complement() {
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53 synchronized (lock_) {
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54 lock_.notifyAll();
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55 return super.complement();
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56 }
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57 }
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58
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59 public boolean and(boolean b) {
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60 synchronized (lock_) {
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61 lock_.notifyAll();
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62 return super.and(b);
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63 }
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64 }
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65
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66 public boolean or(boolean b) {
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67 synchronized (lock_) {
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68 lock_.notifyAll();
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69 return super.or(b);
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70 }
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71 }
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72
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73 public boolean xor(boolean b) {
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74 synchronized (lock_) {
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75 lock_.notifyAll();
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76 return super.xor(b);
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77 }
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78 }
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79
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80 /**
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81 * Wait until value is false, then run action if nonnull.
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82 * The action is run with the synchronization lock held.
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83 **/
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84
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85 public void whenFalse(Runnable action) throws InterruptedException {
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86 synchronized (lock_) {
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87 while (value_) lock_.wait();
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88 if (action != null) action.run();
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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 * wait until value is true, then run action if nonnull.
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94 * The action is run with the synchronization lock held.
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95 **/
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96 public void whenTrue(Runnable action) throws InterruptedException {
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97 synchronized (lock_) {
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98 while (!value_) lock_.wait();
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99 if (action != null) action.run();
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100 }
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101 }
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102
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103 /**
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104 * Wait until value equals c, then run action if nonnull.
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105 * The action is run with the synchronization lock held.
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106 **/
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107
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108 public void whenEqual(boolean c, Runnable action) throws InterruptedException {
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109 synchronized (lock_) {
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110 while (!(value_ == c)) lock_.wait();
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111 if (action != null) action.run();
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112 }
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113 }
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114
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115 /**
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116 * wait until value not equal to c, then run action if nonnull.
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117 * The action is run with the synchronization lock held.
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118 **/
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119 public void whenNotEqual(boolean c, Runnable action) throws InterruptedException {
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120 synchronized (lock_) {
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121 while (!(value_ != c)) lock_.wait();
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122 if (action != null) action.run();
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123 }
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124 }
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125
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126 }
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127