Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/WaitableChar.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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0
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1 /* |
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2 File: WaitableChar.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 char 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 WaitableChar extends SynchronizedChar { |
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24 /** |
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25 * Make a new WaitableChar 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 WaitableChar(char 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 WaitableChar 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 WaitableChar(char 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 char set(char 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(char assumedValue, char 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 char add(char 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 char subtract(char 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 char multiply(char 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 char divide(char 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(char 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(char 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(char 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(char 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(char 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(char 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 |