Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/SynchronizedChar.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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0
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1 /* |
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2 File: SynchronizedChar.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 char 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 SynchronizedChar extends SynchronizedVariable implements Comparable, Cloneable { |
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23 |
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24 protected char value_; |
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25 |
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26 /** |
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27 * Make a new SynchronizedChar with the given initial value, |
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28 * and using its own internal lock. |
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29 **/ |
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30 public SynchronizedChar(char initialValue) { |
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31 super(); |
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32 value_ = initialValue; |
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33 } |
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34 |
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35 /** |
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36 * Make a new SynchronizedChar with the given initial value, |
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37 * and using the supplied lock. |
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38 **/ |
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39 public SynchronizedChar(char initialValue, Object lock) { |
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40 super(lock); |
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41 value_ = initialValue; |
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42 } |
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43 |
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44 /** |
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45 * Return the current value |
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46 **/ |
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47 public final char get() { synchronized(lock_) { return value_; } } |
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48 |
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49 /** |
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50 * Set to newValue. |
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51 * @return the old value |
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52 **/ |
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53 |
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54 public char set(char newValue) { |
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55 synchronized (lock_) { |
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56 char old = value_; |
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57 value_ = newValue; |
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58 return old; |
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59 } |
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60 } |
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61 |
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62 /** |
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63 * Set value to newValue only if it is currently assumedValue. |
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64 * @return true if successful |
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65 **/ |
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66 public boolean commit(char assumedValue, char newValue) { |
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67 synchronized(lock_) { |
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68 boolean success = (assumedValue == value_); |
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69 if (success) value_ = newValue; |
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70 return success; |
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71 } |
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72 } |
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73 |
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74 |
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75 /** |
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76 * Atomically swap values with another SynchronizedChar. |
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77 * Uses identityHashCode to avoid deadlock when |
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78 * two SynchronizedChars attempt to simultaneously swap with each other. |
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79 * (Note: Ordering via identyHashCode is not strictly guaranteed |
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80 * by the language specification to return unique, orderable |
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81 * values, but in practice JVMs rely on them being unique.) |
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82 * @return the new value |
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83 **/ |
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84 |
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85 public char swap(SynchronizedChar other) { |
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86 if (other == this) return get(); |
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87 SynchronizedChar fst = this; |
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88 SynchronizedChar snd = other; |
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89 if (System.identityHashCode(fst) > System.identityHashCode(snd)) { |
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90 fst = other; |
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91 snd = this; |
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92 } |
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93 synchronized(fst.lock_) { |
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94 synchronized(snd.lock_) { |
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95 fst.set(snd.set(fst.get())); |
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96 return get(); |
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97 } |
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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 * Add amount to value (i.e., set value += amount) |
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103 * @return the new value |
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104 **/ |
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105 public char add(char amount) { |
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106 synchronized (lock_) { |
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107 return value_ += amount; |
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108 } |
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109 } |
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110 |
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111 /** |
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112 * Subtract amount from value (i.e., set value -= amount) |
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113 * @return the new value |
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114 **/ |
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115 public char subtract(char amount) { |
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116 synchronized (lock_) { |
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117 return value_ -= amount; |
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118 } |
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119 } |
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120 |
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121 /** |
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122 * Multiply value by factor (i.e., set value *= factor) |
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123 * @return the new value |
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124 **/ |
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125 public synchronized char multiply(char factor) { |
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126 synchronized (lock_) { |
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127 return value_ *= factor; |
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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 * Divide value by factor (i.e., set value /= factor) |
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133 * @return the new value |
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134 **/ |
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135 public char divide(char factor) { |
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136 synchronized (lock_) { |
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137 return value_ /= factor; |
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138 } |
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139 } |
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140 |
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141 public int compareTo(char other) { |
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142 char val = get(); |
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143 return (val < other)? -1 : (val == other)? 0 : 1; |
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144 } |
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145 |
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146 public int compareTo(SynchronizedChar other) { |
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147 return compareTo(other.get()); |
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148 } |
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149 |
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150 public int compareTo(Object other) { |
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151 return compareTo((SynchronizedChar)other); |
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152 } |
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153 |
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154 public boolean equals(Object other) { |
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155 if (other != null && |
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156 other instanceof SynchronizedChar) |
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157 return get() == ((SynchronizedChar)other).get(); |
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158 else |
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159 return false; |
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160 } |
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161 |
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162 public int hashCode() { // same hash as Char |
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163 return (int)(get()); |
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164 } |
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165 |
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166 public String toString() { return String.valueOf(get()); } |
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167 |
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168 } |
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169 |