Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/SynchronizedShort.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: SynchronizedShort.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 short 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 SynchronizedShort extends SynchronizedVariable implements Comparable, Cloneable { |
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23 |
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24 protected short value_; |
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25 |
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26 /** |
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27 * Make a new SynchronizedShort 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 SynchronizedShort(short 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 SynchronizedShort 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 SynchronizedShort(short 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 short 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 short set(short newValue) { |
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55 synchronized (lock_) { |
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56 short 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(short assumedValue, short 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 SynchronizedShort. |
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77 * Uses identityHashCode to avoid deadlock when |
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78 * two SynchronizedShorts 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 short swap(SynchronizedShort other) { |
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86 if (other == this) return get(); |
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87 SynchronizedShort fst = this; |
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88 SynchronizedShort 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 /** |
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103 * Increment the value. |
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104 * @return the new value |
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105 **/ |
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106 public short increment() { |
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107 synchronized (lock_) { |
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108 return ++value_; |
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109 } |
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110 } |
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111 |
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112 /** |
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113 * Decrement the value. |
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114 * @return the new value |
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115 **/ |
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116 public short decrement() { |
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117 synchronized (lock_) { |
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118 return --value_; |
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119 } |
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120 } |
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121 |
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122 /** |
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123 * Add amount to value (i.e., set value += amount) |
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124 * @return the new value |
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125 **/ |
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126 public short add(short amount) { |
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127 synchronized (lock_) { |
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128 return value_ += amount; |
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129 } |
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130 } |
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131 |
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132 /** |
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133 * Subtract amount from value (i.e., set value -= amount) |
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134 * @return the new value |
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135 **/ |
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136 public short subtract(short amount) { |
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137 synchronized (lock_) { |
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138 return value_ -= amount; |
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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 * Multiply value by factor (i.e., set value *= factor) |
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144 * @return the new value |
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145 **/ |
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146 public synchronized short multiply(short factor) { |
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147 synchronized (lock_) { |
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148 return value_ *= factor; |
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149 } |
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150 } |
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151 |
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152 /** |
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153 * Divide value by factor (i.e., set value /= factor) |
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154 * @return the new value |
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155 **/ |
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156 public short divide(short factor) { |
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157 synchronized (lock_) { |
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158 return value_ /= factor; |
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159 } |
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160 } |
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161 |
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162 /** |
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163 * Set the value to the negative of its old value |
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164 * @return the new value |
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165 **/ |
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166 public short negate() { |
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167 synchronized (lock_) { |
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168 value_ = (short)(-value_); |
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169 return value_; |
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170 } |
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171 } |
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172 |
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173 /** |
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174 * Set the value to its complement |
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175 * @return the new value |
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176 **/ |
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177 public short complement() { |
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178 synchronized (lock_) { |
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179 value_ = (short)(~value_); |
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180 return value_; |
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181 } |
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182 } |
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183 |
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184 /** |
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185 * Set value to value & b. |
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186 * @return the new value |
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187 **/ |
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188 public short and(short b) { |
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189 synchronized (lock_) { |
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190 value_ = (short)(value_ & b); |
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191 return value_; |
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192 } |
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193 } |
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194 |
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195 /** |
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196 * Set value to value | b. |
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197 * @return the new value |
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198 **/ |
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199 public short or(short b) { |
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200 synchronized (lock_) { |
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201 value_ = (short)(value_ | b); |
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202 return value_; |
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203 } |
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204 } |
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205 |
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206 |
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207 /** |
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208 * Set value to value ^ b. |
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209 * @return the new value |
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210 **/ |
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211 public short xor(short b) { |
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212 synchronized (lock_) { |
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213 value_ = (short)(value_ ^ b); |
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214 return value_; |
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215 } |
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216 } |
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217 |
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218 public int compareTo(short other) { |
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219 short val = get(); |
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220 return (val < other)? -1 : (val == other)? 0 : 1; |
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221 } |
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222 |
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223 public int compareTo(SynchronizedShort other) { |
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224 return compareTo(other.get()); |
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225 } |
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226 |
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227 public int compareTo(Object other) { |
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228 return compareTo((SynchronizedShort)other); |
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229 } |
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230 |
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231 public boolean equals(Object other) { |
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232 if (other != null && |
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233 other instanceof SynchronizedShort) |
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234 return get() == ((SynchronizedShort)other).get(); |
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235 else |
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236 return false; |
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237 } |
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238 |
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239 public int hashCode() { |
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240 return (int)(get()); |
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241 } |
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242 |
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243 public String toString() { return String.valueOf(get()); } |
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244 |
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245 } |
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246 |