Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/SynchronizedByte.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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0
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1 /*
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2 File: SynchronizedByte.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 byte 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 SynchronizedByte extends SynchronizedVariable implements Comparable, Cloneable {
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23
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24 protected byte value_;
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25
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26 /**
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27 * Make a new SynchronizedByte 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 SynchronizedByte(byte 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 SynchronizedByte 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 SynchronizedByte(byte 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 byte 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 byte set(byte newValue) {
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55 synchronized (lock_) {
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56 byte 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(byte assumedValue, byte 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 SynchronizedByte.
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77 * Uses identityHashCode to avoid deadlock when
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78 * two SynchronizedBytes 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 byte swap(SynchronizedByte other) {
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86 if (other == this) return get();
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87 SynchronizedByte fst = this;
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88 SynchronizedByte 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 * Increment the value.
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103 * @return the new value
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104 **/
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105 public byte increment() {
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106 synchronized (lock_) {
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107 return ++value_;
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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 * Decrement the value.
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113 * @return the new value
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114 **/
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115 public byte decrement() {
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116 synchronized (lock_) {
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117 return --value_;
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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 * Add amount to value (i.e., set value += amount)
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123 * @return the new value
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124 **/
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125 public byte add(byte amount) {
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126 synchronized (lock_) {
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127 return value_ += amount;
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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 * Subtract amount from value (i.e., set value -= amount)
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133 * @return the new value
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134 **/
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135 public byte subtract(byte amount) {
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136 synchronized (lock_) {
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137 return value_ -= amount;
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138 }
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139 }
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140
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141 /**
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142 * Multiply value by factor (i.e., set value *= factor)
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143 * @return the new value
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144 **/
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145 public synchronized byte multiply(byte factor) {
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146 synchronized (lock_) {
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147 return value_ *= factor;
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148 }
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149 }
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150
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151 /**
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152 * Divide value by factor (i.e., set value /= factor)
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153 * @return the new value
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154 **/
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155 public byte divide(byte factor) {
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156 synchronized (lock_) {
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157 return value_ /= factor;
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158 }
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159 }
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160
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161 /**
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Dan Creswell <dan.creswell@gmail.com>
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162 * Set the value to the negative of its old value
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163 * @return the new value
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164 **/
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165 public byte negate() {
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166 synchronized (lock_) {
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167 value_ = (byte)(-value_);
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168 return value_;
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169 }
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170 }
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171
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172 /**
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173 * Set the value to its complement
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174 * @return the new value
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175 **/
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176 public byte complement() {
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177 synchronized (lock_) {
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178 value_ = (byte)~value_;
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179 return value_;
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180 }
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181 }
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182
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183 /**
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184 * Set value to value &amp; b.
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185 * @return the new value
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186 **/
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187 public byte and(byte b) {
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188 synchronized (lock_) {
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189 value_ = (byte)(value_ & b);
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190 return value_;
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191 }
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192 }
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193
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194 /**
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195 * Set value to value | b.
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196 * @return the new value
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197 **/
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198 public byte or(byte b) {
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199 synchronized (lock_) {
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200 value_ = (byte)(value_ | b);
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201 return value_;
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202 }
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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 * Set value to value ^ b.
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208 * @return the new value
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209 **/
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210 public byte xor(byte b) {
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211 synchronized (lock_) {
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212 value_ = (byte)(value_ ^ b);
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213 return value_;
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214 }
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215 }
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216
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217 public int compareTo(byte other) {
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218 byte val = get();
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219 return (val < other)? -1 : (val == other)? 0 : 1;
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220 }
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221
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222 public int compareTo(SynchronizedByte other) {
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223 return compareTo(other.get());
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224 }
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225
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226 public int compareTo(Object other) {
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227 return compareTo((SynchronizedByte)other);
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228 }
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229
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230 public boolean equals(Object other) {
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231 if (other != null &&
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Dan Creswell <dan.creswell@gmail.com>
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232 other instanceof SynchronizedByte)
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233 return get() == ((SynchronizedByte)other).get();
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234 else
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235 return false;
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236 }
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237
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238 public int hashCode() {
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239 return (int)(get());
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240 }
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241
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242 public String toString() { return Byte.toString(get()); }
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243
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244 }
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245