Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/SynchronizedLong.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: SynchronizedLong.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 long 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 SynchronizedLong extends SynchronizedVariable implements Comparable, Cloneable {
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23
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24 protected long value_;
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25
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26 /**
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27 * Make a new SynchronizedLong 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 SynchronizedLong(long 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 SynchronizedLong 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 SynchronizedLong(long 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 long 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 long set(long newValue) {
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55 synchronized (lock_) {
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56 long 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(long assumedValue, long 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 * Atomically swap values with another SynchronizedLong.
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76 * Uses identityHashCode to avoid deadlock when
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77 * two SynchronizedLongs attempt to simultaneously swap with each other.
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78 * @return the new value
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79 **/
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80
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81 public long swap(SynchronizedLong other) {
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82 if (other != this) {
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83 SynchronizedLong fst = this;
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84 SynchronizedLong snd = other;
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85 if (System.identityHashCode(fst) > System.identityHashCode(snd)) {
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86 fst = other;
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87 snd = this;
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88 }
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89 synchronized(fst.lock_) {
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90 synchronized(snd.lock_) {
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91 fst.set(snd.set(fst.get()));
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92 }
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93 }
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94 }
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95 return value_;
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96 }
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97
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98 /**
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99 * Increment the value.
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100 * @return the new value
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101 **/
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102 public long increment() {
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103 synchronized (lock_) {
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104 return ++value_;
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105 }
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106 }
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107
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108 /**
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109 * Decrement the value.
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110 * @return the new value
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111 **/
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112 public long decrement() {
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113 synchronized (lock_) {
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114 return --value_;
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115 }
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116 }
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117
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118 /**
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119 * Add amount to value (i.e., set value += amount)
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120 * @return the new value
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121 **/
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122 public long add(long amount) {
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123 synchronized (lock_) {
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124 return value_ += amount;
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125 }
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126 }
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127
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128 /**
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129 * Subtract amount from value (i.e., set value -= amount)
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130 * @return the new value
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131 **/
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132 public long subtract(long amount) {
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133 synchronized (lock_) {
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134 return value_ -= amount;
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135 }
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136 }
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137
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138 /**
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139 * Multiply value by factor (i.e., set value *= factor)
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140 * @return the new value
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141 **/
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142 public synchronized long multiply(long factor) {
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143 synchronized (lock_) {
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144 return value_ *= factor;
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145 }
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146 }
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147
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148 /**
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Dan Creswell <dan.creswell@gmail.com>
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149 * Divide value by factor (i.e., set value /= factor)
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150 * @return the new value
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151 **/
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152 public long divide(long factor) {
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153 synchronized (lock_) {
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154 return value_ /= factor;
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Dan Creswell <dan.creswell@gmail.com>
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155 }
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156 }
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157
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158 /**
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Dan Creswell <dan.creswell@gmail.com>
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159 * Set the value to the negative of its old value
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Dan Creswell <dan.creswell@gmail.com>
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160 * @return the new value
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161 **/
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Dan Creswell <dan.creswell@gmail.com>
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162 public long negate() {
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Dan Creswell <dan.creswell@gmail.com>
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163 synchronized (lock_) {
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164 value_ = -value_;
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Dan Creswell <dan.creswell@gmail.com>
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165 return value_;
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166 }
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Dan Creswell <dan.creswell@gmail.com>
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167 }
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Dan Creswell <dan.creswell@gmail.com>
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168
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Dan Creswell <dan.creswell@gmail.com>
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169 /**
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Dan Creswell <dan.creswell@gmail.com>
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170 * Set the value to its complement
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Dan Creswell <dan.creswell@gmail.com>
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171 * @return the new value
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172 **/
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Dan Creswell <dan.creswell@gmail.com>
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173 public long complement() {
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174 synchronized (lock_) {
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175 value_ = ~value_;
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176 return value_;
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177 }
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178 }
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179
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Dan Creswell <dan.creswell@gmail.com>
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180 /**
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Dan Creswell <dan.creswell@gmail.com>
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181 * Set value to value &amp; b.
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Dan Creswell <dan.creswell@gmail.com>
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182 * @return the new value
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183 **/
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Dan Creswell <dan.creswell@gmail.com>
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184 public long and(long b) {
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185 synchronized (lock_) {
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186 value_ = value_ & b;
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187 return value_;
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188 }
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189 }
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190
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Dan Creswell <dan.creswell@gmail.com>
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191 /**
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Dan Creswell <dan.creswell@gmail.com>
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192 * Set value to value | b.
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193 * @return the new value
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194 **/
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195 public long or(long b) {
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196 synchronized (lock_) {
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197 value_ = value_ | b;
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198 return value_;
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199 }
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200 }
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201
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202
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203 /**
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204 * Set value to value ^ b.
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205 * @return the new value
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206 **/
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207 public long xor(long b) {
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208 synchronized (lock_) {
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209 value_ = value_ ^ b;
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210 return value_;
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211 }
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212 }
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213
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214
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215 public int compareTo(long other) {
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216 long val = get();
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217 return (val < other)? -1 : (val == other)? 0 : 1;
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218 }
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219
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220 public int compareTo(SynchronizedLong other) {
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221 return compareTo(other.get());
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Dan Creswell <dan.creswell@gmail.com>
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222 }
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223
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224 public int compareTo(Object other) {
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225 return compareTo((SynchronizedLong)other);
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Dan Creswell <dan.creswell@gmail.com>
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226 }
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Dan Creswell <dan.creswell@gmail.com>
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227
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228 public boolean equals(Object other) {
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229 if (other != null &&
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Dan Creswell <dan.creswell@gmail.com>
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230 other instanceof SynchronizedLong)
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231 return get() == ((SynchronizedLong)other).get();
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232 else
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233 return false;
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234 }
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235
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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236 public int hashCode() { // same expression as java.lang.Long
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237 long v = get();
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Dan Creswell <dan.creswell@gmail.com>
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238 return (int)(v ^ (v >> 32));
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Dan Creswell <dan.creswell@gmail.com>
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239 }
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Dan Creswell <dan.creswell@gmail.com>
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240
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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241 public String toString() { return String.valueOf(get()); }
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242
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Dan Creswell <dan.creswell@gmail.com>
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243 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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244