Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/SynchronizedFloat.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: SynchronizedFloat.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 float 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 SynchronizedFloat extends SynchronizedVariable implements Comparable, Cloneable {
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23
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24 protected float value_;
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25
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26 /**
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27 * Make a new SynchronizedFloat 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 SynchronizedFloat(float 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 SynchronizedFloat 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 SynchronizedFloat(float 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 float 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 float set(float newValue) {
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55 synchronized (lock_) {
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56 float 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(float assumedValue, float 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 SynchronizedFloat.
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77 * Uses identityHashCode to avoid deadlock when
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78 * two SynchronizedFloats 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 float swap(SynchronizedFloat other) {
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86 if (other == this) return get();
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87 SynchronizedFloat fst = this;
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88 SynchronizedFloat 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 * Add amount to value (i.e., set value += amount)
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104 * @return the new value
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105 **/
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106 public float add(float amount) {
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107 synchronized (lock_) {
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108 return value_ += amount;
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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 * Subtract amount from value (i.e., set value -= amount)
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114 * @return the new value
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115 **/
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116 public float subtract(float amount) {
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117 synchronized (lock_) {
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118 return value_ -= amount;
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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 * Multiply value by factor (i.e., set value *= factor)
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124 * @return the new value
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125 **/
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126 public synchronized float multiply(float factor) {
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127 synchronized (lock_) {
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128 return value_ *= factor;
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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 * Divide value by factor (i.e., set value /= factor)
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134 * @return the new value
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135 **/
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136 public float divide(float factor) {
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137 synchronized (lock_) {
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138 return value_ /= factor;
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139 }
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140 }
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141
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142 public int compareTo(float other) {
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143 float val = get();
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144 return (val < other)? -1 : (val == other)? 0 : 1;
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145 }
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146
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147 public int compareTo(SynchronizedFloat other) {
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148 return compareTo(other.get());
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149 }
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150
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151 public int compareTo(Object other) {
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152 return compareTo((SynchronizedFloat)other);
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153 }
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154
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155 public boolean equals(Object other) {
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156 if (other != null &&
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157 other instanceof SynchronizedFloat)
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158 return get() == ((SynchronizedFloat)other).get();
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159 else
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160 return false;
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161 }
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162
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163 public int hashCode() {
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164 return Float.floatToIntBits(get());
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165 }
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166
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167 public String toString() { return String.valueOf(get()); }
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168
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169 }
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170