Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/SynchronizedBoolean.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 /*
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2 File: SynchronizedBoolean.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 boolean 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 SynchronizedBoolean extends SynchronizedVariable implements Comparable, Cloneable {
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23 protected boolean value_;
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24
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25 /**
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26 * Make a new SynchronizedBoolean with the given initial value,
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27 * and using its own internal lock.
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28 **/
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29 public SynchronizedBoolean(boolean initialValue) {
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30 super();
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31 value_ = initialValue;
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32 }
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33
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34 /**
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35 * Make a new SynchronizedBoolean with the given initial value,
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36 * and using the supplied lock.
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37 **/
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38 public SynchronizedBoolean(boolean initialValue, Object lock) {
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39 super(lock);
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40 value_ = initialValue;
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41 }
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42
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43 /**
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44 * Return the current value
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45 **/
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46 public final boolean get() { synchronized(lock_) { return value_; } }
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47
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48 /**
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49 * Set to newValue.
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50 * @return the old value
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51 **/
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52
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53 public boolean set(boolean newValue) {
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54 synchronized (lock_) {
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55 boolean old = value_;
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56 value_ = newValue;
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57 return old;
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58 }
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59 }
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60
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61 /**
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62 * Set value to newValue only if it is currently assumedValue.
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63 * @return true if successful
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64 **/
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65 public boolean commit(boolean assumedValue, boolean newValue) {
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66 synchronized(lock_) {
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67 boolean success = (assumedValue == value_);
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68 if (success) value_ = newValue;
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69 return success;
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70 }
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71 }
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72
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73 /**
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74 * Atomically swap values with another SynchronizedBoolean.
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75 * Uses identityHashCode to avoid deadlock when
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76 * two SynchronizedBooleans attempt to simultaneously swap with each other.
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77 * (Note: Ordering via identyHashCode is not strictly guaranteed
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78 * by the language specification to return unique, orderable
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79 * values, but in practice JVMs rely on them being unique.)
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80 * @return the new value
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81 **/
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82
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83 public boolean swap(SynchronizedBoolean other) {
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84 if (other == this) return get();
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85 SynchronizedBoolean fst = this;
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86 SynchronizedBoolean snd = other;
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87 if (System.identityHashCode(fst) > System.identityHashCode(snd)) {
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88 fst = other;
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89 snd = this;
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90 }
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91 synchronized(fst.lock_) {
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92 synchronized(snd.lock_) {
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93 fst.set(snd.set(fst.get()));
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94 return get();
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95 }
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96 }
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97 }
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98
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99 /**
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100 * Set the value to its complement
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101 * @return the new value
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102 **/
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103 public boolean complement() {
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104 synchronized (lock_) {
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105 value_ = !value_;
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106 return value_;
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107 }
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108 }
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109
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110 /**
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111 * Set value to value &amp; b.
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112 * @return the new value
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113 **/
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114 public boolean and(boolean b) {
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115 synchronized (lock_) {
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116 value_ = value_ & b;
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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 * Set value to value | b.
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123 * @return the new value
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124 **/
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125 public boolean or(boolean b) {
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126 synchronized (lock_) {
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127 value_ = value_ | b;
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128 return value_;
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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 /**
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134 * Set value to value ^ b.
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135 * @return the new value
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136 **/
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137 public boolean xor(boolean b) {
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138 synchronized (lock_) {
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139 value_ = value_ ^ b;
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140 return value_;
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141 }
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142 }
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143
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144
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145 public int compareTo(boolean other) {
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146 boolean val = get();
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147 return (val == other)? 0 : (val)? 1 : -1;
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148 }
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149
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150 public int compareTo(SynchronizedBoolean other) {
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151 return compareTo(other.get());
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152 }
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153
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154 public int compareTo(Object other) {
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155 return compareTo((SynchronizedBoolean)other);
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156 }
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157
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158
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159 public boolean equals(Object other) {
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160 if (other != null &&
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161 other instanceof SynchronizedBoolean)
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162 return get() == ((SynchronizedBoolean)other).get();
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163 else
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164 return false;
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165 }
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166
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167 public int hashCode() {
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168 boolean b = get();
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169 return (b)? 3412688 : 8319343; // entirely arbitrary
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170 }
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171
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172 public String toString() { return String.valueOf(get()); }
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173
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174 }
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175