Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/SynchronizedBoolean.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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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 & 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 |