Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/SynchronizedInt.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: SynchronizedInt.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 int 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 SynchronizedInt extends SynchronizedVariable implements Comparable, Cloneable { |
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23 |
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24 protected int value_; |
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25 |
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26 /** |
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27 * Make a new SynchronizedInt 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 SynchronizedInt(int 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 SynchronizedInt 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 SynchronizedInt(int 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 int 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 int set(int newValue) { |
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55 synchronized (lock_) { |
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56 int 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(int assumedValue, int 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 SynchronizedInt. |
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76 * Uses identityHashCode to avoid deadlock when |
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77 * two SynchronizedInts attempt to simultaneously swap with each other. |
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78 * (Note: Ordering via identyHashCode is not strictly guaranteed |
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79 * by the language specification to return unique, orderable |
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80 * values, but in practice JVMs rely on them being unique.) |
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81 * @return the new value |
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82 **/ |
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83 |
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84 public int swap(SynchronizedInt other) { |
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85 if (other == this) return get(); |
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86 SynchronizedInt fst = this; |
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87 SynchronizedInt snd = other; |
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88 if (System.identityHashCode(fst) > System.identityHashCode(snd)) { |
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89 fst = other; |
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90 snd = this; |
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91 } |
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92 synchronized(fst.lock_) { |
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93 synchronized(snd.lock_) { |
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94 fst.set(snd.set(fst.get())); |
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95 return get(); |
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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 /** |
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101 * Increment the value. |
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102 * @return the new value |
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103 **/ |
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104 public int increment() { |
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105 synchronized (lock_) { |
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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 * Decrement the value. |
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112 * @return the new value |
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113 **/ |
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114 public int decrement() { |
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115 synchronized (lock_) { |
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116 return --value_; |
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117 } |
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118 } |
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119 |
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120 /** |
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121 * Add amount to value (i.e., set value += amount) |
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122 * @return the new value |
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123 **/ |
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124 public int add(int amount) { |
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125 synchronized (lock_) { |
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126 return value_ += amount; |
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127 } |
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128 } |
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129 |
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130 /** |
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131 * Subtract amount from value (i.e., set value -= amount) |
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132 * @return the new value |
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133 **/ |
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134 public int subtract(int amount) { |
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135 synchronized (lock_) { |
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136 return value_ -= amount; |
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137 } |
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138 } |
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139 |
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140 /** |
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141 * Multiply value by factor (i.e., set value *= factor) |
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142 * @return the new value |
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143 **/ |
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144 public synchronized int multiply(int factor) { |
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145 synchronized (lock_) { |
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146 return value_ *= factor; |
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147 } |
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148 } |
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149 |
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150 /** |
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151 * Divide value by factor (i.e., set value /= factor) |
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152 * @return the new value |
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153 **/ |
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154 public int divide(int factor) { |
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155 synchronized (lock_) { |
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156 return value_ /= factor; |
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157 } |
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158 } |
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159 |
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160 /** |
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161 * Set the value to the negative of its old value |
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162 * @return the new value |
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163 **/ |
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164 public int negate() { |
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165 synchronized (lock_) { |
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166 value_ = -value_; |
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167 return value_; |
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168 } |
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169 } |
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170 |
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171 /** |
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172 * Set the value to its complement |
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173 * @return the new value |
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174 **/ |
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175 public int complement() { |
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176 synchronized (lock_) { |
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177 value_ = ~value_; |
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178 return value_; |
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179 } |
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180 } |
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181 |
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182 /** |
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183 * Set value to value & b. |
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184 * @return the new value |
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185 **/ |
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186 public int and(int b) { |
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187 synchronized (lock_) { |
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188 value_ = value_ & b; |
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189 return value_; |
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190 } |
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191 } |
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192 |
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193 /** |
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194 * Set value to value | b. |
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195 * @return the new value |
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196 **/ |
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197 public int or(int b) { |
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198 synchronized (lock_) { |
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199 value_ = value_ | b; |
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200 return value_; |
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201 } |
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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 * Set value to value ^ b. |
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207 * @return the new value |
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208 **/ |
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209 public int xor(int b) { |
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210 synchronized (lock_) { |
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211 value_ = value_ ^ b; |
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212 return value_; |
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213 } |
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214 } |
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215 |
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216 public int compareTo(int other) { |
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217 int val = get(); |
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218 return (val < other)? -1 : (val == other)? 0 : 1; |
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219 } |
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220 |
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221 public int compareTo(SynchronizedInt other) { |
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222 return compareTo(other.get()); |
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223 } |
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224 |
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225 public int compareTo(Object other) { |
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226 return compareTo((SynchronizedInt)other); |
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227 } |
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228 |
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229 public boolean equals(Object other) { |
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230 if (other != null && |
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231 other instanceof SynchronizedInt) |
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232 return get() == ((SynchronizedInt)other).get(); |
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233 else |
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234 return false; |
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235 } |
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236 |
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237 public int hashCode() { return get(); } |
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238 |
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239 public String toString() { return String.valueOf(get()); } |
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240 |
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241 } |
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242 |