Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/SyncMap.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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1 /* |
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2 File: SyncMap.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 1Aug1998 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 import java.util.*; |
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16 |
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17 /** |
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18 * SyncMaps wrap Sync-based control around java.util.Maps. |
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19 * They operate in the same way as SyncCollection. |
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20 * <p> |
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21 * Reader operations are |
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22 * <ul> |
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23 * <li> size |
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24 * <li> isEmpty |
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25 * <li> get |
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26 * <li> containsKey |
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27 * <li> containsValue |
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28 * <li> keySet |
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29 * <li> entrySet |
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30 * <li> values |
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31 * </ul> |
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32 * Writer operations are: |
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33 * <ul> |
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34 * <li> put |
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35 * <li> putAll |
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36 * <li> remove |
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37 * <li> clear |
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38 * </ul> |
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39 * |
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40 * <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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41 * @see SyncCollection |
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42 **/ |
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43 |
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44 |
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45 public class SyncMap implements Map { |
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46 protected final Map c_; // Backing Map |
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47 protected final Sync rd_; // sync for read-only methods |
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48 protected final Sync wr_; // sync for mutative methods |
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49 |
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50 protected final SynchronizedLong syncFailures_ = new SynchronizedLong(0); |
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51 |
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52 /** |
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53 * Create a new SyncMap protecting the given map, |
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54 * and using the given sync to control both reader and writer methods. |
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55 * Common, reasonable choices for the sync argument include |
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56 * Mutex, ReentrantLock, and Semaphores initialized to 1. |
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57 **/ |
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58 public SyncMap(Map map, Sync sync) { |
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59 this (map, sync, sync); |
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60 } |
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61 |
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62 |
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63 /** |
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64 * Create a new SyncMap protecting the given map, |
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65 * and using the given ReadWriteLock to control reader and writer methods. |
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66 **/ |
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67 public SyncMap(Map map, ReadWriteLock rwl) { |
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68 this (map, rwl.readLock(), rwl.writeLock()); |
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69 } |
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70 |
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71 /** |
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72 * Create a new SyncMap protecting the given map, |
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73 * and using the given pair of locks to control reader and writer methods. |
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74 **/ |
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75 public SyncMap(Map map, Sync readLock, Sync writeLock) { |
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76 c_ = map; |
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77 rd_ = readLock; |
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78 wr_ = writeLock; |
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79 } |
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80 |
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81 /** |
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82 * Return the Sync object managing read-only operations |
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83 **/ |
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84 |
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85 public Sync readerSync() { |
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86 return rd_; |
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87 } |
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88 |
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89 /** |
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90 * Return the Sync object managing mutative operations |
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91 **/ |
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92 |
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93 public Sync writerSync() { |
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94 return wr_; |
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95 } |
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96 |
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97 /** |
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98 * Return the number of synchronization failures for read-only operations |
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99 **/ |
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100 public long syncFailures() { |
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101 return syncFailures_.get(); |
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102 } |
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103 |
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104 |
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105 /** Try to acquire sync before a reader operation; record failure **/ |
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106 protected boolean beforeRead() { |
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107 try { |
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108 rd_.acquire(); |
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109 return false; |
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110 } |
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111 catch (InterruptedException ex) { |
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112 syncFailures_.increment(); |
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113 return true; |
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114 } |
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115 } |
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116 |
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117 /** Clean up after a reader operation **/ |
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118 protected void afterRead(boolean wasInterrupted) { |
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119 if (wasInterrupted) { |
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120 Thread.currentThread().interrupt(); |
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121 } |
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122 else |
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123 rd_.release(); |
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124 } |
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125 |
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126 |
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127 |
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128 public int hashCode() { |
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129 boolean wasInterrupted = beforeRead(); |
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130 try { |
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131 return c_.hashCode(); |
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132 } |
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133 finally { |
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134 afterRead(wasInterrupted); |
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135 } |
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136 } |
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137 |
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138 public boolean equals(Object o) { |
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139 boolean wasInterrupted = beforeRead(); |
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140 try { |
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141 return c_.equals(o); |
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142 } |
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143 finally { |
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144 afterRead(wasInterrupted); |
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145 } |
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146 } |
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147 |
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148 public int size() { |
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149 boolean wasInterrupted = beforeRead(); |
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150 try { |
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151 return c_.size(); |
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152 } |
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153 finally { |
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154 afterRead(wasInterrupted); |
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155 } |
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156 } |
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157 |
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158 public boolean isEmpty() { |
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159 boolean wasInterrupted = beforeRead(); |
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160 try { |
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161 return c_.isEmpty(); |
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162 } |
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163 finally { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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164 afterRead(wasInterrupted); |
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165 } |
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166 } |
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167 |
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168 public boolean containsKey(Object o) { |
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169 boolean wasInterrupted = beforeRead(); |
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170 try { |
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171 return c_.containsKey(o); |
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172 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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173 finally { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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174 afterRead(wasInterrupted); |
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175 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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176 } |
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177 |
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178 public boolean containsValue(Object o) { |
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179 boolean wasInterrupted = beforeRead(); |
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180 try { |
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181 return c_.containsValue(o); |
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182 } |
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183 finally { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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184 afterRead(wasInterrupted); |
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185 } |
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186 } |
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187 |
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188 public Object get(Object key) { |
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189 boolean wasInterrupted = beforeRead(); |
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190 try { |
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191 return c_.get(key); |
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192 } |
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193 finally { |
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194 afterRead(wasInterrupted); |
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195 } |
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196 } |
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197 |
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198 |
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199 public Object put(Object key, Object value) { |
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200 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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201 wr_.acquire(); |
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202 try { |
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203 return c_.put(key, value); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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204 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
205 finally { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
206 wr_.release(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
207 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
208 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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209 catch (InterruptedException ex) { |
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210 Thread.currentThread().interrupt(); |
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211 throw new UnsupportedOperationException(); |
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parents:
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212 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
213 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
214 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
215 public Object remove(Object key) { |
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216 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
217 wr_.acquire(); |
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parents:
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|
218 try { |
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219 return c_.remove(key); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
220 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
221 finally { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
222 wr_.release(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
223 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
224 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
225 catch (InterruptedException ex) { |
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|
226 Thread.currentThread().interrupt(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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227 throw new UnsupportedOperationException(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
228 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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229 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
230 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
231 public void putAll(Map coll) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
232 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
233 wr_.acquire(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
234 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
235 c_.putAll(coll); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
236 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
237 finally { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
238 wr_.release(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
239 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
240 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
241 catch (InterruptedException ex) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
242 Thread.currentThread().interrupt(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
243 throw new UnsupportedOperationException(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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244 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
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245 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
246 |
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247 |
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248 public void clear() { |
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249 try { |
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250 wr_.acquire(); |
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251 try { |
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252 c_.clear(); |
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253 } |
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254 finally { |
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255 wr_.release(); |
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256 } |
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257 } |
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258 catch (InterruptedException ex) { |
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259 Thread.currentThread().interrupt(); |
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260 throw new UnsupportedOperationException(); |
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261 } |
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262 } |
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263 |
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264 private transient Set keySet_ = null; |
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265 private transient Set entrySet_ = null; |
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266 private transient Collection values_ = null; |
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267 |
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268 public Set keySet() { |
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269 boolean wasInterrupted = beforeRead(); |
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270 try { |
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271 if (keySet_ == null) |
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272 keySet_ = new SyncSet(c_.keySet(), rd_, wr_); |
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273 return keySet_; |
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274 } |
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275 finally { |
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276 afterRead(wasInterrupted); |
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277 } |
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278 } |
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279 |
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280 public Set entrySet() { |
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281 boolean wasInterrupted = beforeRead(); |
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282 try { |
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283 if (entrySet_ == null) |
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284 entrySet_ = new SyncSet(c_.entrySet(), rd_, wr_); |
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285 return entrySet_; |
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286 } |
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287 finally { |
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288 afterRead(wasInterrupted); |
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289 } |
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290 } |
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291 |
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292 |
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293 public Collection values() { |
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294 boolean wasInterrupted = beforeRead(); |
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295 try { |
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296 if (values_ == null) |
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297 values_ = new SyncCollection(c_.values(), rd_, wr_); |
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298 return values_; |
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299 } |
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300 finally { |
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301 afterRead(wasInterrupted); |
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302 } |
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303 } |
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304 |
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305 } |
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306 |
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307 |