Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/SyncCollection.java @ 28:4b2f23b6feca
Add a schema compatibility check to indexer that parallels storage.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:11:15 +0100 |
parents | 3dc0c5604566 |
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0
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1 /* |
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2 File: SyncCollection.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 * SyncCollections wrap Sync-based control around java.util.Collections. |
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19 * They are similar in operation to those provided |
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20 * by java.util.Collection.synchronizedCollection, but have |
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21 * several extended capabilities. |
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22 * <p> |
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23 * The Collection interface is conceptually broken into two |
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24 * parts for purposes of synchronization control. The purely inspective |
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25 * reader operations are: |
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26 * <ul> |
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27 * <li> size |
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28 * <li> isEmpty |
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29 * <li> toArray |
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30 * <li> contains |
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31 * <li> containsAll |
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32 * <li> iterator |
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33 * </ul> |
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34 * The possibly mutative writer operations (which are also |
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35 * the set of operations that are allowed to throw |
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36 * UnsupportedOperationException) are: |
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37 * <ul> |
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38 * <li> add |
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39 * <li> addAll |
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40 * <li> remove |
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41 * <li> clear |
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42 * <li> removeAll |
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43 * <li> retainAll |
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44 * </ul> |
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45 * |
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46 * <p> |
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47 * SyncCollections can be used with either Syncs or ReadWriteLocks. |
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48 * When used with |
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49 * single Syncs, the same lock is used as both the reader and writer lock. |
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50 * The SyncCollection class cannot itself guarantee that using |
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51 * a pair of read/write locks will always correctly protect objects, since |
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52 * Collection implementations are not precluded from internally |
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53 * performing hidden unprotected state changes within conceptually read-only |
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54 * operations. However, they do work with current java.util implementations. |
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55 * (Hopefully, implementations that do not provide this natural |
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56 * guarantee will be clearly documentented as such.) |
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57 * <p> |
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58 * This class provides a straight implementation of Collections interface. |
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59 * In order to conform to this interface, sync failures |
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60 * due to interruption do NOT result in InterruptedExceptions. |
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61 * Instead, upon detection of interruption, |
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62 * <ul> |
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63 * <li> All mutative operations convert the interruption to |
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64 * an UnsupportedOperationException, while also propagating |
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65 * the interrupt status of the thread. Thus, unlike normal |
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66 * java.util.Collections, SyncCollections can <em>transiently</em> |
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67 * behave as if mutative operations are not supported. |
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68 * <li> All read-only operations |
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69 * attempt to return a result even upon interruption. In some contexts, |
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70 * such results will be meaningless due to interference, but |
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71 * provide best-effort status indications that can be useful during |
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72 * recovery. The cumulative number of synchronization failures encountered |
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73 * during such operations is accessible using method |
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74 * <code>synchronizationFailures()</code>. |
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75 * Non-zero values may indicate serious program errors. |
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76 * </ul> |
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77 * <p> |
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78 * The iterator() method returns a SyncCollectionIterator with |
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79 * properties and methods that are analogous to those of SyncCollection |
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80 * itself: hasNext and next are read-only, and remove is mutative. |
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81 * These methods allow fine-grained controlled access, but do <em>NOT</em> |
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82 * preclude concurrent modifications from being interleaved with traversals, |
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83 * which may lead to ConcurrentModificationExceptions. |
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84 * However, the class also supports method <code>unprotectedIterator</code> |
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85 * that can be used in conjunction with the <code>readerSync</code> or |
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86 * <code>writerSync</code> methods to perform locked traversals. For example, |
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87 * to protect a block of reads: |
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88 * <pre> |
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89 * Sync lock = coll.readerSync(); |
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90 * try { |
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91 * lock.acquire(); |
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92 * try { |
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93 * Iterator it = coll.unprotectedIterator(); |
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94 * while (it.hasNext()) |
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95 * System.out.println(it.next()); |
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96 * } |
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97 * finally { |
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98 * lock.release(); |
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99 * } |
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100 * } |
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101 * catch (InterruptedException ex) { ... } |
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102 * </pre> |
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103 * If you need to protect blocks of writes, you must use some |
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104 * form of <em>reentrant</em> lock (for example <code>ReentrantLock</code> |
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105 * or <code>ReentrantWriterPreferenceReadWriteLock</code>) as the Sync |
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106 * for the collection in order to allow mutative methods to proceed |
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107 * while the current thread holds the lock. For example, you might |
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108 * need to hold a write lock during an initialization sequence: |
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109 * <pre> |
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110 * Collection c = new SyncCollection(new ArrayList(), |
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111 * new ReentrantWriterPreferenceReadWriteLock()); |
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112 * // ... |
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113 * c.writeLock().acquire(); |
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114 * try { |
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115 * for (...) { |
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116 * Object x = someStream.readObject(); |
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117 * c.add(x); // would block if writeLock not reentrant |
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118 * } |
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119 * } |
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120 * catch (IOException iox) { |
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121 * ... |
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122 * } |
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123 * finally { |
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124 * c.writeLock().release(); |
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125 * } |
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126 * catch (InterruptedException ex) { ... } |
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127 * </pre> |
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128 * <p> |
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129 * (It would normally be better practice here to not make the |
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130 * collection accessible until initialization is complete.) |
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131 * <p> |
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132 * This class does not specifically support use of |
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133 * timed synchronization through the attempt method. However, |
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134 * you can obtain this effect via |
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135 * the TimeoutSync class. For example: |
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136 * <pre> |
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137 * Mutex lock = new Mutex(); |
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138 * TimeoutSync timedLock = new TimeoutSync(lock, 1000); // 1 sec timeouts |
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139 * Collection c = new SyncCollection(new HashSet(), timedlock); |
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140 * </pre> |
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141 * <p> |
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142 * The same can be done with read-write locks: |
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143 * <pre> |
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144 * ReadWriteLock rwl = new WriterPreferenceReadWriteLock(); |
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145 * Sync rlock = new TimeoutSync(rwl.readLock(), 100); |
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146 * Sync wlock = new TimeoutSync(rwl.writeLock(), 100); |
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147 * Collection c = new SyncCollection(new HashSet(), rlock, wlock); |
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148 * </pre> |
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149 * <p> |
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150 * In addition to synchronization control, SyncCollections |
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151 * may be useful in any context requiring before/after methods |
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152 * surrounding collections. For example, you can use ObservableSync |
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153 * to arrange notifications on method calls to collections, as in: |
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154 * <pre> |
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155 * class X { |
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156 * Collection c; |
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157 * |
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158 * static class CollectionObserver implements ObservableSync.SyncObserver { |
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159 * public void onAcquire(Object arg) { |
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160 * Collection coll = (Collection) arg; |
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161 * System.out.println("Starting operation on" + coll); |
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162 * // Other plausible responses include performing integrity |
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163 * // checks on the collection, updating displays, etc |
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164 * } |
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165 * public void onRelease(Object arg) { |
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166 * Collection coll = (Collection) arg; |
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167 * System.out.println("Finished operation on" + coll); |
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168 * } |
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169 * } |
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170 * |
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171 * X() { |
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172 * ObservableSync s = new ObservableSync(); |
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173 * c = new SyncCollection(new HashSet(), s); |
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174 * s.setNotificationArgument(c); |
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175 * CollectionObserver obs = new CollectionObserver(); |
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176 * s.attach(obs); |
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177 * } |
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178 * ... |
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179 * } |
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180 * </pre> |
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181 * |
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182 * <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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183 * @see LayeredSync |
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184 * @see TimeoutSync |
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185 **/ |
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186 |
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187 |
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188 public class SyncCollection implements Collection { |
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189 protected final Collection c_; // Backing Collection |
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190 protected final Sync rd_; // sync for read-only methods |
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191 protected final Sync wr_; // sync for mutative methods |
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192 |
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193 protected final SynchronizedLong syncFailures_ = new SynchronizedLong(0); |
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194 |
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195 /** |
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196 * Create a new SyncCollection protecting the given collection, |
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197 * and using the given sync to control both reader and writer methods. |
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198 * Common, reasonable choices for the sync argument include |
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199 * Mutex, ReentrantLock, and Semaphores initialized to 1. |
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200 * <p> |
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201 * <b>Sample Usage</b> |
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202 * <pre> |
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203 * Collection c = new SyncCollection(new ArrayList(), new Mutex()); |
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204 * </pre> |
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205 **/ |
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206 public SyncCollection(Collection collection, Sync sync) { |
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207 this (collection, sync, sync); |
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208 } |
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209 |
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210 |
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211 /** |
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212 * Create a new SyncCollection protecting the given collection, |
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213 * and using the given ReadWriteLock to control reader and writer methods. |
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214 * <p> |
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215 * <b>Sample Usage</b> |
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216 * <pre> |
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217 * Collection c = new SyncCollection(new HashSet(), |
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218 * new WriterPreferenceReadWriteLock()); |
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219 * </pre> |
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220 **/ |
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221 public SyncCollection(Collection collection, ReadWriteLock rwl) { |
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222 this (collection, rwl.readLock(), rwl.writeLock()); |
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223 } |
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224 |
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225 /** |
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226 * Create a new SyncCollection protecting the given collection, |
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227 * and using the given pair of locks to control reader and writer methods. |
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228 **/ |
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229 public SyncCollection(Collection collection, Sync readLock, Sync writeLock) { |
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230 c_ = collection; |
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231 rd_ = readLock; |
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232 wr_ = writeLock; |
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233 } |
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234 |
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235 /** |
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236 * Return the Sync object managing read-only operations |
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237 **/ |
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238 |
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239 public Sync readerSync() { |
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240 return rd_; |
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241 } |
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242 |
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243 /** |
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244 * Return the Sync object managing mutative operations |
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245 **/ |
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246 |
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247 public Sync writerSync() { |
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248 return wr_; |
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249 } |
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250 |
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251 /** |
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252 * Return the number of synchronization failures for read-only operations |
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253 **/ |
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254 public long syncFailures() { |
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255 return syncFailures_.get(); |
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256 } |
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257 |
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258 |
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259 /** Try to acquire sync before a reader operation; record failure **/ |
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260 protected boolean beforeRead() { |
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261 try { |
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262 rd_.acquire(); |
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263 return false; |
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264 } |
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265 catch (InterruptedException ex) { |
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266 syncFailures_.increment(); |
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267 return true; |
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268 } |
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269 } |
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270 |
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271 /** Clean up after a reader operation **/ |
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272 protected void afterRead(boolean wasInterrupted) { |
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273 if (wasInterrupted) { |
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274 Thread.currentThread().interrupt(); |
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275 } |
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276 else |
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277 rd_.release(); |
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278 } |
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279 |
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280 |
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281 |
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282 public int size() { |
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283 boolean wasInterrupted = beforeRead(); |
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284 try { |
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285 return c_.size(); |
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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 public boolean isEmpty() { |
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293 boolean wasInterrupted = beforeRead(); |
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294 try { |
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295 return c_.isEmpty(); |
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296 } |
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297 finally { |
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298 afterRead(wasInterrupted); |
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299 } |
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300 } |
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301 |
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302 public boolean contains(Object o) { |
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303 boolean wasInterrupted = beforeRead(); |
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304 try { |
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305 return c_.contains(o); |
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306 } |
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307 finally { |
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308 afterRead(wasInterrupted); |
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309 } |
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310 } |
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311 |
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312 public Object[] toArray() { |
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313 boolean wasInterrupted = beforeRead(); |
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314 try { |
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315 return c_.toArray(); |
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316 } |
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317 finally { |
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318 afterRead(wasInterrupted); |
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319 } |
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320 } |
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321 |
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322 public Object[] toArray(Object[] a) { |
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323 boolean wasInterrupted = beforeRead(); |
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324 try { |
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325 return c_.toArray(a); |
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326 } |
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327 finally { |
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328 afterRead(wasInterrupted); |
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329 } |
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330 } |
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331 |
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332 public boolean containsAll(Collection coll) { |
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333 boolean wasInterrupted = beforeRead(); |
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334 try { |
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335 return c_.containsAll(coll); |
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336 } |
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337 finally { |
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338 afterRead(wasInterrupted); |
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339 } |
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340 } |
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341 |
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342 |
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343 public boolean add(Object o) { |
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344 try { |
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345 wr_.acquire(); |
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346 try { |
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347 return c_.add(o); |
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348 } |
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349 finally { |
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350 wr_.release(); |
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351 } |
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352 } |
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353 catch (InterruptedException ex) { |
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354 Thread.currentThread().interrupt(); |
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355 throw new UnsupportedOperationException(); |
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356 } |
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357 } |
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358 |
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359 public boolean remove(Object o) { |
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360 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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|
361 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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|
362 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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|
363 return c_.remove(o); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
364 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
365 finally { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
366 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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|
367 } |
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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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|
368 } |
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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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|
369 catch (InterruptedException ex) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
370 Thread.currentThread().interrupt(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
371 throw new UnsupportedOperationException(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
372 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
373 } |
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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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|
374 |
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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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|
375 public boolean addAll(Collection 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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|
376 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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|
377 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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|
378 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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|
379 return c_.addAll(coll); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
380 } |
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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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|
381 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
|
382 wr_.release(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
383 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
384 } |
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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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|
385 catch (InterruptedException ex) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
386 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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|
387 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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|
388 } |
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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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|
389 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
390 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
391 public boolean removeAll(Collection 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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392 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
|
393 wr_.acquire(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
394 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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|
395 return c_.removeAll(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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|
396 } |
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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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|
397 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
|
398 wr_.release(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
399 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
400 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
401 catch (InterruptedException ex) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
402 Thread.currentThread().interrupt(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
403 throw new UnsupportedOperationException(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
404 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
405 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
406 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
407 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
408 public boolean retainAll(Collection 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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|
409 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
410 wr_.acquire(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
411 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
412 return c_.retainAll(coll); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
413 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
414 finally { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
415 wr_.release(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
416 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
417 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
418 catch (InterruptedException ex) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
419 Thread.currentThread().interrupt(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
420 throw new UnsupportedOperationException(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
421 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
422 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
423 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
424 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
425 public void clear() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
426 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
427 wr_.acquire(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
428 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
429 c_.clear(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
430 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
431 finally { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
432 wr_.release(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
433 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
434 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
435 catch (InterruptedException ex) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
436 Thread.currentThread().interrupt(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
437 throw new UnsupportedOperationException(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
438 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
439 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
440 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
441 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
442 /** Return the base iterator of the underlying collection **/ |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
443 public Iterator unprotectedIterator() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
444 boolean wasInterrupted = beforeRead(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
445 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
446 return c_.iterator(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
447 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
448 finally { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
449 afterRead(wasInterrupted); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
450 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
451 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
452 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
453 public Iterator iterator() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
454 boolean wasInterrupted = beforeRead(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
455 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
456 return new SyncCollectionIterator(c_.iterator()); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
457 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
458 finally { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
459 afterRead(wasInterrupted); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
460 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
461 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
462 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
463 public class SyncCollectionIterator implements Iterator { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
464 protected final Iterator baseIterator_; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
465 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
466 SyncCollectionIterator(Iterator baseIterator) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
467 baseIterator_ = baseIterator; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
468 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
469 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
470 public boolean hasNext() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
471 boolean wasInterrupted = beforeRead(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
472 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
473 return baseIterator_.hasNext(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
474 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
475 finally { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
476 afterRead(wasInterrupted); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
477 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
478 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
479 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
480 public Object next() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
481 boolean wasInterrupted = beforeRead(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
482 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
483 return baseIterator_.next(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
484 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
485 finally { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
486 afterRead(wasInterrupted); |
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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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487 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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488 } |
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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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489 |
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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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490 public void remove() { |
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491 try { |
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492 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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493 try { |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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494 baseIterator_.remove(); |
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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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495 } |
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parents:
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496 finally { |
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497 wr_.release(); |
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parents:
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498 } |
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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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499 } |
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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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500 catch (InterruptedException ex) { |
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501 Thread.currentThread().interrupt(); |
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502 throw new UnsupportedOperationException(); |
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parents:
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503 } |
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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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504 } |
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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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505 |
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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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506 } |
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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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507 } |
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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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508 |
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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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509 |