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annotate src/EDU/oswego/cs/dl/util/concurrent/SyncSet.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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1 /*
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2 File: SyncSet.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 * SyncSets wrap Sync-based control around java.util.Sets.
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19 * They support two additional reader operations than do
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20 * SyncCollection: hashCode and equals.
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21 * <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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22 * @see SyncCollection
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23 **/
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24
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26 public class SyncSet extends SyncCollection implements Set {
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27
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28 /**
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29 * Create a new SyncSet protecting the given collection,
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30 * and using the given sync to control both reader and writer methods.
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31 * Common, reasonable choices for the sync argument include
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32 * Mutex, ReentrantLock, and Semaphores initialized to 1.
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33 **/
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34 public SyncSet(Set set, Sync sync) {
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35 super (set, sync);
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36 }
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37
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38 /**
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39 * Create a new SyncSet protecting the given set,
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40 * and using the given ReadWriteLock to control reader and writer methods.
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41 **/
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42 public SyncSet(Set set, ReadWriteLock rwl) {
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43 super (set, rwl.readLock(), rwl.writeLock());
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44 }
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45
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46 /**
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47 * Create a new SyncSet protecting the given set,
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48 * and using the given pair of locks to control reader and writer methods.
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49 **/
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50 public SyncSet(Set set, Sync readLock, Sync writeLock) {
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51 super(set, readLock, writeLock);
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52 }
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53
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54 public int hashCode() {
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55 boolean wasInterrupted = beforeRead();
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56 try {
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57 return c_.hashCode();
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58 }
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59 finally {
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60 afterRead(wasInterrupted);
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61 }
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62 }
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63
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64 public boolean equals(Object o) {
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65 boolean wasInterrupted = beforeRead();
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66 try {
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67 return c_.equals(o);
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68 }
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69 finally {
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70 afterRead(wasInterrupted);
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71 }
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72 }
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74 }
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