Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/SyncSet.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: 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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25 |
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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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73 |
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74 } |
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75 |
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76 |