Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/TimeoutSync.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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1 /* |
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2 File: TimeoutSync.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 |
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16 /** |
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17 * A TimeoutSync is an adaptor class that transforms all |
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18 * calls to acquire to instead invoke attempt with a predetermined |
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19 * timeout value. |
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20 *<p> |
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21 * <b>Sample Usage</b>. A TimeoutSync can be used to obtain |
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22 * Timeouts for locks used in SyncCollections. For example: |
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23 * <pre> |
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24 * Mutex lock = new Mutex(); |
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25 * TimeoutSync timedLock = new TimeoutSync(lock, 1000); // 1 sec timeouts |
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26 * Set set = new SyncSet(new HashSet(), timedlock); |
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27 * try { |
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28 * set. add("hi"); |
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29 * } |
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30 * // SyncSets translate timeouts and other lock failures |
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31 * // to unsupported operation exceptions, |
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32 * catch (UnsupportedOperationException ex) { |
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33 * System.out.println("Lock failure"); |
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34 * } |
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35 * </pre> |
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36 * |
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37 * <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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38 * @see Sync |
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39 **/ |
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40 |
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41 |
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42 public class TimeoutSync implements Sync { |
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43 |
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44 protected final Sync sync_; // the adapted sync |
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45 protected final long timeout_; // timeout value |
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46 |
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47 /** |
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48 * Create a TimeoutSync using the given Sync object, and |
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49 * using the given timeout value for all calls to acquire. |
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50 **/ |
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51 |
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52 public TimeoutSync(Sync sync, long timeout) { |
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53 sync_ = sync; |
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54 timeout_ = timeout; |
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55 } |
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56 |
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57 public void acquire() throws InterruptedException { |
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58 if (!sync_.attempt(timeout_)) throw new TimeoutException(timeout_); |
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59 } |
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60 |
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61 public boolean attempt(long msecs) throws InterruptedException { |
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62 return sync_.attempt(msecs); |
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63 } |
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64 |
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65 public void release() { |
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66 sync_.release(); |
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67 } |
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68 |
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69 } |