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annotate src/EDU/oswego/cs/dl/util/concurrent/TimeoutSync.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: 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 }