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annotate src/EDU/oswego/cs/dl/util/concurrent/TimedCallable.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 TimedCallable.java
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3
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4 Originally written by Joseph Bowbeer 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
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7 Originally part of jozart.swingutils.
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8 Adapted by Doug Lea for util.concurrent.
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9
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10 History:
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11 Date Who What
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12 11dec1999 dl Adapted for util.concurrent
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13
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14 */
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16 package EDU.oswego.cs.dl.util.concurrent;
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17
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18 /**
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19 * TimedCallable runs a Callable function for a given length of time.
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20 * The function is run in its own thread. If the function completes
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21 * in time, its result is returned; otherwise the thread is interrupted
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22 * and an InterruptedException is thrown.
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23 * <p>
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24 * Note: TimedCallable will always return within the given time limit
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25 * (modulo timer inaccuracies), but whether or not the worker thread
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26 * stops in a timely fashion depends on the interrupt handling in the
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27 * Callable function's implementation.
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28 *
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29 * @author Joseph Bowbeer
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30 * @version 1.0
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31 *
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32 * <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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33
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34 */
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35
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36 public class TimedCallable extends ThreadFactoryUser implements Callable {
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37
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38 private final Callable function;
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39 private final long millis;
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40
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41 public TimedCallable(Callable function, long millis) {
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42 this.function = function;
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43 this.millis = millis;
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44 }
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45
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46 public Object call() throws Exception {
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47
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48 FutureResult result = new FutureResult();
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49
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50 Thread thread = getThreadFactory().newThread(result.setter(function));
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51
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52 thread.start();
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53
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54 try {
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55 return result.timedGet(millis);
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56 }
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57 catch (InterruptedException ex) {
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58 /* Stop thread if we were interrupted or timed-out
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59 while waiting for the result. */
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60 thread.interrupt();
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61 throw ex;
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62 }
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63 }
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64 }