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annotate src/EDU/oswego/cs/dl/util/concurrent/LockedExecutor.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: LockedExecutor.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 21Jun1998 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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16 /**
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17 * An implementation of Executor that
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18 * invokes the run method of the supplied command within
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19 * a synchronization lock and then returns.
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20 *
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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 **/
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23 public class LockedExecutor implements Executor {
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24
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25 /** The mutex **/
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26 protected final Sync mutex_;
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27
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28 /**
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29 * Create a new LockedExecutor that relies on the given mutual
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30 * exclusion lock.
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31 * @param mutex Any mutual exclusion lock.
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32 * Standard usage is to supply an instance of <code>Mutex</code>,
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33 * but, for example, a Semaphore initialized to 1 also works.
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34 * On the other hand, many other Sync implementations would not
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35 * work here, so some care is required to supply a sensible
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36 * synchronization object.
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37 **/
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38
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39 public LockedExecutor(Sync mutex) {
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40 mutex_ = mutex;
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41 }
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42
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43 /**
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44 * Execute the given command directly in the current thread,
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45 * within the supplied lock.
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46 **/
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47 public void execute(Runnable command) throws InterruptedException {
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48 mutex_.acquire();
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49 try {
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50 command.run();
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51 }
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52 finally {
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53 mutex_.release();
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54 }
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55 }
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57 }