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annotate src/EDU/oswego/cs/dl/util/concurrent/Executor.java @ 35:6f68e94c1fb8 default tip

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Add CondensedStats monitoring utility, equivalent to vmstat
author Dominic Cleal <dominic-cleal@cdo2.com>
date Thu, 05 Aug 2010 11:07:25 +0100
parents 3dc0c5604566
children
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1 /*
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2 File: Executor.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 19Jun1998 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 * Interface for objects that execute Runnables,
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18 * as well as various objects that can be wrapped
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19 * as Runnables.
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20 * The main reason to use Executor throughout a program or
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21 * subsystem is to provide flexibility: You can easily
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22 * change from using thread-per-task to using pools or
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23 * queuing, without needing to change most of your code that
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24 * generates tasks.
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25 * <p>
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26 * The general intent is that execution be asynchronous,
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27 * or at least independent of the caller. For example,
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28 * one of the simplest implementations of <code>execute</code>
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29 * (as performed in ThreadedExecutor)
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30 * is <code>new Thread(command).start();</code>.
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31 * However, this interface allows implementations that instead
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32 * employ queueing or pooling, or perform additional
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33 * bookkeeping.
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34 * <p>
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35 *
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36 * <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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37 **/
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38 public interface Executor {
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39 /**
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40 * Execute the given command. This method is guaranteed
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41 * only to arrange for execution, that may actually
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42 * occur sometime later; for example in a new
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43 * thread. However, in fully generic use, callers
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44 * should be prepared for execution to occur in
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45 * any fashion at all, including immediate direct
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46 * execution.
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47 * <p>
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48 * The method is defined not to throw
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49 * any checked exceptions during execution of the command. Generally,
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50 * any problems encountered will be asynchronous and
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51 * so must be dealt with via callbacks or error handler
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52 * objects. If necessary, any context-dependent
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53 * catastrophic errors encountered during
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54 * actions that arrange for execution could be accompanied
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55 * by throwing context-dependent unchecked exceptions.
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56 * <p>
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57 * However, the method does throw InterruptedException:
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58 * It will fail to arrange for execution
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59 * if the current thread is currently interrupted.
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60 * Further, the general contract of the method is to avoid,
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61 * suppress, or abort execution if interruption is detected
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62 * in any controllable context surrounding execution.
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63 **/
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64 public void execute(Runnable command) throws InterruptedException;
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65
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66 }