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annotate src/EDU/oswego/cs/dl/util/concurrent/Takable.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: Takable.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 11Jun1998 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 * This interface exists to enable stricter type checking
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18 * for channels. A method argument or instance variable
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19 * in a consumer object can be declared as only a Takable
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20 * rather than a Channel, in which case a Java compiler
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21 * will disallow put operations.
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22 * <p>
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23 * Full method descriptions appear in the Channel interface.
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24 * <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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25 * @see Channel
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26 * @see Puttable
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27 **/
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29 public interface Takable {
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30
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31 /**
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32 * Return and remove an item from channel,
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33 * possibly waiting indefinitely until
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34 * such an item exists.
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35 * @return some item from the channel. Different implementations
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36 * may guarantee various properties (such as FIFO) about that item
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37 * @exception InterruptedException if the current thread has
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38 * been interrupted at a point at which interruption
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39 * is detected, in which case state of the channel is unchanged.
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40 *
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41 **/
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42 public Object take() throws InterruptedException;
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43
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44
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45 /**
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46 * Return and remove an item from channel only if one is available within
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47 * msecs milliseconds. The time bound is interpreted in a coarse
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48 * grained, best-effort fashion.
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49 * @param msecs the number of milliseconds to wait. If less than
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50 * or equal to zero, the operation does not perform any timed waits,
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51 * but might still require
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52 * access to a synchronization lock, which can impose unbounded
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53 * delay if there is a lot of contention for the channel.
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54 * @return some item, or null if the channel is empty.
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55 * @exception InterruptedException if the current thread has
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56 * been interrupted at a point at which interruption
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57 * is detected, in which case state of the channel is unchanged
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58 * (i.e., equivalent to a false return).
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59 **/
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60
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61 public Object poll(long msecs) throws InterruptedException;
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62
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63 }