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annotate src/EDU/oswego/cs/dl/util/concurrent/WaitableRef.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: WaitableRef.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 * A class useful for offloading synch for Object reference instance variables.
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18 *
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19 * <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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20 **/
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21
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22 public class WaitableRef extends SynchronizedRef {
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23
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24 /**
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25 * Create a WaitableRef initially holding the given reference
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26 * and using its own internal lock.
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27 **/
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28 public WaitableRef(Object initialValue) {
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29 super(initialValue);
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30 }
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31
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32 /**
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33 * Make a new WaitableRef with the given initial value,
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34 * and using the supplied lock.
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35 **/
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36 public WaitableRef(Object initialValue, Object lock) {
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37 super(initialValue, lock);
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38 }
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39
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40 public Object set(Object newValue) {
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41 synchronized (lock_) {
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42 lock_.notifyAll();
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43 return super.set(newValue);
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44 }
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45 }
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46
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47 public boolean commit(Object assumedValue, Object newValue) {
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48 synchronized (lock_) {
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49 boolean success = super.commit(assumedValue, newValue);
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50 if (success) lock_.notifyAll();
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51 return success;
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52 }
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53 }
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54
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55 /**
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56 * Wait until value is null, then run action if nonnull.
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57 * The action is run with the synchronization lock held.
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58 **/
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59
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60 public void whenNull(Runnable action) throws InterruptedException {
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61 synchronized (lock_) {
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62 while (value_ != null) lock_.wait();
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63 if (action != null) action.run();
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64 }
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65 }
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66
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67 /**
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68 * wait until value is nonnull, then run action if nonnull.
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69 * The action is run with the synchronization lock held.
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70 **/
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71 public void whenNotNull(Runnable action) throws InterruptedException {
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72 synchronized (lock_) {
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73 while (value_ == null) lock_.wait();
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74 if (action != null) action.run();
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75 }
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76 }
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77
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78 /**
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79 * Wait until value equals c, then run action if nonnull.
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80 * The action is run with the synchronization lock held.
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81 **/
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82
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83 public void whenEqual(Object c, Runnable action) throws InterruptedException {
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84 synchronized (lock_) {
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85 while (!(value_ == c)) lock_.wait();
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86 if (action != null) action.run();
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87 }
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88 }
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89
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90 /**
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91 * wait until value not equal to c, then run action if nonnull.
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92 * The action is run with the synchronization lock held.
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93 **/
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94 public void whenNotEqual(Object c, Runnable action) throws InterruptedException {
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95 synchronized (lock_) {
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96 while (!(value_ != c)) lock_.wait();
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97 if (action != null) action.run();
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98 }
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99 }
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101 }
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102