Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/WaitableRef.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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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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100 |
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101 } |
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102 |