Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/LayeredSync.java @ 32:243c74d599bf
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author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 12 Jun 2010 10:41:47 +0100 |
parents | 3dc0c5604566 |
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1 /* |
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2 File: LayeredSync.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 1Aug1998 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 that can be used to compose Syncs. |
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18 * A LayeredSync object manages two other Sync objects, |
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19 * <em>outer</em> and <em>inner</em>. The acquire operation |
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20 * invokes <em>outer</em>.acquire() followed by <em>inner</em>.acquire(), |
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21 * but backing out of outer (via release) upon an exception in inner. |
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22 * The other methods work similarly. |
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23 * <p> |
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24 * LayeredSyncs can be used to compose arbitrary chains |
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25 * by arranging that either of the managed Syncs be another |
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26 * LayeredSync. |
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27 * |
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28 * <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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29 **/ |
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30 |
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31 |
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32 public class LayeredSync implements Sync { |
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33 |
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34 protected final Sync outer_; |
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35 protected final Sync inner_; |
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36 |
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37 /** |
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38 * Create a LayeredSync managing the given outer and inner Sync |
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39 * objects |
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40 **/ |
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41 |
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42 public LayeredSync(Sync outer, Sync inner) { |
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43 outer_ = outer; |
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44 inner_ = inner; |
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45 } |
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46 |
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47 public void acquire() throws InterruptedException { |
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48 outer_.acquire(); |
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49 try { |
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50 inner_.acquire(); |
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51 } |
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52 catch (InterruptedException ex) { |
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53 outer_.release(); |
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54 throw ex; |
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55 } |
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56 } |
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57 |
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58 public boolean attempt(long msecs) throws InterruptedException { |
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59 |
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60 long start = (msecs <= 0)? 0 : System.currentTimeMillis(); |
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61 long waitTime = msecs; |
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62 |
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63 if (outer_.attempt(waitTime)) { |
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64 try { |
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65 if (msecs > 0) |
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66 waitTime = msecs - (System.currentTimeMillis() - start); |
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67 if (inner_.attempt(waitTime)) |
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68 return true; |
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69 else { |
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70 outer_.release(); |
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71 return false; |
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72 } |
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73 } |
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74 catch (InterruptedException ex) { |
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75 outer_.release(); |
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76 throw ex; |
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77 } |
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78 } |
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79 else |
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80 return false; |
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81 } |
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82 |
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83 public void release() { |
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84 inner_.release(); |
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85 outer_.release(); |
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86 } |
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87 |
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88 } |
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90 |