Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/misc/CVBuffer.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 package EDU.oswego.cs.dl.util.concurrent.misc; |
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3 import EDU.oswego.cs.dl.util.concurrent.*; |
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4 |
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5 |
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6 public class CVBuffer implements BoundedChannel { |
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7 private final Mutex mutex; |
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8 private final CondVar notFull; |
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9 private final CondVar notEmpty; |
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10 private int count = 0; |
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11 private int takePtr = 0; |
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12 private int putPtr = 0; |
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13 private final Object[] array; |
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14 |
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15 public CVBuffer(int cap) { |
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16 array = new Object[cap]; |
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17 mutex = new Mutex(); |
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18 notFull = new CondVar(mutex); |
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19 notEmpty = new CondVar(mutex); |
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20 } |
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21 |
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22 public CVBuffer() { |
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23 this(DefaultChannelCapacity.get()); |
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24 } |
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25 |
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26 public int capacity() { return array.length; } |
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27 |
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28 public void put(Object x) throws InterruptedException { |
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29 mutex.acquire(); |
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30 try { |
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31 while (count == array.length) { |
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32 notFull.await(); |
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33 } |
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34 array[putPtr] = x; |
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35 putPtr = (putPtr + 1) % array.length; |
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36 ++count; |
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37 notEmpty.signal(); |
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38 } |
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39 finally { |
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40 mutex.release(); |
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41 } |
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42 } |
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43 |
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44 public Object take() throws InterruptedException { |
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45 Object x = null; |
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46 mutex.acquire(); |
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47 try { |
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48 while (count == 0) { |
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49 notEmpty.await(); |
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50 } |
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51 x = array[takePtr]; |
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52 array[takePtr] = null; |
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53 takePtr = (takePtr + 1) % array.length; |
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54 --count; |
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55 notFull.signal(); |
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56 } |
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57 finally { |
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58 mutex.release(); |
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59 } |
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60 return x; |
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61 } |
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62 |
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63 public boolean offer(Object x, long msecs) throws InterruptedException { |
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64 mutex.acquire(); |
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65 try { |
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66 if (count == array.length) { |
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67 notFull.timedwait(msecs); |
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68 if (count == array.length) |
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69 return false; |
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70 } |
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71 array[putPtr] = x; |
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72 putPtr = (putPtr + 1) % array.length; |
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73 ++count; |
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74 notEmpty.signal(); |
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75 return true; |
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76 } |
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77 finally { |
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78 mutex.release(); |
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79 } |
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80 } |
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81 |
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82 public Object poll(long msecs) throws InterruptedException { |
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83 Object x = null; |
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84 mutex.acquire(); |
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85 try { |
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86 if (count == 0) { |
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87 notEmpty.timedwait(msecs); |
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88 if (count == 0) |
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89 return null; |
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90 } |
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91 x = array[takePtr]; |
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92 array[takePtr] = null; |
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93 takePtr = (takePtr + 1) % array.length; |
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94 --count; |
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95 notFull.signal(); |
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96 } |
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97 finally { |
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98 mutex.release(); |
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99 } |
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100 return x; |
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101 } |
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102 |
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103 public Object peek() { |
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104 try { |
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105 mutex.acquire(); |
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106 try { |
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107 if (count == 0) |
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108 return null; |
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109 else |
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110 return array[takePtr]; |
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111 } |
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112 finally { |
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113 mutex.release(); |
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114 } |
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115 } |
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116 catch (InterruptedException ex) { |
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117 Thread.currentThread().interrupt(); |
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118 return null; |
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119 } |
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120 } |
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121 |
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122 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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