Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/SemaphoreControlledChannel.java @ 8:fa7203ea1622
Remove some dead code (Dave Brosius)
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 23 May 2009 11:27:41 +0100 |
parents | 3dc0c5604566 |
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0
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1 /* |
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2 File: SemaphoreControlledChannel.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 16Jun1998 dl Create public version |
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12 5Aug1998 dl replaced int counters with longs |
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13 08dec2001 dl reflective constructor now uses longs too. |
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14 */ |
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15 |
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16 package EDU.oswego.cs.dl.util.concurrent; |
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17 import java.lang.reflect.*; |
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18 |
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19 /** |
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20 * Abstract class for channels that use Semaphores to |
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21 * control puts and takes. |
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22 * <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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23 **/ |
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24 |
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25 public abstract class SemaphoreControlledChannel implements BoundedChannel { |
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26 protected final Semaphore putGuard_; |
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27 protected final Semaphore takeGuard_; |
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28 protected int capacity_; |
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29 |
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30 /** |
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31 * Create a channel with the given capacity and default |
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32 * semaphore implementation |
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33 * @exception IllegalArgumentException if capacity less or equal to zero |
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34 **/ |
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35 |
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36 public SemaphoreControlledChannel(int capacity) |
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37 throws IllegalArgumentException { |
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38 if (capacity <= 0) throw new IllegalArgumentException(); |
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39 capacity_ = capacity; |
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40 putGuard_ = new Semaphore(capacity); |
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41 takeGuard_ = new Semaphore(0); |
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42 } |
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43 |
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44 |
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45 /** |
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46 * Create a channel with the given capacity and |
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47 * semaphore implementations instantiated from the supplied class |
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48 * @exception IllegalArgumentException if capacity less or equal to zero. |
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49 * @exception NoSuchMethodException If class does not have constructor |
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50 * that intializes permits |
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51 * @exception SecurityException if constructor information |
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52 * not accessible |
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53 * @exception InstantiationException if semaphore class is abstract |
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54 * @exception IllegalAccessException if constructor cannot be called |
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55 * @exception InvocationTargetException if semaphore constructor throws an |
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56 * exception |
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57 **/ |
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58 public SemaphoreControlledChannel(int capacity, Class semaphoreClass) |
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59 throws IllegalArgumentException, |
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60 NoSuchMethodException, |
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61 SecurityException, |
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62 InstantiationException, |
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63 IllegalAccessException, |
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64 InvocationTargetException { |
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65 if (capacity <= 0) throw new IllegalArgumentException(); |
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66 capacity_ = capacity; |
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67 Class[] longarg = { Long.TYPE }; |
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68 Constructor ctor = semaphoreClass.getDeclaredConstructor(longarg); |
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69 Long[] cap = { new Long(capacity) }; |
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70 putGuard_ = (Semaphore)(ctor.newInstance(cap)); |
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71 Long[] zero = { new Long(0) }; |
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72 takeGuard_ = (Semaphore)(ctor.newInstance(zero)); |
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73 } |
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74 |
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75 |
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76 |
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77 public int capacity() { return capacity_; } |
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78 |
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79 /** |
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80 * Return the number of elements in the buffer. |
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81 * This is only a snapshot value, that may change |
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82 * immediately after returning. |
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83 **/ |
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84 |
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85 public int size() { return (int)(takeGuard_.permits()); } |
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86 |
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87 /** |
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88 * Internal mechanics of put. |
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89 **/ |
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90 protected abstract void insert(Object x); |
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91 |
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92 /** |
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93 * Internal mechanics of take. |
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94 **/ |
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95 protected abstract Object extract(); |
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96 |
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97 public void put(Object x) throws InterruptedException { |
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98 if (x == null) throw new IllegalArgumentException(); |
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99 if (Thread.interrupted()) throw new InterruptedException(); |
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100 putGuard_.acquire(); |
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101 try { |
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102 insert(x); |
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103 takeGuard_.release(); |
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104 } |
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105 catch (ClassCastException ex) { |
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106 putGuard_.release(); |
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107 throw ex; |
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108 } |
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109 } |
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110 |
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111 public boolean offer(Object x, long msecs) throws InterruptedException { |
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112 if (x == null) throw new IllegalArgumentException(); |
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113 if (Thread.interrupted()) throw new InterruptedException(); |
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114 if (!putGuard_.attempt(msecs)) |
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115 return false; |
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116 else { |
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117 try { |
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118 insert(x); |
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119 takeGuard_.release(); |
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120 return true; |
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121 } |
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122 catch (ClassCastException ex) { |
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123 putGuard_.release(); |
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124 throw ex; |
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125 } |
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126 } |
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127 } |
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128 |
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129 public Object take() throws InterruptedException { |
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130 if (Thread.interrupted()) throw new InterruptedException(); |
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131 takeGuard_.acquire(); |
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132 try { |
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133 Object x = extract(); |
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134 putGuard_.release(); |
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135 return x; |
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136 } |
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137 catch (ClassCastException ex) { |
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138 takeGuard_.release(); |
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139 throw ex; |
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140 } |
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141 } |
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142 |
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143 public Object poll(long msecs) throws InterruptedException { |
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144 if (Thread.interrupted()) throw new InterruptedException(); |
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145 if (!takeGuard_.attempt(msecs)) |
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146 return null; |
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147 else { |
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148 try { |
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149 Object x = extract(); |
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150 putGuard_.release(); |
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151 return x; |
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152 } |
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153 catch (ClassCastException ex) { |
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154 takeGuard_.release(); |
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155 throw ex; |
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156 } |
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157 } |
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158 } |
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159 |
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160 } |