Mercurial > hg > blitz_stable

annotate src/EDU/oswego/cs/dl/util/concurrent/SemaphoreControlledChannel.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: 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 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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157 }
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158 }
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Dan Creswell <dan.creswell@gmail.com>
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159
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160 }