Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/BoundedBuffer.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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0
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1 /* |
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2 File: BoundedBuffer.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 11Jun1998 dl Create public version |
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12 17Jul1998 dl Simplified by eliminating wait counts |
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13 25aug1998 dl added peek |
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14 5May1999 dl replace % with conditional (slightly faster) |
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15 */ |
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16 |
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17 package EDU.oswego.cs.dl.util.concurrent; |
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18 |
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19 /** |
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20 * Efficient array-based bounded buffer class. |
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21 * Adapted from CPJ, chapter 8, which describes design. |
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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>] <p> |
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23 **/ |
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24 |
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25 public class BoundedBuffer implements BoundedChannel { |
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26 |
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27 protected final Object[] array_; // the elements |
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28 |
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29 protected int takePtr_ = 0; // circular indices |
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30 protected int putPtr_ = 0; |
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31 |
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32 protected int usedSlots_ = 0; // length |
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33 protected int emptySlots_; // capacity - length |
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34 |
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35 /** |
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36 * Helper monitor to handle puts. |
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37 **/ |
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38 protected final Object putMonitor_ = new Object(); |
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39 |
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40 /** |
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41 * Create a BoundedBuffer with the given capacity. |
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42 * @exception IllegalArgumentException if capacity less or equal to zero |
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43 **/ |
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44 public BoundedBuffer(int capacity) throws IllegalArgumentException { |
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45 if (capacity <= 0) throw new IllegalArgumentException(); |
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46 array_ = new Object[capacity]; |
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47 emptySlots_ = capacity; |
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48 } |
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49 |
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50 /** |
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51 * Create a buffer with the current default capacity |
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52 **/ |
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53 |
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54 public BoundedBuffer() { |
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55 this(DefaultChannelCapacity.get()); |
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56 } |
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57 |
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58 /** |
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59 * Return the number of elements in the buffer. |
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60 * This is only a snapshot value, that may change |
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61 * immediately after returning. |
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62 **/ |
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63 public synchronized int size() { return usedSlots_; } |
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64 |
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65 public int capacity() { return array_.length; } |
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66 |
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67 protected void incEmptySlots() { |
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68 synchronized(putMonitor_) { |
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69 ++emptySlots_; |
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70 putMonitor_.notify(); |
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71 } |
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72 } |
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73 |
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74 protected synchronized void incUsedSlots() { |
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75 ++usedSlots_; |
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76 notify(); |
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77 } |
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78 |
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79 protected final void insert(Object x) { // mechanics of put |
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80 --emptySlots_; |
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81 array_[putPtr_] = x; |
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82 if (++putPtr_ >= array_.length) putPtr_ = 0; |
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83 } |
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84 |
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85 protected final Object extract() { // mechanics of take |
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86 --usedSlots_; |
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87 Object old = array_[takePtr_]; |
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88 array_[takePtr_] = null; |
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89 if (++takePtr_ >= array_.length) takePtr_ = 0; |
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90 return old; |
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91 } |
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92 |
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93 public Object peek() { |
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94 synchronized(this) { |
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95 if (usedSlots_ > 0) |
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96 return array_[takePtr_]; |
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97 else |
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98 return null; |
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99 } |
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100 } |
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101 |
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102 |
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103 public void put(Object x) throws InterruptedException { |
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104 if (x == null) throw new IllegalArgumentException(); |
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105 if (Thread.interrupted()) throw new InterruptedException(); |
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106 |
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107 synchronized(putMonitor_) { |
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108 while (emptySlots_ <= 0) { |
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109 try { putMonitor_.wait(); } |
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110 catch (InterruptedException ex) { |
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111 putMonitor_.notify(); |
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112 throw ex; |
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113 } |
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114 } |
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115 insert(x); |
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116 } |
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117 incUsedSlots(); |
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118 } |
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119 |
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120 public boolean offer(Object x, long msecs) throws InterruptedException { |
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121 if (x == null) throw new IllegalArgumentException(); |
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122 if (Thread.interrupted()) throw new InterruptedException(); |
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123 |
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124 synchronized(putMonitor_) { |
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125 long start = (msecs <= 0)? 0 : System.currentTimeMillis(); |
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126 long waitTime = msecs; |
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127 while (emptySlots_ <= 0) { |
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128 if (waitTime <= 0) return false; |
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129 try { putMonitor_.wait(waitTime); } |
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130 catch (InterruptedException ex) { |
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131 putMonitor_.notify(); |
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132 throw ex; |
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133 } |
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134 waitTime = msecs - (System.currentTimeMillis() - start); |
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135 } |
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136 insert(x); |
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137 } |
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138 incUsedSlots(); |
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139 return true; |
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140 } |
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141 |
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142 |
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143 |
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144 public Object take() throws InterruptedException { |
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145 if (Thread.interrupted()) throw new InterruptedException(); |
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146 Object old = null; |
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147 synchronized(this) { |
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148 while (usedSlots_ <= 0) { |
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149 try { wait(); } |
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150 catch (InterruptedException ex) { |
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151 notify(); |
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152 throw ex; |
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153 } |
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154 } |
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155 old = extract(); |
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156 } |
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157 incEmptySlots(); |
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158 return old; |
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159 } |
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160 |
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161 public Object poll(long msecs) throws InterruptedException { |
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162 if (Thread.interrupted()) throw new InterruptedException(); |
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163 Object old = null; |
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164 synchronized(this) { |
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165 long start = (msecs <= 0)? 0 : System.currentTimeMillis(); |
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166 long waitTime = msecs; |
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167 |
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168 while (usedSlots_ <= 0) { |
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169 if (waitTime <= 0) return null; |
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170 try { wait(waitTime); } |
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171 catch (InterruptedException ex) { |
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172 notify(); |
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173 throw ex; |
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174 } |
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175 waitTime = msecs - (System.currentTimeMillis() - start); |
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176 |
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177 } |
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178 old = extract(); |
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179 } |
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180 incEmptySlots(); |
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181 return old; |
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182 } |
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183 |
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184 } |
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185 |
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186 |