Mercurial > hg > blitz_stable
annotate src/EDU/oswego/cs/dl/util/concurrent/BoundedLinkedQueue.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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1 /* |
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2 File: BoundedLinkedQueue.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 10oct1999 dl lock on node object to ensure visibility |
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15 27jan2000 dl setCapacity forces immediate permit reconcile |
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16 */ |
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17 |
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18 package EDU.oswego.cs.dl.util.concurrent; |
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19 |
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20 /** |
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21 * A bounded variant of |
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22 * LinkedQueue |
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23 * class. This class may be |
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24 * preferable to |
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25 * BoundedBuffer |
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26 * because it allows a bit more |
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27 * concurency among puts and takes, because it does not |
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28 * pre-allocate fixed storage for elements, and allows |
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29 * capacity to be dynamically reset. |
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30 * On the other hand, since it allocates a node object |
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31 * on each put, it can be slow on systems with slow |
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32 * allocation and GC. |
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33 * Also, it may be |
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34 * preferable to |
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35 * LinkedQueue |
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36 * when you need to limit |
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37 * the capacity to prevent resource exhaustion. This protection |
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38 * normally does not hurt much performance-wise: When the |
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39 * queue is not empty or full, most puts and |
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40 * takes are still usually able to execute concurrently. |
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41 * @see LinkedQueue |
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42 * @see BoundedBuffer |
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43 * <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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44 **/ |
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45 |
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46 public class BoundedLinkedQueue implements BoundedChannel { |
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47 |
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48 /* |
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49 * It might be a bit nicer if this were declared as |
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50 * a subclass of LinkedQueue, or a sibling class of |
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51 * a common abstract class. It shares much of the |
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52 * basic design and bookkeeping fields. But too |
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53 * many details differ to make this worth doing. |
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54 */ |
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55 |
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56 |
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57 |
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58 /** |
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59 * Dummy header node of list. The first actual node, if it exists, is always |
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60 * at head_.next. After each take, the old first node becomes the head. |
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61 **/ |
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62 protected LinkedNode head_; |
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63 |
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64 /** |
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65 * The last node of list. Put() appends to list, so modifies last_ |
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66 **/ |
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67 protected LinkedNode last_; |
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68 |
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69 |
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70 /** |
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71 * Helper monitor. Ensures that only one put at a time executes. |
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72 **/ |
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73 |
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74 protected final Object putGuard_ = new Object(); |
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75 |
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76 /** |
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77 * Helper monitor. Protects and provides wait queue for takes |
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78 **/ |
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79 |
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80 protected final Object takeGuard_ = new Object(); |
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81 |
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82 |
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83 /** Number of elements allowed **/ |
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84 protected int capacity_; |
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85 |
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86 |
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87 /** |
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88 * One side of a split permit count. |
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89 * The counts represent permits to do a put. (The queue is full when zero). |
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90 * Invariant: putSidePutPermits_ + takeSidePutPermits_ = capacity_ - length. |
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91 * (The length is never separately recorded, so this cannot be |
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92 * checked explicitly.) |
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93 * To minimize contention between puts and takes, the |
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94 * put side uses up all of its permits before transfering them from |
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95 * the take side. The take side just increments the count upon each take. |
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96 * Thus, most puts and take can run independently of each other unless |
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97 * the queue is empty or full. |
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98 * Initial value is queue capacity. |
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99 **/ |
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100 |
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101 protected int putSidePutPermits_; |
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102 |
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103 /** Number of takes since last reconcile **/ |
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104 protected int takeSidePutPermits_ = 0; |
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105 |
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106 |
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107 /** |
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108 * Create a queue with the given capacity |
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109 * @exception IllegalArgumentException if capacity less or equal to zero |
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110 **/ |
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111 public BoundedLinkedQueue(int capacity) { |
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112 if (capacity <= 0) throw new IllegalArgumentException(); |
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113 capacity_ = capacity; |
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114 putSidePutPermits_ = capacity; |
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115 head_ = new LinkedNode(null); |
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116 last_ = head_; |
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117 } |
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118 |
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119 /** |
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120 * Create a queue with the current default capacity |
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121 **/ |
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122 |
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123 public BoundedLinkedQueue() { |
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124 this(DefaultChannelCapacity.get()); |
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125 } |
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126 |
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127 /** |
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128 * Move put permits from take side to put side; |
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129 * return the number of put side permits that are available. |
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130 * Call only under synch on puGuard_ AND this. |
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131 **/ |
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132 protected final int reconcilePutPermits() { |
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133 putSidePutPermits_ += takeSidePutPermits_; |
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134 takeSidePutPermits_ = 0; |
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135 return putSidePutPermits_; |
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136 } |
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137 |
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138 |
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139 /** Return the current capacity of this queue **/ |
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140 public synchronized int capacity() { return capacity_; } |
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141 |
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142 |
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143 /** |
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144 * Return the number of elements in the queue. |
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145 * This is only a snapshot value, that may be in the midst |
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146 * of changing. The returned value will be unreliable in the presence of |
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147 * active puts and takes, and should only be used as a heuristic |
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148 * estimate, for example for resource monitoring purposes. |
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149 **/ |
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150 public synchronized int size() { |
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151 /* |
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152 This should ideally synch on putGuard_, but |
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153 doing so would cause it to block waiting for an in-progress |
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154 put, which might be stuck. So we instead use whatever |
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155 value of putSidePutPermits_ that we happen to read. |
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156 */ |
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157 return capacity_ - (takeSidePutPermits_ + putSidePutPermits_); |
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158 } |
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159 |
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160 |
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161 /** |
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162 * Reset the capacity of this queue. |
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163 * If the new capacity is less than the old capacity, |
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164 * existing elements are NOT removed, but |
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165 * incoming puts will not proceed until the number of elements |
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166 * is less than the new capacity. |
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167 * @exception IllegalArgumentException if capacity less or equal to zero |
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168 **/ |
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169 |
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170 public void setCapacity(int newCapacity) { |
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171 if (newCapacity <= 0) throw new IllegalArgumentException(); |
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172 synchronized (putGuard_) { |
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173 synchronized(this) { |
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174 takeSidePutPermits_ += (newCapacity - capacity_); |
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175 capacity_ = newCapacity; |
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176 |
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177 // Force immediate reconcilation. |
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178 reconcilePutPermits(); |
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179 notifyAll(); |
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180 } |
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181 } |
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182 } |
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183 |
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184 |
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185 /** Main mechanics for take/poll **/ |
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186 protected synchronized Object extract() { |
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187 synchronized(head_) { |
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188 Object x = null; |
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189 LinkedNode first = head_.next; |
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190 if (first != null) { |
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191 x = first.value; |
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192 first.value = null; |
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193 head_ = first; |
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194 ++takeSidePutPermits_; |
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195 notify(); |
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196 } |
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197 return x; |
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198 } |
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199 } |
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200 |
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201 public Object peek() { |
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202 synchronized(head_) { |
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203 LinkedNode first = head_.next; |
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204 if (first != null) |
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205 return first.value; |
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206 else |
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207 return null; |
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208 } |
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209 } |
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210 |
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211 public Object take() throws InterruptedException { |
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212 if (Thread.interrupted()) throw new InterruptedException(); |
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213 Object x = extract(); |
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214 if (x != null) |
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215 return x; |
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216 else { |
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217 synchronized(takeGuard_) { |
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218 try { |
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219 for (;;) { |
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220 x = extract(); |
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221 if (x != null) { |
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222 return x; |
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223 } |
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224 else { |
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225 takeGuard_.wait(); |
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226 } |
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227 } |
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228 } |
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229 catch(InterruptedException ex) { |
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230 takeGuard_.notify(); |
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231 throw ex; |
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232 } |
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233 } |
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234 } |
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235 } |
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236 |
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237 public Object poll(long msecs) throws InterruptedException { |
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238 if (Thread.interrupted()) throw new InterruptedException(); |
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239 Object x = extract(); |
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240 if (x != null) |
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241 return x; |
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242 else { |
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243 synchronized(takeGuard_) { |
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244 try { |
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245 long waitTime = msecs; |
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246 long start = (msecs <= 0)? 0: System.currentTimeMillis(); |
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247 for (;;) { |
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248 x = extract(); |
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249 if (x != null || waitTime <= 0) { |
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250 return x; |
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251 } |
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252 else { |
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253 takeGuard_.wait(waitTime); |
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254 waitTime = msecs - (System.currentTimeMillis() - start); |
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255 } |
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256 } |
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257 } |
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258 catch(InterruptedException ex) { |
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259 takeGuard_.notify(); |
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260 throw ex; |
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261 } |
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262 } |
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263 } |
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264 } |
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265 |
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266 /** Notify a waiting take if needed **/ |
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267 protected final void allowTake() { |
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268 synchronized(takeGuard_) { |
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269 takeGuard_.notify(); |
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270 } |
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271 } |
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272 |
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273 |
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274 /** |
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275 * Create and insert a node. |
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276 * Call only under synch on putGuard_ |
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277 **/ |
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278 protected void insert(Object x) { |
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279 --putSidePutPermits_; |
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280 LinkedNode p = new LinkedNode(x); |
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281 synchronized(last_) { |
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282 last_.next = p; |
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283 last_ = p; |
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284 } |
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285 } |
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286 |
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287 |
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288 /* |
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289 put and offer(ms) differ only in policy before insert/allowTake |
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290 */ |
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291 |
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292 public void put(Object x) throws InterruptedException { |
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293 if (x == null) throw new IllegalArgumentException(); |
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294 if (Thread.interrupted()) throw new InterruptedException(); |
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295 |
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296 synchronized(putGuard_) { |
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297 |
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298 if (putSidePutPermits_ <= 0) { // wait for permit. |
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299 synchronized(this) { |
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300 if (reconcilePutPermits() <= 0) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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301 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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302 for(;;) { |
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303 wait(); |
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304 if (reconcilePutPermits() > 0) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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305 break; |
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306 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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307 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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308 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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309 catch (InterruptedException ex) { |
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310 notify(); |
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311 throw ex; |
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312 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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313 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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314 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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315 } |
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316 insert(x); |
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317 } |
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318 // call outside of lock to loosen put/take coupling |
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319 allowTake(); |
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320 } |
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parents:
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321 |
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322 public boolean offer(Object x, long msecs) throws InterruptedException { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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323 if (x == null) throw new IllegalArgumentException(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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324 if (Thread.interrupted()) throw new InterruptedException(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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325 |
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326 synchronized(putGuard_) { |
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327 |
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328 if (putSidePutPermits_ <= 0) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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329 synchronized(this) { |
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330 if (reconcilePutPermits() <= 0) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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331 if (msecs <= 0) |
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332 return false; |
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333 else { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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334 try { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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335 long waitTime = msecs; |
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336 long start = System.currentTimeMillis(); |
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337 |
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338 for(;;) { |
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339 wait(waitTime); |
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340 if (reconcilePutPermits() > 0) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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341 break; |
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342 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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343 else { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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344 waitTime = msecs - (System.currentTimeMillis() - start); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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345 if (waitTime <= 0) { |
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346 return false; |
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347 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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348 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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349 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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350 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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351 catch (InterruptedException ex) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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352 notify(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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353 throw ex; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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354 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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355 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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356 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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357 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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358 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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359 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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360 insert(x); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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361 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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362 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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363 allowTake(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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364 return true; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
365 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
366 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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367 public boolean isEmpty() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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368 synchronized(head_) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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369 return head_.next == null; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
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370 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
371 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
372 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
373 } |