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annotate src/org/eclipse/jetty/util/ArrayQueue.java @ 1046:a8c92b0a08ed

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add JBuffer
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 07 Nov 2016 22:39:39 -0700
parents 3428c60d7cfc
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //
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2 // ========================================================================
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3 // Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
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4 // ------------------------------------------------------------------------
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5 // All rights reserved. This program and the accompanying materials
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6 // are made available under the terms of the Eclipse Public License v1.0
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7 // and Apache License v2.0 which accompanies this distribution.
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8 //
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9 // The Eclipse Public License is available at
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10 // http://www.eclipse.org/legal/epl-v10.html
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11 //
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12 // The Apache License v2.0 is available at
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13 // http://www.opensource.org/licenses/apache2.0.php
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14 //
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15 // You may elect to redistribute this code under either of these licenses.
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16 // ========================================================================
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17 //
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18
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19 package org.eclipse.jetty.util;
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20
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21 import java.util.AbstractList;
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22 import java.util.NoSuchElementException;
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23 import java.util.Queue;
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24
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25 /* ------------------------------------------------------------ */
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26 /**
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27 * Queue backed by circular array.
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28 * <p/>
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29 * This partial Queue implementation (also with {@link #remove()} for stack operation)
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30 * is backed by a growable circular array.
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31 *
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32 * @param <E>
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33 */
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34 public class ArrayQueue<E> extends AbstractList<E> implements Queue<E>
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35 {
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36 public static final int DEFAULT_CAPACITY = 64;
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37 public static final int DEFAULT_GROWTH = 32;
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38
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39 protected final Object _lock;
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40 protected final int _growCapacity;
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41 protected Object[] _elements;
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42 protected int _nextE;
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43 protected int _nextSlot;
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44 protected int _size;
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45
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46 /* ------------------------------------------------------------ */
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47 public ArrayQueue()
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48 {
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49 this(DEFAULT_CAPACITY, -1);
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50 }
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51
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52 /* ------------------------------------------------------------ */
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53 public ArrayQueue(int capacity)
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54 {
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55 this(capacity, -1);
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56 }
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57
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58 /* ------------------------------------------------------------ */
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59 public ArrayQueue(int initCapacity, int growBy)
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60 {
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61 this(initCapacity, growBy, null);
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62 }
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63
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64 /* ------------------------------------------------------------ */
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65 public ArrayQueue(int initCapacity, int growBy, Object lock)
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66 {
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67 _lock = lock == null ? this : lock;
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68 _growCapacity = growBy;
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69 _elements = new Object[initCapacity];
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70 }
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71
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72 /* ------------------------------------------------------------ */
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73 public int getCapacity()
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74 {
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75 synchronized (_lock)
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76 {
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77 return _elements.length;
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78 }
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79 }
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80
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81 /* ------------------------------------------------------------ */
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82 @Override
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83 public boolean add(E e)
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84 {
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85 if (!offer(e))
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86 throw new IllegalStateException("Full");
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87 return true;
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88 }
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89
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90 /* ------------------------------------------------------------ */
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91 public boolean offer(E e)
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92 {
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93 synchronized (_lock)
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94 {
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95 return enqueue(e);
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96 }
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97 }
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98
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99 /* ------------------------------------------------------------ */
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100 private boolean enqueue(E e)
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101 {
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102 if (_size == _elements.length && !grow())
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103 return false;
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104
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105 _size++;
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106 _elements[_nextSlot++] = e;
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107 if (_nextSlot == _elements.length)
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108 _nextSlot = 0;
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109
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110 return true;
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111 }
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112
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113 /* ------------------------------------------------------------ */
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114 /**
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115 * Add without synchronization or bounds checking
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116 *
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117 * @param e the element to add
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118 * @see #add(Object)
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119 */
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120 public void addUnsafe(E e)
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121 {
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122 if (!enqueue(e))
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123 throw new IllegalStateException("Full");
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124 }
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125
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126 /* ------------------------------------------------------------ */
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127 public E element()
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128 {
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129 synchronized (_lock)
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130 {
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131 if (isEmpty())
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132 throw new NoSuchElementException();
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133 return at(_nextE);
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134 }
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135 }
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136
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137 @SuppressWarnings("unchecked")
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138 private E at(int index)
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139 {
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140 return (E)_elements[index];
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141 }
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142
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143 /* ------------------------------------------------------------ */
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144 public E peek()
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145 {
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146 synchronized (_lock)
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147 {
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148 if (isEmpty())
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149 return null;
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150 return at(_nextE);
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151 }
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152 }
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153
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154 /* ------------------------------------------------------------ */
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155 public E poll()
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156 {
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157 synchronized (_lock)
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158 {
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159 if (_size == 0)
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160 return null;
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161 return dequeue();
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162 }
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163 }
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164
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165 /* ------------------------------------------------------------ */
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166 private E dequeue()
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167 {
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168 E e = at(_nextE);
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169 _elements[_nextE] = null;
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170 _size--;
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171 if (++_nextE == _elements.length)
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172 _nextE = 0;
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173 return e;
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174 }
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175
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parents:
diff changeset
176 /* ------------------------------------------------------------ */
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177 public E remove()
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178 {
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179 synchronized (_lock)
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180 {
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parents:
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181 if (_size == 0)
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182 throw new NoSuchElementException();
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183 return dequeue();
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184 }
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parents:
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185 }
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parents:
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186
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parents:
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187 /* ------------------------------------------------------------ */
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diff changeset
188 @Override
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189 public void clear()
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190 {
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191 synchronized (_lock)
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192 {
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193 _size = 0;
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194 _nextE = 0;
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195 _nextSlot = 0;
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196 }
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parents:
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197 }
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198
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199 /* ------------------------------------------------------------ */
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200 @Override
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201 public boolean isEmpty()
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202 {
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203 synchronized (_lock)
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204 {
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205 return _size == 0;
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206 }
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207 }
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208
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parents:
diff changeset
209 /* ------------------------------------------------------------ */
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diff changeset
210 @Override
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211 public int size()
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212 {
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213 synchronized (_lock)
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parents:
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214 {
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215 return _size;
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216 }
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217 }
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parents:
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218
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parents:
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219 /* ------------------------------------------------------------ */
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diff changeset
220 @Override
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diff changeset
221 public E get(int index)
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diff changeset
222 {
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parents:
diff changeset
223 synchronized (_lock)
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parents:
diff changeset
224 {
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
225 if (index < 0 || index >= _size)
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
226 throw new IndexOutOfBoundsException("!(" + 0 + "<" + index + "<=" + _size + ")");
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
227 return getUnsafe(index);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
228 }
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
229 }
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
230
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
231 /* ------------------------------------------------------------ */
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
232 /**
3428c60d7cfc replace jetty jars with source
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diff changeset
233 * Get without synchronization or bounds checking.
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
234 *
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
235 * @param index index of the element to return
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
236 * @return the element at the specified index
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
237 * @see #get(int)
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
238 */
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
239 public E getUnsafe(int index)
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
240 {
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
241 int i = (_nextE + index) % _elements.length;
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
242 return at(i);
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
243 }
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
244
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
245 /* ------------------------------------------------------------ */
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
246 @Override
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
247 public E remove(int index)
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
248 {
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
249 synchronized (_lock)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
250 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
251 if (index < 0 || index >= _size)
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
252 throw new IndexOutOfBoundsException("!(" + 0 + "<" + index + "<=" + _size + ")");
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
253
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
254 int i = (_nextE + index) % _elements.length;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
255 E old = at(i);
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
256
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
257 if (i < _nextSlot)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
258 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
259 // 0 _elements.length
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
260 // _nextE........._nextSlot
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
261 System.arraycopy(_elements, i + 1, _elements, i, _nextSlot - i);
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
262 _nextSlot--;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
263 _size--;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
264 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
265 else
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
266 {
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
267 // 0 _elements.length
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
268 // ......_nextSlot _nextE..........
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
269 System.arraycopy(_elements, i + 1, _elements, i, _elements.length - i - 1);
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
270 if (_nextSlot > 0)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
271 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
272 _elements[_elements.length - 1] = _elements[0];
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
273 System.arraycopy(_elements, 1, _elements, 0, _nextSlot - 1);
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
274 _nextSlot--;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
275 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
276 else
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
277 _nextSlot = _elements.length - 1;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
278
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
279 _size--;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
280 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
281
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
282 return old;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
283 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
284 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
285
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
286 /* ------------------------------------------------------------ */
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
287 @Override
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
288 public E set(int index, E element)
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
289 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
290 synchronized (_lock)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
291 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
292 if (index < 0 || index >= _size)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
293 throw new IndexOutOfBoundsException("!(" + 0 + "<" + index + "<=" + _size + ")");
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
294
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
295 int i = _nextE + index;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
296 if (i >= _elements.length)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
297 i -= _elements.length;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
298 E old = at(i);
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
299 _elements[i] = element;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
300 return old;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
301 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
302 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
303
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
304 /* ------------------------------------------------------------ */
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
305 @Override
3428c60d7cfc replace jetty jars with source
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parents:
diff changeset
306 public void add(int index, E element)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
307 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
308 synchronized (_lock)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
309 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
310 if (index < 0 || index > _size)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
311 throw new IndexOutOfBoundsException("!(" + 0 + "<" + index + "<=" + _size + ")");
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
312
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
313 if (_size == _elements.length && !grow())
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
314 throw new IllegalStateException("Full");
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
315
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
316 if (index == _size)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
317 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
318 add(element);
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
319 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
320 else
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
321 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
322 int i = _nextE + index;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
323 if (i >= _elements.length)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
324 i -= _elements.length;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
325
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
326 _size++;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
327 _nextSlot++;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
328 if (_nextSlot == _elements.length)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
329 _nextSlot = 0;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
330
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
331 if (i < _nextSlot)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
332 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
333 // 0 _elements.length
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
334 // _nextE.....i..._nextSlot
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
335 // 0 _elements.length
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
336 // ..i..._nextSlot _nextE..........
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
337 System.arraycopy(_elements, i, _elements, i + 1, _nextSlot - i);
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
338 _elements[i] = element;
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
339 }
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
340 else
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
341 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
342 // 0 _elements.length
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
343 // ......_nextSlot _nextE.....i....
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
344 if (_nextSlot > 0)
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
345 {
3428c60d7cfc replace jetty jars with source
Franklin Schmidt <fschmidt@gmail.com>
parents:
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346 System.arraycopy(_elements, 0, _elements, 1, _nextSlot);
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347 _elements[0] = _elements[_elements.length - 1];
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348 }
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349
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350 System.arraycopy(_elements, i, _elements, i + 1, _elements.length - i - 1);
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351 _elements[i] = element;
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352 }
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353 }
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354 }
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355 }
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356
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357 /* ------------------------------------------------------------ */
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358 protected boolean grow()
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359 {
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360 synchronized (_lock)
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361 {
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362 if (_growCapacity <= 0)
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363 return false;
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364
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365 Object[] elements = new Object[_elements.length + _growCapacity];
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366
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367 int split = _elements.length - _nextE;
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368 if (split > 0)
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369 System.arraycopy(_elements, _nextE, elements, 0, split);
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370 if (_nextE != 0)
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371 System.arraycopy(_elements, 0, elements, split, _nextSlot);
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372
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373 _elements = elements;
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374 _nextE = 0;
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375 _nextSlot = _size;
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376 return true;
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377 }
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378 }
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379 }