Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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1 /* |
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2 File: ConcurrentHashMap |
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3 |
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4 Written by Doug Lea. Adapted from JDK1.2 HashMap.java and Hashtable.java |
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5 which carries the following copyright: |
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6 |
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7 * Copyright 1997 by Sun Microsystems, Inc., |
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8 * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A. |
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9 * All rights reserved. |
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10 * |
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11 * This software is the confidential and proprietary information |
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12 * of Sun Microsystems, Inc. ("Confidential Information"). You |
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13 * shall not disclose such Confidential Information and shall use |
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14 * it only in accordance with the terms of the license agreement |
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15 * you entered into with Sun. |
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16 |
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17 History: |
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18 Date Who What |
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19 26nov2000 dl Created, based on ConcurrentReaderHashMap |
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20 12jan2001 dl public release |
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21 17nov2001 dl Minor tunings |
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22 */ |
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23 |
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24 package EDU.oswego.cs.dl.util.concurrent; |
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25 |
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26 import java.util.Map; |
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27 import java.util.AbstractMap; |
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28 import java.util.AbstractSet; |
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29 import java.util.AbstractCollection; |
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30 import java.util.Collection; |
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31 import java.util.Set; |
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32 import java.util.Iterator; |
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33 import java.util.Enumeration; |
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34 import java.util.NoSuchElementException; |
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35 |
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36 import java.io.Serializable; |
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37 import java.io.IOException; |
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38 import java.io.ObjectInputStream; |
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39 import java.io.ObjectOutputStream; |
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40 |
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41 |
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42 /** |
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43 * A version of Hashtable supporting |
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44 * concurrency for both retrievals and updates: |
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45 * |
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46 * <dl> |
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47 * <dt> Retrievals |
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48 * |
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49 * <dd> Retrievals may overlap updates. (This is the same policy as |
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50 * ConcurrentReaderHashMap.) Successful retrievals using get(key) and |
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51 * containsKey(key) usually run without locking. Unsuccessful |
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52 * retrievals (i.e., when the key is not present) do involve brief |
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53 * synchronization (locking). Because retrieval operations can |
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54 * ordinarily overlap with update operations (i.e., put, remove, and |
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55 * their derivatives), retrievals can only be guaranteed to return the |
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56 * results of the most recently <em>completed</em> operations holding |
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57 * upon their onset. Retrieval operations may or may not return |
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58 * results reflecting in-progress writing operations. However, the |
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59 * retrieval operations do always return consistent results -- either |
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60 * those holding before any single modification or after it, but never |
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61 * a nonsense result. For aggregate operations such as putAll and |
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62 * clear, concurrent reads may reflect insertion or removal of only |
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63 * some entries. |
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64 * <p> |
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65 * |
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66 * Iterators and Enumerations (i.e., those returned by |
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67 * keySet().iterator(), entrySet().iterator(), values().iterator(), |
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68 * keys(), and elements()) return elements reflecting the state of the |
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69 * hash table at some point at or since the creation of the |
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70 * iterator/enumeration. They will return at most one instance of |
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71 * each element (via next()/nextElement()), but might or might not |
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72 * reflect puts and removes that have been processed since they were |
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73 * created. They do <em>not</em> throw ConcurrentModificationException. |
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74 * However, these iterators are designed to be used by only one |
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75 * thread at a time. Passing an iterator across multiple threads may |
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76 * lead to unpredictable results if the table is being concurrently |
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77 * modified. <p> |
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78 * |
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79 * |
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80 * <dt> Updates |
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81 * |
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82 * <dd> This class supports a hard-wired preset <em>concurrency |
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83 * level</em> of 32. This allows a maximum of 32 put and/or remove |
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84 * operations to proceed concurrently. This level is an upper bound on |
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85 * concurrency, not a guarantee, since it interacts with how |
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86 * well-strewn elements are across bins of the table. (The preset |
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87 * value in part reflects the fact that even on large multiprocessors, |
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88 * factors other than synchronization tend to be bottlenecks when more |
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89 * than 32 threads concurrently attempt updates.) |
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90 * Additionally, operations triggering internal resizing and clearing |
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91 * do not execute concurrently with any operation. |
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92 * <p> |
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93 * |
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94 * There is <em>NOT</em> any support for locking the entire table to |
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95 * prevent updates. This makes it imposssible, for example, to |
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96 * add an element only if it is not already present, since another |
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97 * thread may be in the process of doing the same thing. |
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98 * If you need such capabilities, consider instead using the |
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99 * ConcurrentReaderHashMap class. |
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100 * |
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101 * </dl> |
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102 * |
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103 * Because of how concurrency control is split up, the |
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104 * size() and isEmpty() methods require accumulations across 32 |
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105 * control segments, and so might be slightly slower than you expect. |
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106 * <p> |
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107 * |
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108 * This class may be used as a direct replacement for |
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109 * java.util.Hashtable in any application that does not rely |
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110 * on the ability to lock the entire table to prevent updates. |
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111 * As of this writing, it performs much faster than Hashtable in |
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112 * typical multi-threaded applications with multiple readers and writers. |
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113 * Like Hashtable but unlike java.util.HashMap, |
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114 * this class does NOT allow <tt>null</tt> to be used as a key or |
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115 * value. |
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116 * <p> |
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117 * |
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118 * Implementation note: A slightly |
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119 * faster implementation of this class will be possible once planned |
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120 * Java Memory Model revisions are in place. |
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121 * |
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122 * <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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123 |
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124 **/ |
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125 |
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126 |
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127 public class ConcurrentHashMap |
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128 extends AbstractMap |
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129 implements Map, Cloneable, Serializable { |
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130 |
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131 /* |
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132 The basic strategy is an optimistic-style scheme based on |
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133 the guarantee that the hash table and its lists are always |
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134 kept in a consistent enough state to be read without locking: |
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135 |
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136 * Read operations first proceed without locking, by traversing the |
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137 apparently correct list of the apparently correct bin. If an |
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138 entry is found, but not invalidated (value field null), it is |
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139 returned. If not found, operations must recheck (after a memory |
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140 barrier) to make sure they are using both the right list and |
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141 the right table (which can change under resizes). If |
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142 invalidated, reads must acquire main update lock to wait out |
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143 the update, and then re-traverse. |
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144 |
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145 * All list additions are at the front of each bin, making it easy |
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146 to check changes, and also fast to traverse. Entry next |
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147 pointers are never assigned. Remove() builds new nodes when |
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148 necessary to preserve this. |
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149 |
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150 * Remove() (also clear()) invalidates removed nodes to alert read |
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151 operations that they must wait out the full modifications. |
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152 |
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153 * Locking for puts, removes (and, when necessary gets, etc) |
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154 is controlled by Segments, each covering a portion of the |
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155 table. During operations requiring global exclusivity (mainly |
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156 resize and clear), ALL of these locks are acquired at once. |
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157 Note that these segments are NOT contiguous -- they are based |
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158 on the least 5 bits of hashcodes. This ensures that the same |
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159 segment controls the same slots before and after resizing, which |
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160 is necessary for supporting concurrent retrievals. This |
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161 comes at the price of a mismatch of logical vs physical locality, |
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162 but this seems not to be a performance problem in practice. |
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163 |
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164 */ |
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165 |
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166 /** |
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167 * The hash table data. |
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168 */ |
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169 protected transient Entry[] table; |
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170 |
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171 |
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172 /** |
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173 * The number of concurrency control segments. |
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174 * The value can be at most 32 since ints are used |
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175 * as bitsets over segments. Emprically, it doesn't |
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176 * seem to pay to decrease it either, so the value should be at least 32. |
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177 * In other words, do not redefine this :-) |
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178 **/ |
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179 |
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180 protected static final int CONCURRENCY_LEVEL = 32; |
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181 |
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182 /** |
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183 * Mask value for indexing into segments |
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184 **/ |
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185 |
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186 protected static final int SEGMENT_MASK = CONCURRENCY_LEVEL - 1; |
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187 |
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188 /** |
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189 * Bookkeeping for each concurrency control segment. |
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190 * Each segment contains a local count of the number of |
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191 * elements in its region. |
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192 * However, the main use of a Segment is for its lock. |
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193 **/ |
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194 protected final static class Segment { |
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195 /** |
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196 * The number of elements in this segment's region. |
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197 * It is always updated within synchronized blocks. |
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198 **/ |
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199 protected int count; |
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200 |
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201 /** |
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202 * Get the count under synch. |
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203 **/ |
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204 protected synchronized int getCount() { return count; } |
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205 |
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206 /** |
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207 * Force a synchronization |
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208 **/ |
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209 protected synchronized void synch() {} |
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210 } |
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211 |
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212 /** |
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213 * The array of concurrency control segments. |
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214 **/ |
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215 |
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216 protected final Segment[] segments = new Segment[CONCURRENCY_LEVEL]; |
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217 |
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218 |
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219 /** |
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220 * The default initial number of table slots for this table (32). |
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221 * Used when not otherwise specified in constructor. |
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222 **/ |
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223 public static int DEFAULT_INITIAL_CAPACITY = 32; |
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224 |
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225 |
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226 /** |
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227 * The minimum capacity, used if a lower value is implicitly specified |
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228 * by either of the constructors with arguments. |
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229 * MUST be a power of two. |
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230 */ |
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231 private static final int MINIMUM_CAPACITY = 32; |
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232 |
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233 /** |
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234 * The maximum capacity, used if a higher value is implicitly specified |
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235 * by either of the constructors with arguments. |
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236 * MUST be a power of two <= 1<<30. |
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237 */ |
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238 private static final int MAXIMUM_CAPACITY = 1 << 30; |
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239 |
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240 /** |
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241 * The default load factor for this table (0.75) |
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242 * Used when not otherwise specified in constructor. |
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243 **/ |
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244 |
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245 public static final float DEFAULT_LOAD_FACTOR = 0.75f; |
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246 |
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247 /** |
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248 * The load factor for the hash table. |
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249 * |
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250 * @serial |
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251 */ |
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252 protected final float loadFactor; |
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253 |
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254 /** |
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255 * Per-segment resize threshold. |
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256 * |
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257 * @serial |
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258 */ |
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259 protected int threshold; |
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260 |
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261 |
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262 /** |
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263 * Number of segments voting for resize. The table is |
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264 * doubled when 1/4 of the segments reach threshold. |
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265 * Volatile but updated without synch since this is just a heuristic. |
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266 **/ |
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267 |
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268 protected transient volatile int votesForResize; |
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269 |
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270 |
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271 /** |
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272 * Return the number of set bits in w. |
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273 * For a derivation of this algorithm, see |
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274 * "Algorithms and data structures with applications to |
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275 * graphics and geometry", by Jurg Nievergelt and Klaus Hinrichs, |
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276 * Prentice Hall, 1993. |
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277 * See also notes by Torsten Sillke at |
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278 * http://www.mathematik.uni-bielefeld.de/~sillke/PROBLEMS/bitcount |
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279 **/ |
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280 protected static int bitcount(int w) { |
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281 w -= (0xaaaaaaaa & w) >>> 1; |
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282 w = (w & 0x33333333) + ((w >>> 2) & 0x33333333); |
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283 w = (w + (w >>> 4)) & 0x0f0f0f0f; |
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284 w += w >>> 8; |
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285 w += w >>> 16; |
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286 return w & 0xff; |
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287 } |
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288 |
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289 /** |
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290 * Returns the appropriate capacity (power of two) for the specified |
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291 * initial capacity argument. |
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292 */ |
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293 private int p2capacity(int initialCapacity) { |
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294 int cap = initialCapacity; |
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295 |
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296 // Compute the appropriate capacity |
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297 int result; |
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298 if (cap > MAXIMUM_CAPACITY || cap < 0) { |
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299 result = MAXIMUM_CAPACITY; |
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300 } else { |
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301 result = MINIMUM_CAPACITY; |
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302 while (result < cap) |
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303 result <<= 1; |
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304 } |
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305 return result; |
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306 } |
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307 |
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308 /** |
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309 * Return hash code for Object x. Since we are using power-of-two |
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310 * tables, it is worth the effort to improve hashcode via |
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311 * the same multiplicative scheme as used in IdentityHashMap. |
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312 */ |
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313 protected static int hash(Object x) { |
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314 int h = x.hashCode(); |
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315 // Multiply by 127 (quickly, via shifts), and mix in some high |
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316 // bits to help guard against bunching of codes that are |
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317 // consecutive or equally spaced. |
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318 return ((h << 7) - h + (h >>> 9) + (h >>> 17)); |
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319 } |
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320 |
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321 |
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322 /** |
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323 * Check for equality of non-null references x and y. |
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324 **/ |
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325 protected boolean eq(Object x, Object y) { |
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326 return x == y || x.equals(y); |
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327 } |
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328 |
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329 /** Create table array and set the per-segment threshold **/ |
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330 protected Entry[] newTable(int capacity) { |
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331 threshold = (int)(capacity * loadFactor / CONCURRENCY_LEVEL) + 1; |
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332 return new Entry[capacity]; |
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333 } |
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334 |
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335 /** |
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336 * Constructs a new, empty map with the specified initial |
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337 * capacity and the specified load factor. |
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338 * |
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339 * @param initialCapacity the initial capacity. |
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340 * The actual initial capacity is rounded to the nearest power of two. |
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341 * @param loadFactor the load factor threshold, used to control resizing. |
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342 * This value is used in an approximate way: When at least |
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343 * a quarter of the segments of the table reach per-segment threshold, or |
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344 * one of the segments itself exceeds overall threshold, |
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345 * the table is doubled. |
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346 * This will on average cause resizing when the table-wide |
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347 * load factor is slightly less than the threshold. If you'd like |
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348 * to avoid resizing, you can set this to a ridiculously large |
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349 * value. |
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350 * @throws IllegalArgumentException if the load factor is nonpositive. |
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351 */ |
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352 public ConcurrentHashMap(int initialCapacity, |
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353 float loadFactor) { |
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354 if (!(loadFactor > 0)) |
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355 throw new IllegalArgumentException("Illegal Load factor: "+ |
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356 loadFactor); |
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357 this.loadFactor = loadFactor; |
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358 for (int i = 0; i < segments.length; ++i) |
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359 segments[i] = new Segment(); |
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360 int cap = p2capacity(initialCapacity); |
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361 table = newTable(cap); |
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362 } |
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363 |
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364 /** |
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365 * Constructs a new, empty map with the specified initial |
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366 * capacity and default load factor. |
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367 * |
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368 * @param initialCapacity the initial capacity of the |
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369 * ConcurrentHashMap. |
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370 * @throws IllegalArgumentException if the initial maximum number |
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371 * of elements is less |
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372 * than zero. |
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373 */ |
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374 public ConcurrentHashMap(int initialCapacity) { |
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375 this(initialCapacity, DEFAULT_LOAD_FACTOR); |
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376 } |
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377 |
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378 /** |
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379 * Constructs a new, empty map with a default initial capacity |
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380 * and default load factor. |
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381 */ |
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382 public ConcurrentHashMap() { |
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383 this(DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR); |
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384 } |
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385 |
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386 /** |
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387 * Constructs a new map with the same mappings as the given map. The |
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388 * map is created with a capacity of twice the number of mappings in |
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389 * the given map or 32 (whichever is greater), and a default load factor. |
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390 */ |
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391 public ConcurrentHashMap(Map t) { |
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392 this(Math.max((int) (t.size() / DEFAULT_LOAD_FACTOR) + 1, |
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393 MINIMUM_CAPACITY), |
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394 DEFAULT_LOAD_FACTOR); |
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395 putAll(t); |
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396 } |
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397 |
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398 /** |
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399 * Returns the number of key-value mappings in this map. |
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400 * |
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401 * @return the number of key-value mappings in this map. |
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402 */ |
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403 public int size() { |
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404 int c = 0; |
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405 for (int i = 0; i < segments.length; ++i) |
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406 c += segments[i].getCount(); |
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407 return c; |
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408 } |
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409 |
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410 /** |
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411 * Returns <tt>true</tt> if this map contains no key-value mappings. |
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412 * |
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413 * @return <tt>true</tt> if this map contains no key-value mappings. |
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414 */ |
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415 public boolean isEmpty() { |
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416 for (int i = 0; i < segments.length; ++i) |
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417 if (segments[i].getCount() != 0) |
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418 return false; |
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419 return true; |
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420 } |
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421 |
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422 |
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423 /** |
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424 * Returns the value to which the specified key is mapped in this table. |
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425 * |
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426 * @param key a key in the table. |
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427 * @return the value to which the key is mapped in this table; |
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428 * <code>null</code> if the key is not mapped to any value in |
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429 * this table. |
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430 * @exception NullPointerException if the key is |
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431 * <code>null</code>. |
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432 * @see #put(Object, Object) |
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433 */ |
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434 public Object get(Object key) { |
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435 int hash = hash(key); // throws null pointer exception if key null |
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436 |
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437 // Try first without locking... |
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438 Entry[] tab = table; |
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439 int index = hash & (tab.length - 1); |
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440 Entry first = tab[index]; |
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441 Entry e; |
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442 |
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443 for (e = first; e != null; e = e.next) { |
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444 if (e.hash == hash && eq(key, e.key)) { |
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445 Object value = e.value; |
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446 if (value != null) |
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447 return value; |
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448 else |
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449 break; |
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450 } |
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451 } |
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452 |
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453 // Recheck under synch if key apparently not there or interference |
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454 Segment seg = segments[hash & SEGMENT_MASK]; |
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455 synchronized(seg) { |
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456 tab = table; |
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457 index = hash & (tab.length - 1); |
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458 Entry newFirst = tab[index]; |
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459 if (e != null || first != newFirst) { |
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460 for (e = newFirst; e != null; e = e.next) { |
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461 if (e.hash == hash && eq(key, e.key)) |
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462 return e.value; |
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463 } |
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464 } |
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465 return null; |
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466 } |
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467 } |
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468 |
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469 /** |
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470 * Tests if the specified object is a key in this table. |
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471 * |
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472 * @param key possible key. |
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473 * @return <code>true</code> if and only if the specified object |
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474 * is a key in this table, as determined by the |
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475 * <tt>equals</tt> method; <code>false</code> otherwise. |
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476 * @exception NullPointerException if the key is |
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477 * <code>null</code>. |
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478 * @see #contains(Object) |
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479 */ |
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480 |
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481 public boolean containsKey(Object key) { |
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482 return get(key) != null; |
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483 } |
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484 |
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485 |
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486 /** |
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487 * Maps the specified <code>key</code> to the specified |
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488 * <code>value</code> in this table. Neither the key nor the |
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489 * value can be <code>null</code>. (Note that this policy is |
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490 * the same as for java.util.Hashtable, but unlike java.util.HashMap, |
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491 * which does accept nulls as valid keys and values.)<p> |
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492 * |
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493 * The value can be retrieved by calling the <code>get</code> method |
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494 * with a key that is equal to the original key. |
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495 * |
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496 * @param key the table key. |
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497 * @param value the value. |
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498 * @return the previous value of the specified key in this table, |
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499 * or <code>null</code> if it did not have one. |
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500 * @exception NullPointerException if the key or value is |
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501 * <code>null</code>. |
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502 * @see Object#equals(Object) |
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503 * @see #get(Object) |
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504 */ |
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505 public Object put(Object key, Object value) { |
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506 if (value == null) |
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507 throw new NullPointerException(); |
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508 |
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509 int hash = hash(key); |
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510 Segment seg = segments[hash & SEGMENT_MASK]; |
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511 int segcount; |
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512 Entry[] tab; |
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513 int votes; |
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514 |
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515 synchronized(seg) { |
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516 tab = table; |
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517 int index = hash & (tab.length-1); |
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518 Entry first = tab[index]; |
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519 |
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520 for (Entry e = first; e != null; e = e.next) { |
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521 if (e.hash == hash && eq(key, e.key)) { |
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522 Object oldValue = e.value; |
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523 e.value = value; |
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524 return oldValue; |
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525 } |
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526 } |
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527 |
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528 // Add to front of list |
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529 Entry newEntry = new Entry(hash, key, value, first); |
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530 tab[index] = newEntry; |
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531 |
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532 if ((segcount = ++seg.count) < threshold) |
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533 return null; |
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534 |
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535 int bit = (1 << (hash & SEGMENT_MASK)); |
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536 votes = votesForResize; |
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537 if ((votes & bit) == 0) |
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538 votes = votesForResize |= bit; |
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539 } |
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540 |
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541 // Attempt resize if 1/4 segs vote, |
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542 // or if this seg itself reaches the overall threshold. |
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543 // (The latter check is just a safeguard to avoid pathological cases.) |
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544 if (bitcount(votes) >= CONCURRENCY_LEVEL / 4 || |
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545 segcount > (threshold * CONCURRENCY_LEVEL)) |
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546 resize(0, tab); |
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547 |
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548 return null; |
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|
549 } |
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550 |
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551 /** |
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parents:
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552 * Gather all locks in order to call rehash, by |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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553 * recursing within synch blocks for each segment index. |
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parents:
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|
554 * @param index the current segment. initially call value must be 0 |
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parents:
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555 * @param assumedTab the state of table on first call to resize. If |
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parents:
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556 * this changes on any call, the attempt is aborted because the |
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parents:
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557 * table has already been resized by another thread. |
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558 */ |
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|
559 |
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parents:
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|
560 protected void resize(int index, Entry[] assumedTab) { |
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561 Segment seg = segments[index]; |
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562 synchronized(seg) { |
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563 if (assumedTab == table) { |
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564 int next = index+1; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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565 if (next < segments.length) |
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parents:
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|
566 resize(next, assumedTab); |
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567 else |
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|
568 rehash(); |
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569 } |
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|
570 } |
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parents:
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571 } |
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|
572 |
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573 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
574 * Rehashes the contents of this map into a new table |
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Dan Creswell <dan.creswell@gmail.com>
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|
575 * with a larger capacity. |
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parents:
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|
576 */ |
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parents:
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|
577 protected void rehash() { |
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578 votesForResize = 0; // reset |
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|
579 |
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580 Entry[] oldTable = table; |
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581 int oldCapacity = oldTable.length; |
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|
582 |
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|
583 if (oldCapacity >= MAXIMUM_CAPACITY) { |
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parents:
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584 threshold = Integer.MAX_VALUE; // avoid retriggering |
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|
585 return; |
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|
586 } |
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|
587 |
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588 int newCapacity = oldCapacity << 1; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
589 Entry[] newTable = newTable(newCapacity); |
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parents:
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590 int mask = newCapacity - 1; |
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parents:
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|
591 |
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|
592 /* |
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parents:
diff
changeset
|
593 * Reclassify nodes in each list to new Map. Because we are |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
594 * using power-of-two expansion, the elements from each bin |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
595 * must either stay at same index, or move to |
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596 * oldCapacity+index. We also eliminate unnecessary node |
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597 * creation by catching cases where old nodes can be reused |
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598 * because their next fields won't change. Statistically, at |
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599 * the default threshhold, only about one-sixth of them need |
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600 * cloning. (The nodes they replace will be garbage |
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601 * collectable as soon as they are no longer referenced by any |
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602 * reader thread that may be in the midst of traversing table |
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603 * right now.) |
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604 */ |
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605 |
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606 for (int i = 0; i < oldCapacity ; i++) { |
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607 // We need to guarantee that any existing reads of old Map can |
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608 // proceed. So we cannot yet null out each bin. |
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609 Entry e = oldTable[i]; |
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610 |
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611 if (e != null) { |
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612 int idx = e.hash & mask; |
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613 Entry next = e.next; |
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|
614 |
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615 // Single node on list |
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616 if (next == null) |
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617 newTable[idx] = e; |
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618 |
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619 else { |
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620 // Reuse trailing consecutive sequence of all same bit |
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621 Entry lastRun = e; |
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622 int lastIdx = idx; |
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623 for (Entry last = next; last != null; last = last.next) { |
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624 int k = last.hash & mask; |
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625 if (k != lastIdx) { |
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626 lastIdx = k; |
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627 lastRun = last; |
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628 } |
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629 } |
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630 newTable[lastIdx] = lastRun; |
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631 |
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632 // Clone all remaining nodes |
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633 for (Entry p = e; p != lastRun; p = p.next) { |
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634 int k = p.hash & mask; |
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635 newTable[k] = new Entry(p.hash, p.key, |
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636 p.value, newTable[k]); |
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637 } |
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638 } |
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639 } |
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640 } |
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641 |
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642 table = newTable; |
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643 } |
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644 |
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645 |
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646 /** |
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647 * Removes the key (and its corresponding value) from this |
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parents:
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648 * table. This method does nothing if the key is not in the table. |
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649 * |
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650 * @param key the key that needs to be removed. |
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651 * @return the value to which the key had been mapped in this table, |
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Dan Creswell <dan.creswell@gmail.com>
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652 * or <code>null</code> if the key did not have a mapping. |
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|
653 * @exception NullPointerException if the key is |
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654 * <code>null</code>. |
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655 */ |
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656 public Object remove(Object key) { |
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657 return remove(key, null); |
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658 } |
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659 |
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660 |
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661 /** |
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662 * Removes the (key, value) pair from this |
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parents:
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663 * table. This method does nothing if the key is not in the table, |
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parents:
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664 * or if the key is associated with a different value. This method |
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665 * is needed by EntrySet. |
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666 * |
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667 * @param key the key that needs to be removed. |
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parents:
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668 * @param value the associated value. If the value is null, |
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669 * it means "any value". |
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670 * @return the value to which the key had been mapped in this table, |
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671 * or <code>null</code> if the key did not have a mapping. |
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672 * @exception NullPointerException if the key is |
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673 * <code>null</code>. |
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674 */ |
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675 |
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676 protected Object remove(Object key, Object value) { |
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677 /* |
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678 Find the entry, then |
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679 1. Set value field to null, to force get() to retry |
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680 2. Rebuild the list without this entry. |
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681 All entries following removed node can stay in list, but |
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682 all preceeding ones need to be cloned. Traversals rely |
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683 on this strategy to ensure that elements will not be |
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684 repeated during iteration. |
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685 */ |
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686 |
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687 int hash = hash(key); |
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688 Segment seg = segments[hash & SEGMENT_MASK]; |
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689 |
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690 synchronized(seg) { |
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691 Entry[] tab = table; |
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692 int index = hash & (tab.length-1); |
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693 Entry first = tab[index]; |
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694 Entry e = first; |
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695 |
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696 for (;;) { |
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697 if (e == null) |
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698 return null; |
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699 if (e.hash == hash && eq(key, e.key)) |
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700 break; |
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701 e = e.next; |
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702 } |
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703 |
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704 Object oldValue = e.value; |
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705 if (value != null && !value.equals(oldValue)) |
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706 return null; |
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707 |
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708 e.value = null; |
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709 |
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710 Entry head = e.next; |
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711 for (Entry p = first; p != e; p = p.next) |
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712 head = new Entry(p.hash, p.key, p.value, head); |
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713 tab[index] = head; |
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714 seg.count--; |
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|
715 return oldValue; |
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716 } |
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|
717 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
718 |
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|
719 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
720 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
721 * Returns <tt>true</tt> if this map maps one or more keys to the |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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722 * specified value. Note: This method requires a full internal |
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parents:
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723 * traversal of the hash table, and so is much slower than |
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parents:
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|
724 * method <tt>containsKey</tt>. |
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|
725 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
726 * @param value value whose presence in this map is to be tested. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
727 * @return <tt>true</tt> if this map maps one or more keys to the |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
728 * specified value. |
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parents:
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|
729 * @exception NullPointerException if the value is <code>null</code>. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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730 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
731 public boolean containsValue(Object value) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
732 |
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parents:
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|
733 if (value == null) throw new NullPointerException(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
734 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
735 for (int s = 0; s < segments.length; ++s) { |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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736 Segment seg = segments[s]; |
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Dan Creswell <dan.creswell@gmail.com>
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737 Entry[] tab; |
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738 synchronized(seg) { tab = table; } |
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parents:
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739 for (int i = s; i < tab.length; i+= segments.length) { |
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parents:
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740 for (Entry e = tab[i]; e != null; e = e.next) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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741 if (value.equals(e.value)) |
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742 return true; |
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|
743 } |
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|
744 } |
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|
745 return false; |
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|
746 } |
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|
747 |
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changeset
|
748 /** |
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|
749 * Tests if some key maps into the specified value in this table. |
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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
|
750 * This operation is more expensive than the <code>containsKey</code> |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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751 * method.<p> |
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parents:
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|
752 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
753 * Note that this method is identical in functionality to containsValue, |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
754 * (which is part of the Map interface in the collections framework). |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
755 * |
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parents:
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|
756 * @param value a value to search for. |
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parents:
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changeset
|
757 * @return <code>true</code> if and only if some key maps to the |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
758 * <code>value</code> argument in this table as |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
759 * determined by the <tt>equals</tt> method; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
760 * <code>false</code> otherwise. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
761 * @exception NullPointerException if the value is <code>null</code>. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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762 * @see #containsKey(Object) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
763 * @see #containsValue(Object) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
764 * @see Map |
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changeset
|
765 */ |
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|
766 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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diff
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|
767 public boolean contains(Object value) { |
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parents:
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changeset
|
768 return containsValue(value); |
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parents:
diff
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|
769 } |
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|
770 |
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parents:
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changeset
|
771 /** |
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parents:
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changeset
|
772 * Copies all of the mappings from the specified map to this one. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
773 * |
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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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|
774 * These mappings replace any mappings that this map had for any of the |
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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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|
775 * keys currently in the specified Map. |
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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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|
776 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
777 * @param t Mappings to be stored in this map. |
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|
778 */ |
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|
779 |
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780 public void putAll(Map t) { |
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781 int n = t.size(); |
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782 if (n == 0) |
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|
783 return; |
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|
784 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
785 // Expand enough to hold at least n elements without resizing. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
786 // We can only resize table by factor of two at a time. |
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|
787 // It is faster to rehash with fewer elements, so do it now. |
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|
788 for(;;) { |
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parents:
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|
789 Entry[] tab; |
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|
790 int max; |
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|
791 synchronized(segments[0]) { // must synch on some segment. pick 0. |
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792 tab = table; |
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793 max = threshold * CONCURRENCY_LEVEL; |
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794 } |
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|
795 if (n < max) |
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|
796 break; |
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|
797 resize(0, tab); |
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|
798 } |
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|
799 |
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800 for (Iterator it = t.entrySet().iterator(); it.hasNext();) { |
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801 Map.Entry entry = (Map.Entry) it.next(); |
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802 put(entry.getKey(), entry.getValue()); |
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parents:
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|
803 } |
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|
804 } |
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changeset
|
805 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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changeset
|
806 /** |
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changeset
|
807 * Removes all mappings from this map. |
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parents:
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changeset
|
808 */ |
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|
809 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
810 public void clear() { |
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811 // We don't need all locks at once so long as locks |
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changeset
|
812 // are obtained in low to high order |
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changeset
|
813 for (int s = 0; s < segments.length; ++s) { |
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changeset
|
814 Segment seg = segments[s]; |
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|
815 synchronized(seg) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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changeset
|
816 Entry[] tab = table; |
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|
817 for (int i = s; i < tab.length; i+= segments.length) { |
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|
818 for (Entry e = tab[i]; e != null; e = e.next) |
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|
819 e.value = null; |
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|
820 tab[i] = null; |
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|
821 seg.count = 0; |
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|
822 } |
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|
823 } |
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|
824 } |
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|
825 } |
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|
826 |
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parents:
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|
827 /** |
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changeset
|
828 * Returns a shallow copy of this |
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parents:
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changeset
|
829 * <tt>ConcurrentHashMap</tt> instance: the keys and |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
830 * values themselves are not cloned. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
831 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
832 * @return a shallow copy of this map. |
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parents:
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changeset
|
833 */ |
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changeset
|
834 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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835 public Object clone() { |
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836 // We cannot call super.clone, since it would share final segments array, |
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837 // and there's no way to reassign finals. |
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838 return new ConcurrentHashMap(this); |
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839 } |
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840 |
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841 // Views |
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842 |
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843 protected transient Set keySet = null; |
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844 protected transient Set entrySet = null; |
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845 protected transient Collection values = null; |
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846 |
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847 /** |
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848 * Returns a set view of the keys contained in this map. The set is |
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849 * backed by the map, so changes to the map are reflected in the set, and |
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850 * vice-versa. The set supports element removal, which removes the |
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851 * corresponding mapping from this map, via the <tt>Iterator.remove</tt>, |
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852 * <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt>, and |
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853 * <tt>clear</tt> operations. It does not support the <tt>add</tt> or |
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854 * <tt>addAll</tt> operations. |
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855 * |
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856 * @return a set view of the keys contained in this map. |
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857 */ |
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858 |
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859 public Set keySet() { |
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860 Set ks = keySet; |
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861 return (ks != null)? ks : (keySet = new KeySet()); |
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862 } |
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863 |
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864 private class KeySet extends AbstractSet { |
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865 public Iterator iterator() { |
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866 return new KeyIterator(); |
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867 } |
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868 public int size() { |
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869 return ConcurrentHashMap.this.size(); |
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870 } |
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871 public boolean contains(Object o) { |
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872 return ConcurrentHashMap.this.containsKey(o); |
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873 } |
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874 public boolean remove(Object o) { |
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875 return ConcurrentHashMap.this.remove(o) != null; |
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876 } |
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877 public void clear() { |
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878 ConcurrentHashMap.this.clear(); |
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879 } |
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880 } |
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881 |
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882 /** |
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883 * Returns a collection view of the values contained in this map. The |
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884 * collection is backed by the map, so changes to the map are reflected in |
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885 * the collection, and vice-versa. The collection supports element |
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886 * removal, which removes the corresponding mapping from this map, via the |
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887 * <tt>Iterator.remove</tt>, <tt>Collection.remove</tt>, |
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888 * <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> operations. |
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889 * It does not support the <tt>add</tt> or <tt>addAll</tt> operations. |
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890 * |
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891 * @return a collection view of the values contained in this map. |
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892 */ |
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|
893 |
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|
894 public Collection values() { |
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895 Collection vs = values; |
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896 return (vs != null)? vs : (values = new Values()); |
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897 } |
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898 |
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899 private class Values extends AbstractCollection { |
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900 public Iterator iterator() { |
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901 return new ValueIterator(); |
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|
902 } |
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903 public int size() { |
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|
904 return ConcurrentHashMap.this.size(); |
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|
905 } |
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parents:
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|
906 public boolean contains(Object o) { |
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907 return ConcurrentHashMap.this.containsValue(o); |
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|
908 } |
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909 public void clear() { |
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|
910 ConcurrentHashMap.this.clear(); |
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911 } |
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|
912 } |
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|
913 |
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|
914 /** |
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|
915 * Returns a collection view of the mappings contained in this map. Each |
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parents:
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|
916 * element in the returned collection is a <tt>Map.Entry</tt>. The |
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|
917 * collection is backed by the map, so changes to the map are reflected in |
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parents:
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|
918 * the collection, and vice-versa. The collection supports element |
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parents:
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|
919 * removal, which removes the corresponding mapping from the map, via the |
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parents:
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|
920 * <tt>Iterator.remove</tt>, <tt>Collection.remove</tt>, |
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|
921 * <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> operations. |
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|
922 * It does not support the <tt>add</tt> or <tt>addAll</tt> operations. |
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923 * |
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924 * @return a collection view of the mappings contained in this map. |
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|
925 */ |
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|
926 |
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|
927 public Set entrySet() { |
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928 Set es = entrySet; |
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|
929 return (es != null) ? es : (entrySet = new EntrySet()); |
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|
930 } |
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|
931 |
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|
932 private class EntrySet extends AbstractSet { |
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|
933 public Iterator iterator() { |
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|
934 return new HashIterator(); |
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|
935 } |
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|
936 public boolean contains(Object o) { |
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|
937 if (!(o instanceof Map.Entry)) |
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|
938 return false; |
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|
939 Map.Entry entry = (Map.Entry)o; |
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940 Object v = ConcurrentHashMap.this.get(entry.getKey()); |
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941 return v != null && v.equals(entry.getValue()); |
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|
942 } |
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|
943 public boolean remove(Object o) { |
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|
944 if (!(o instanceof Map.Entry)) |
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|
945 return false; |
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|
946 Map.Entry e = (Map.Entry)o; |
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|
947 return ConcurrentHashMap.this.remove(e.getKey(), e.getValue()) != null; |
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|
948 } |
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|
949 public int size() { |
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|
950 return ConcurrentHashMap.this.size(); |
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|
951 } |
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|
952 public void clear() { |
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953 ConcurrentHashMap.this.clear(); |
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954 } |
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955 } |
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956 |
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957 /** |
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958 * Returns an enumeration of the keys in this table. |
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959 * |
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960 * @return an enumeration of the keys in this table. |
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961 * @see Enumeration |
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962 * @see #elements() |
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963 * @see #keySet() |
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964 * @see Map |
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965 */ |
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966 public Enumeration keys() { |
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967 return new KeyIterator(); |
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968 } |
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969 |
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970 /** |
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971 * Returns an enumeration of the values in this table. |
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972 * Use the Enumeration methods on the returned object to fetch the elements |
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973 * sequentially. |
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974 * |
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975 * @return an enumeration of the values in this table. |
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976 * @see java.util.Enumeration |
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977 * @see #keys() |
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978 * @see #values() |
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979 * @see Map |
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980 */ |
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981 |
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982 public Enumeration elements() { |
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983 return new ValueIterator(); |
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984 } |
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985 |
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986 /** |
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987 * ConcurrentHashMap collision list entry. |
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988 */ |
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989 |
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990 protected static class Entry implements Map.Entry { |
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991 /* |
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992 The use of volatile for value field ensures that |
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993 we can detect status changes without synchronization. |
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994 The other fields are never changed, and are |
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995 marked as final. |
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996 */ |
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997 |
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998 protected final Object key; |
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999 protected volatile Object value; |
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1000 protected final int hash; |
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1001 protected final Entry next; |
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1002 |
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1003 Entry(int hash, Object key, Object value, Entry next) { |
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1004 this.value = value; |
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1005 this.hash = hash; |
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1006 this.key = key; |
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1007 this.next = next; |
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1008 } |
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1009 |
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1010 // Map.Entry Ops |
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1011 |
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1012 public Object getKey() { |
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1013 return key; |
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1014 } |
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1015 |
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1016 /** |
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1017 * Get the value. Note: In an entrySet or entrySet.iterator, |
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1018 * unless you can guarantee lack of concurrent modification, |
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1019 * <tt>getValue</tt> <em>might</em> return null, reflecting the |
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1020 * fact that the entry has been concurrently removed. However, |
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1021 * there are no assurances that concurrent removals will be |
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1022 * reflected using this method. |
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1023 * |
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1024 * @return the current value, or null if the entry has been |
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1025 * detectably removed. |
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1026 **/ |
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1027 public Object getValue() { |
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1028 return value; |
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1029 } |
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1030 |
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1031 /** |
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1032 * Set the value of this entry. Note: In an entrySet or |
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1033 * entrySet.iterator), unless you can guarantee lack of concurrent |
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1034 * modification, <tt>setValue</tt> is not strictly guaranteed to |
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1035 * actually replace the value field obtained via the <tt>get</tt> |
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1036 * operation of the underlying hash table in multithreaded |
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1037 * applications. If iterator-wide synchronization is not used, |
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1038 * and any other concurrent <tt>put</tt> or <tt>remove</tt> |
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1039 * operations occur, sometimes even to <em>other</em> entries, |
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1040 * then this change is not guaranteed to be reflected in the hash |
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1041 * table. (It might, or it might not. There are no assurances |
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1042 * either way.) |
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1043 * |
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1044 * @param value the new value. |
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1045 * @return the previous value, or null if entry has been detectably |
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1046 * removed. |
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1047 * @exception NullPointerException if the value is <code>null</code>. |
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1048 * |
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1049 **/ |
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1050 |
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1051 public Object setValue(Object value) { |
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1052 if (value == null) |
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1053 throw new NullPointerException(); |
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1054 Object oldValue = this.value; |
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1055 this.value = value; |
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1056 return oldValue; |
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1057 } |
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1058 |
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1059 public boolean equals(Object o) { |
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1060 if (!(o instanceof Map.Entry)) |
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1061 return false; |
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1062 Map.Entry e = (Map.Entry)o; |
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1063 return (key.equals(e.getKey()) && value.equals(e.getValue())); |
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1064 } |
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1065 |
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1066 public int hashCode() { |
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1067 return key.hashCode() ^ value.hashCode(); |
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1068 } |
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1069 |
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1070 public String toString() { |
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1071 return key + "=" + value; |
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1072 } |
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1073 |
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1074 } |
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|
1075 |
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1076 protected class HashIterator implements Iterator, Enumeration { |
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1077 protected final Entry[] tab; // snapshot of table |
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1078 protected int index; // current slot |
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|
1079 protected Entry entry = null; // current node of slot |
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1080 protected Object currentKey; // key for current node |
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1081 protected Object currentValue; // value for current node |
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1082 protected Entry lastReturned = null; // last node returned by next |
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1083 |
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|
1084 protected HashIterator() { |
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|
1085 // force all segments to synch |
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1086 synchronized(segments[0]) { tab = table; } |
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|
1087 for (int i = 1; i < segments.length; ++i) segments[i].synch(); |
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1088 index = tab.length - 1; |
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1089 } |
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|
1090 |
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1091 public boolean hasMoreElements() { return hasNext(); } |
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1092 public Object nextElement() { return next(); } |
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1093 |
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1094 public boolean hasNext() { |
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1095 /* |
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1096 currentkey and currentValue are set here to ensure that next() |
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1097 returns normally if hasNext() returns true. This avoids |
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1098 surprises especially when final element is removed during |
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1099 traversal -- instead, we just ignore the removal during |
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1100 current traversal. |
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1101 */ |
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1102 |
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1103 for (;;) { |
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1104 if (entry != null) { |
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1105 Object v = entry.value; |
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1106 if (v != null) { |
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1107 currentKey = entry.key; |
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1108 currentValue = v; |
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1109 return true; |
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|
1110 } |
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1111 else |
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1112 entry = entry.next; |
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1113 } |
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1114 |
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1115 while (entry == null && index >= 0) |
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1116 entry = tab[index--]; |
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1117 |
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1118 if (entry == null) { |
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1119 currentKey = currentValue = null; |
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1120 return false; |
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1121 } |
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1122 } |
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|
1123 } |
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1124 |
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1125 protected Object returnValueOfNext() { return entry; } |
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1126 |
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|
1127 public Object next() { |
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1128 if (currentKey == null && !hasNext()) |
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1129 throw new NoSuchElementException(); |
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1130 |
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1131 Object result = returnValueOfNext(); |
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1132 lastReturned = entry; |
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1133 currentKey = currentValue = null; |
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1134 entry = entry.next; |
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1135 return result; |
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|
1136 } |
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|
1137 |
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|
1138 public void remove() { |
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parents:
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|
1139 if (lastReturned == null) |
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parents:
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|
1140 throw new IllegalStateException(); |
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1141 ConcurrentHashMap.this.remove(lastReturned.key); |
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|
1142 lastReturned = null; |
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|
1143 } |
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parents:
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|
1144 |
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|
1145 } |
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|
1146 |
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parents:
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|
1147 protected class KeyIterator extends HashIterator { |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
1148 protected Object returnValueOfNext() { return currentKey; } |
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|
1149 } |
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|
1150 |
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parents:
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|
1151 protected class ValueIterator extends HashIterator { |
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parents:
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|
1152 protected Object returnValueOfNext() { return currentValue; } |
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parents:
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|
1153 } |
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parents:
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|
1154 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
1155 /** |
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|
1156 * Save the state of the <tt>ConcurrentHashMap</tt> |
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parents:
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|
1157 * instance to a stream (i.e., |
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|
1158 * serialize it). |
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|
1159 * |
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|
1160 * @serialData |
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|
1161 * An estimate of the table size, followed by |
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|
1162 * the key (Object) and value (Object) |
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|
1163 * for each key-value mapping, followed by a null pair. |
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parents:
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|
1164 * The key-value mappings are emitted in no particular order. |
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parents:
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|
1165 */ |
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parents:
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|
1166 |
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parents:
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|
1167 private void writeObject(java.io.ObjectOutputStream s) |
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parents:
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|
1168 throws IOException { |
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|
1169 // Write out the loadfactor, and any hidden stuff |
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|
1170 s.defaultWriteObject(); |
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|
1171 |
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|
1172 // Write out capacity estimate. It is OK if this |
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|
1173 // changes during the write, since it is only used by |
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parents:
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|
1174 // readObject to set initial capacity, to avoid needless resizings. |
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|
1175 |
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|
1176 int cap; |
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|
1177 synchronized(segments[0]) { cap = table.length; } |
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|
1178 s.writeInt(cap); |
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|
1179 |
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|
1180 // Write out keys and values (alternating) |
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|
1181 for (int k = 0; k < segments.length; ++k) { |
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|
1182 Segment seg = segments[k]; |
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|
1183 Entry[] tab; |
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|
1184 synchronized(seg) { tab = table; } |
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|
1185 for (int i = k; i < tab.length; i+= segments.length) { |
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|
1186 for (Entry e = tab[i]; e != null; e = e.next) { |
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|
1187 s.writeObject(e.key); |
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parents:
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|
1188 s.writeObject(e.value); |
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parents:
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|
1189 } |
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changeset
|
1190 } |
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|
1191 } |
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|
1192 |
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1193 s.writeObject(null); |
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1194 s.writeObject(null); |
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1195 } |
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1196 |
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1197 /** |
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1198 * Reconstitute the <tt>ConcurrentHashMap</tt> |
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1199 * instance from a stream (i.e., |
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1200 * deserialize it). |
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1201 */ |
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1202 private void readObject(java.io.ObjectInputStream s) |
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1203 throws IOException, ClassNotFoundException { |
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1204 // Read in the threshold, loadfactor, and any hidden stuff |
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1205 s.defaultReadObject(); |
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1206 |
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1207 int cap = s.readInt(); |
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1208 table = newTable(cap); |
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1209 for (int i = 0; i < segments.length; ++i) |
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1210 segments[i] = new Segment(); |
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1211 |
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1212 |
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1213 // Read the keys and values, and put the mappings in the table |
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1214 for (;;) { |
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1215 Object key = s.readObject(); |
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1216 Object value = s.readObject(); |
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1217 if (key == null) |
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1218 break; |
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1219 put(key, value); |
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1220 } |
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1221 } |
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1222 } |