Mercurial > hg > blitz_condensed
annotate src/EDU/oswego/cs/dl/util/concurrent/ConcurrentReaderHashMap.java @ 34:6f68e94c1fb8 default tip
Add CondensedStats monitoring utility, equivalent to vmstat
author | Dominic Cleal <dominic-cleal@cdo2.com> |
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date | Thu, 05 Aug 2010 11:07:25 +0100 |
parents | 3dc0c5604566 |
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1 /* |
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2 File: ConcurrentReaderHashMap |
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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 28oct1999 dl Created |
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20 14dec1999 dl jmm snapshot |
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21 19apr2000 dl use barrierLock |
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22 12jan2001 dl public release |
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23 17nov2001 dl Minor tunings |
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24 20may2002 dl BarrierLock can now be serialized. |
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25 09dec2002 dl Fix interference checks. |
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26 */ |
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27 |
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28 package EDU.oswego.cs.dl.util.concurrent; |
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29 |
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30 import java.util.Map; |
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31 import java.util.AbstractMap; |
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32 import java.util.AbstractSet; |
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33 import java.util.AbstractCollection; |
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34 import java.util.Collection; |
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35 import java.util.Set; |
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36 import java.util.Iterator; |
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37 import java.util.Enumeration; |
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38 import java.util.ConcurrentModificationException; |
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39 import java.util.NoSuchElementException; |
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40 |
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41 import java.io.Serializable; |
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42 import java.io.IOException; |
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43 import java.io.ObjectInputStream; |
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44 import java.io.ObjectOutputStream; |
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45 |
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46 |
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47 /** |
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48 * A version of Hashtable that supports mostly-concurrent reading, but |
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49 * exclusive writing. Because reads are not limited to periods |
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50 * without writes, a concurrent reader policy is weaker than a classic |
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51 * reader/writer policy, but is generally faster and allows more |
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52 * concurrency. This class is a good choice especially for tables that |
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53 * are mainly created by one thread during the start-up phase of a |
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54 * program, and from then on, are mainly read (with perhaps occasional |
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55 * additions or removals) in many threads. If you also need concurrency |
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56 * among writes, consider instead using ConcurrentHashMap. |
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57 * <p> |
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58 * |
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59 * Successful retrievals using get(key) and containsKey(key) usually |
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60 * run without locking. Unsuccessful ones (i.e., when the key is not |
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61 * present) do involve brief synchronization (locking). Also, the |
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62 * size and isEmpty methods are always synchronized. |
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63 * |
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64 * <p> Because retrieval operations can ordinarily overlap with |
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65 * writing operations (i.e., put, remove, and their derivatives), |
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66 * retrievals can only be guaranteed to return the results of the most |
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67 * recently <em>completed</em> operations holding upon their |
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68 * onset. Retrieval operations may or may not return results |
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69 * reflecting in-progress writing operations. However, the retrieval |
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70 * operations do always return consistent results -- either those |
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71 * holding before any single modification or after it, but never a |
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72 * nonsense result. For aggregate operations such as putAll and |
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73 * clear, concurrent reads may reflect insertion or removal of only |
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74 * some entries. In those rare contexts in which you use a hash table |
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75 * to synchronize operations across threads (for example, to prevent |
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76 * reads until after clears), you should either encase operations |
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77 * in synchronized blocks, or instead use java.util.Hashtable. |
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78 * |
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79 * <p> |
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80 * |
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81 * This class also supports optional guaranteed |
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82 * exclusive reads, simply by surrounding a call within a synchronized |
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83 * block, as in <br> |
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84 * <code>ConcurrentReaderHashMap t; ... Object v; <br> |
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85 * synchronized(t) { v = t.get(k); } </code> <br> |
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86 * |
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87 * But this is not usually necessary in practice. For |
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88 * example, it is generally inefficient to write: |
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89 * |
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90 * <pre> |
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91 * ConcurrentReaderHashMap t; ... // Inefficient version |
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92 * Object key; ... |
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93 * Object value; ... |
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94 * synchronized(t) { |
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95 * if (!t.containsKey(key)) |
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96 * t.put(key, value); |
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97 * // other code if not previously present |
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98 * } |
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99 * else { |
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100 * // other code if it was previously present |
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101 * } |
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102 * } |
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103 *</pre> |
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104 * Instead, if the values are intended to be the same in each case, just take advantage of the fact that put returns |
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105 * null if the key was not previously present: |
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106 * <pre> |
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107 * ConcurrentReaderHashMap t; ... // Use this instead |
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108 * Object key; ... |
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109 * Object value; ... |
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110 * Object oldValue = t.put(key, value); |
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111 * if (oldValue == null) { |
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112 * // other code if not previously present |
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113 * } |
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114 * else { |
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115 * // other code if it was previously present |
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116 * } |
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117 *</pre> |
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118 * <p> |
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119 * |
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120 * Iterators and Enumerations (i.e., those returned by |
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121 * keySet().iterator(), entrySet().iterator(), values().iterator(), |
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122 * keys(), and elements()) return elements reflecting the state of the |
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123 * hash table at some point at or since the creation of the |
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124 * iterator/enumeration. They will return at most one instance of |
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125 * each element (via next()/nextElement()), but might or might not |
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126 * reflect puts and removes that have been processed since they were |
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127 * created. They do <em>not</em> throw ConcurrentModificationException. |
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128 * However, these iterators are designed to be used by only one |
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129 * thread at a time. Sharing an iterator across multiple threads may |
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130 * lead to unpredictable results if the table is being concurrently |
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131 * modified. Again, you can ensure interference-free iteration by |
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132 * enclosing the iteration in a synchronized block. <p> |
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133 * |
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134 * This class may be used as a direct replacement for any use of |
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135 * java.util.Hashtable that does not depend on readers being blocked |
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136 * during updates. Like Hashtable but unlike java.util.HashMap, |
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137 * this class does NOT allow <tt>null</tt> to be used as a key or |
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138 * value. This class is also typically faster than ConcurrentHashMap |
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139 * when there is usually only one thread updating the table, but |
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140 * possibly many retrieving values from it. |
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141 * <p> |
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142 * |
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143 * Implementation note: A slightly faster implementation of |
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144 * this class will be possible once planned Java Memory Model |
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145 * revisions are in place. |
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146 * |
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147 * <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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148 |
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149 **/ |
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150 |
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151 |
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152 public class ConcurrentReaderHashMap |
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153 extends AbstractMap |
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154 implements Map, Cloneable, Serializable { |
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155 |
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156 |
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157 /* |
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158 The basic strategy is an optimistic-style scheme based on |
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159 the guarantee that the hash table and its lists are always |
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160 kept in a consistent enough state to be read without locking: |
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161 |
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162 * Read operations first proceed without locking, by traversing the |
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163 apparently correct list of the apparently correct bin. If an |
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164 entry is found, but not invalidated (value field null), it is |
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165 returned. If not found, operations must recheck (after a memory |
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166 barrier) to make sure they are using both the right list and |
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167 the right table (which can change under resizes). If |
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168 invalidated, reads must acquire main update lock to wait out |
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169 the update, and then re-traverse. |
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170 |
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171 * All list additions are at the front of each bin, making it easy |
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172 to check changes, and also fast to traverse. Entry next |
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173 pointers are never assigned. Remove() builds new nodes when |
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174 necessary to preserve this. |
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175 |
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176 * Remove() (also clear()) invalidates removed nodes to alert read |
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177 operations that they must wait out the full modifications. |
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178 |
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179 */ |
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180 |
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181 /** A Serializable class for barrier lock **/ |
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182 protected static class BarrierLock implements java.io.Serializable { } |
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183 |
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184 /** |
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185 * Lock used only for its memory effects. |
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186 **/ |
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187 protected final BarrierLock barrierLock = new BarrierLock(); |
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188 |
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189 /** |
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190 * field written to only to guarantee lock ordering. |
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191 **/ |
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192 |
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193 protected transient Object lastWrite; |
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194 |
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195 /** |
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196 * Force a memory synchronization that will cause |
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197 * all readers to see table. Call only when already |
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198 * holding main synch lock. |
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199 **/ |
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200 protected final void recordModification(Object x) { |
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201 synchronized(barrierLock) { |
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202 lastWrite = x; |
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203 } |
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204 } |
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205 |
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206 /** |
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207 * Get ref to table; the reference and the cells it |
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208 * accesses will be at least as fresh as from last |
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209 * use of barrierLock |
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210 **/ |
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211 protected final Entry[] getTableForReading() { |
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212 synchronized(barrierLock) { |
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213 return table; |
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214 } |
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215 } |
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216 |
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217 |
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218 /** |
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219 * The default initial number of table slots for this table (32). |
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220 * Used when not otherwise specified in constructor. |
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221 **/ |
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222 public static int DEFAULT_INITIAL_CAPACITY = 32; |
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223 |
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224 |
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225 /** |
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226 * The minimum capacity, used if a lower value is implicitly specified |
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227 * by either of the constructors with arguments. |
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228 * MUST be a power of two. |
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229 */ |
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230 private static final int MINIMUM_CAPACITY = 4; |
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231 |
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232 /** |
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233 * The maximum capacity, used if a higher value is implicitly specified |
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234 * by either of the constructors with arguments. |
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235 * MUST be a power of two <= 1<<30. |
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236 */ |
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237 private static final int MAXIMUM_CAPACITY = 1 << 30; |
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238 |
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239 /** |
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240 * The default load factor for this table (1.0). |
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241 * Used when not otherwise specified in constructor. |
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242 **/ |
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243 |
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244 public static final float DEFAULT_LOAD_FACTOR = 0.75f; |
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245 |
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246 |
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247 /** |
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248 * The hash table data. |
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249 */ |
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250 protected transient Entry[] table; |
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251 |
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252 /** |
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253 * The total number of mappings in the hash table. |
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254 */ |
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255 protected transient int count; |
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256 |
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257 /** |
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258 * The table is rehashed when its size exceeds this threshold. (The |
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259 * value of this field is always (int)(capacity * loadFactor).) |
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260 * |
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261 * @serial |
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262 */ |
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263 protected int threshold; |
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264 |
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265 /** |
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266 * The load factor for the hash table. |
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267 * |
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268 * @serial |
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269 */ |
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270 protected float loadFactor; |
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271 |
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272 /** |
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273 * Returns the appropriate capacity (power of two) for the specified |
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274 * initial capacity argument. |
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275 */ |
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276 private int p2capacity(int initialCapacity) { |
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277 int cap = initialCapacity; |
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278 |
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279 // Compute the appropriate capacity |
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280 int result; |
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281 if (cap > MAXIMUM_CAPACITY || cap < 0) { |
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282 result = MAXIMUM_CAPACITY; |
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283 } else { |
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284 result = MINIMUM_CAPACITY; |
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285 while (result < cap) |
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286 result <<= 1; |
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287 } |
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288 return result; |
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289 } |
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290 |
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291 /** |
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292 * Return hash code for Object x. Since we are using power-of-two |
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293 * tables, it is worth the effort to improve hashcode via |
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294 * the same multiplicative scheme as used in IdentityHashMap. |
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295 */ |
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296 private static int hash(Object x) { |
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297 int h = x.hashCode(); |
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298 // Multiply by 127 (quickly, via shifts), and mix in some high |
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299 // bits to help guard against bunching of codes that are |
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300 // consecutive or equally spaced. |
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301 return ((h << 7) - h + (h >>> 9) + (h >>> 17)); |
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302 } |
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303 |
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304 /** |
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305 * Check for equality of non-null references x and y. |
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306 **/ |
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307 protected boolean eq(Object x, Object y) { |
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308 return x == y || x.equals(y); |
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309 } |
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310 |
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311 /** |
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312 * Constructs a new, empty map with the specified initial |
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313 * capacity and the specified load factor. |
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314 * |
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315 * @param initialCapacity the initial capacity |
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316 * The actual initial capacity is rounded to the nearest power of two. |
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317 * @param loadFactor the load factor of the ConcurrentReaderHashMap |
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318 * @throws IllegalArgumentException if the initial maximum number |
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319 * of elements is less |
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320 * than zero, or if the load factor is nonpositive. |
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321 */ |
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322 |
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323 public ConcurrentReaderHashMap(int initialCapacity, float loadFactor) { |
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324 if (loadFactor <= 0) |
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325 throw new IllegalArgumentException("Illegal Load factor: "+ |
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326 loadFactor); |
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327 this.loadFactor = loadFactor; |
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328 |
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329 int cap = p2capacity(initialCapacity); |
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330 |
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331 table = new Entry[cap]; |
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332 threshold = (int)(cap * loadFactor); |
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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 default load factor. |
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338 * |
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339 * @param initialCapacity the initial capacity of the |
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340 * ConcurrentReaderHashMap. |
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341 * @throws IllegalArgumentException if the initial maximum number |
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342 * of elements is less |
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343 * than zero. |
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344 */ |
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345 |
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346 public ConcurrentReaderHashMap(int initialCapacity) { |
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347 this(initialCapacity, DEFAULT_LOAD_FACTOR); |
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348 } |
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349 |
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350 /** |
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351 * Constructs a new, empty map with a default initial capacity |
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352 * and load factor. |
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353 */ |
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354 |
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355 public ConcurrentReaderHashMap() { |
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356 this(DEFAULT_INITIAL_CAPACITY, DEFAULT_LOAD_FACTOR); |
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357 } |
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358 |
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359 /** |
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360 * Constructs a new map with the same mappings as the given map. The |
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361 * map is created with a capacity of twice the number of mappings in |
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362 * the given map or 16 (whichever is greater), and a default load factor. |
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363 */ |
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364 |
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365 public ConcurrentReaderHashMap(Map t) { |
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366 this(Math.max((int) (t.size() / DEFAULT_LOAD_FACTOR) + 1, 16), |
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367 DEFAULT_LOAD_FACTOR); |
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368 putAll(t); |
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369 } |
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370 |
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371 /** |
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372 * Returns the number of key-value mappings in this map. |
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373 * |
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374 * @return the number of key-value mappings in this map. |
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375 */ |
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376 |
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377 public synchronized int size() { |
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378 return count; |
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379 } |
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380 |
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381 /** |
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382 * Returns <tt>true</tt> if this map contains no key-value mappings. |
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383 * |
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384 * @return <tt>true</tt> if this map contains no key-value mappings. |
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385 */ |
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386 |
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387 public synchronized boolean isEmpty() { |
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388 return count == 0; |
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389 } |
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390 |
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391 |
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392 |
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393 /** |
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394 * Returns the value to which the specified key is mapped in this table. |
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395 * |
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396 * @param key a key in the table. |
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397 * @return the value to which the key is mapped in this table; |
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398 * <code>null</code> if the key is not mapped to any value in |
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399 * this table. |
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400 * @exception NullPointerException if the key is |
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401 * <code>null</code>. |
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402 * @see #put(Object, Object) |
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403 */ |
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404 |
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405 |
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406 public Object get(Object key) { |
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407 |
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408 // throw null pointer exception if key null |
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409 int hash = hash(key); |
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410 |
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411 /* |
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412 Start off at the apparently correct bin. If entry is found, we |
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413 need to check after a barrier anyway. If not found, we need a |
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414 barrier to check if we are actually in right bin. So either |
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415 way, we encounter only one barrier unless we need to retry. |
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416 And we only need to fully synchronize if there have been |
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417 concurrent modifications. |
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418 */ |
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419 |
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420 Entry[] tab = table; |
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421 int index = hash & (tab.length - 1); |
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422 Entry first = tab[index]; |
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423 Entry e = first; |
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424 |
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425 for (;;) { |
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426 if (e == null) { |
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427 |
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428 // If key apparently not there, check to |
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429 // make sure this was a valid read |
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430 |
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431 Entry[] reread = getTableForReading(); |
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432 if (tab == reread && first == tab[index]) |
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433 return null; |
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434 else { |
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435 // Wrong list -- must restart traversal at new first |
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436 tab = reread; |
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437 e = first = tab[index = hash & (tab.length-1)]; |
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438 } |
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439 |
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440 } |
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441 |
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442 else if (e.hash == hash && eq(key, e.key)) { |
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443 Object value = e.value; |
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444 if (value != null) |
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445 return value; |
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446 |
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447 // Entry was invalidated during deletion. But it could |
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448 // have been re-inserted, so we must retraverse. |
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449 // To avoid useless contention, get lock to wait out modifications |
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450 // before retraversing. |
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451 |
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452 synchronized(this) { |
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453 tab = table; |
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454 } |
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455 e = first = tab[index = hash & (tab.length-1)]; |
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456 |
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457 } |
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458 else |
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459 e = e.next; |
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460 } |
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461 } |
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462 |
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463 |
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464 /** |
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465 * Tests if the specified object is a key in this table. |
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466 * |
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467 * @param key possible key. |
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468 * @return <code>true</code> if and only if the specified object |
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469 * is a key in this table, as determined by the |
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470 * <tt>equals</tt> method; <code>false</code> otherwise. |
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471 * @exception NullPointerException if the key is |
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472 * <code>null</code>. |
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473 * @see #contains(Object) |
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474 */ |
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475 |
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476 |
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477 public boolean containsKey(Object key) { |
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478 return get(key) != null; |
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479 } |
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480 |
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481 /** |
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482 * Maps the specified <code>key</code> to the specified |
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483 * <code>value</code> in this table. Neither the key nor the |
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484 * value can be <code>null</code>. <p> |
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485 * |
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486 * The value can be retrieved by calling the <code>get</code> method |
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487 * with a key that is equal to the original key. |
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488 * |
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489 * @param key the table key. |
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490 * @param value the value. |
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parents:
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491 * @return the previous value of the specified key in this table, |
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492 * or <code>null</code> if it did not have one. |
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493 * @exception NullPointerException if the key or value is |
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494 * <code>null</code>. |
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495 * @see Object#equals(Object) |
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496 * @see #get(Object) |
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497 */ |
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498 |
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499 public Object put(Object key, Object value) { |
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500 if (value == null) |
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501 throw new NullPointerException(); |
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502 |
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503 int hash = hash(key); |
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504 Entry[] tab = table; |
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505 int index = hash & (tab.length-1); |
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506 Entry first = tab[index]; |
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507 Entry e; |
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508 |
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509 for (e = first; e != null; e = e.next) |
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parents:
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510 if (e.hash == hash && eq(key, e.key)) |
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511 break; |
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512 |
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513 synchronized(this) { |
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514 if (tab == table) { |
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parents:
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|
515 if (e == null) { |
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516 // make sure we are adding to correct list |
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parents:
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|
517 if (first == tab[index]) { |
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518 // Add to front of list |
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Dan Creswell <dan.creswell@gmail.com>
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519 Entry newEntry = new Entry(hash, key, value, first); |
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520 tab[index] = newEntry; |
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521 if (++count >= threshold) rehash(); |
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522 else recordModification(newEntry); |
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523 return null; |
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parents:
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524 } |
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parents:
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525 } |
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526 else { |
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527 Object oldValue = e.value; |
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528 if (first == tab[index] && oldValue != null) { |
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parents:
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529 e.value = value; |
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530 return oldValue; |
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|
531 } |
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parents:
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532 } |
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parents:
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|
533 } |
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|
534 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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535 // retry if wrong list or lost race against concurrent remove |
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536 return sput(key, value, hash); |
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Dan Creswell <dan.creswell@gmail.com>
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537 } |
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|
538 } |
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|
539 |
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540 |
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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
|
541 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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542 * Continuation of put(), called only when synch lock is |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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543 * held and interference has been detected. |
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544 **/ |
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parents:
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545 protected Object sput(Object key, Object value, int hash) { |
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Dan Creswell <dan.creswell@gmail.com>
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|
546 |
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547 Entry[] tab = table; |
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548 int index = hash & (tab.length-1); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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549 Entry first = tab[index]; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
550 Entry e = first; |
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parents:
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|
551 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
552 for (;;) { |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
553 if (e == null) { |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
554 Entry newEntry = new Entry(hash, key, value, first); |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
555 tab[index] = newEntry; |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
556 if (++count >= threshold) rehash(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
557 else recordModification(newEntry); |
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parents:
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|
558 return null; |
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parents:
diff
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|
559 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
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|
560 else if (e.hash == hash && eq(key, e.key)) { |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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561 Object oldValue = e.value; |
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Dan Creswell <dan.creswell@gmail.com>
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562 e.value = value; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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|
563 return oldValue; |
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parents:
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|
564 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
565 else |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
566 e = e.next; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
567 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
568 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
569 |
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parents:
diff
changeset
|
570 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
571 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
572 * Rehashes the contents of this map into a new table |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
573 * with a larger capacity. This method is called automatically when the |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
574 * number of keys in this map exceeds its capacity and load factor. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
575 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
576 protected void rehash() { |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
577 Entry[] oldTable = table; |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
578 int oldCapacity = oldTable.length; |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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579 if (oldCapacity >= MAXIMUM_CAPACITY) { |
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|
580 threshold = Integer.MAX_VALUE; // avoid retriggering |
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parents:
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|
581 return; |
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
582 } |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
583 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
584 int newCapacity = oldCapacity << 1; |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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585 int mask = newCapacity - 1; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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|
586 threshold = (int)(newCapacity * loadFactor); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
587 |
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parents:
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changeset
|
588 Entry[] newTable = new Entry[newCapacity]; |
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parents:
diff
changeset
|
589 /* |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
590 * 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
|
591 * using power-of-two expansion, the elements from each bin |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
592 * must either stay at same index, or move to |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
593 * oldCapacity+index. We also eliminate unnecessary node |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
594 * creation by catching cases where old nodes can be reused |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
595 * because their next fields won't change. Statistically, at |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
596 * the default threshhold, only about one-sixth of them need |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
597 * cloning. (The nodes they replace will be garbage |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
598 * collectable as soon as they are no longer referenced by any |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
599 * reader thread that may be in the midst of traversing table |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
600 * right now.) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
601 */ |
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parents:
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|
602 |
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parents:
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|
603 for (int i = 0; i < oldCapacity ; i++) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
604 // We need to guarantee that any existing reads of old Map can |
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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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|
605 // proceed. So we cannot yet null out each bin. |
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parents:
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|
606 Entry e = oldTable[i]; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
607 |
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parents:
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|
608 if (e != null) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
609 int idx = e.hash & mask; |
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parents:
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|
610 Entry next = e.next; |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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|
611 |
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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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|
612 // Single node on list |
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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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|
613 if (next == null) |
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parents:
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|
614 newTable[idx] = e; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
615 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
616 else { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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|
617 // Reuse trailing consecutive sequence of all same bit |
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parents:
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|
618 Entry lastRun = e; |
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parents:
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|
619 int lastIdx = idx; |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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620 for (Entry last = next; last != null; last = last.next) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
621 int k = last.hash & mask; |
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parents:
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|
622 if (k != lastIdx) { |
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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
|
623 lastIdx = k; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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624 lastRun = last; |
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parents:
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|
625 } |
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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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|
626 } |
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parents:
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|
627 newTable[lastIdx] = lastRun; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
628 |
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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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|
629 // Clone all remaining nodes |
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parents:
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630 for (Entry p = e; p != lastRun; p = p.next) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
631 int k = p.hash & mask; |
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parents:
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|
632 newTable[k] = new Entry(p.hash, p.key, |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
633 p.value, newTable[k]); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
634 } |
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parents:
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|
635 } |
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parents:
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changeset
|
636 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
637 } |
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parents:
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|
638 |
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parents:
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639 table = newTable; |
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parents:
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changeset
|
640 recordModification(newTable); |
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parents:
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|
641 } |
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parents:
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|
642 |
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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
|
643 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
644 * Removes the key (and its corresponding value) from this |
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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
|
645 * table. This method does nothing if the key is not in the table. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
646 * |
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parents:
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|
647 * @param key the key that needs to be removed. |
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parents:
diff
changeset
|
648 * @return the value to which the key had been mapped in this table, |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
649 * or <code>null</code> if the key did not have a mapping. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
650 * @exception NullPointerException if the key is |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
651 * <code>null</code>. |
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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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|
652 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
653 |
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parents:
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|
654 public Object remove(Object key) { |
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parents:
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|
655 /* |
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parents:
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|
656 Find the entry, then |
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Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
657 1. Set value field to null, to force get() to retry |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
658 2. Rebuild the list without this entry. |
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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
|
659 All entries following removed node can stay in list, but |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
660 all preceeding ones need to be cloned. Traversals rely |
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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
|
661 on this strategy to ensure that elements will not be |
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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
|
662 repeated during iteration. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
663 */ |
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parents:
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changeset
|
664 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
665 |
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parents:
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changeset
|
666 int hash = hash(key); |
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parents:
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changeset
|
667 Entry[] tab = table; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
668 int index = hash & (tab.length-1); |
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parents:
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changeset
|
669 Entry first = tab[index]; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
670 Entry e = first; |
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parents:
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changeset
|
671 |
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parents:
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changeset
|
672 for (e = first; e != null; e = e.next) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
673 if (e.hash == hash && eq(key, e.key)) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
674 break; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
675 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
676 |
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parents:
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changeset
|
677 synchronized(this) { |
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parents:
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changeset
|
678 if (tab == table) { |
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parents:
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changeset
|
679 if (e == null) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
680 if (first == tab[index]) |
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parents:
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changeset
|
681 return null; |
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parents:
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changeset
|
682 } |
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parents:
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changeset
|
683 else { |
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parents:
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changeset
|
684 Object oldValue = e.value; |
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parents:
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changeset
|
685 if (first == tab[index] && oldValue != null) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
686 e.value = null; |
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parents:
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|
687 count--; |
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parents:
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changeset
|
688 |
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parents:
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changeset
|
689 Entry head = e.next; |
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parents:
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changeset
|
690 for (Entry p = first; p != e; p = p.next) |
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parents:
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691 head = new Entry(p.hash, p.key, p.value, head); |
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parents:
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changeset
|
692 |
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parents:
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changeset
|
693 tab[index] = head; |
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parents:
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|
694 recordModification(head); |
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parents:
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changeset
|
695 return oldValue; |
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parents:
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changeset
|
696 } |
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parents:
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changeset
|
697 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
698 } |
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parents:
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changeset
|
699 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
700 // Wrong list or interference |
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parents:
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changeset
|
701 return sremove(key, hash); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
702 } |
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parents:
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changeset
|
703 } |
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parents:
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changeset
|
704 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
705 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
706 * Continuation of remove(), called only when synch lock is |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
707 * held and interference has been detected. |
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parents:
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changeset
|
708 **/ |
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parents:
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changeset
|
709 |
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parents:
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changeset
|
710 protected Object sremove(Object key, int hash) { |
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parents:
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changeset
|
711 Entry[] tab = table; |
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parents:
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changeset
|
712 int index = hash & (tab.length-1); |
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parents:
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changeset
|
713 Entry first = tab[index]; |
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parents:
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changeset
|
714 |
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parents:
diff
changeset
|
715 for (Entry e = first; e != null; e = e.next) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
716 if (e.hash == hash && eq(key, e.key)) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
717 Object oldValue = e.value; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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changeset
|
718 e.value = null; |
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parents:
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changeset
|
719 count--; |
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parents:
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changeset
|
720 Entry head = e.next; |
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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
|
721 for (Entry p = first; p != e; p = p.next) |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
722 head = new Entry(p.hash, p.key, p.value, head); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
723 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
724 tab[index] = head; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
725 recordModification(head); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
726 return oldValue; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
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|
727 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
728 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
729 return null; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
730 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
731 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
732 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
733 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
734 * Returns <tt>true</tt> if this map maps one or more keys to the |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
735 * specified value. Note: This method requires a full internal |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
736 * traversal of the hash table, and so is much slower than |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
737 * method <tt>containsKey</tt>. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
738 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
739 * @param value value whose presence in this map is to be tested. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
740 * @return <tt>true</tt> if this map maps one or more keys to the |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
741 * specified value. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
742 * @exception NullPointerException if the value is <code>null</code>. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
743 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
744 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
745 public boolean containsValue(Object value) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
746 if (value == null) throw new NullPointerException(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
747 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
748 Entry tab[] = getTableForReading(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
749 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
750 for (int i = 0 ; i < tab.length; ++i) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
751 for (Entry e = tab[i] ; e != null ; e = e.next) |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
752 if (value.equals(e.value)) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
753 return true; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
754 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
755 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
756 return false; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
757 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
758 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
759 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
760 * Tests if some key maps into the specified value in this table. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
761 * This operation is more expensive than the <code>containsKey</code> |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
762 * method.<p> |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
763 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
764 * Note that this method is identical in functionality to containsValue, |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
765 * (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.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
766 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
767 * @param value a value to search for. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
768 * @return <code>true</code> if and only if some key maps to the |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
769 * <code>value</code> argument in this table as |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
770 * determined by the <tt>equals</tt> method; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
771 * <code>false</code> otherwise. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
772 * @exception NullPointerException if the value is <code>null</code>. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
773 * @see #containsKey(Object) |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
774 * @see #containsValue(Object) |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
775 * @see Map |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
776 */ |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
777 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
778 public boolean contains(Object value) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
779 return containsValue(value); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
780 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
781 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
782 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
783 /** |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
784 * Copies all of the mappings from the specified map to this one. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
785 * |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
786 * These mappings replace any mappings that this map had for any of the |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
787 * keys currently in the specified Map. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
788 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
789 * @param t Mappings to be stored in this map. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
790 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
791 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
792 public synchronized void putAll(Map t) { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
793 int n = t.size(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
794 if (n == 0) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
795 return; |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
796 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
797 // Expand enough to hold at least n elements without resizing. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
798 // We can only resize table by factor of two at a time. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
799 // It is faster to rehash with fewer elements, so do it now. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
800 while (n >= threshold) |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
801 rehash(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
802 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
803 for (Iterator it = t.entrySet().iterator(); it.hasNext();) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
804 Map.Entry entry = (Map.Entry) it.next(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
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parents:
diff
changeset
|
805 Object key = entry.getKey(); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
806 Object value = entry.getValue(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
807 put(key, value); |
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
808 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
809 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
810 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
811 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
812 /** |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
813 * Removes all mappings from this map. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
814 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
815 public synchronized void clear() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
816 Entry tab[] = table; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
817 for (int i = 0; i < tab.length ; ++i) { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
818 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
819 // must invalidate all to force concurrent get's to wait and then retry |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
820 for (Entry e = tab[i]; e != null; e = e.next) |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
821 e.value = null; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
822 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
823 tab[i] = null; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
824 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
825 count = 0; |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
826 recordModification(tab); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
827 } |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
828 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
829 /** |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
830 * Returns a shallow copy of this |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
831 * <tt>ConcurrentReaderHashMap</tt> instance: the keys and |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
832 * values themselves are not cloned. |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
833 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
834 * @return a shallow copy of this map. |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
835 */ |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
836 |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
837 public synchronized Object clone() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
838 try { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
839 ConcurrentReaderHashMap t = (ConcurrentReaderHashMap)super.clone(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
840 |
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841 t.keySet = null; |
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842 t.entrySet = null; |
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843 t.values = null; |
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844 |
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845 Entry[] tab = table; |
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846 t.table = new Entry[tab.length]; |
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847 Entry[] ttab = t.table; |
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848 |
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849 for (int i = 0; i < tab.length; ++i) { |
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850 Entry first = null; |
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851 for (Entry e = tab[i]; e != null; e = e.next) |
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852 first = new Entry(e.hash, e.key, e.value, first); |
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853 ttab[i] = first; |
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854 } |
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855 |
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856 return t; |
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857 } |
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858 catch (CloneNotSupportedException e) { |
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859 // this shouldn't happen, since we are Cloneable |
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860 throw new InternalError(); |
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861 } |
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862 } |
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863 |
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864 // Views |
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865 |
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866 protected transient Set keySet = null; |
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867 protected transient Set entrySet = null; |
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868 protected transient Collection values = null; |
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869 |
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870 /** |
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871 * Returns a set view of the keys contained in this map. The set is |
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872 * backed by the map, so changes to the map are reflected in the set, and |
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873 * vice-versa. The set supports element removal, which removes the |
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874 * corresponding mapping from this map, via the <tt>Iterator.remove</tt>, |
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875 * <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt>, and |
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876 * <tt>clear</tt> operations. It does not support the <tt>add</tt> or |
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877 * <tt>addAll</tt> operations. |
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878 * |
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879 * @return a set view of the keys contained in this map. |
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880 */ |
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881 |
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882 public Set keySet() { |
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883 Set ks = keySet; |
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884 return (ks != null)? ks : (keySet = new KeySet()); |
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885 } |
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886 |
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887 private class KeySet extends AbstractSet { |
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888 public Iterator iterator() { |
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|
889 return new KeyIterator(); |
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890 } |
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891 public int size() { |
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892 return ConcurrentReaderHashMap.this.size(); |
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893 } |
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894 public boolean contains(Object o) { |
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895 return ConcurrentReaderHashMap.this.containsKey(o); |
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896 } |
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897 public boolean remove(Object o) { |
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898 return ConcurrentReaderHashMap.this.remove(o) != null; |
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|
899 } |
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900 public void clear() { |
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901 ConcurrentReaderHashMap.this.clear(); |
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902 } |
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|
903 } |
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|
904 |
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|
905 /** |
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|
906 * Returns a collection view of the values contained in this map. The |
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907 * collection is backed by the map, so changes to the map are reflected in |
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|
908 * the collection, and vice-versa. The collection supports element |
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|
909 * removal, which removes the corresponding mapping from this map, via the |
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|
910 * <tt>Iterator.remove</tt>, <tt>Collection.remove</tt>, |
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|
911 * <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> operations. |
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|
912 * It does not support the <tt>add</tt> or <tt>addAll</tt> operations. |
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|
913 * |
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|
914 * @return a collection view of the values contained in this map. |
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parents:
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|
915 */ |
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|
916 |
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|
917 public Collection values() { |
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|
918 Collection vs = values; |
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|
919 return (vs != null)? vs : (values = new Values()); |
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|
920 } |
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|
921 |
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922 private class Values extends AbstractCollection { |
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923 public Iterator iterator() { |
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|
924 return new ValueIterator(); |
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|
925 } |
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|
926 public int size() { |
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|
927 return ConcurrentReaderHashMap.this.size(); |
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|
928 } |
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parents:
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|
929 public boolean contains(Object o) { |
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|
930 return ConcurrentReaderHashMap.this.containsValue(o); |
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|
931 } |
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|
932 public void clear() { |
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|
933 ConcurrentReaderHashMap.this.clear(); |
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|
934 } |
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|
935 } |
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|
936 |
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|
937 /** |
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|
938 * Returns a collection view of the mappings contained in this map. Each |
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939 * element in the returned collection is a <tt>Map.Entry</tt>. The |
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|
940 * collection is backed by the map, so changes to the map are reflected in |
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|
941 * the collection, and vice-versa. The collection supports element |
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|
942 * removal, which removes the corresponding mapping from the map, via the |
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|
943 * <tt>Iterator.remove</tt>, <tt>Collection.remove</tt>, |
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|
944 * <tt>removeAll</tt>, <tt>retainAll</tt>, and <tt>clear</tt> operations. |
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|
945 * It does not support the <tt>add</tt> or <tt>addAll</tt> operations. |
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|
946 * |
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|
947 * @return a collection view of the mappings contained in this map. |
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|
948 */ |
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|
949 |
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|
950 public Set entrySet() { |
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|
951 Set es = entrySet; |
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|
952 return (es != null) ? es : (entrySet = new EntrySet()); |
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|
953 } |
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|
954 |
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changeset
|
955 private class EntrySet extends AbstractSet { |
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|
956 public Iterator iterator() { |
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|
957 return new HashIterator(); |
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parents:
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|
958 } |
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959 public boolean contains(Object o) { |
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960 if (!(o instanceof Map.Entry)) |
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961 return false; |
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962 Map.Entry entry = (Map.Entry)o; |
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963 Object v = ConcurrentReaderHashMap.this.get(entry.getKey()); |
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964 return v != null && v.equals(entry.getValue()); |
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965 } |
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966 public boolean remove(Object o) { |
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967 if (!(o instanceof Map.Entry)) |
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968 return false; |
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969 return ConcurrentReaderHashMap.this.findAndRemoveEntry((Map.Entry)o); |
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970 } |
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971 public int size() { |
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972 return ConcurrentReaderHashMap.this.size(); |
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973 } |
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974 public void clear() { |
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975 ConcurrentReaderHashMap.this.clear(); |
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976 } |
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977 } |
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978 |
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979 /** |
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980 * Helper method for entrySet.remove |
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981 **/ |
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982 protected synchronized boolean findAndRemoveEntry(Map.Entry entry) { |
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983 Object key = entry.getKey(); |
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984 Object v = get(key); |
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985 if (v != null && v.equals(entry.getValue())) { |
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986 remove(key); |
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987 return true; |
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988 } |
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989 else |
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990 return false; |
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991 } |
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992 |
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993 /** |
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994 * Returns an enumeration of the keys in this table. |
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995 * |
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996 * @return an enumeration of the keys in this table. |
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997 * @see Enumeration |
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998 * @see #elements() |
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999 * @see #keySet() |
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1000 * @see Map |
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1001 */ |
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1002 public Enumeration keys() { |
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1003 return new KeyIterator(); |
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1004 } |
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1005 |
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1006 /** |
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1007 * Returns an enumeration of the values in this table. |
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1008 * Use the Enumeration methods on the returned object to fetch the elements |
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1009 * sequentially. |
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1010 * |
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1011 * @return an enumeration of the values in this table. |
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1012 * @see java.util.Enumeration |
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1013 * @see #keys() |
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1014 * @see #values() |
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1015 * @see Map |
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1016 */ |
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1017 |
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1018 public Enumeration elements() { |
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1019 return new ValueIterator(); |
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1020 } |
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1021 |
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1022 |
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1023 /** |
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1024 * ConcurrentReaderHashMap collision list entry. |
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1025 */ |
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1026 |
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1027 protected static class Entry implements Map.Entry { |
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1028 |
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|
1029 /* |
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1030 The use of volatile for value field ensures that |
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1031 we can detect status changes without synchronization. |
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1032 The other fields are never changed, and are |
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1033 marked as final. |
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1034 */ |
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|
1035 |
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1036 protected final int hash; |
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|
1037 protected final Object key; |
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1038 protected final Entry next; |
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|
1039 protected volatile Object value; |
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|
1040 |
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|
1041 Entry(int hash, Object key, Object value, Entry next) { |
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1042 this.hash = hash; |
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|
1043 this.key = key; |
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1044 this.next = next; |
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1045 this.value = value; |
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1046 } |
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|
1047 |
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|
1048 // Map.Entry Ops |
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|
1049 |
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|
1050 public Object getKey() { |
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1051 return key; |
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|
1052 } |
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|
1053 |
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|
1054 /** |
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|
1055 * Get the value. Note: In an entrySet or entrySet.iterator, |
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1056 * unless the set or iterator is used under synchronization of the |
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1057 * table as a whole (or you can otherwise guarantee lack of |
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1058 * concurrent modification), <tt>getValue</tt> <em>might</em> |
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1059 * return null, reflecting the fact that the entry has been |
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1060 * concurrently removed. However, there are no assurances that |
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1061 * concurrent removals will be reflected using this method. |
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|
1062 * |
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parents:
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|
1063 * @return the current value, or null if the entry has been |
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parents:
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|
1064 * detectably removed. |
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|
1065 **/ |
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|
1066 public Object getValue() { |
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|
1067 return value; |
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|
1068 } |
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|
1069 |
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|
1070 /** |
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|
1071 * Set the value of this entry. Note: In an entrySet or |
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|
1072 * entrySet.iterator), unless the set or iterator is used under |
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|
1073 * synchronization of the table as a whole (or you can otherwise |
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1074 * guarantee lack of concurrent modification), <tt>setValue</tt> |
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1075 * is not strictly guaranteed to actually replace the value field |
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1076 * obtained via the <tt>get</tt> operation of the underlying hash |
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|
1077 * table in multithreaded applications. If iterator-wide |
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|
1078 * synchronization is not used, and any other concurrent |
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|
1079 * <tt>put</tt> or <tt>remove</tt> operations occur, sometimes |
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1080 * even to <em>other</em> entries, then this change is not |
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1081 * guaranteed to be reflected in the hash table. (It might, or it |
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1082 * might not. There are no assurances either way.) |
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1083 * |
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1084 * @param value the new value. |
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1085 * @return the previous value, or null if entry has been detectably |
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1086 * removed. |
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1087 * @exception NullPointerException if the value is <code>null</code>. |
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1088 * |
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|
1089 **/ |
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1090 |
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1091 public Object setValue(Object value) { |
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1092 if (value == null) |
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1093 throw new NullPointerException(); |
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1094 Object oldValue = this.value; |
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1095 this.value = value; |
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1096 return oldValue; |
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1097 } |
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1098 |
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1099 public boolean equals(Object o) { |
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1100 if (!(o instanceof Map.Entry)) |
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1101 return false; |
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1102 Map.Entry e = (Map.Entry)o; |
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1103 return (key.equals(e.getKey()) && value.equals(e.getValue())); |
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1104 } |
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1105 |
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1106 public int hashCode() { |
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1107 return key.hashCode() ^ value.hashCode(); |
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1108 } |
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|
1109 |
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1110 public String toString() { |
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1111 return key + "=" + value; |
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1112 } |
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1113 |
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1114 } |
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1115 |
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1116 protected class HashIterator implements Iterator, Enumeration { |
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1117 protected final Entry[] tab; // snapshot of table |
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1118 protected int index; // current slot |
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1119 protected Entry entry = null; // current node of slot |
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1120 protected Object currentKey; // key for current node |
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1121 protected Object currentValue; // value for current node |
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1122 protected Entry lastReturned = null; // last node returned by next |
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|
1123 |
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1124 protected HashIterator() { |
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1125 tab = ConcurrentReaderHashMap.this.getTableForReading(); |
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1126 index = tab.length - 1; |
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1127 } |
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|
1128 |
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1129 public boolean hasMoreElements() { return hasNext(); } |
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1130 public Object nextElement() { return next(); } |
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1131 |
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|
1132 |
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1133 public boolean hasNext() { |
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1134 |
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1135 /* |
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1136 currentkey and currentValue are set here to ensure that next() |
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1137 returns normally if hasNext() returns true. This avoids |
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1138 surprises especially when final element is removed during |
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parents:
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1139 traversal -- instead, we just ignore the removal during |
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1140 current traversal. |
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1141 */ |
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|
1142 |
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1143 for (;;) { |
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1144 if (entry != null) { |
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1145 Object v = entry.value; |
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1146 if (v != null) { |
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|
1147 currentKey = entry.key; |
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1148 currentValue = v; |
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|
1149 return true; |
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|
1150 } |
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|
1151 else |
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|
1152 entry = entry.next; |
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parents:
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|
1153 } |
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|
1154 |
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parents:
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1155 while (entry == null && index >= 0) |
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1156 entry = tab[index--]; |
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1157 |
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1158 if (entry == null) { |
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|
1159 currentKey = currentValue = null; |
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|
1160 return false; |
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|
1161 } |
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|
1162 } |
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|
1163 } |
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|
1164 |
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1165 protected Object returnValueOfNext() { return entry; } |
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|
1166 |
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|
1167 public Object next() { |
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|
1168 if (currentKey == null && !hasNext()) |
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|
1169 throw new NoSuchElementException(); |
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1170 |
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1171 Object result = returnValueOfNext(); |
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1172 lastReturned = entry; |
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1173 currentKey = currentValue = null; |
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1174 entry = entry.next; |
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|
1175 return result; |
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|
1176 } |
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|
1177 |
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|
1178 public void remove() { |
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|
1179 if (lastReturned == null) |
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1180 throw new IllegalStateException(); |
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1181 ConcurrentReaderHashMap.this.remove(lastReturned.key); |
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|
1182 lastReturned = null; |
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|
1183 } |
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|
1184 |
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|
1185 } |
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|
1186 |
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|
1187 |
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|
1188 protected class KeyIterator extends HashIterator { |
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|
1189 protected Object returnValueOfNext() { return currentKey; } |
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1190 } |
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|
1191 |
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|
1192 protected class ValueIterator extends HashIterator { |
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|
1193 protected Object returnValueOfNext() { return currentValue; } |
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|
1194 } |
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|
1195 |
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|
1196 |
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|
1197 |
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|
1198 /** |
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|
1199 * Save the state of the <tt>ConcurrentReaderHashMap</tt> |
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1200 * instance to a stream (i.e., |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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|
1201 * serialize it). |
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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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1202 * |
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Initial checkin of blitz 2.0 fcs - no installer yet.
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|
1203 * @serialData The <i>capacity</i> 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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1204 * ConcurrentReaderHashMap (the length 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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1205 * bucket array) is emitted (int), followed by the |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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1206 * <i>size</i> of the ConcurrentReaderHashMap (the number of key-value |
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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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1207 * mappings), followed by the key (Object) and value (Object) |
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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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1208 * for each key-value mapping represented by the ConcurrentReaderHashMap |
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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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|
1209 * The key-value mappings are emitted in no particular order. |
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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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1210 */ |
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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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1211 |
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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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1212 private synchronized void writeObject(java.io.ObjectOutputStream s) |
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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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1213 throws IOException { |
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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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|
1214 // Write out the threshold, loadfactor, and any hidden stuff |
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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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|
1215 s.defaultWriteObject(); |
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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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1216 |
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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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|
1217 // Write out number of buckets |
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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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1218 s.writeInt(table.length); |
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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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1219 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
1220 // Write out size (number of Mappings) |
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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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|
1221 s.writeInt(count); |
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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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1222 |
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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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1223 // Write out keys and values (alternating) |
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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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|
1224 for (int index = table.length-1; index >= 0; index--) { |
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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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|
1225 Entry entry = table[index]; |
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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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1226 |
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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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1227 while (entry != null) { |
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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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|
1228 s.writeObject(entry.key); |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
1229 s.writeObject(entry.value); |
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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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|
1230 entry = entry.next; |
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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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|
1231 } |
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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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|
1232 } |
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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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|
1233 } |
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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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|
1234 |
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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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|
1235 /** |
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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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|
1236 * Reconstitute the <tt>ConcurrentReaderHashMap</tt> |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
1237 * instance from a stream (i.e., |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
1238 * deserialize it). |
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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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|
1239 */ |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
1240 private synchronized void readObject(java.io.ObjectInputStream s) |
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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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|
1241 throws IOException, ClassNotFoundException { |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
1242 // Read in the threshold, loadfactor, and any hidden stuff |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
1243 s.defaultReadObject(); |
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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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|
1244 |
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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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|
1245 // Read in number of buckets and allocate the bucket array; |
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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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|
1246 int numBuckets = s.readInt(); |
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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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|
1247 table = new Entry[numBuckets]; |
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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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1248 |
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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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|
1249 // Read in size (number of Mappings) |
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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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|
1250 int size = s.readInt(); |
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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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|
1251 |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
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|
1252 // Read the keys and values, and put the mappings in the 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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|
1253 for (int i=0; i<size; i++) { |
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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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1254 Object key = s.readObject(); |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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1255 Object value = s.readObject(); |
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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
|
1256 put(key, value); |
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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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|
1257 } |
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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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|
1258 } |
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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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|
1259 |
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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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|
1260 /** |
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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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|
1261 * Return the number of slots 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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1262 **/ |
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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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|
1263 |
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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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|
1264 public synchronized int capacity() { |
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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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1265 return table.length; |
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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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|
1266 } |
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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
|
1267 |
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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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|
1268 /** |
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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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|
1269 * Return the load factor |
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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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|
1270 **/ |
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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
|
1271 public float loadFactor() { |
3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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changeset
|
1272 return loadFactor; |
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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
|
1273 } |
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Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff
changeset
|
1274 } |