Mercurial > hg > blitz_stable

annotate src/org/dancres/struct/BitIndex.java @ 27:511648fa4d64 Version 2.1

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Version to 2.1
author Dan Creswell <dan.creswell@gmail.com>
date Mon, 04 Jan 2010 13:00:40 +0000
parents 3dc0c5604566
children
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0
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1 package org.dancres.struct;
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2
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3 import java.util.ArrayList;
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4
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5 import java.util.LinkedList;
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6
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7 import java.util.Random;
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8
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9 import java.util.HashMap;
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10
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11 /**
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12 <p>An MT-safe BitIndex. Because BitIndex's can never change size and all
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13 updates are lock protected, there is no need to clone an index via copy
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14 unless one requires a stable copy. i.e. If one can tolerate an out-of-date
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15 access that may render misses, the cost of a copy can be avoided. Iteration
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16 incurs locking therefore but only to access a snapshot of data bits.</p>
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17
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18 <p>Be sure to run this with plenty of memory to avoid GC skewing timings
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19 during tests.</p>
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20 */
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21 public class BitIndex {
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22 private Object[] theLocks;
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23 private long[] theIndex;
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24 private int theSize;
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25
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26 private Object theTotalLock = new Object();
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27 private int theTotalSet;
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28
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29 public BitIndex(int aSize) {
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30 theSize = aSize;
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31
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32 int mySize = aSize / 64;
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33
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34 if ((aSize % 64) != 0)
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35 ++mySize;
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36
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37 theIndex = new long[mySize];
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38 theLocks = new Object[mySize];
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39 for (int i = 0; i < theLocks.length; i++) {
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40 theLocks[i] = new Object();
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41 }
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42 }
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43
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44 public int getSize() {
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45 return theSize;
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46 }
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47
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48 public void set(int aPos) {
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49 if (aPos >= theSize)
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50 throw new IllegalArgumentException("Position larger than size");
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51
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52 int myIndex = aPos / 64;
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53 int myOffset = aPos % 64;
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54 long myNewBit = 1L << myOffset;
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55
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56 synchronized(theLocks[myIndex]) {
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57 theIndex[myIndex] |= myNewBit;
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58 }
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59
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60 synchronized(theTotalLock) {
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61 ++theTotalSet;
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62 }
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63 }
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64
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65 public void clear(int aPos) {
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66 if (aPos >= theSize)
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67 throw new IllegalArgumentException("Position larger than size");
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68
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69 int myIndex = aPos / 64;
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70 int myOffset = aPos % 64;
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71 long myNewBit = 1L << myOffset;
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72 myNewBit ^= 0xffffffffffffffffL;
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73
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74 synchronized(theLocks[myIndex]) {
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75 theIndex[myIndex] &= myNewBit;
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76 }
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77
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78 synchronized(theTotalLock) {
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79 --theTotalSet;
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80 }
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81 }
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82
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83 public int count() {
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84 synchronized(theTotalLock) {
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85 return theTotalSet;
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86 }
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87 }
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88
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89 public BitVisitor getVisitor(boolean forZero) {
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90 return new BitVisitorImpl(theIndex, theLocks, forZero);
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91 }
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92
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93 public void iterate(BitListener aListener) {
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94 int myBase = 0;
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95
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96 for (int i = 0; i < theIndex.length; i++) {
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97 long myMask = 1L;
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98 long myLong;
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99
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100 synchronized(theLocks[i]) {
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101 myLong = theIndex[i];
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102 }
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103
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104 if (myLong != 0) {
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105 for (int j = 0; j < 64; j++) {
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106 if ((myLong & myMask) != 0)
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107 if (aListener.active(myBase + j))
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108 return;
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109
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110 myMask = myMask << 1;
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111 }
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112 }
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113
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114 myBase += 64;
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115 }
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116 }
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117
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118 public void iterateZero(BitListener aListener) {
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119 int myBase = 0;
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120
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121 for (int i = 0; i < theIndex.length; i++) {
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122 long myMask = 1L;
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123 long myLong;
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124
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125 synchronized(theLocks[i]) {
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126 myLong = theIndex[i];
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127 }
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128
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129 for (int j = 0; j < 64; j++) {
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130 if ((myLong & myMask) == 0)
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131 if (aListener.inactive(myBase + j))
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132 return;
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133
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134 myMask = myMask << 1;
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135 }
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136
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137 myBase += 64;
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138 }
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139 }
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140
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141 public BitIndex copy() {
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142 BitIndex myIndex = new BitIndex(theSize);
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143 System.arraycopy(theIndex, 0, myIndex.theIndex, 0, theIndex.length);
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144
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145 return myIndex;
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146 }
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147
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148 public long[] rawCopy() {
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149 long[] myRaw = new long[theIndex.length];
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150
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151 System.arraycopy(theIndex, 0, myRaw, 0, theIndex.length);
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152
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153 return myRaw;
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154 }
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155
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156 public static void main(String args[]) {
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157 BitIndex myIndex = new BitIndex(512);
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158
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159 myIndex.set(1);
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160
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161 System.out.println(Long.toBinaryString(myIndex.theIndex[0]));
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162
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163 myIndex.set(35);
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164
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165 System.out.println(Long.toBinaryString(myIndex.theIndex[0]));
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166
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167 myIndex.set(67);
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168
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169 System.out.println(Long.toBinaryString(myIndex.theIndex[1]));
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170
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171 myIndex.clear(35);
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172
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173 System.out.println(Long.toBinaryString(myIndex.theIndex[0]));
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174
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175 myIndex.set(35);
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176
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177 myIndex.iterate(new TestListener());
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178
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179 myIndex.set(63);
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180
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181 System.out.println(Long.toBinaryString(myIndex.theIndex[0]));
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182
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183 BitVisitor myVisitor = myIndex.getVisitor(false);
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184
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185 int mySlot;
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186
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187 while ((mySlot = myVisitor.getNext()) != -1) {
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188 System.out.print("Bit set at: " + mySlot + " ");
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189 }
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190 System.out.println();
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191
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192 myVisitor = myIndex.getVisitor(true);
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193
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194 while ((mySlot = myVisitor.getNext()) != -1) {
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195 System.out.print("Bit clear at: " + mySlot + " ");
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196 }
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197 System.out.println();
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198
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199 /*
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diff changeset
200 Here we test out how fast we might be able to do add/remove's
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Dan Creswell <dan.creswell@gmail.com>
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201 from a cache indexer based on a HashMap which is
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
202 secondary indexed via a HashMap of hashcodes containing buckets
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Dan Creswell <dan.creswell@gmail.com>
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203 implemented as ArrayLists vs a combination of array,
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204 indexed by HashMap to get offsets and then secondary indexed via a
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diff changeset
205 HashMap of hashcodes containing BitMap indexes
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Dan Creswell <dan.creswell@gmail.com>
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206 */
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207 ArrayList myList = new ArrayList(512);
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208
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209 for (int i = 0; i < 512; i++) {
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210 myList.add(new Integer(i));
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Dan Creswell <dan.creswell@gmail.com>
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211 }
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212
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213 HashMap myMap = new HashMap();
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214
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215 for (int i = 0; i < 512; i++) {
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diff changeset
216 myIndex.set(i);
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diff changeset
217 myMap.put(new Integer(i), new Integer(i));
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diff changeset
218 }
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219
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diff changeset
220 Random myRandom = new Random();
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diff changeset
221
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
222 long myStart = System.currentTimeMillis();
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Dan Creswell <dan.creswell@gmail.com>
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223
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diff changeset
224 for (int i = 0; i < 100000; i++) {
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225 Integer myId = new Integer(myRandom.nextInt(512));
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226
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diff changeset
227 myMap.remove(myId);
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
228 myList.remove(myId);
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
229 myList.add(myId);
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
230 myMap.put(myId, myId);
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
231 }
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232
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diff changeset
233 long myEnd = System.currentTimeMillis();
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234
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diff changeset
235 System.out.println("100000 remove/adds on ArrayList: " +
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
236 (myEnd - myStart));
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diff changeset
237
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diff changeset
238 myIndex = new BitIndex(512);
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diff changeset
239
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diff changeset
240 myStart = System.currentTimeMillis();
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241
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242 for (int i = 0; i < 100000; i++) {
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diff changeset
243 int myId = myRandom.nextInt(512);
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244
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245 Integer myPos = (Integer) myMap.remove(new Integer(myId));
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diff changeset
246 myIndex.clear(myPos.intValue());
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247
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248 myMap.put(myPos, myPos);
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
249 myIndex.set(myPos.intValue());
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
250 }
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251
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252 myEnd = System.currentTimeMillis();
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253
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254 System.out.println("100000 remove/adds on Bitmap Indexed Map: " +
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255 (myEnd - myStart));
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256
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257
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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diff changeset
258 /*
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
259 Now we test how a search might behave - first case is based on
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
260 copying the entire contents of a secondary index containing
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
261 primary keys whilst the second case consists of BitMap indexes
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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diff changeset
262 which index into one array of primary keys. Thus in the second
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
263 case we must at least copy the bitmap index and probably ought to
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
264 copy the keys (note we could copy the keys in chunks same as we
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
265 lock and copy chunks of the secondary indexes in the first case).
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266
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
267 In fact we don't need to copy the base array in the BitIndex case
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diff changeset
268 as an approximation is acceptable. If the entry that would be a
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Dan Creswell <dan.creswell@gmail.com>
parents:
diff changeset
269 partial hit has been replaced, we'll filter it out later. However,
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Dan Creswell <dan.creswell@gmail.com>
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diff changeset
270 in high workload's this might give us a lot of pointless searches.
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parents:
diff changeset
271 */
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272 myStart = System.currentTimeMillis();
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273
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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274 for (int i = 0; i < 100000; i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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275 Object[] myArray = new Object[512];
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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276 myArray = myList.toArray(myArray);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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277 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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278
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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279 myEnd = System.currentTimeMillis();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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280
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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281 System.out.println("100000 copies of array: " + (myEnd - myStart));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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282
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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283 myStart = System.currentTimeMillis();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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284
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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285 for (int i = 0 ; i < 100000; i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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286 BitIndex myBits = myIndex.copy();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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287 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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288
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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289 myEnd = System.currentTimeMillis();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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290
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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291 System.out.println("100000 copies of bitset: " +
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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292 (myEnd - myStart));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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293
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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294 myStart = System.currentTimeMillis();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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295
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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296 for (int i = 0 ; i < 100000; i++) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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297 Object[] myArray = new Object[512];
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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298 myArray = myList.toArray(myArray);
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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299 myIndex.copy();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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300 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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301
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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302 myEnd = System.currentTimeMillis();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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303
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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304 System.out.println("100000 copies of array and bitset: " +
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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305 (myEnd - myStart));
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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306
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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307
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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308 myStart = System.currentTimeMillis();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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309
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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310 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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311
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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312 private static class TestListener implements BitListener {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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313 public boolean active(int aPos) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
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314 System.out.println("Slot: " + aPos + " is active");
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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315 return false;
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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316 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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317
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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318 public boolean inactive(int aPos) {
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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319 throw new org.dancres.util.NotImplementedException();
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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320 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
parents:
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321 }
3dc0c5604566 Initial checkin of blitz 2.0 fcs - no installer yet.
Dan Creswell <dan.creswell@gmail.com>
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322 }