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annotate src/org/tmatesoft/hg/util/SparseSet.java @ 277:74e7493a042a

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Favor delegation over generalization
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Mon, 29 Aug 2011 23:14:59 +0200
parents 3dd953c65619
children
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.util;
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18
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19 import java.util.Arrays;
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20
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21 import org.tmatesoft.hg.internal.Experimental;
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22
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23 /**
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24 * WORK IN PROGRESS, DO NOT USE
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25 * Memory-friendly alternative to HashMap-backed Pool. Set where object can be obtained (not only queried for presence)
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26 *
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27 * cpython repo, use of HashMap Pool results in ~6 Mb of Map.Entry and Map.Entry[],
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28 * while use of SparseSet result in 2 Mb.
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29 *
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30 * @author Artem Tikhomirov
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31 * @author TMate Software Ltd.
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32 */
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33 @Experimental(reason="Requires tuning to accomodate to collection size. Present state (6-6-6) is too much for a lot of uses")
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34 public class SparseSet<T> {
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35
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36 public static void main(String[] args) {
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37 SparseSet<String> ss = new SparseSet<String>();
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38 String one = Integer.toString(156), two = Integer.toString(1024), three = Integer.toString(1123123);
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39 ss.put(one);
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40 ss.put(two);
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41 ss.put(three);
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42 System.out.println(one == ss.get(one));
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43 System.out.println(two == ss.get(two));
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44 System.out.println(three == ss.get(three));
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45 System.out.println(null == ss.get("one"));
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46 System.out.println(one == ss.get(Integer.toString(156)));
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47 System.out.println(two == ss.get(Integer.toString(1024)));
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48 System.out.println(three == ss.get(Integer.toString(1123123)));
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49 ss.dump();
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50 }
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51
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52 @SuppressWarnings("unused")
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53 private static final int MASK_8BIT = 0xFF, MASK_7BIT = 0x7F, MASK_6BIT = 0x3F, MASK_5BIT = 0x1F, MASK_4BIT = 0x0F;
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54 private static final int I1_SHIFT = 15, I2_SHIFT = 6, I3_SHIFT = 0;
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55 // 6, 5, 5
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56 private static final int I1_MASK = MASK_7BIT, I2_MASK = MASK_4BIT, I3_MASK = MASK_4BIT;
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57
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58 private final int[] fixups = new int[] {0x1, 0x10, 0xA, 0xD, 0x1F }; // rehash attempts
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59 private final IndexBranch[] level2 = new IndexBranch[I1_MASK + 1];
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60 private int size = 0;
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61
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62
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63 //
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64 int directPut, neighborPut;
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65 int[] fixupPut1 = new int[fixups.length], fixupPut2 = new int[fixups.length];;
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66
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67 public void put(T o) {
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68 final int hash = hash(o);
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69 final int i1 = (hash >>> I1_SHIFT) & I1_MASK, i2 = (hash >>> I2_SHIFT) & I2_MASK, i3 = (hash >>> I3_SHIFT) & I3_MASK;
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70 LeafBranch l3 = leafBranchPut(i1, i2);
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71 int res;
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72 if ((res = l3.put(i3, o)) != 0) {
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73 size++;
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74 if (res == 1) {
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75 directPut++;
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76 } else if (res == 2) {
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77 neighborPut++;
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78 }
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79 return;
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80 }
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81 for (int i = 0; i < fixups.length; i++) {
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82 int fixup = fixups[i];
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83 l3 = leafBranchPut(i1 ^ fixup, i2);
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84 if (l3.putIfEmptyOrSame(i3, o)) {
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85 size++;
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86 fixupPut1[i]++;
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87 return;
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88 }
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89 l3 = leafBranchPut(i1, i2 ^ fixup);
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90 if (l3.putIfEmptyOrSame(i3, o)) {
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91 size++;
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92 fixupPut2[i]++;
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93 return;
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94 }
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95 }
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96 throw new IllegalStateException(String.valueOf(o));
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97 }
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98
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99 @SuppressWarnings("unchecked")
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100 public T get(T o) {
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101 final int hash = hash(o);
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102 final int i1 = (hash >>> I1_SHIFT) & I1_MASK, i2 = (hash >>> I2_SHIFT) & I2_MASK, i3 = (hash >>> I3_SHIFT) & I3_MASK;
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103 //
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104 LeafBranch l3 = leafBranchGet(i1, i2);
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105 if (l3 == null) {
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106 return null;
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107 }
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108 Object c;
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109 if ((c = l3.get(i3, o)) != null) {
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110 return c == l3 ? null : (T) c;
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111 }
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112 if ((c = l3.get(i3 ^ 0x1, o)) != null) {
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113 return c == l3 ? null : (T) c;
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114 }
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115 if ((c = l3.get(i3 ^ 0x2, o)) != null) {
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116 return c == l3 ? null : (T) c;
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117 }
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118 if ((c = l3.get(i3 ^ 0x3, o)) != null) {
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119 return c == l3 ? null : (T) c;
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120 }
260
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121 for (int fixup : fixups) {
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122 Object data = leafValueGet(i1 ^ fixup, i2, i3);
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123 if (data == null) {
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124 return null;
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125 }
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126 if (o.equals(data)) {
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127 return (T)data;
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128 }
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129 data = leafValueGet(i1, i2 ^ fixup, i3);
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130 if (data == null) {
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131 return null;
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132 }
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133 if (o.equals(data)) {
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134 return (T)data;
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135 }
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136 }
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137 dump();
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138 throw new IllegalStateException(String.format("[%d,%d,%d] hash: 0x%X, hash2: 0x%X, %s", i1, i2, i3, o.hashCode(), hash, o));
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139 }
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140
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141 public int size() {
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142 return size;
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143 }
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144 private LeafBranch leafBranchPut(int i1, int i2) {
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145 IndexBranch l2 = level2[i1];
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146 if (l2 == null) {
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147 level2[i1] = l2 = new IndexBranch();
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148 }
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149 LeafBranch l3 = l2.leafs[i2];
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150 if (l3 == null) {
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151 l2.leafs[i2] = l3 = new LeafBranch();
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152 }
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153 return l3;
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154 }
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155
264
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156 // unlike regular collection clear, keeps all allocated arrays to minimize gc/reallocate costs
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157 // do force clean, use #drop
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158 public void clear() {
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159 for (int i1 = 0; i1 < level2.length; i1++) {
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160 IndexBranch l2 = level2[i1];
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161 if (l2 == null) {
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162 continue;
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163 }
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164 for (int i2 = 0; i2 < l2.leafs.length; i2++) {
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165 LeafBranch l3 = l2.leafs[i2];
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166 if (l3 == null) {
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167 continue;
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168 }
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169 for (int i3 = 0; i3 < l3.data.length; i3++) {
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170 l3.data[i3] = null;
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171 }
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172 }
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173 }
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174 reset();
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175 }
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176
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177 public void drop() {
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178 reset();
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179 for (int i1 = 0; i1 < level2.length; level2[i1++] = null);
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180 }
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181
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182 private void reset() {
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183 size = 0;
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184 directPut = neighborPut = 0;
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185 Arrays.fill(fixupPut1, 0);
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186 Arrays.fill(fixupPut2, 0);
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187 }
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188
260
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189 private LeafBranch leafBranchGet(int i1, int i2) {
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190 IndexBranch l2 = level2[i1];
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191 if (l2 == null) {
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192 return null;
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193 }
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194 return l2.leafs[i2];
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195 }
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196
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197 private Object leafValueGet(int i1, int i2, int i3) {
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198 IndexBranch l2 = level2[i1];
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199 if (l2 == null) {
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200 return null;
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201 }
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202 LeafBranch l3 = l2.leafs[i2];
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203 if (l3 == null) {
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204 return null;
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205 }
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206 return l3.data[i3];
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207 }
264
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208
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209 private int hash(Object o) {
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210 int h = o.hashCode();
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211 // HashMap.newHash()
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212 h ^= (h >>> 20) ^ (h >>> 12);
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213 return h ^ (h >>> 7) ^ (h >>> 4);
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214 }
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215
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216 @Override
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217 public String toString() {
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218 return String.format("SparseSet (0x%02X-0x%02X-0x%02X), %d elements. Direct: %d. Resolutions: neighbour: %d, i1: %s. i2: %s", I1_MASK, I2_MASK, I3_MASK, size, directPut, neighborPut, Arrays.toString(fixupPut1), Arrays.toString(fixupPut2));
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219 }
260
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220
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221 public void dump() {
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222 int count = 0;
264
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223 System.out.println(toString());
260
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224 for (int i = 0; i < level2.length; i++) {
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225 IndexBranch l2 = level2[i];
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226 if (l2 == null) {
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227 continue;
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228 }
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229 for (int j = 0; j < l2.leafs.length; j++) {
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230 LeafBranch l3 = l2.leafs[j];
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231 if (l3 == null) {
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232 continue;
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233 }
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234 for (int k = 0; k < l3.data.length; k++) {
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235 Object d = l3.data[k];
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236 if (d != null) {
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237 System.out.printf("[%3d,%3d,%3d] %s\n", i,j,k,d);
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238 count++;
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239 }
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240 }
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241 }
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242 }
264
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243 System.out.printf("Total: %d elements\n", count);
260
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244 }
264
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245
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246 private static class IndexBranch {
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247 private final LeafBranch[] leafs = new LeafBranch[64];
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248 }
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249
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250 private static final class LeafBranch {
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251 public final Object[] data = new Object[64];
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252
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253 public int put(int ix, Object d) {
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254 if (putIfEmptyOrSame(ix, d)) {
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255 return 1;
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256 }
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257 // try neighbour elements
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258 if (putIfEmptyOrSame(ix ^ 0x1, d) || putIfEmptyOrSame(ix ^ 0x2, d) || putIfEmptyOrSame(ix ^ 0x3, d)) {
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259 return 2;
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260 }
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261 return 0;
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262 }
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263
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264 public boolean putIfEmptyOrSame(int ix, Object d) {
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265 if (data[ix] == null || data[ix].equals(d)) {
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266 data[ix] = d;
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267 return true;
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268 }
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269 return false;
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270 }
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271
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272 /**
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273 * <code>null</code> result indicates further checks make sense
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274 * @return <code>this</code> if there's no entry at all, <code>null</code> if entry doesn't match, or entry value itself otherwise
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275 */
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276 public Object get(int ix, Object o) {
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277 if (data[ix] == null) {
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278 return this;
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279 }
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280 if (data[ix].equals(o)) {
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281 return data[ix];
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282 }
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283 return null;
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284 }
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285 }
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286
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287 //
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288 // 8 bits per level
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289 // int i1 = (hash >>> 24) & 0xFF, i2 = (hash >>> 16) & 0xFF , i3 = (hash >>> 8) & 0xFF, i4 = hash & 0xFF;
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290 //
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291 // 10, 8, 8 and 6 bits
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292 // final int i1 = (hash >>> 22) & 0x3FF, i2 = (hash >>> 14) & 0xFF , i3 = (hash >>> 6) & 0xFF, i4 = hash & 0x3F;
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293 //
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294 // 8, 6, 6, 6, 6
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295 // 10, 6, 6, 6, 4
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296 //
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297 // 6, 5, 5, 5 = 21 bit
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298 // hash = hash ^ (hash >>> 24); // incorporate upper byte we don't use into lower to value it
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299 //final int i1 = (hash >>> 18) & 0x3F, i2 = (hash >>> 12) & 0x1F , i3 = (hash >>> 7) & 0x1F, i4 = (hash >>> 2) & 0x1F;
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300 // 6, 5, 5
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301 //hash = hash ^ (hash >>> 16);
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302 //final int i1 = (hash >>> 10) & 0x3F, i2 = (hash >>> 5) & 0x1F , i3 = hash & 0x1F;
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303 //
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304 // 6, 6, 6
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305 //final int i1 = (hash >>> 15) & 0x3F, i2 = (hash >>> 6) & 0x3F , i3 = hash & 0x3F;
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306 //
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307 // 8, 5, 5
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308
260
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309 }