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annotate src/org/tmatesoft/hg/repo/HgParentChildMap.java @ 656:a937e63b6e02

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Performance: rebuild information about branches takes too long (my improvement: 3 times, 11-15 s to less than 4 sec)
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 04 Jul 2013 18:40:03 +0200
parents 629a7370554c
children 6334b0267103
rev   line source
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1 /*
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2 * Copyright (c) 2011-2013 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.repo;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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20
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21 import java.util.ArrayList;
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22 import java.util.Arrays;
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23 import java.util.BitSet;
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24 import java.util.Collection;
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25 import java.util.Collections;
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26 import java.util.HashSet;
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27 import java.util.LinkedList;
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28 import java.util.List;
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29
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30 import org.tmatesoft.hg.core.Nodeid;
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31 import org.tmatesoft.hg.internal.IntMap;
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32 import org.tmatesoft.hg.repo.Revlog.ParentInspector;
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33
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34 /**
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35 * Helper class to deal with parent-child relationship between revisions <i>en masse</i>.
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36 * Works in terms of {@link Nodeid nodeids}, there's no need to deal with revision indexes.
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37 * For a given revision, answers questions like "who's my parent and what are my immediate children".
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38 *
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39 * <p>Comes handy when multiple revisions are analyzed and distinct {@link Revlog#parents(int, int[], byte[], byte[])}
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40 * queries are ineffective.
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41 *
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42 * <p>Next code snippet shows typical use:
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43 * <pre>
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44 * HgChangelog clog = repo.getChangelog();
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45 * ParentWalker&lt;HgChangelog> pw = new ParentWalker&lt;HgChangelog>(clog);
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46 * pw.init();
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47 *
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48 * Nodeid me = Nodeid.fromAscii("...");
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49 * List<Nodei> immediateChildren = pw.directChildren(me);
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50 * </pre>
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51 *
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52 *
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53 * <p> Perhaps, later may add alternative way to access (and reuse) map instance, Revlog#getParentWalker(),
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54 * that instantiates and initializes ParentWalker, and keep SoftReference to allow its reuse.
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55 *
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56 * @see HgRevisionMap
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57 *
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58 * @author Artem Tikhomirov
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59 * @author TMate Software Ltd.
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60 */
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61 public final class HgParentChildMap<T extends Revlog> implements ParentInspector {
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62
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63 // IMPORTANT: Nodeid instances shall be shared between all arrays
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64
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65 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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66 private Nodeid[] sorted; // for binary search
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67 private int[] sorted2natural; // indexes in sorted to indexes in sequential
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68 private Nodeid[] firstParent; // parents by natural order (i.e. firstParent[A] is parent of revision with index A)
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69 private Nodeid[] secondParent;
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70 private final T revlog;
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71 private IntMap<Nodeid> heads;
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72 private BitSet headsBitSet; // 1 indicates revision got children, != null only during init;
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73
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75 public HgParentChildMap(T owner) {
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76 revlog = owner;
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77 }
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78
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79 public HgRepository getRepo() {
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80 return revlog.getRepo();
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81 }
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82
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83 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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84 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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85 throw new IllegalStateException(); // sanity, revisions are sequential
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86 }
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87 int ix = revisionNumber;
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88 sequential[ix] = sorted[ix] = revision;
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89 if (parent1Revision != -1) {
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90 firstParent[ix] = sequential[parent1Revision];
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91 headsBitSet.set(parent1Revision);
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92 }
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93 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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94 secondParent[ix] = sequential[parent2Revision];
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95 headsBitSet.set(parent2Revision);
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96 }
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97 }
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98
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99 /**
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100 * Prepare the map
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101 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em>
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102 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em>
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103 */
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104 public void init() throws HgRuntimeException {
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105 final int revisionCount = revlog.getRevisionCount();
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106 firstParent = new Nodeid[revisionCount];
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107 // TODO [post 1.1] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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108 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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109 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant).
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110 // FWIW: in cpython's repo, with 70k+ revisions, there are 2618 values in secondParent
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111 secondParent = new Nodeid[revisionCount];
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diff changeset
112 //
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113 sequential = new Nodeid[revisionCount];
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114 sorted = new Nodeid[revisionCount];
656
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115 headsBitSet = new BitSet(revisionCount);
432
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116 revlog.indexWalk(0, TIP, this);
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117 Arrays.sort(sorted);
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118 // FIXME use ArrayHelper instead
432
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diff changeset
119 sorted2natural = new int[revisionCount];
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120 for (int i = 0; i < revisionCount; i++) {
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121 Nodeid n = sequential[i];
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122 int x = Arrays.binarySearch(sorted, n);
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123 assertSortedIndex(x);
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124 sorted2natural[x] = i;
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125 }
656
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126 // no reason to keep BitSet, number of heads is usually small
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127 IntMap<Nodeid> _heads = new IntMap<Nodeid>(headsBitSet.size() - headsBitSet.cardinality());
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128 int index = 0;
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129 while (index < sequential.length) {
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130 index = headsBitSet.nextClearBit(index);
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131 // nextClearBit(length-1) gives length when bit is set,
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132 // however, last revision can't be a parent of any other, and
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133 // the last bit would be always 0, and no AIOOBE
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134 _heads.put(index, sequential[index]);
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135 index++;
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136 }
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137 headsBitSet = null;
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138 heads = _heads;
432
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139 }
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140
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141 private void assertSortedIndex(int x) {
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142 if (x < 0) {
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143 throw new HgInvalidStateException(String.format("Bad index", x));
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144 }
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145 }
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146
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147 /**
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148 * Tells whether supplied revision is from the walker's associated revlog.
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149 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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150 * @param nid revision to check, not <code>null</code>
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151 * @return <code>true</code> if revision matches any revision in this revlog
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152 */
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153 public boolean knownNode(Nodeid nid) {
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154 return Arrays.binarySearch(sorted, nid) >= 0;
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155 }
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156
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157 /**
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158 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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159 */
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160 public Nodeid firstParent(Nodeid nid) {
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161 int x = Arrays.binarySearch(sorted, nid);
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162 assertSortedIndex(x);
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163 int i = sorted2natural[x];
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164 return firstParent[i];
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165 }
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166
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167 // never null, Nodeid.NULL if none known
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168 public Nodeid safeFirstParent(Nodeid nid) {
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169 Nodeid rv = firstParent(nid);
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170 return rv == null ? Nodeid.NULL : rv;
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171 }
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172
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173 public Nodeid secondParent(Nodeid nid) {
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174 int x = Arrays.binarySearch(sorted, nid);
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175 assertSortedIndex(x);
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176 int i = sorted2natural[x];
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177 return secondParent[i];
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178 }
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179
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180 public Nodeid safeSecondParent(Nodeid nid) {
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181 Nodeid rv = secondParent(nid);
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182 return rv == null ? Nodeid.NULL : rv;
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183 }
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184
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185 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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186 int x = Arrays.binarySearch(sorted, nid);
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187 assertSortedIndex(x);
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188 int i = sorted2natural[x];
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189 Nodeid p1 = firstParent[i];
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190 boolean modified = false;
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191 if (p1 != null) {
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192 modified = c.add(p1);
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193 }
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194 Nodeid p2 = secondParent[i];
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195 if (p2 != null) {
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196 modified = c.add(p2) || modified;
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197 }
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198 return modified;
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199 }
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200
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diff changeset
201 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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202 // nodes, their parents and so on.
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203
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204 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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205 // Nodeids shall belong to this revlog
650
3b275cc2d2aa Push: phase4 - settle local and remote phases, push updated phases regardless of server publishing state, do not push secret changesets
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diff changeset
206 public List<Nodeid> childrenOf(Collection<Nodeid> roots) {
645
14dac192aa26 Push: phase2 - upload bundle with changes to remote server
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diff changeset
207 if (roots.isEmpty()) {
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diff changeset
208 return Collections.emptyList();
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diff changeset
209 }
432
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diff changeset
210 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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diff changeset
211 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
212 int earliestRevision = Integer.MAX_VALUE;
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diff changeset
213 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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214 // first, find earliest index of roots in question, as there's no sense
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diff changeset
215 // to check children among nodes prior to branch's root node
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diff changeset
216 for (Nodeid r : roots) {
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diff changeset
217 int x = Arrays.binarySearch(sorted, r);
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diff changeset
218 assertSortedIndex(x);
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diff changeset
219 int i = sorted2natural[x];
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220 if (i < earliestRevision) {
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diff changeset
221 earliestRevision = i;
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222 }
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diff changeset
223 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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224 }
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225 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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226 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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227 parents.add(sequential[i]); // to find next child
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228 result.add(sequential[i]);
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229 }
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230 }
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231 return result;
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232 }
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233
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234 public long AAA = 0;
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235
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236 /**
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237 * @return revisions that have supplied revision as their immediate parent
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238 */
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239 public List<Nodeid> directChildren(Nodeid nid) {
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240 int x = Arrays.binarySearch(sorted, nid);
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241 assertSortedIndex(x);
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242 nid = sorted[x]; // canonical instance
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243 int start = sorted2natural[x];
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244 if (!hasChildren(start)) {
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245 return Collections.emptyList();
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246 }
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247 ArrayList<Nodeid> result = new ArrayList<Nodeid>(5);
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248 for (int i = start + 1; i < sequential.length; i++) {
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249 AAA++;
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250 if (nid == firstParent[i] || nid == secondParent[i]) {
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251 result.add(sequential[i]);
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252 }
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253 }
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254 return result;
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255 }
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256
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257 /**
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258 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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259 * @return <code>true</code> if there's any node in this revlog that has specified node as one of its parents.
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260 */
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261 public boolean hasChildren(Nodeid nid) {
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262 int x = Arrays.binarySearch(sorted, nid);
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263 assertSortedIndex(x);
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264 int i = sorted2natural[x];
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265 return hasChildren(i);
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266 }
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267
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268 /**
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269 * @return all revisions this map knows about
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270 */
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271 public List<Nodeid> all() {
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272 return Arrays.asList(sequential);
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273 }
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274
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275 /**
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276 * Find out whether a given node is among descendants of another.
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277 *
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278 * @param root revision to check for being (grand-)*parent of a child
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279 * @param wannaBeChild candidate descendant revision
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280 * @return <code>true</code> if <code>wannaBeChild</code> is among children of <code>root</code>
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281 */
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282 public boolean isChild(Nodeid root, Nodeid wannaBeChild) {
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283 int x = Arrays.binarySearch(sorted, root);
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284 assertSortedIndex(x);
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285 root = sorted[x]; // canonical instance
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286 final int start = sorted2natural[x];
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287 if (!hasChildren(start)) {
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288 return false; // root got no children at all
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289 }
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290 int y = Arrays.binarySearch(sorted, wannaBeChild);
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291 if (y < 0) {
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292 return false; // not found
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293 }
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294 wannaBeChild = sorted[y]; // canonicalize
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295 final int end = sorted2natural[y];
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296 if (end <= start) {
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297 return false; // potential child was in repository earlier than root
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298 }
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299 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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300 parents.add(root);
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301 for (int i = start + 1; i < end; i++) {
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302 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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303 parents.add(sequential[i]); // collect ancestors line
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304 }
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305 }
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306 return parents.contains(firstParent[end]) || parents.contains(secondParent[end]);
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307 }
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308
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309 /**
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310 * @return elements of this map that do not have a child recorded therein.
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311 */
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312 public Collection<Nodeid> heads() {
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313 return heads.values();
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314 }
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315
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316 private boolean hasChildren(int sequentialIndex) {
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317 return !heads.containsKey(sequentialIndex);
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318 }
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319 }