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annotate src/org/tmatesoft/hg/repo/HgParentChildMap.java @ 679:19f5167c2155

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HgParentChildMap: deduce common ancestor functionality
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 20 Jul 2013 17:40:52 +0200
parents d2552e6a5af6
children
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 java.util.ArrayList;
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20 import java.util.Arrays;
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21 import java.util.BitSet;
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22 import java.util.Collection;
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23 import java.util.Collections;
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24 import java.util.HashSet;
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25 import java.util.LinkedList;
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26 import java.util.List;
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28 import org.tmatesoft.hg.core.Nodeid;
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29 import org.tmatesoft.hg.internal.ArrayHelper;
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30 import org.tmatesoft.hg.internal.IntMap;
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31 import org.tmatesoft.hg.repo.Revlog.ParentInspector;
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32
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33 /**
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34 * Helper class to deal with parent-child relationship between revisions <i>en masse</i>.
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35 * Works in terms of {@link Nodeid nodeids}, there's no need to deal with revision indexes.
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36 * For a given revision, answers questions like "who's my parent and what are my immediate children".
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37 *
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38 * <p>Comes handy when multiple revisions are analyzed and distinct {@link Revlog#parents(int, int[], byte[], byte[])}
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39 * queries are ineffective.
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40 *
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41 * <p>Next code snippet shows typical use:
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42 * <pre>
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43 * HgChangelog clog = repo.getChangelog();
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44 * ParentWalker&lt;HgChangelog> pw = new ParentWalker&lt;HgChangelog>(clog);
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45 * pw.init();
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46 *
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47 * Nodeid me = Nodeid.fromAscii("...");
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48 * List<Nodei> immediateChildren = pw.directChildren(me);
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49 * </pre>
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50 *
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51 * <p>Note, this map represents a snapshot of repository state at specific point, and is not automatically
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52 * updated/refreshed along with repository changes. I.e. any revision committed after this map was initialized
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53 * won't be recognized as known.
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54 *
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55 * <p> Perhaps, later may add alternative way to access (and reuse) map instance, Revlog#getParentWalker(),
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56 * that instantiates and initializes ParentWalker, and keep SoftReference to allow its reuse.
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57 *
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58 * @see HgRevisionMap
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59 *
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60 * @author Artem Tikhomirov
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61 * @author TMate Software Ltd.
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62 */
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63 public final class HgParentChildMap<T extends Revlog> implements ParentInspector {
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64
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65 // IMPORTANT: Nodeid instances shall be shared between all arrays
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66
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67 private final T revlog;
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68 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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69 private Nodeid[] sorted; // for binary search, just an origin of the actual value in use, the one inside seqWrapper
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70 private Nodeid[] firstParent; // parents by natural order (i.e. firstParent[A] is parent of revision with index A)
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71 private Nodeid[] secondParent;
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72 private IntMap<Nodeid> heads;
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73 private BitSet headsBitSet; // 1 indicates revision got children, != null only during init;
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74 private HgRevisionMap<T> revisionIndexMap;
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75 private ArrayHelper<Nodeid> seqWrapper;
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78 public HgParentChildMap(T owner) {
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79 revlog = owner;
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80 }
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81
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82 public HgRepository getRepo() {
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83 return revlog.getRepo();
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84 }
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85
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86 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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87 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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88 throw new IllegalStateException(); // sanity, revisions are sequential
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89 }
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90 int ix = revisionNumber;
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91 sequential[ix] = sorted[ix] = revision;
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92 if (parent1Revision != -1) {
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93 firstParent[ix] = sequential[parent1Revision];
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94 headsBitSet.set(parent1Revision);
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95 }
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96 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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97 secondParent[ix] = sequential[parent2Revision];
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98 headsBitSet.set(parent2Revision);
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99 }
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100 }
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101
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102 /**
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103 * Prepare (initialize or update) the map. Once {@link HgParentChildMap} was initialized, it keeps snapshot
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104 * of repository state. New revisions committed to the repository are not visible. To update the map, call
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105 * {@link #init()} once again, it tries to refresh in effective way, and to bring in only relevant changes.
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106 *
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107 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em>
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108 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em>
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109 */
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110 public void init() throws HgRuntimeException {
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111 final int revisionCount = revlog.getRevisionCount();
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112 Nodeid[] oldSequential = null, oldFirstParent = null, oldSecondParent = null, oldSorted = null;
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113 if (sequential != null && sequential.length > 0 && sequential.length < revisionCount) {
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114 int lastRecordedRevIndex = sequential.length-1;
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115 if (sequential[lastRecordedRevIndex].equals(revlog.getRevision(lastRecordedRevIndex))) {
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116 oldSequential = sequential;
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117 oldFirstParent = firstParent;
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118 oldSecondParent = secondParent;
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119 oldSorted = sorted;
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120 // not sure if there's a benefit in keeping sorted. assume quite some of them
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121 // might end up on the same place and thus minimize rearrangements
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122 }
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123 }
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124 firstParent = new Nodeid[revisionCount];
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125 // TODO [post 1.1] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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126 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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127 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant).
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128 // FWIW: in cpython's repo, with 70k+ revisions, there are 2618 values in secondParent
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129 secondParent = new Nodeid[revisionCount];
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130 //
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131 sequential = new Nodeid[revisionCount];
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132 sorted = new Nodeid[revisionCount];
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133 headsBitSet = new BitSet(revisionCount);
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134 if (oldSequential != null) {
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135 assert oldFirstParent.length == oldSequential.length;
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136 assert oldSecondParent.length == oldSequential.length;
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137 assert oldSorted.length == oldSequential.length;
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138 System.arraycopy(oldSequential, 0, sequential, 0, oldSequential.length);
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139 System.arraycopy(oldFirstParent, 0, firstParent, 0, oldFirstParent.length);
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140 System.arraycopy(oldSecondParent, 0, secondParent, 0, oldSecondParent.length);
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141 System.arraycopy(oldSorted, 0, sorted, 0, oldSorted.length);
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142 // restore old heads so that new one are calculated correctly
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143 headsBitSet.set(0, oldSequential.length);
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144 for (int headIndex : heads.keys()) {
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145 headsBitSet.clear(headIndex);
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146 }
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147 }
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148 revlog.indexWalk(oldSequential == null ? 0 : oldSequential.length, revisionCount-1, this);
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149 seqWrapper = new ArrayHelper<Nodeid>(sequential);
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150 // HgRevisionMap doesn't keep sorted, try alternative here.
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151 // reference this.sorted (not only from ArrayHelper) helps to track ownership in hprof/mem dumps
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152 seqWrapper.sort(sorted, false, true);
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153 // no reason to keep BitSet, number of heads is usually small
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154 IntMap<Nodeid> _heads = new IntMap<Nodeid>(revisionCount - headsBitSet.cardinality());
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155 int index = 0;
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156 while (index < sequential.length) {
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157 index = headsBitSet.nextClearBit(index);
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158 // nextClearBit(length-1) gives length when bit is set,
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159 // however, last revision can't be a parent of any other, and
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160 // the last bit would be always 0, and no AIOOBE
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161 _heads.put(index, sequential[index]);
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162 index++;
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163 }
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164 headsBitSet = null;
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165 heads = _heads;
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166 }
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167
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168 private static void assertSortedIndex(int x) {
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169 if (x < 0) {
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170 throw new HgInvalidStateException(String.format("Bad index %d", x));
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171 }
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172 }
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173
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174 /**
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175 * Tells whether supplied revision is from the walker's associated revlog.
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176 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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177 * @param nid revision to check, not <code>null</code>
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178 * @return <code>true</code> if revision matches any revision in this revlog
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179 */
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180 public boolean knownNode(Nodeid nid) {
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181 return seqWrapper.binarySearchSorted(nid) >= 0;
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182 }
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183
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184 /**
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185 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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186 */
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187 public Nodeid firstParent(Nodeid nid) {
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188 int x = seqWrapper.binarySearchSorted(nid);
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189 assertSortedIndex(x);
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190 int i = seqWrapper.getReverseIndex(x);
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191 return firstParent[i];
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192 }
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193
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194 // never null, Nodeid.NULL if none known
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195 public Nodeid safeFirstParent(Nodeid nid) {
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196 Nodeid rv = firstParent(nid);
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197 return rv == null ? Nodeid.NULL : rv;
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198 }
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199
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200 public Nodeid secondParent(Nodeid nid) {
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201 int x = seqWrapper.binarySearchSorted(nid);
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202 assertSortedIndex(x);
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203 int i = seqWrapper.getReverseIndex(x);
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204 return secondParent[i];
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205 }
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206
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207 public Nodeid safeSecondParent(Nodeid nid) {
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208 Nodeid rv = secondParent(nid);
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209 return rv == null ? Nodeid.NULL : rv;
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210 }
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211
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212 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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213 int x = seqWrapper.binarySearchSorted(nid);
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214 assertSortedIndex(x);
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215 int i = seqWrapper.getReverseIndex(x);
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216 Nodeid p1 = firstParent[i];
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217 boolean modified = false;
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218 if (p1 != null) {
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219 modified = c.add(p1);
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220 }
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221 Nodeid p2 = secondParent[i];
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222 if (p2 != null) {
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223 modified = c.add(p2) || modified;
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224 }
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225 return modified;
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226 }
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227
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228 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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229 // nodes, their parents and so on.
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230
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231 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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232 // Nodeids shall belong to this revlog
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233 public List<Nodeid> childrenOf(Collection<Nodeid> roots) {
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234 if (roots.isEmpty()) {
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235 return Collections.emptyList();
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236 }
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237 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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238 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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239 int earliestRevision = Integer.MAX_VALUE;
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240 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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241 // first, find earliest index of roots in question, as there's no sense
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242 // to check children among nodes prior to branch's root node
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243 for (Nodeid r : roots) {
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244 int x = seqWrapper.binarySearchSorted(r);
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245 assertSortedIndex(x);
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246 int i = seqWrapper.getReverseIndex(x);
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247 if (i < earliestRevision) {
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248 earliestRevision = i;
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249 }
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250 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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251 }
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252 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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253 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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254 parents.add(sequential[i]); // to find next child
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255 result.add(sequential[i]);
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256 }
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257 }
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258 return result;
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259 }
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260
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261 /**
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262 * @return revisions that have supplied revision as their immediate parent
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263 */
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264 public List<Nodeid> directChildren(Nodeid nid) {
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265 int x = seqWrapper.binarySearchSorted(nid);
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266 assertSortedIndex(x);
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267 int start = seqWrapper.getReverseIndex(x);
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268 nid = sequential[start]; // canonical instance
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269 if (!hasChildren(start)) {
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270 return Collections.emptyList();
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271 }
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272 ArrayList<Nodeid> result = new ArrayList<Nodeid>(5);
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273 for (int i = start + 1; i < sequential.length; i++) {
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274 if (nid == firstParent[i] || nid == secondParent[i]) {
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275 result.add(sequential[i]);
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276 }
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277 }
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278 return result;
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279 }
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280
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281 /**
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282 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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283 * @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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284 */
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285 public boolean hasChildren(Nodeid nid) {
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286 int x = seqWrapper.binarySearchSorted(nid);
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287 assertSortedIndex(x);
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288 int i = seqWrapper.getReverseIndex(x);
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289 return hasChildren(i);
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290 }
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291
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292 /**
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293 * @return all revisions this map knows about
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294 */
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295 public List<Nodeid> all() {
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296 return Arrays.asList(sequential);
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297 }
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298
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299 /**
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300 * Find out whether a given node is among descendants of another.
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301 *
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302 * @param root revision to check for being (grand-)*parent of a child
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303 * @param wannaBeChild candidate descendant revision
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304 * @return <code>true</code> if <code>wannaBeChild</code> is among children of <code>root</code>
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305 */
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306 public boolean isChild(Nodeid root, Nodeid wannaBeChild) {
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307 int x = seqWrapper.binarySearchSorted(root);
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308 assertSortedIndex(x);
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309 final int start = seqWrapper.getReverseIndex(x);
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310 root = sequential[start]; // canonical instance
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311 if (!hasChildren(start)) {
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312 return false; // root got no children at all
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313 }
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314 int y = seqWrapper.binarySearchSorted(wannaBeChild);
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315 if (y < 0) {
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316 return false; // not found
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317 }
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318 final int end = seqWrapper.getReverseIndex(y);
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319 wannaBeChild = sequential[end]; // canonicalize
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320 if (end <= start) {
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321 return false; // potential child was in repository earlier than root
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322 }
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323 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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324 parents.add(root);
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325 for (int i = start + 1; i < end; i++) {
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326 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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327 parents.add(sequential[i]); // collect ancestors line
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328 }
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329 }
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330 return parents.contains(firstParent[end]) || parents.contains(secondParent[end]);
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331 }
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332
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333 /**
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334 * @return elements of this map that do not have a child recorded therein.
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335 */
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336 public Collection<Nodeid> heads() {
656
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337 return heads.values();
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338 }
657
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339
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340 /**
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341 * @return map of revision to indexes
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342 */
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343 public HgRevisionMap<T> getRevisionMap() {
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344 if (revisionIndexMap == null) {
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345 revisionIndexMap = new HgRevisionMap<T>(revlog);
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346 revisionIndexMap.init(seqWrapper);
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347 }
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348 return revisionIndexMap;
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349 }
679
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350
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351 /**
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352 * @return common ancestor of two revisions
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353 */
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354 public Nodeid ancestor(Nodeid r1, Nodeid r2) {
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355 if (r1.equals(r2)) {
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356 return r1;
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357 }
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358 BitSet a1 = buildAncestors(r1);
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359 BitSet a2 = buildAncestors(r2);
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360 // BitSet.and() trims to shorter bitset, it's ok as we are not
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361 // interested in bits that are part of one bitset only
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362 a1.and(a2);
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363 final int cardinality = a1.cardinality();
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364 if (cardinality == 1) {
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365 return sequential[a1.nextSetBit(0)];
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366 }
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367 assert cardinality > 0; // every revision is child of at least rev0
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368 final int length = sequential.length;
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369 int index = length / 2;
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370 int lastBitSet = -1;
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371 do {
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372 int nextSetBit = a1.nextSetBit(index);
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373 int nextIndex;
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374 if (nextSetBit == -1) {
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375 assert lastBitSet == -1 || lastBitSet <= index;
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376 nextIndex = index - (index - (lastBitSet == -1 ? 0 : lastBitSet)) / 2;
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377 } else {
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378 lastBitSet = nextSetBit;
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379 nextIndex = lastBitSet + (length - lastBitSet) / 2;
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380 }
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381 if (nextIndex == index) {
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382 break;
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383 }
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384 index = nextIndex;
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385 } while (true);
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386 if (lastBitSet == -1) {
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387 assert false; // likely error in the algorithm above (e.g. can't reach index==0)
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388 return sequential[0];
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389 }
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390 return sequential[lastBitSet];
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391 }
652
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392
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393 private boolean hasChildren(int sequentialIndex) {
656
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394 return !heads.containsKey(sequentialIndex);
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395 }
679
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396
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397 private BitSet buildAncestors(Nodeid nid) {
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398 int x = seqWrapper.binarySearchSorted(nid);
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399 assertSortedIndex(x);
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400 int i = seqWrapper.getReverseIndex(x);
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401 BitSet rv = new BitSet(sequential.length);
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402 HashSet<Nodeid> ancestors = new HashSet<Nodeid>();
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403 ancestors.add(nid);
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404 do {
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405 if (ancestors.contains(sequential[i])) {
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406 rv.set(i);
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407 if(firstParent[i] != null) {
19f5167c2155 HgParentChildMap: deduce common ancestor functionality
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408 ancestors.add(firstParent[i]);
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409 }
19f5167c2155 HgParentChildMap: deduce common ancestor functionality
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410 if (secondParent[i] != null) {
19f5167c2155 HgParentChildMap: deduce common ancestor functionality
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411 ancestors.add(secondParent[i]);
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412 }
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413 }
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414 i--;
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415 } while (i >= 0);
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416 return rv;
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417 }
432
1fc0da631200 Revlog.ParentWalker helper class got promoted as TLC, renamed to HgParentChildMap
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418 }