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annotate src/org/tmatesoft/hg/repo/HgParentChildMap.java @ 655:bcbcc318f250

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Performance: reuse unzip output buffer
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 04 Jul 2013 18:36:38 +0200
parents 629a7370554c
children a937e63b6e02
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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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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30 import org.tmatesoft.hg.core.Nodeid;
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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 *
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52 * <p> Perhaps, later may add alternative way to access (and reuse) map instance, Revlog#getParentWalker(),
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53 * that instantiates and initializes ParentWalker, and keep SoftReference to allow its reuse.
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54 *
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55 * @see HgRevisionMap
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56 *
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57 * @author Artem Tikhomirov
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58 * @author TMate Software Ltd.
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59 */
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60 public final class HgParentChildMap<T extends Revlog> implements ParentInspector {
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61
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62 // IMPORTANT: Nodeid instances shall be shared between all arrays
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63
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64 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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65 private Nodeid[] sorted; // for binary search
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66 private int[] sorted2natural; // indexes in sorted to indexes in sequential
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67 private Nodeid[] firstParent; // parents by natural order (i.e. firstParent[A] is parent of revision with index A)
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68 private Nodeid[] secondParent;
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69 private final T revlog;
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70 private BitSet heads; // 1 indicates revision got children
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73 public HgParentChildMap(T owner) {
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74 revlog = owner;
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75 }
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76
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77 public HgRepository getRepo() {
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78 return revlog.getRepo();
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79 }
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80
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81 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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82 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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83 throw new IllegalStateException(); // sanity, revisions are sequential
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84 }
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85 int ix = revisionNumber;
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86 sequential[ix] = sorted[ix] = revision;
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87 if (parent1Revision != -1) {
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88 firstParent[ix] = sequential[parent1Revision];
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89 heads.set(parent1Revision);
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90 }
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91 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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92 secondParent[ix] = sequential[parent2Revision];
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93 heads.set(parent2Revision);
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94 }
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95 }
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96
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97 /**
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98 * Prepare the map
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99 * @throws HgInvalidControlFileException if failed to access revlog index/data entry. <em>Runtime exception</em>
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100 * @throws HgRuntimeException subclass thereof to indicate other issues with the library. <em>Runtime exception</em>
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101 */
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102 public void init() throws HgRuntimeException {
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103 final int revisionCount = revlog.getRevisionCount();
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104 firstParent = new Nodeid[revisionCount];
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105 // TODO [post 1.1] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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106 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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107 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant)
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108 secondParent = new Nodeid[revisionCount];
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109 //
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110 sequential = new Nodeid[revisionCount];
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111 sorted = new Nodeid[revisionCount];
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112 heads = new BitSet(revisionCount);
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113 revlog.indexWalk(0, TIP, this);
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diff changeset
114 Arrays.sort(sorted);
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115 // FIXME use ArrayHelper instead
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116 sorted2natural = new int[revisionCount];
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117 for (int i = 0; i < revisionCount; i++) {
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118 Nodeid n = sequential[i];
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119 int x = Arrays.binarySearch(sorted, n);
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120 assertSortedIndex(x);
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121 sorted2natural[x] = i;
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122 }
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123 }
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124
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125 private void assertSortedIndex(int x) {
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126 if (x < 0) {
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127 throw new HgInvalidStateException(String.format("Bad index", x));
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128 }
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129 }
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130
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131 /**
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132 * Tells whether supplied revision is from the walker's associated revlog.
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133 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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134 * @param nid revision to check, not <code>null</code>
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135 * @return <code>true</code> if revision matches any revision in this revlog
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136 */
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137 public boolean knownNode(Nodeid nid) {
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138 return Arrays.binarySearch(sorted, nid) >= 0;
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139 }
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140
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141 /**
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142 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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143 */
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144 public Nodeid firstParent(Nodeid nid) {
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145 int x = Arrays.binarySearch(sorted, nid);
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146 assertSortedIndex(x);
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147 int i = sorted2natural[x];
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148 return firstParent[i];
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149 }
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150
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151 // never null, Nodeid.NULL if none known
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152 public Nodeid safeFirstParent(Nodeid nid) {
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153 Nodeid rv = firstParent(nid);
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154 return rv == null ? Nodeid.NULL : rv;
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155 }
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156
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157 public Nodeid secondParent(Nodeid nid) {
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158 int x = Arrays.binarySearch(sorted, nid);
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159 assertSortedIndex(x);
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160 int i = sorted2natural[x];
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161 return secondParent[i];
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162 }
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163
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164 public Nodeid safeSecondParent(Nodeid nid) {
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165 Nodeid rv = secondParent(nid);
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166 return rv == null ? Nodeid.NULL : rv;
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167 }
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168
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169 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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170 int x = Arrays.binarySearch(sorted, nid);
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171 assertSortedIndex(x);
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172 int i = sorted2natural[x];
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173 Nodeid p1 = firstParent[i];
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174 boolean modified = false;
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175 if (p1 != null) {
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176 modified = c.add(p1);
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177 }
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178 Nodeid p2 = secondParent[i];
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179 if (p2 != null) {
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180 modified = c.add(p2) || modified;
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181 }
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182 return modified;
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183 }
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184
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185 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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186 // nodes, their parents and so on.
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187
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188 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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189 // Nodeids shall belong to this revlog
650
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190 public List<Nodeid> childrenOf(Collection<Nodeid> roots) {
645
14dac192aa26 Push: phase2 - upload bundle with changes to remote server
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diff changeset
191 if (roots.isEmpty()) {
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192 return Collections.emptyList();
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193 }
432
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194 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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195 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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196 int earliestRevision = Integer.MAX_VALUE;
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197 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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198 // first, find earliest index of roots in question, as there's no sense
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199 // to check children among nodes prior to branch's root node
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diff changeset
200 for (Nodeid r : roots) {
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diff changeset
201 int x = Arrays.binarySearch(sorted, r);
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202 assertSortedIndex(x);
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diff changeset
203 int i = sorted2natural[x];
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204 if (i < earliestRevision) {
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diff changeset
205 earliestRevision = i;
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206 }
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diff changeset
207 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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208 }
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209 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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210 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
211 parents.add(sequential[i]); // to find next child
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diff changeset
212 result.add(sequential[i]);
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213 }
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214 }
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215 return result;
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216 }
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217
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218 /**
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219 * @return revisions that have supplied revision as their immediate parent
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220 */
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diff changeset
221 public List<Nodeid> directChildren(Nodeid nid) {
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222 int x = Arrays.binarySearch(sorted, nid);
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223 assertSortedIndex(x);
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diff changeset
224 nid = sorted[x]; // canonical instance
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diff changeset
225 int start = sorted2natural[x];
653
629a7370554c Tests for recent changes in HgParentChildMap and RepositoryComparator (outgoing to respect drafts and Issue 47)
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diff changeset
226 if (!hasChildren(start)) {
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diff changeset
227 return Collections.emptyList();
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228 }
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diff changeset
229 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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230 for (int i = start + 1; i < sequential.length; i++) {
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231 if (nid == firstParent[i] || nid == secondParent[i]) {
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232 result.add(sequential[i]);
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233 }
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234 }
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235 return result;
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236 }
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237
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238 /**
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239 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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240 * @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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241 */
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242 public boolean hasChildren(Nodeid nid) {
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243 int x = Arrays.binarySearch(sorted, nid);
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244 assertSortedIndex(x);
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245 int i = sorted2natural[x];
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246 return hasChildren(i);
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247 }
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248
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249 /**
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250 * @return all revisions this map knows about
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251 */
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252 public List<Nodeid> all() {
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253 return Arrays.asList(sequential);
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254 }
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255
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256 /**
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257 * Find out whether a given node is among descendants of another.
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258 *
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259 * @param root revision to check for being (grand-)*parent of a child
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260 * @param wannaBeChild candidate descendant revision
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261 * @return <code>true</code> if <code>wannaBeChild</code> is among children of <code>root</code>
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262 */
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263 public boolean isChild(Nodeid root, Nodeid wannaBeChild) {
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264 int x = Arrays.binarySearch(sorted, root);
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265 assertSortedIndex(x);
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266 root = sorted[x]; // canonical instance
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267 final int start = sorted2natural[x];
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268 if (!hasChildren(start)) {
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269 return false; // root got no children at all
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270 }
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271 int y = Arrays.binarySearch(sorted, wannaBeChild);
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272 if (y < 0) {
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273 return false; // not found
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274 }
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275 wannaBeChild = sorted[y]; // canonicalize
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276 final int end = sorted2natural[y];
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277 if (end <= start) {
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278 return false; // potential child was in repository earlier than root
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279 }
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280 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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281 parents.add(root);
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282 for (int i = start + 1; i < end; i++) {
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283 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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284 parents.add(sequential[i]); // collect ancestors line
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285 }
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286 }
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287 return parents.contains(firstParent[end]) || parents.contains(secondParent[end]);
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288 }
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289
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290 /**
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291 * @return elements of this map that do not have a child recorded therein.
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292 */
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293 public Collection<Nodeid> heads() {
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294 ArrayList<Nodeid> result = new ArrayList<Nodeid>();
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295 int index = 0;
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296 do {
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297 index = heads.nextClearBit(index);
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298 // nextClearBit(length-1) gives length when bit is set,
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299 // however, last revision can't be a parent of any other, and
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300 // the last bit would be always 0, and no AIOOBE
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301 result.add(sequential[index]);
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302 index++;
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303 } while (index < sequential.length);
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304 return result;
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305 }
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306
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307 private boolean hasChildren(int sequentialIndex) {
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308 return heads.get(sequentialIndex);
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309 }
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310 }