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annotate src/org/tmatesoft/hg/repo/Revlog.java @ 416:d30083c80d52

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Better names - non-confusing and aligned with the rest of API
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 22 Mar 2012 19:11:33 +0100
parents 866fc3b597a0
children 528b6780a8bd
rev   line source
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1 /*
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2 * Copyright (c) 2010-2012 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.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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22
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23 import java.io.IOException;
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24 import java.nio.ByteBuffer;
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25 import java.util.ArrayList;
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26 import java.util.Arrays;
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27 import java.util.Collection;
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28 import java.util.HashSet;
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29 import java.util.LinkedList;
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30 import java.util.List;
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32 import org.tmatesoft.hg.core.HgBadStateException;
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33 import org.tmatesoft.hg.core.HgException;
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34 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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35 import org.tmatesoft.hg.core.HgInvalidRevisionException;
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36 import org.tmatesoft.hg.core.Nodeid;
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37 import org.tmatesoft.hg.internal.ArrayHelper;
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38 import org.tmatesoft.hg.internal.DataAccess;
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39 import org.tmatesoft.hg.internal.Experimental;
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40 import org.tmatesoft.hg.internal.Preview;
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41 import org.tmatesoft.hg.internal.RevlogStream;
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42 import org.tmatesoft.hg.util.Adaptable;
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43 import org.tmatesoft.hg.util.ByteChannel;
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44 import org.tmatesoft.hg.util.CancelSupport;
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45 import org.tmatesoft.hg.util.CancelledException;
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46 import org.tmatesoft.hg.util.LogFacility;
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47 import org.tmatesoft.hg.util.ProgressSupport;
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49
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50 /**
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51 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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52 *
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53 * Implementation note:
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54 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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55 * in public methods.
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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 abstract class Revlog {
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61
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62 private final HgRepository repo;
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63 protected final RevlogStream content;
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65 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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66 if (hgRepo == null) {
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67 throw new IllegalArgumentException();
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68 }
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69 if (contentStream == null) {
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70 throw new IllegalArgumentException();
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71 }
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72 repo = hgRepo;
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73 content = contentStream;
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74 }
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76 // invalid Revlog
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77 protected Revlog(HgRepository hgRepo) {
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78 repo = hgRepo;
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79 content = null;
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80 }
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81
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82 public final HgRepository getRepo() {
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83 return repo;
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84 }
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85
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86 public final int getRevisionCount() {
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87 return content.revisionCount();
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88 }
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89
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90 public final int getLastRevision() {
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91 return content.revisionCount() - 1;
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92 }
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93
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94 /**
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95 * Map revision index to unique revision identifier (nodeid).
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96 *
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97 * @param revision index of the entry in this revlog, may be {@link HgRepository#TIP}
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98 * @return revision nodeid of the entry
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99 *
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100 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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101 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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102 */
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103 public final Nodeid getRevision(int revision) throws HgInvalidRevisionException, HgInvalidControlFileException {
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104 // XXX cache nodeids? Rather, if context.getCache(this).getRevisionMap(create == false) != null, use it
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105 return Nodeid.fromBinary(content.nodeid(revision), 0);
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106 }
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107
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108 /**
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109 * FIXME need to be careful about (1) ordering of the revisions in the return list; (2) modifications (sorting) of the argument array
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110 */
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111 public final List<Nodeid> getRevisions(int... revisions) throws HgInvalidRevisionException, HgInvalidControlFileException {
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112 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length);
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113 Arrays.sort(revisions);
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114 getRevisionsInternal(rv, revisions);
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115 return rv;
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116 }
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117
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118 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) throws HgInvalidRevisionException, HgInvalidControlFileException {
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119 // once I have getRevisionMap and may find out whether it is avalable from cache,
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120 // may use it, perhaps only for small number of revisions
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121 content.iterate(sortedRevs, false, new RevlogStream.Inspector() {
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122
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123 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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124 retVal.add(Nodeid.fromBinary(nodeid, 0));
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125 }
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126 });
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127 }
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128
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129 /**
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130 * Get local index of the specified revision.
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131 * If unsure, use {@link #isKnown(Nodeid)} to find out whether nodeid belongs to this revlog.
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132 *
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133 * For occasional queries, this method works with decent performance, despite its O(n/2) approach.
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134 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link RevisionMap} may come handy.
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135 *
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136 * @param nid revision to look up
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137 * @return revision local index in this revlog
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138 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog
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139 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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140 */
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141 public final int getRevisionIndex(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
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142 int revision = content.findRevisionIndex(nid);
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143 if (revision == BAD_REVISION) {
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144 // using toString() to identify revlog. HgDataFile.toString includes path, HgManifest and HgChangelog instances
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145 // are fine with default (class name)
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146 // Perhaps, more tailored description method would be suitable here
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147 throw new HgInvalidRevisionException(String.format("Can't find revision %s in %s", nid.shortNotation(), this), nid, null);
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148 }
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149 return revision;
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150 }
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151
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152 /**
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153 * @deprecated use {@link #getRevisionIndex(Nodeid)} instead
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154 */
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155 @Deprecated
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156 public final int getLocalRevision(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
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157 return getRevisionIndex(nid);
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158 }
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159
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160
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161 /**
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162 * Note, {@link Nodeid#NULL} nodeid is not reported as known in any revlog.
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163 *
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164 * @param nodeid
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165 * @return
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166 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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167 */
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168 public final boolean isKnown(Nodeid nodeid) throws HgInvalidControlFileException {
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169 final int rn = content.findRevisionIndex(nodeid);
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170 if (BAD_REVISION == rn) {
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171 return false;
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172 }
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173 if (rn < 0 || rn >= content.revisionCount()) {
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174 // Sanity check
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175 throw new HgBadStateException(String.format("Revision index %d found for nodeid %s is not from the range [0..%d]", rn, nodeid.shortNotation(), content.revisionCount()-1));
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176 }
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177 return true;
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178 }
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179
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180 /**
394
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181 * Access to revision data as is, equivalent to <code>rawContent(getRevisionIndex(nodeid), sink)</code>
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182 *
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183 * @param nodeid revision to retrieve
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184 * @param sink data destination
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185 *
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186 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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187 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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188 * @throws CancelledException if content retrieval operation was cancelled
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189 *
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190 * @see #rawContent(int, ByteChannel)
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191 */
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192 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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193 rawContent(getRevisionIndex(nodeid), sink);
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194 }
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195
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196 /**
394
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197 * Access to revision data as is (decompressed, but otherwise unprocessed, i.e. not parsed for e.g. changeset or manifest entries).
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198 *
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199 * @param revisionIndex index of this revlog change (not a changelog revision index), non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense.
394
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200 * @param sink data destination
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201 *
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202 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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203 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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204 * @throws CancelledException if content retrieval operation was cancelled
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205 */
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206 protected void rawContent(int revisionIndex, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
157
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207 if (sink == null) {
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208 throw new IllegalArgumentException();
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209 }
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210 try {
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211 ContentPipe insp = new ContentPipe(sink, 0, repo.getContext().getLog());
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212 insp.checkCancelled();
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213 content.iterate(revisionIndex, revisionIndex, true, insp);
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214 insp.checkFailed();
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215 } catch (IOException ex) {
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216 HgInvalidControlFileException e = new HgInvalidControlFileException(String.format("Access to revision %d content failed", revisionIndex), ex, null);
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217 e.setRevisionIndex(revisionIndex);
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218 // FIXME e.setFileName(content.getIndexFile() or this.getHumanFriendlyPath()) - shall decide whether
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219 // protected abstract getPath() with impl in HgDataFile, HgManifest and HgChangelog or path is data of either Revlog or RevlogStream
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220 // Do the same (add file name) below
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221 throw e;
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222 } catch (HgInvalidControlFileException ex) {
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223 throw ex;
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224 } catch (HgException ex) {
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225 HgInvalidControlFileException e = new HgInvalidControlFileException(ex.getClass().getSimpleName(), ex, null);
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226 e.setRevisionIndex(revisionIndex);
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227 throw e;
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228 }
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229 }
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230
56
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231 /**
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232 * Fills supplied arguments with information about revision parents.
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233 *
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234 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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235 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1}), {@link HgRepository#NO_REVISION} indicates parent not set
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236 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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237 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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238 * @throws HgInvalidRevisionException
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239 * @throws HgInvalidControlFileException FIXME
347
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240 * @throws IllegalArgumentException
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241 */
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242 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) throws HgInvalidRevisionException, HgInvalidControlFileException {
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243 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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244 throw new HgInvalidRevisionException(revision);
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245 }
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246 if (parentRevisions == null || parentRevisions.length < 2) {
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247 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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248 }
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249 if (parent1 != null && parent1.length < 20) {
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250 throw new IllegalArgumentException(parent1.toString());
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251 }
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252 if (parent2 != null && parent2.length < 20) {
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253 throw new IllegalArgumentException(parent2.toString());
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254 }
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255 class ParentCollector implements RevlogStream.Inspector {
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256 public int p1 = -1;
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257 public int p2 = -1;
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258 public byte[] nodeid;
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259
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260 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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261 p1 = parent1Revision;
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262 p2 = parent2Revision;
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263 this.nodeid = new byte[20];
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264 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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265 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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266 }
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267 };
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268 ParentCollector pc = new ParentCollector();
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269 content.iterate(revision, revision, false, pc);
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270 // although next code looks odd (NO_REVISION *is* -1), it's safer to be explicit
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271 parentRevisions[0] = pc.p1 == -1 ? NO_REVISION : pc.p1;
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272 parentRevisions[1] = pc.p2 == -1 ? NO_REVISION : pc.p2;
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273 if (parent1 != null) {
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274 if (parentRevisions[0] == NO_REVISION) {
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275 Arrays.fill(parent1, 0, 20, (byte) 0);
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276 } else {
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277 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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278 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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279 }
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280 }
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281 if (parent2 != null) {
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282 if (parentRevisions[1] == NO_REVISION) {
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283 Arrays.fill(parent2, 0, 20, (byte) 0);
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284 } else {
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285 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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286 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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287 }
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288 }
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289 }
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290
324
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291 @Experimental
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292 public void walk(int start, int end, final Revlog.Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
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293 int lastRev = getLastRevision();
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294 if (start == TIP) {
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295 start = lastRev;
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296 }
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297 if (end == TIP) {
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298 end = lastRev;
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299 }
356
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300 final RevisionInspector revisionInsp = Adaptable.Factory.getAdapter(inspector, RevisionInspector.class, null);
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301 final ParentInspector parentInsp = Adaptable.Factory.getAdapter(inspector, ParentInspector.class, null);
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302 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - start + 1];
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303
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304 content.iterate(start, end, false, new RevlogStream.Inspector() {
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305
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306 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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307 Nodeid nid = Nodeid.fromBinary(nodeid, 0);
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308 if (revisionInsp != null) {
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309 revisionInsp.next(revisionNumber, nid, linkRevision);
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310 }
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311 if (parentInsp != null) {
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312 Nodeid p1 = parent1Revision == -1 ? Nodeid.NULL : allRevisions[parent1Revision];
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313 Nodeid p2 = parent2Revision == -1 ? Nodeid.NULL : allRevisions[parent2Revision];
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314 allRevisions[revisionNumber] = nid;
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315 parentInsp.next(revisionNumber, nid, parent1Revision, parent2Revision, p1, p2);
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316 }
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317 }
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318 });
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319 }
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320
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321 /**
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322 * MARKER
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323 */
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324 @Experimental
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325 public interface Inspector {
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326 }
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327
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328 @Experimental
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329 public interface RevisionInspector extends Inspector {
368
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330 void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex);
324
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331 }
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332
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333 @Experimental
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334 public interface ParentInspector extends Inspector {
327
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335 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?)
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336 void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2);
324
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337 }
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338
29
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339 /*
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340 * XXX think over if it's better to do either:
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341 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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342 * or
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343 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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344 *
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345 * and yes, walker is not a proper name
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346 */
324
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347 public final class ParentWalker implements ParentInspector {
200
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348
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349
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350 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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351 private Nodeid[] sorted; // for binary search
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352 private int[] sorted2natural;
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353 private Nodeid[] firstParent;
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354 private Nodeid[] secondParent;
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355
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356 // Nodeid instances shall be shared between all arrays
29
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357
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358 public ParentWalker() {
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359 }
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360
192
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361 public HgRepository getRepo() {
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362 return Revlog.this.getRepo();
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363 }
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364
324
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365 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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366 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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367 throw new IllegalStateException(); // sanity, revisions are sequential
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368 }
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369 int ix = revisionNumber;
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370 sequential[ix] = sorted[ix] = revision;
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371 if (parent1Revision != -1) {
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372 firstParent[ix] = sequential[parent1Revision];
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373 }
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374 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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375 secondParent[ix] = sequential[parent2Revision];
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376 }
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377 }
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378
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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379 public void init() throws HgInvalidControlFileException {
324
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380 final int revisionCount = Revlog.this.getRevisionCount();
200
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381 firstParent = new Nodeid[revisionCount];
393
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382 // TODO [post 1.0] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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383 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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384 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant)
200
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385 secondParent = new Nodeid[revisionCount];
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386 //
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387 sequential = new Nodeid[revisionCount];
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388 sorted = new Nodeid[revisionCount];
324
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389 Revlog.this.walk(0, TIP, this);
200
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390 Arrays.sort(sorted);
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391 sorted2natural = new int[revisionCount];
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392 for (int i = 0; i < revisionCount; i++) {
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393 Nodeid n = sequential[i];
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394 int x = Arrays.binarySearch(sorted, n);
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395 assertSortedIndex(x);
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396 sorted2natural[x] = i;
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397 }
29
6cce719bbb62 Collector for nodes and their parents
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398 }
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399
200
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400 private void assertSortedIndex(int x) {
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401 if (x < 0) {
403
2747b0723867 FIXMEs: work on exceptions and javadoc
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402 throw new HgBadStateException(String.format("Bad index", x));
200
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403 }
29
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404 }
31
346b66add79d Basic lookup for incoming changes
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diff changeset
405
393
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406 /**
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407 * Tells whether supplied revision is from the walker's associated revlog.
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diff changeset
408 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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409 * @param nid revision to check, not <code>null</code>
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410 * @return <code>true</code> if revision matches any revision in this revlog
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411 */
31
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diff changeset
412 public boolean knownNode(Nodeid nid) {
200
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413 return Arrays.binarySearch(sorted, nid) >= 0;
31
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diff changeset
414 }
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
415
200
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416 /**
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417 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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418 */
29
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419 public Nodeid firstParent(Nodeid nid) {
200
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420 int x = Arrays.binarySearch(sorted, nid);
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421 assertSortedIndex(x);
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422 int i = sorted2natural[x];
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423 return firstParent[i];
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
424 }
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
425
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
426 // never null, Nodeid.NULL if none known
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diff changeset
427 public Nodeid safeFirstParent(Nodeid nid) {
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diff changeset
428 Nodeid rv = firstParent(nid);
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diff changeset
429 return rv == null ? Nodeid.NULL : rv;
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diff changeset
430 }
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
431
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diff changeset
432 public Nodeid secondParent(Nodeid nid) {
200
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433 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
434 assertSortedIndex(x);
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diff changeset
435 int i = sorted2natural[x];
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diff changeset
436 return secondParent[i];
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
437 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
438
49
26e3eeaa3962 branch and user filtering for log operation
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parents: 39
diff changeset
439 public Nodeid safeSecondParent(Nodeid nid) {
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
440 Nodeid rv = secondParent(nid);
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
441 return rv == null ? Nodeid.NULL : rv;
26e3eeaa3962 branch and user filtering for log operation
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 39
diff changeset
442 }
26e3eeaa3962 branch and user filtering for log operation
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parents: 39
diff changeset
443
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
444 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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diff changeset
445 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
446 assertSortedIndex(x);
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diff changeset
447 int i = sorted2natural[x];
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diff changeset
448 Nodeid p1 = firstParent[i];
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
449 boolean modified = false;
6cce719bbb62 Collector for nodes and their parents
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diff changeset
450 if (p1 != null) {
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diff changeset
451 modified = c.add(p1);
191
b777502a06f5 Do not assume second parent can be set only when first one is set, again
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diff changeset
452 }
200
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diff changeset
453 Nodeid p2 = secondParent[i];
191
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diff changeset
454 if (p2 != null) {
b777502a06f5 Do not assume second parent can be set only when first one is set, again
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diff changeset
455 modified = c.add(p2) || modified;
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
456 }
6cce719bbb62 Collector for nodes and their parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
457 return modified;
6cce719bbb62 Collector for nodes and their parents
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diff changeset
458 }
171
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
459
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
460 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
461 // nodes, their parents and so on.
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diff changeset
462
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
463 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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diff changeset
464 // Nodeids shall belong to this revlog
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diff changeset
465 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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diff changeset
466 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
467 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
468 int earliestRevision = Integer.MAX_VALUE;
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diff changeset
469 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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diff changeset
470 // first, find earliest index of roots in question, as there's no sense
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diff changeset
471 // to check children among nodes prior to branch's root node
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diff changeset
472 for (Nodeid r : roots) {
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
473 int x = Arrays.binarySearch(sorted, r);
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
474 assertSortedIndex(x);
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
475 int i = sorted2natural[x];
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 197
diff changeset
476 if (i < earliestRevision) {
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
477 earliestRevision = i;
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
478 }
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diff changeset
479 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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diff changeset
480 }
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diff changeset
481 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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diff changeset
482 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
483 parents.add(sequential[i]); // to find next child
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diff changeset
484 result.add(sequential[i]);
171
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parents: 157
diff changeset
485 }
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486 }
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487 return result;
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488 }
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489
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490 /**
308
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491 * @return revisions that have supplied revision as their immediate parent
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492 */
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493 public List<Nodeid> directChildren(Nodeid nid) {
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494 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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495 int x = Arrays.binarySearch(sorted, nid);
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496 assertSortedIndex(x);
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497 nid = sorted[x]; // canonical instance
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498 int start = sorted2natural[x];
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499 for (int i = start + 1; i < sequential.length; i++) {
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500 if (nid == firstParent[i] || nid == secondParent[i]) {
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501 result.add(sequential[i]);
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502 }
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503 }
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504 return result;
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505 }
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506
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507 /**
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508 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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509 * @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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510 */
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511 public boolean hasChildren(Nodeid nid) {
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512 int x = Arrays.binarySearch(sorted, nid);
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513 assertSortedIndex(x);
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514 int i = sorted2natural[x];
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515 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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516 assert firstParent.length == sequential.length;
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517 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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518 final Nodeid canonicalNode = sequential[i];
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519 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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520 for (; i < sequential.length; i++) {
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521 // TODO [post 1.0] likely, not very effective.
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522 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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523 // however, need to be careful with memory usage
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524 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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525 return true;
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526 }
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527 }
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528 return false;
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529 }
29
6cce719bbb62 Collector for nodes and their parents
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530 }
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531
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532 /**
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533 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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534 * multiple {@link Revlog#getRevisionIndex(Nodeid)} calls.
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535 *
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536 * {@link Revlog#getRevisionIndex(Nodeid)} with straightforward lookup approach performs O(n/2)
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537 * {@link RevisionMap#revisionIndex(Nodeid)} is log(n), plus initialization is O(n) (just once).
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538 */
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539 public final class RevisionMap implements RevisionInspector {
243
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540 /*
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541 * in fact, initialization is much slower as it instantiates Nodeids, while #getRevisionIndex
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542 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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543 * for complete changelog iteration.
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544 */
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545
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546 /*
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547 * XXX 3 * (x * 4) bytes. Can I do better?
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diff changeset
548 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural.
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diff changeset
549 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind)
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550 */
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551 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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552 private Nodeid[] sorted; // for binary search
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553 private int[] sorted2natural;
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554
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555 public RevisionMap() {
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556 }
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557
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558 public HgRepository getRepo() {
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diff changeset
559 return Revlog.this.getRepo();
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560 }
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561
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diff changeset
562 public void next(int revisionIndex, Nodeid revision, int linkedRevision) {
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diff changeset
563 sequential[revisionIndex] = sorted[revisionIndex] = revision;
324
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diff changeset
564 }
243
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565
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diff changeset
566 /**
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diff changeset
567 * @return <code>this</code> for convenience.
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diff changeset
568 */
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diff changeset
569 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) throws HgInvalidControlFileException{
243
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570 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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571 final int revisionCount = Revlog.this.getRevisionCount();
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572 sequential = new Nodeid[revisionCount];
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573 sorted = new Nodeid[revisionCount];
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574 Revlog.this.walk(0, TIP, this);
307
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diff changeset
575 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted.
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576 // the way sorted2natural was build is O(n*log n).
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577 final ArrayHelper ah = new ArrayHelper();
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578 ah.sort(sorted);
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diff changeset
579 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based
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diff changeset
580 sorted2natural = ah.getReverse();
243
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diff changeset
581 return this;
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582 }
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583
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diff changeset
584 public Nodeid revision(int revisionIndex) {
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585 return sequential[revisionIndex];
243
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586 }
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diff changeset
587 public int revisionIndex(Nodeid revision) {
274
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diff changeset
588 if (revision == null || revision.isNull()) {
243
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589 return BAD_REVISION;
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590 }
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591 int x = Arrays.binarySearch(sorted, revision);
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diff changeset
592 if (x < 0) {
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diff changeset
593 return BAD_REVISION;
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diff changeset
594 }
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diff changeset
595 return sorted2natural[x]-1;
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596 }
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diff changeset
597 /**
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diff changeset
598 * @deprecated use {@link #revisionIndex(Nodeid)} instead
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diff changeset
599 */
2fadf8695f8a Use 'revision index' instead of the vague 'local revision number' concept in the API
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diff changeset
600 @Deprecated
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diff changeset
601 public int localRevision(Nodeid revision) {
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diff changeset
602 return revisionIndex(revision);
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diff changeset
603 }
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604 }
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605
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diff changeset
606 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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diff changeset
607 private Exception failure;
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608 private CancelSupport cancelSupport;
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609
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610 protected void setCancelSupport(CancelSupport cs) {
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611 assert cancelSupport == null; // no reason to set it twice
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612 cancelSupport = cs;
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613 }
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614
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615 protected void recordFailure(Exception ex) {
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616 assert failure == null;
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617 failure = ex;
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618 }
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619
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620 // TODO consider if IOException in addition to HgException is of any real utility
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621 public void checkFailed() throws HgException, IOException, CancelledException {
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622 if (failure == null) {
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623 return;
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624 }
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625 if (failure instanceof IOException) {
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626 throw (IOException) failure;
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627 }
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628 if (failure instanceof CancelledException) {
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629 throw (CancelledException) failure;
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630 }
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631 if (failure instanceof HgException) {
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632 throw (HgException) failure;
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633 }
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634 throw new HgBadStateException(failure);
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635 }
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636
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637 public void checkCancelled() throws CancelledException {
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638 if (cancelSupport != null) {
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639 cancelSupport.checkCancelled();
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640 }
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641 }
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642 }
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643
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644 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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645 private final ByteChannel sink;
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646 private final int offset;
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647 private final LogFacility logFacility;
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648
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649 /**
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650 * @param _sink - cannot be <code>null</code>
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651 * @param seekOffset - when positive, orders to pipe bytes to the sink starting from specified offset, not from the first byte available in DataAccess
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652 * @param log optional facility to put warnings/debug messages into, may be null.
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653 */
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654 public ContentPipe(ByteChannel _sink, int seekOffset, LogFacility log) {
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655 assert _sink != null;
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656 sink = _sink;
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657 setCancelSupport(CancelSupport.Factory.get(_sink));
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658 offset = seekOffset;
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659 logFacility = log;
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660 }
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661
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662 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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663 if (offset > 0) { // save few useless reset/rewind operations
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664 da.seek(offset);
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665 }
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666 }
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667
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668 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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669 try {
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670 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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671 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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672 ByteBuffer buf = ByteBuffer.allocate(actualLen > 8192 ? 8192 : actualLen);
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673 Preview p = Adaptable.Factory.getAdapter(sink, Preview.class, null);
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674 if (p != null) {
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675 progressSupport.start(2 * da.length());
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676 while (!da.isEmpty()) {
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677 checkCancelled();
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678 da.readBytes(buf);
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679 p.preview(buf);
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680 buf.clear();
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681 }
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682 da.reset();
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683 prepare(revisionNumber, da);
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684 progressSupport.worked(da.length());
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685 buf.clear();
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686 } else {
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687 progressSupport.start(da.length());
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688 }
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689 while (!da.isEmpty()) {
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690 checkCancelled();
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691 da.readBytes(buf);
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692 buf.flip(); // post: position == 0
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693 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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694
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695 int consumed = sink.write(buf);
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696 if ((consumed == 0 || consumed != buf.position()) && logFacility != null) {
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697 logFacility.warn(getClass(), "Bad data sink when reading revision %d. Reported %d bytes consumed, byt actually read %d", revisionNumber, consumed, buf.position());
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698 }
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699 if (buf.position() == 0) {
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700 throw new HgBadStateException("Bad sink implementation (consumes no bytes) results in endless loop");
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701 }
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702 buf.compact(); // ensure (a) there's space for new (b) data starts at 0
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703 progressSupport.worked(consumed);
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704 }
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705 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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706 } catch (IOException ex) {
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707 recordFailure(ex);
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708 } catch (CancelledException ex) {
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709 recordFailure(ex);
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710 } catch (HgException ex) {
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711 recordFailure(ex);
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712 }
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713 }
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714 }
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715 }