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annotate src/org/tmatesoft/hg/repo/Revlog.java @ 388:b015f3918120

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Work on FIXME: correct HgDataFile#workingCopy with tests; BasicSessionContext with property override; platform-specific options to internals
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 Feb 2012 22:57:56 +0100
parents 6150555eb41d
children 728708de3597
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.TIP;
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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24 import java.util.ArrayList;
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25 import java.util.Arrays;
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26 import java.util.Collection;
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27 import java.util.HashSet;
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28 import java.util.LinkedList;
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29 import java.util.List;
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31 import org.tmatesoft.hg.core.HgBadStateException;
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32 import org.tmatesoft.hg.core.HgException;
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33 import org.tmatesoft.hg.core.HgInvalidControlFileException;
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34 import org.tmatesoft.hg.core.HgInvalidRevisionException;
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35 import org.tmatesoft.hg.core.Nodeid;
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36 import org.tmatesoft.hg.internal.ArrayHelper;
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37 import org.tmatesoft.hg.internal.DataAccess;
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38 import org.tmatesoft.hg.internal.Experimental;
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39 import org.tmatesoft.hg.internal.Preview;
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40 import org.tmatesoft.hg.internal.RevlogStream;
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41 import org.tmatesoft.hg.util.Adaptable;
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42 import org.tmatesoft.hg.util.ByteChannel;
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43 import org.tmatesoft.hg.util.CancelSupport;
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44 import org.tmatesoft.hg.util.CancelledException;
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45 import org.tmatesoft.hg.util.LogFacility;
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46 import org.tmatesoft.hg.util.ProgressSupport;
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48
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49 /**
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50 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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51 *
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52 * Implementation note:
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53 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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54 * in public methods.
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55 *
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56 * @author Artem Tikhomirov
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57 * @author TMate Software Ltd.
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58 */
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59 abstract class Revlog {
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61 private final HgRepository repo;
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62 protected final RevlogStream content;
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64 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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65 if (hgRepo == null) {
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66 throw new IllegalArgumentException();
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67 }
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68 if (contentStream == null) {
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69 throw new IllegalArgumentException();
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70 }
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71 repo = hgRepo;
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72 content = contentStream;
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73 }
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75 // invalid Revlog
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76 protected Revlog(HgRepository hgRepo) {
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77 repo = hgRepo;
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78 content = null;
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79 }
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81 public final HgRepository getRepo() {
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82 return repo;
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83 }
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84
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85 public final int getRevisionCount() {
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86 return content.revisionCount();
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87 }
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89 public final int getLastRevision() {
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90 return content.revisionCount() - 1;
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91 }
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93 /**
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94 * Map revision index to unique revision identifier (nodeid).
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95 *
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96 * @param revision index of the entry in this revlog, may be {@link HgRepository#TIP}
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97 * @return revision nodeid of the entry
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98 *
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99 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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100 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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101 */
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102 public final Nodeid getRevision(int revision) throws HgInvalidRevisionException, HgInvalidControlFileException {
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103 // XXX cache nodeids? Rather, if context.getCache(this).getRevisionMap(create == false) != null, use it
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104 return Nodeid.fromBinary(content.nodeid(revision), 0);
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105 }
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106
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107 /**
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108 * 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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109 */
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110 public final List<Nodeid> getRevisions(int... revisions) throws HgInvalidRevisionException, HgInvalidControlFileException {
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111 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length);
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112 Arrays.sort(revisions);
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113 getRevisionsInternal(rv, revisions);
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114 return rv;
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115 }
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117 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) throws HgInvalidRevisionException, HgInvalidControlFileException {
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118 // once I have getRevisionMap and may find out whether it is avalable from cache,
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119 // may use it, perhaps only for small number of revisions
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120 content.iterate(sortedRevs, false, new RevlogStream.Inspector() {
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121
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122 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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123 retVal.add(Nodeid.fromBinary(nodeid, 0));
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124 }
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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 * Get local index of the specified revision.
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130 * If unsure, use {@link #isKnown(Nodeid)} to find out whether nodeid belongs to this revlog.
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131 *
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132 * For occasional queries, this method works with decent performance, despite its O(n/2) approach.
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133 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link RevisionMap} may come handy.
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134 *
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135 * @param nid revision to look up
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136 * @return revision local index in this revlog
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137 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog
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138 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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139 */
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140 public final int getRevisionIndex(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
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141 int revision = content.findRevisionIndex(nid);
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142 if (revision == BAD_REVISION) {
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143 throw new HgInvalidRevisionException(String.format("Can't find revision %s in %s", nid.shortNotation(), this /*FIXME HgDataFile.getPath might be more suitable here*/), nid, null);
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144 }
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145 return revision;
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146 }
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147
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148 /**
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149 * @deprecated use {@link #getRevisionIndex(Nodeid)} instead
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150 */
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151 @Deprecated
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152 public final int getLocalRevision(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
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153 return getRevisionIndex(nid);
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154 }
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155
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156
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157 /**
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158 * Note, {@link Nodeid#NULL} nodeid is not reported as known in any revlog.
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159 *
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160 * @param nodeid
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161 * @return
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162 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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163 */
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164 public final boolean isKnown(Nodeid nodeid) throws HgInvalidControlFileException {
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165 final int rn = content.findRevisionIndex(nodeid);
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166 if (BAD_REVISION == rn) {
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167 return false;
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168 }
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169 if (rn < 0 || rn >= content.revisionCount()) {
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170 // Sanity check
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171 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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172 }
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173 return true;
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174 }
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175
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176 /**
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177 * 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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178 * @param nodeid
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179 */
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180 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException, HgInvalidRevisionException {
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181 rawContent(getRevisionIndex(nodeid), sink);
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182 }
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183
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184 /**
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185 * @param fileRevisionIndex - index of this file change (not a changelog revision index), non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense.
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186 * FIXME is it necessary to have IOException along with HgException here?
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187 */
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188 protected void rawContent(int fileRevisionIndex, ByteChannel sink) throws HgException, IOException, CancelledException, HgInvalidRevisionException {
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189 if (sink == null) {
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190 throw new IllegalArgumentException();
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191 }
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192 ContentPipe insp = new ContentPipe(sink, 0, repo.getContext().getLog());
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193 insp.checkCancelled();
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194 content.iterate(fileRevisionIndex, fileRevisionIndex, true, insp);
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195 insp.checkFailed();
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196 }
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197
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198 /**
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199 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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200 *
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201 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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202 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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203 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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204 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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205 * @throws HgInvalidRevisionException
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206 * @throws IllegalArgumentException
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207 */
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208 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) throws HgInvalidRevisionException, HgInvalidControlFileException {
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209 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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210 throw new HgInvalidRevisionException(revision);
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211 }
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212 if (parentRevisions == null || parentRevisions.length < 2) {
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213 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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214 }
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215 if (parent1 != null && parent1.length < 20) {
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216 throw new IllegalArgumentException(parent1.toString());
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217 }
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218 if (parent2 != null && parent2.length < 20) {
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219 throw new IllegalArgumentException(parent2.toString());
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220 }
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221 class ParentCollector implements RevlogStream.Inspector {
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222 public int p1 = -1;
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223 public int p2 = -1;
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224 public byte[] nodeid;
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225
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226 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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227 p1 = parent1Revision;
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228 p2 = parent2Revision;
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229 this.nodeid = new byte[20];
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230 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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231 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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232 }
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233 };
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234 ParentCollector pc = new ParentCollector();
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235 content.iterate(revision, revision, false, pc);
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236 parentRevisions[0] = pc.p1;
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237 parentRevisions[1] = pc.p2;
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238 if (parent1 != null) {
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239 if (parentRevisions[0] == -1) {
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240 Arrays.fill(parent1, 0, 20, (byte) 0);
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241 } else {
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242 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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243 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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244 }
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245 }
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246 if (parent2 != null) {
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247 if (parentRevisions[1] == -1) {
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248 Arrays.fill(parent2, 0, 20, (byte) 0);
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249 } else {
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250 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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251 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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252 }
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253 }
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254 }
317
09628675bcee Rework file history build approach to match rest of the API
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255
324
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256 @Experimental
366
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257 public void walk(int start, int end, final Revlog.Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
324
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258 int lastRev = getLastRevision();
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259 if (start == TIP) {
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260 start = lastRev;
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261 }
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262 if (end == TIP) {
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263 end = lastRev;
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264 }
356
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265 final RevisionInspector revisionInsp = Adaptable.Factory.getAdapter(inspector, RevisionInspector.class, null);
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266 final ParentInspector parentInsp = Adaptable.Factory.getAdapter(inspector, ParentInspector.class, null);
324
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267 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - start + 1];
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268
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269 content.iterate(start, end, false, new RevlogStream.Inspector() {
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270
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271 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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272 Nodeid nid = Nodeid.fromBinary(nodeid, 0);
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273 if (revisionInsp != null) {
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274 revisionInsp.next(revisionNumber, nid, linkRevision);
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275 }
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276 if (parentInsp != null) {
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277 Nodeid p1 = parent1Revision == -1 ? Nodeid.NULL : allRevisions[parent1Revision];
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278 Nodeid p2 = parent2Revision == -1 ? Nodeid.NULL : allRevisions[parent2Revision];
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279 allRevisions[revisionNumber] = nid;
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280 parentInsp.next(revisionNumber, nid, parent1Revision, parent2Revision, p1, p2);
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281 }
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282 }
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283 });
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284 }
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285
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286 /**
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287 * MARKER
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288 */
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289 @Experimental
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290 public interface Inspector {
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291 }
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292
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293 @Experimental
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294 public interface RevisionInspector extends Inspector {
368
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295 void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex);
324
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296 }
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297
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298 @Experimental
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299 public interface ParentInspector extends Inspector {
327
3f09b8c19142 Tests for Revlog.Inspectors
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300 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?)
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301 void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2);
324
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302 }
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303
29
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304 /*
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305 * XXX think over if it's better to do either:
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306 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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307 * or
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308 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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309 *
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310 * and yes, walker is not a proper name
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311 */
324
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312 public final class ParentWalker implements ParentInspector {
200
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313
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314
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315 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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316 private Nodeid[] sorted; // for binary search
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317 private int[] sorted2natural;
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318 private Nodeid[] firstParent;
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319 private Nodeid[] secondParent;
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320
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321 // Nodeid instances shall be shared between all arrays
29
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322
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323 public ParentWalker() {
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324 }
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325
192
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326 public HgRepository getRepo() {
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327 return Revlog.this.getRepo();
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328 }
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329
324
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330 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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331 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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332 throw new IllegalStateException(); // sanity, revisions are sequential
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333 }
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334 int ix = revisionNumber;
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335 sequential[ix] = sorted[ix] = revision;
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336 if (parent1Revision != -1) {
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337 firstParent[ix] = sequential[parent1Revision];
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338 }
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339 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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340 secondParent[ix] = sequential[parent2Revision];
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341 }
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342 }
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343
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344 public void init() throws HgInvalidControlFileException {
324
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345 final int revisionCount = Revlog.this.getRevisionCount();
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346 firstParent = new Nodeid[revisionCount];
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347 // although branches/merges are less frequent, and most of secondParent would be -1/null, some sort of
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348 // SparseOrderedList might be handy, provided its inner structures do not overweight simplicity of an array
324
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349 // FIXME IntMap is right candidate?
200
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350 secondParent = new Nodeid[revisionCount];
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351 //
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352 sequential = new Nodeid[revisionCount];
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353 sorted = new Nodeid[revisionCount];
324
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354 Revlog.this.walk(0, TIP, this);
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355 Arrays.sort(sorted);
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356 sorted2natural = new int[revisionCount];
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357 for (int i = 0; i < revisionCount; i++) {
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358 Nodeid n = sequential[i];
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359 int x = Arrays.binarySearch(sorted, n);
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360 assertSortedIndex(x);
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361 sorted2natural[x] = i;
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362 }
29
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363 }
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364
200
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365 private void assertSortedIndex(int x) {
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366 if (x < 0) {
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367 throw new HgBadStateException();
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368 }
29
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369 }
31
346b66add79d Basic lookup for incoming changes
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370
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371 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
200
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372 // right now Nodeid.NULL is not recognized as known if passed to this method,
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373 // caller is supposed to make explicit check
31
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374 public boolean knownNode(Nodeid nid) {
200
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375 return Arrays.binarySearch(sorted, nid) >= 0;
31
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376 }
29
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377
200
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378 /**
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379 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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380 */
29
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381 public Nodeid firstParent(Nodeid nid) {
200
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382 int x = Arrays.binarySearch(sorted, nid);
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383 assertSortedIndex(x);
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384 int i = sorted2natural[x];
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385 return firstParent[i];
29
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386 }
49
26e3eeaa3962 branch and user filtering for log operation
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387
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388 // never null, Nodeid.NULL if none known
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389 public Nodeid safeFirstParent(Nodeid nid) {
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390 Nodeid rv = firstParent(nid);
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391 return rv == null ? Nodeid.NULL : rv;
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392 }
29
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393
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394 public Nodeid secondParent(Nodeid nid) {
200
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395 int x = Arrays.binarySearch(sorted, nid);
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396 assertSortedIndex(x);
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397 int i = sorted2natural[x];
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398 return secondParent[i];
29
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399 }
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400
49
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401 public Nodeid safeSecondParent(Nodeid nid) {
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402 Nodeid rv = secondParent(nid);
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403 return rv == null ? Nodeid.NULL : rv;
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404 }
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diff changeset
405
29
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406 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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407 int x = Arrays.binarySearch(sorted, nid);
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408 assertSortedIndex(x);
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409 int i = sorted2natural[x];
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410 Nodeid p1 = firstParent[i];
29
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diff changeset
411 boolean modified = false;
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412 if (p1 != null) {
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413 modified = c.add(p1);
191
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414 }
200
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415 Nodeid p2 = secondParent[i];
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416 if (p2 != null) {
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417 modified = c.add(p2) || modified;
29
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diff changeset
418 }
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419 return modified;
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420 }
171
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421
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422 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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423 // nodes, their parents and so on.
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424
200
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425 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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426 // Nodeids shall belong to this revlog
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427 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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428 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
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429 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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430 int earliestRevision = Integer.MAX_VALUE;
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431 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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432 // first, find earliest index of roots in question, as there's no sense
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433 // to check children among nodes prior to branch's root node
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434 for (Nodeid r : roots) {
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435 int x = Arrays.binarySearch(sorted, r);
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436 assertSortedIndex(x);
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437 int i = sorted2natural[x];
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438 if (i < earliestRevision) {
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diff changeset
439 earliestRevision = i;
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440 }
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441 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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442 }
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443 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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diff changeset
444 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
445 parents.add(sequential[i]); // to find next child
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diff changeset
446 result.add(sequential[i]);
171
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diff changeset
447 }
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diff changeset
448 }
200
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449 return result;
171
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diff changeset
450 }
192
e5407b5a586a Incoming and Outgoing commands are alive
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diff changeset
451
e5407b5a586a Incoming and Outgoing commands are alive
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diff changeset
452 /**
308
3f40262153a4 Recognize closed branches
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453 * @return revisions that have supplied revision as their immediate parent
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diff changeset
454 */
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diff changeset
455 public List<Nodeid> directChildren(Nodeid nid) {
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diff changeset
456 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
457 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
458 assertSortedIndex(x);
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diff changeset
459 nid = sorted[x]; // canonical instance
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diff changeset
460 int start = sorted2natural[x];
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diff changeset
461 for (int i = start + 1; i < sequential.length; i++) {
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diff changeset
462 if (nid == firstParent[i] || nid == secondParent[i]) {
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parents: 307
diff changeset
463 result.add(sequential[i]);
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diff changeset
464 }
3f40262153a4 Recognize closed branches
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diff changeset
465 }
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diff changeset
466 return result;
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diff changeset
467 }
3f40262153a4 Recognize closed branches
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diff changeset
468
3f40262153a4 Recognize closed branches
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diff changeset
469 /**
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
470 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
192
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diff changeset
471 * @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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diff changeset
472 */
200
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diff changeset
473 public boolean hasChildren(Nodeid nid) {
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diff changeset
474 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
475 assertSortedIndex(x);
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diff changeset
476 int i = sorted2natural[x];
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diff changeset
477 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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diff changeset
478 assert firstParent.length == sequential.length;
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diff changeset
479 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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diff changeset
480 final Nodeid canonicalNode = sequential[i];
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diff changeset
481 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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diff changeset
482 for (; i < sequential.length; i++) {
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diff changeset
483 // FIXME likely, not very effective.
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diff changeset
484 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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diff changeset
485 // however, need to be careful with memory usage
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diff changeset
486 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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487 return true;
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488 }
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489 }
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490 return false;
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491 }
29
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492 }
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493
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494 /**
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495 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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496 * multiple {@link Revlog#getRevisionIndex(Nodeid)} calls.
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497 *
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498 * {@link Revlog#getRevisionIndex(Nodeid)} with straightforward lookup approach performs O(n/2)
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499 * {@link RevisionMap#revisionIndex(Nodeid)} is log(n), plus initialization is O(n) (just once).
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500 */
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501 public final class RevisionMap implements RevisionInspector {
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502 /*
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503 * in fact, initialization is much slower as it instantiates Nodeids, while #getRevisionIndex
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504 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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505 * for complete changelog iteration.
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506 */
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507
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508 /*
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509 * XXX 3 * (x * 4) bytes. Can I do better?
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510 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural.
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511 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind)
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512 */
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513 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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514 private Nodeid[] sorted; // for binary search
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515 private int[] sorted2natural;
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516
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517 public RevisionMap() {
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518 }
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519
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520 public HgRepository getRepo() {
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521 return Revlog.this.getRepo();
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522 }
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523
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524 public void next(int revisionIndex, Nodeid revision, int linkedRevision) {
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525 sequential[revisionIndex] = sorted[revisionIndex] = revision;
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526 }
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527
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528 /**
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529 * @return <code>this</code> for convenience.
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530 */
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531 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) throws HgInvalidControlFileException{
243
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532 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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533 final int revisionCount = Revlog.this.getRevisionCount();
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534 sequential = new Nodeid[revisionCount];
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535 sorted = new Nodeid[revisionCount];
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536 Revlog.this.walk(0, TIP, this);
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537 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted.
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538 // the way sorted2natural was build is O(n*log n).
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539 final ArrayHelper ah = new ArrayHelper();
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540 ah.sort(sorted);
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541 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based
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542 sorted2natural = ah.getReverse();
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543 return this;
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544 }
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545
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546 public Nodeid revision(int revisionIndex) {
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547 return sequential[revisionIndex];
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548 }
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549 public int revisionIndex(Nodeid revision) {
274
9fb50c04f03c Use Nodeid.isNull check instead of NULL.equals
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550 if (revision == null || revision.isNull()) {
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551 return BAD_REVISION;
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552 }
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553 int x = Arrays.binarySearch(sorted, revision);
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554 if (x < 0) {
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555 return BAD_REVISION;
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556 }
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557 return sorted2natural[x]-1;
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558 }
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559 /**
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560 * @deprecated use {@link #revisionIndex(Nodeid)} instead
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561 */
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diff changeset
562 @Deprecated
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diff changeset
563 public int localRevision(Nodeid revision) {
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564 return revisionIndex(revision);
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565 }
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566 }
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567
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568 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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569 private Exception failure;
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570 private CancelSupport cancelSupport;
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571
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572 protected void setCancelSupport(CancelSupport cs) {
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573 assert cancelSupport == null; // no reason to set it twice
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574 cancelSupport = cs;
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575 }
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576
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577 protected void recordFailure(Exception ex) {
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578 assert failure == null;
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579 failure = ex;
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580 }
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581
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582 public void checkFailed() throws HgException, IOException, CancelledException {
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583 if (failure == null) {
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584 return;
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585 }
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586 if (failure instanceof IOException) {
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587 throw (IOException) failure;
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588 }
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589 if (failure instanceof CancelledException) {
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590 throw (CancelledException) failure;
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591 }
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592 if (failure instanceof HgException) {
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593 throw (HgException) failure;
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594 }
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595 throw new HgBadStateException(failure);
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596 }
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597
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598 public void checkCancelled() throws CancelledException {
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599 if (cancelSupport != null) {
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600 cancelSupport.checkCancelled();
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601 }
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602 }
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603 }
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604
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605 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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606 private final ByteChannel sink;
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607 private final int offset;
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608 private final LogFacility logFacility;
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609
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610 /**
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611 * @param _sink - cannot be <code>null</code>
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612 * @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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613 * @param log optional facility to put warnings/debug messages into, may be null.
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614 */
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615 public ContentPipe(ByteChannel _sink, int seekOffset, LogFacility log) {
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616 assert _sink != null;
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617 sink = _sink;
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618 setCancelSupport(CancelSupport.Factory.get(_sink));
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619 offset = seekOffset;
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620 logFacility = log;
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621 }
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622
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623 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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624 if (offset > 0) { // save few useless reset/rewind operations
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625 da.seek(offset);
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626 }
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627 }
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628
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629 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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630 try {
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631 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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632 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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633 ByteBuffer buf = ByteBuffer.allocate(actualLen > 8192 ? 8192 : actualLen);
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634 Preview p = Adaptable.Factory.getAdapter(sink, Preview.class, null);
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635 if (p != null) {
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636 progressSupport.start(2 * da.length());
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637 while (!da.isEmpty()) {
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638 checkCancelled();
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639 da.readBytes(buf);
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640 p.preview(buf);
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641 buf.clear();
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642 }
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643 da.reset();
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644 prepare(revisionNumber, da);
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645 progressSupport.worked(da.length());
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646 buf.clear();
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647 } else {
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648 progressSupport.start(da.length());
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649 }
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650 while (!da.isEmpty()) {
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651 checkCancelled();
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652 da.readBytes(buf);
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653 buf.flip(); // post: position == 0
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654 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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655
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656 int consumed = sink.write(buf);
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657 if ((consumed == 0 || consumed != buf.position()) && logFacility != null) {
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658 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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659 }
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660 if (buf.position() == 0) {
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661 throw new HgBadStateException("Bad sink implementation (consumes no bytes) results in endless loop");
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662 }
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663 buf.compact(); // ensure (a) there's space for new (b) data starts at 0
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664 progressSupport.worked(consumed);
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665 }
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666 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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667 } catch (IOException ex) {
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668 recordFailure(ex);
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669 } catch (CancelledException ex) {
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670 recordFailure(ex);
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671 } catch (HgException ex) {
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672 recordFailure(ex);
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673 }
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674 }
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675 }
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676 }