Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/Revlog.java @ 408:e732521a9eb4 smartgit3

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Issue 28: support hgignore entries with syntax prefix
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 16 Mar 2012 15:06:44 +0100
parents 728708de3597
children f52ca9530774 d0e5dc3cae6e
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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21
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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 // using toString() to identify revlog. HgDataFile.toString includes path, HgManifest and HgChangelog instances
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144 // are fine with default (class name)
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145 // Perhaps, more tailored description method would be suitable here
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146 throw new HgInvalidRevisionException(String.format("Can't find revision %s in %s", nid.shortNotation(), this), nid, null);
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147 }
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148 return revision;
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149 }
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150
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151 /**
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152 * @deprecated use {@link #getRevisionIndex(Nodeid)} instead
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153 */
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154 @Deprecated
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155 public final int getLocalRevision(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
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156 return getRevisionIndex(nid);
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157 }
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158
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159
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160 /**
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161 * Note, {@link Nodeid#NULL} nodeid is not reported as known in any revlog.
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162 *
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163 * @param nodeid
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164 * @return
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165 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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166 */
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167 public final boolean isKnown(Nodeid nodeid) throws HgInvalidControlFileException {
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168 final int rn = content.findRevisionIndex(nodeid);
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169 if (BAD_REVISION == rn) {
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170 return false;
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171 }
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172 if (rn < 0 || rn >= content.revisionCount()) {
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173 // Sanity check
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174 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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175 }
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176 return true;
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177 }
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178
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179 /**
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180 * 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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181 * @param nodeid
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182 */
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183 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException, HgInvalidRevisionException {
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184 rawContent(getRevisionIndex(nodeid), sink);
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185 }
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186
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187 /**
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188 * @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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189 * FIXME is it necessary to have IOException along with HgException here?
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190 */
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191 protected void rawContent(int fileRevisionIndex, ByteChannel sink) throws HgException, IOException, CancelledException, HgInvalidRevisionException {
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192 if (sink == null) {
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193 throw new IllegalArgumentException();
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194 }
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195 ContentPipe insp = new ContentPipe(sink, 0, repo.getContext().getLog());
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196 insp.checkCancelled();
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197 content.iterate(fileRevisionIndex, fileRevisionIndex, true, insp);
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198 insp.checkFailed();
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199 }
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200
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201 /**
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202 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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203 *
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204 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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205 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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206 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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207 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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208 * @throws HgInvalidRevisionException
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209 * @throws IllegalArgumentException
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210 */
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211 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) throws HgInvalidRevisionException, HgInvalidControlFileException {
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212 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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213 throw new HgInvalidRevisionException(revision);
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214 }
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215 if (parentRevisions == null || parentRevisions.length < 2) {
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216 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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217 }
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218 if (parent1 != null && parent1.length < 20) {
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219 throw new IllegalArgumentException(parent1.toString());
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220 }
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221 if (parent2 != null && parent2.length < 20) {
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222 throw new IllegalArgumentException(parent2.toString());
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223 }
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224 class ParentCollector implements RevlogStream.Inspector {
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225 public int p1 = -1;
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226 public int p2 = -1;
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227 public byte[] nodeid;
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228
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229 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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230 p1 = parent1Revision;
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231 p2 = parent2Revision;
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232 this.nodeid = new byte[20];
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233 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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234 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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235 }
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236 };
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237 ParentCollector pc = new ParentCollector();
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238 content.iterate(revision, revision, false, pc);
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239 parentRevisions[0] = pc.p1;
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240 parentRevisions[1] = pc.p2;
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241 if (parent1 != null) {
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242 if (parentRevisions[0] == -1) {
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243 Arrays.fill(parent1, 0, 20, (byte) 0);
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244 } else {
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245 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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246 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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247 }
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248 }
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249 if (parent2 != null) {
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250 if (parentRevisions[1] == -1) {
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251 Arrays.fill(parent2, 0, 20, (byte) 0);
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252 } else {
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253 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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254 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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255 }
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256 }
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257 }
317
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258
324
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259 @Experimental
366
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260 public void walk(int start, int end, final Revlog.Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
324
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261 int lastRev = getLastRevision();
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262 if (start == TIP) {
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263 start = lastRev;
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264 }
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265 if (end == TIP) {
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266 end = lastRev;
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267 }
356
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268 final RevisionInspector revisionInsp = Adaptable.Factory.getAdapter(inspector, RevisionInspector.class, null);
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269 final ParentInspector parentInsp = Adaptable.Factory.getAdapter(inspector, ParentInspector.class, null);
324
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270 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - start + 1];
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271
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272 content.iterate(start, end, false, new RevlogStream.Inspector() {
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273
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274 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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275 Nodeid nid = Nodeid.fromBinary(nodeid, 0);
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276 if (revisionInsp != null) {
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277 revisionInsp.next(revisionNumber, nid, linkRevision);
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278 }
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279 if (parentInsp != null) {
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280 Nodeid p1 = parent1Revision == -1 ? Nodeid.NULL : allRevisions[parent1Revision];
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281 Nodeid p2 = parent2Revision == -1 ? Nodeid.NULL : allRevisions[parent2Revision];
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282 allRevisions[revisionNumber] = nid;
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283 parentInsp.next(revisionNumber, nid, parent1Revision, parent2Revision, p1, p2);
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284 }
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285 }
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286 });
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287 }
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288
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289 /**
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290 * MARKER
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291 */
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292 @Experimental
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293 public interface Inspector {
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294 }
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295
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296 @Experimental
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297 public interface RevisionInspector extends Inspector {
368
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298 void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex);
324
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299 }
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300
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301 @Experimental
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302 public interface ParentInspector extends Inspector {
327
3f09b8c19142 Tests for Revlog.Inspectors
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303 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?)
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304 void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2);
324
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305 }
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306
29
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307 /*
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308 * XXX think over if it's better to do either:
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309 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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310 * or
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311 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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312 *
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313 * and yes, walker is not a proper name
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314 */
324
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315 public final class ParentWalker implements ParentInspector {
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316
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317
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318 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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319 private Nodeid[] sorted; // for binary search
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320 private int[] sorted2natural;
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321 private Nodeid[] firstParent;
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322 private Nodeid[] secondParent;
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323
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324 // Nodeid instances shall be shared between all arrays
29
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325
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326 public ParentWalker() {
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327 }
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328
192
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329 public HgRepository getRepo() {
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330 return Revlog.this.getRepo();
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331 }
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332
324
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333 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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334 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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335 throw new IllegalStateException(); // sanity, revisions are sequential
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336 }
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337 int ix = revisionNumber;
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338 sequential[ix] = sorted[ix] = revision;
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339 if (parent1Revision != -1) {
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340 firstParent[ix] = sequential[parent1Revision];
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341 }
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342 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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343 secondParent[ix] = sequential[parent2Revision];
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344 }
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345 }
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346
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347 public void init() throws HgInvalidControlFileException {
324
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348 final int revisionCount = Revlog.this.getRevisionCount();
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349 firstParent = new Nodeid[revisionCount];
393
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350 // TODO [post 1.0] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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351 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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352 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant)
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353 secondParent = new Nodeid[revisionCount];
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354 //
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355 sequential = new Nodeid[revisionCount];
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356 sorted = new Nodeid[revisionCount];
324
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357 Revlog.this.walk(0, TIP, this);
200
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358 Arrays.sort(sorted);
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359 sorted2natural = new int[revisionCount];
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360 for (int i = 0; i < revisionCount; i++) {
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361 Nodeid n = sequential[i];
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362 int x = Arrays.binarySearch(sorted, n);
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363 assertSortedIndex(x);
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364 sorted2natural[x] = i;
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365 }
29
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diff changeset
366 }
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367
200
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368 private void assertSortedIndex(int x) {
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369 if (x < 0) {
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370 throw new HgBadStateException();
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371 }
29
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diff changeset
372 }
31
346b66add79d Basic lookup for incoming changes
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373
393
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374 /**
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375 * Tells whether supplied revision is from the walker's associated revlog.
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diff changeset
376 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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377 * @param nid revision to check, not <code>null</code>
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378 * @return <code>true</code> if revision matches any revision in this revlog
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379 */
31
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380 public boolean knownNode(Nodeid nid) {
200
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381 return Arrays.binarySearch(sorted, nid) >= 0;
31
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diff changeset
382 }
29
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diff changeset
383
200
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384 /**
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385 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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386 */
29
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387 public Nodeid firstParent(Nodeid nid) {
200
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388 int x = Arrays.binarySearch(sorted, nid);
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389 assertSortedIndex(x);
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390 int i = sorted2natural[x];
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391 return firstParent[i];
29
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392 }
49
26e3eeaa3962 branch and user filtering for log operation
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393
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394 // never null, Nodeid.NULL if none known
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395 public Nodeid safeFirstParent(Nodeid nid) {
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396 Nodeid rv = firstParent(nid);
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397 return rv == null ? Nodeid.NULL : rv;
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diff changeset
398 }
29
6cce719bbb62 Collector for nodes and their parents
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399
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400 public Nodeid secondParent(Nodeid nid) {
200
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401 int x = Arrays.binarySearch(sorted, nid);
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402 assertSortedIndex(x);
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403 int i = sorted2natural[x];
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404 return secondParent[i];
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
405 }
6cce719bbb62 Collector for nodes and their parents
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diff changeset
406
49
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diff changeset
407 public Nodeid safeSecondParent(Nodeid nid) {
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diff changeset
408 Nodeid rv = secondParent(nid);
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diff changeset
409 return rv == null ? Nodeid.NULL : rv;
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diff changeset
410 }
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diff changeset
411
29
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diff changeset
412 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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413 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
414 assertSortedIndex(x);
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415 int i = sorted2natural[x];
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416 Nodeid p1 = firstParent[i];
29
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diff changeset
417 boolean modified = false;
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diff changeset
418 if (p1 != null) {
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diff changeset
419 modified = c.add(p1);
191
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diff changeset
420 }
200
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421 Nodeid p2 = secondParent[i];
191
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diff changeset
422 if (p2 != null) {
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diff changeset
423 modified = c.add(p2) || modified;
29
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diff changeset
424 }
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diff changeset
425 return modified;
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426 }
171
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diff changeset
427
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diff changeset
428 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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diff changeset
429 // nodes, their parents and so on.
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diff changeset
430
200
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431 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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432 // Nodeids shall belong to this revlog
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433 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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diff changeset
434 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
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diff changeset
435 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
436 int earliestRevision = Integer.MAX_VALUE;
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diff changeset
437 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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diff changeset
438 // first, find earliest index of roots in question, as there's no sense
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diff changeset
439 // to check children among nodes prior to branch's root node
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diff changeset
440 for (Nodeid r : roots) {
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diff changeset
441 int x = Arrays.binarySearch(sorted, r);
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diff changeset
442 assertSortedIndex(x);
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diff changeset
443 int i = sorted2natural[x];
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diff changeset
444 if (i < earliestRevision) {
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diff changeset
445 earliestRevision = i;
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diff changeset
446 }
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diff changeset
447 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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diff changeset
448 }
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diff changeset
449 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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diff changeset
450 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
451 parents.add(sequential[i]); // to find next child
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diff changeset
452 result.add(sequential[i]);
171
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diff changeset
453 }
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diff changeset
454 }
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
455 return result;
171
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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parents: 157
diff changeset
456 }
192
e5407b5a586a Incoming and Outgoing commands are alive
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 191
diff changeset
457
e5407b5a586a Incoming and Outgoing commands are alive
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diff changeset
458 /**
308
3f40262153a4 Recognize closed branches
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parents: 307
diff changeset
459 * @return revisions that have supplied revision as their immediate parent
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parents: 307
diff changeset
460 */
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diff changeset
461 public List<Nodeid> directChildren(Nodeid nid) {
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parents: 307
diff changeset
462 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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parents: 307
diff changeset
463 int x = Arrays.binarySearch(sorted, nid);
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parents: 307
diff changeset
464 assertSortedIndex(x);
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parents: 307
diff changeset
465 nid = sorted[x]; // canonical instance
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diff changeset
466 int start = sorted2natural[x];
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diff changeset
467 for (int i = start + 1; i < sequential.length; i++) {
3f40262153a4 Recognize closed branches
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parents: 307
diff changeset
468 if (nid == firstParent[i] || nid == secondParent[i]) {
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parents: 307
diff changeset
469 result.add(sequential[i]);
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parents: 307
diff changeset
470 }
3f40262153a4 Recognize closed branches
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parents: 307
diff changeset
471 }
3f40262153a4 Recognize closed branches
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parents: 307
diff changeset
472 return result;
3f40262153a4 Recognize closed branches
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 307
diff changeset
473 }
3f40262153a4 Recognize closed branches
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 307
diff changeset
474
3f40262153a4 Recognize closed branches
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 307
diff changeset
475 /**
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
476 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
192
e5407b5a586a Incoming and Outgoing commands are alive
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diff changeset
477 * @return <code>true</code> if there's any node in this revlog that has specified node as one of its parents.
e5407b5a586a Incoming and Outgoing commands are alive
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diff changeset
478 */
200
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diff changeset
479 public boolean hasChildren(Nodeid nid) {
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diff changeset
480 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
481 assertSortedIndex(x);
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diff changeset
482 int i = sorted2natural[x];
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diff changeset
483 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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diff changeset
484 assert firstParent.length == sequential.length;
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
485 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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diff changeset
486 final Nodeid canonicalNode = sequential[i];
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diff changeset
487 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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parents: 197
diff changeset
488 for (; i < sequential.length; i++) {
393
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489 // TODO [post 1.0] likely, not very effective.
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490 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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491 // however, need to be careful with memory usage
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492 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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493 return true;
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494 }
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495 }
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496 return false;
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497 }
29
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498 }
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499
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500 /**
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501 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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502 * multiple {@link Revlog#getRevisionIndex(Nodeid)} calls.
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503 *
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504 * {@link Revlog#getRevisionIndex(Nodeid)} with straightforward lookup approach performs O(n/2)
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505 * {@link RevisionMap#revisionIndex(Nodeid)} is log(n), plus initialization is O(n) (just once).
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506 */
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507 public final class RevisionMap implements RevisionInspector {
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508 /*
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509 * in fact, initialization is much slower as it instantiates Nodeids, while #getRevisionIndex
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510 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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511 * for complete changelog iteration.
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512 */
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513
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514 /*
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515 * XXX 3 * (x * 4) bytes. Can I do better?
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516 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural.
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517 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind)
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518 */
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519 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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520 private Nodeid[] sorted; // for binary search
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521 private int[] sorted2natural;
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522
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523 public RevisionMap() {
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524 }
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525
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526 public HgRepository getRepo() {
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527 return Revlog.this.getRepo();
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528 }
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529
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530 public void next(int revisionIndex, Nodeid revision, int linkedRevision) {
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diff changeset
531 sequential[revisionIndex] = sorted[revisionIndex] = revision;
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532 }
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533
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534 /**
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535 * @return <code>this</code> for convenience.
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536 */
366
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diff changeset
537 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) throws HgInvalidControlFileException{
243
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538 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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539 final int revisionCount = Revlog.this.getRevisionCount();
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540 sequential = new Nodeid[revisionCount];
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541 sorted = new Nodeid[revisionCount];
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diff changeset
542 Revlog.this.walk(0, TIP, this);
307
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543 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted.
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544 // the way sorted2natural was build is O(n*log n).
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545 final ArrayHelper ah = new ArrayHelper();
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546 ah.sort(sorted);
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547 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based
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diff changeset
548 sorted2natural = ah.getReverse();
243
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549 return this;
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550 }
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551
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552 public Nodeid revision(int revisionIndex) {
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553 return sequential[revisionIndex];
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554 }
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555 public int revisionIndex(Nodeid revision) {
274
9fb50c04f03c Use Nodeid.isNull check instead of NULL.equals
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diff changeset
556 if (revision == null || revision.isNull()) {
243
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557 return BAD_REVISION;
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558 }
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559 int x = Arrays.binarySearch(sorted, revision);
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560 if (x < 0) {
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561 return BAD_REVISION;
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diff changeset
562 }
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563 return sorted2natural[x]-1;
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564 }
367
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diff changeset
565 /**
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diff changeset
566 * @deprecated use {@link #revisionIndex(Nodeid)} instead
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diff changeset
567 */
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diff changeset
568 @Deprecated
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diff changeset
569 public int localRevision(Nodeid revision) {
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diff changeset
570 return revisionIndex(revision);
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diff changeset
571 }
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572 }
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573
277
74e7493a042a Favor delegation over generalization
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diff changeset
574 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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diff changeset
575 private Exception failure;
277
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576 private CancelSupport cancelSupport;
157
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577
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578 protected void setCancelSupport(CancelSupport cs) {
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579 assert cancelSupport == null; // no reason to set it twice
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580 cancelSupport = cs;
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581 }
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582
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diff changeset
583 protected void recordFailure(Exception ex) {
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
584 assert failure == null;
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diff changeset
585 failure = ex;
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586 }
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587
d5268ca7715b Merged branch wrap-data-access into default for resource-friendly data access. Updated API to promote that friendliness to clients (channels, not byte[]). More exceptions
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diff changeset
588 public void checkFailed() throws HgException, IOException, CancelledException {
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589 if (failure == null) {
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diff changeset
590 return;
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591 }
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diff changeset
592 if (failure instanceof IOException) {
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diff changeset
593 throw (IOException) failure;
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594 }
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diff changeset
595 if (failure instanceof CancelledException) {
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596 throw (CancelledException) failure;
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diff changeset
597 }
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diff changeset
598 if (failure instanceof HgException) {
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diff changeset
599 throw (HgException) failure;
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diff changeset
600 }
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diff changeset
601 throw new HgBadStateException(failure);
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602 }
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603
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604 public void checkCancelled() throws CancelledException {
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605 if (cancelSupport != null) {
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606 cancelSupport.checkCancelled();
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607 }
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608 }
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609 }
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610
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611 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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612 private final ByteChannel sink;
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613 private final int offset;
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614 private final LogFacility logFacility;
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615
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616 /**
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617 * @param _sink - cannot be <code>null</code>
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618 * @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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619 * @param log optional facility to put warnings/debug messages into, may be null.
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620 */
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621 public ContentPipe(ByteChannel _sink, int seekOffset, LogFacility log) {
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622 assert _sink != null;
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623 sink = _sink;
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624 setCancelSupport(CancelSupport.Factory.get(_sink));
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625 offset = seekOffset;
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626 logFacility = log;
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627 }
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628
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629 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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630 if (offset > 0) { // save few useless reset/rewind operations
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631 da.seek(offset);
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632 }
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633 }
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634
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635 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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636 try {
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637 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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638 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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639 ByteBuffer buf = ByteBuffer.allocate(actualLen > 8192 ? 8192 : actualLen);
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640 Preview p = Adaptable.Factory.getAdapter(sink, Preview.class, null);
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641 if (p != null) {
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642 progressSupport.start(2 * da.length());
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643 while (!da.isEmpty()) {
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644 checkCancelled();
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645 da.readBytes(buf);
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646 p.preview(buf);
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647 buf.clear();
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648 }
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649 da.reset();
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650 prepare(revisionNumber, da);
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651 progressSupport.worked(da.length());
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652 buf.clear();
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653 } else {
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654 progressSupport.start(da.length());
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655 }
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656 while (!da.isEmpty()) {
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657 checkCancelled();
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658 da.readBytes(buf);
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659 buf.flip(); // post: position == 0
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660 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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661
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662 int consumed = sink.write(buf);
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663 if ((consumed == 0 || consumed != buf.position()) && logFacility != null) {
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664 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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665 }
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666 if (buf.position() == 0) {
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667 throw new HgBadStateException("Bad sink implementation (consumes no bytes) results in endless loop");
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668 }
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669 buf.compact(); // ensure (a) there's space for new (b) data starts at 0
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670 progressSupport.worked(consumed);
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671 }
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672 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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673 } catch (IOException ex) {
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674 recordFailure(ex);
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675 } catch (CancelledException ex) {
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676 recordFailure(ex);
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677 } catch (HgException ex) {
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678 recordFailure(ex);
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679 }
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680 }
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681 }
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682 }