Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/Revlog.java @ 423:9c9c442b5f2e

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Major refactoring of exception handling. Low-level API uses RuntimeExceptions, while checked are left for higher level
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 23 Mar 2012 22:51:18 +0100
parents 7f136a3fa671
children 6437d261048a
rev   line source
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1 /*
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2 * Copyright (c) 2010-2012 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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18
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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23 import java.io.IOException;
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24 import java.nio.ByteBuffer;
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25 import java.util.ArrayList;
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26 import java.util.Arrays;
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27 import java.util.Collection;
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28 import java.util.HashSet;
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29 import java.util.LinkedList;
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30 import java.util.List;
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32 import org.tmatesoft.hg.core.HgException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.internal.ArrayHelper;
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35 import org.tmatesoft.hg.internal.DataAccess;
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36 import org.tmatesoft.hg.internal.Experimental;
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37 import org.tmatesoft.hg.internal.Preview;
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38 import org.tmatesoft.hg.internal.RevlogStream;
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39 import org.tmatesoft.hg.util.Adaptable;
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40 import org.tmatesoft.hg.util.ByteChannel;
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41 import org.tmatesoft.hg.util.CancelSupport;
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42 import org.tmatesoft.hg.util.CancelledException;
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43 import org.tmatesoft.hg.util.LogFacility;
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44 import org.tmatesoft.hg.util.ProgressSupport;
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46
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47 /**
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48 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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49 *
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50 * Implementation note:
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51 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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52 * in public methods.
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53 *
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54 * @author Artem Tikhomirov
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55 * @author TMate Software Ltd.
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56 */
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57 abstract class Revlog {
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58
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59 private final HgRepository repo;
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60 protected final RevlogStream content;
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61
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62 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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63 if (hgRepo == null) {
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64 throw new IllegalArgumentException();
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65 }
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66 if (contentStream == null) {
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67 throw new IllegalArgumentException();
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68 }
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69 repo = hgRepo;
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70 content = contentStream;
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71 }
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73 // invalid Revlog
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74 protected Revlog(HgRepository hgRepo) {
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75 repo = hgRepo;
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76 content = null;
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77 }
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79 public final HgRepository getRepo() {
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80 return repo;
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81 }
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82
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83 public final int getRevisionCount() {
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84 return content.revisionCount();
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85 }
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86
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87 public final int getLastRevision() {
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88 return content.revisionCount() - 1;
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89 }
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90
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91 /**
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92 * Map revision index to unique revision identifier (nodeid).
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93 *
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94 * @param revision index of the entry in this revlog, may be {@link HgRepository#TIP}
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95 * @return revision nodeid of the entry
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96 *
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97 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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98 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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99 */
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100 public final Nodeid getRevision(int revision) throws HgInvalidRevisionException, HgInvalidControlFileException {
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101 // XXX cache nodeids? Rather, if context.getCache(this).getRevisionMap(create == false) != null, use it
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102 return Nodeid.fromBinary(content.nodeid(revision), 0);
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103 }
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104
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105 /**
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106 * 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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107 */
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108 public final List<Nodeid> getRevisions(int... revisions) throws HgInvalidRevisionException, HgInvalidControlFileException {
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109 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length);
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110 Arrays.sort(revisions);
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111 getRevisionsInternal(rv, revisions);
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112 return rv;
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113 }
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114
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115 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) throws HgInvalidRevisionException, HgInvalidControlFileException {
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116 // once I have getRevisionMap and may find out whether it is avalable from cache,
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117 // may use it, perhaps only for small number of revisions
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118 content.iterate(sortedRevs, false, new RevlogStream.Inspector() {
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119
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120 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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121 retVal.add(Nodeid.fromBinary(nodeid, 0));
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122 }
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123 });
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124 }
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125
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126 /**
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127 * Get local index of the specified revision.
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128 * If unsure, use {@link #isKnown(Nodeid)} to find out whether nodeid belongs to this revlog.
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129 *
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130 * For occasional queries, this method works with decent performance, despite its O(n/2) approach.
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131 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link Revlog.RevisionMap} may come handy.
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132 *
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133 * @param nid revision to look up
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134 * @return revision local index in this revlog
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135 * @throws HgInvalidRevisionException if supplied nodeid doesn't identify any revision from this revlog
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136 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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137 */
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138 public final int getRevisionIndex(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
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139 int revision = content.findRevisionIndex(nid);
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140 if (revision == BAD_REVISION) {
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141 // using toString() to identify revlog. HgDataFile.toString includes path, HgManifest and HgChangelog instances
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142 // are fine with default (class name)
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143 // Perhaps, more tailored description method would be suitable here
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144 throw new HgInvalidRevisionException(String.format("Can't find revision %s in %s", nid.shortNotation(), this), nid, null);
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145 }
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146 return revision;
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147 }
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148
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149 /**
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150 * @deprecated use {@link #getRevisionIndex(Nodeid)} instead
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151 */
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152 @Deprecated
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153 public final int getLocalRevision(Nodeid nid) throws HgInvalidControlFileException, HgInvalidRevisionException {
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154 return getRevisionIndex(nid);
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155 }
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156
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157
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158 /**
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159 * Note, {@link Nodeid#NULL} nodeid is not reported as known in any revlog.
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160 *
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161 * @param nodeid
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162 * @return <code>true</code> if revision is part of this revlog
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163 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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164 */
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165 public final boolean isKnown(Nodeid nodeid) throws HgInvalidControlFileException {
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166 final int rn = content.findRevisionIndex(nodeid);
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167 if (BAD_REVISION == rn) {
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168 return false;
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169 }
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170 if (rn < 0 || rn >= content.revisionCount()) {
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171 // Sanity check
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172 throw new HgInvalidStateException(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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173 }
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174 return true;
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175 }
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176
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177 /**
394
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178 * Access to revision data as is, equivalent to <code>rawContent(getRevisionIndex(nodeid), sink)</code>
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179 *
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180 * @param nodeid revision to retrieve
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181 * @param sink data destination
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182 *
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183 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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184 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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185 * @throws CancelledException if content retrieval operation was cancelled
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186 *
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187 * @see #rawContent(int, ByteChannel)
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188 */
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189 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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190 rawContent(getRevisionIndex(nodeid), sink);
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191 }
29
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192
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193 /**
394
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194 * 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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195 *
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196 * @param revisionIndex index of this revlog change (not a changelog revision index), non-negative. From predefined constants, only {@link HgRepository#TIP} makes sense.
394
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197 * @param sink data destination
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198 *
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199 * @throws HgInvalidRevisionException if supplied argument doesn't represent revision index in this revlog
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200 * @throws HgInvalidControlFileException if access to revlog index/data entry failed
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201 * @throws CancelledException if content retrieval operation was cancelled
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202 */
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203 protected void rawContent(int revisionIndex, ByteChannel sink) throws HgInvalidControlFileException, CancelledException, HgInvalidRevisionException {
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204 if (sink == null) {
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205 throw new IllegalArgumentException();
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206 }
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207 try {
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208 ContentPipe insp = new ContentPipe(sink, 0, repo.getContext().getLog());
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209 insp.checkCancelled();
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210 content.iterate(revisionIndex, revisionIndex, true, insp);
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211 insp.checkFailed();
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212 } catch (IOException ex) {
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213 HgInvalidControlFileException e = new HgInvalidControlFileException(String.format("Access to revision %d content failed", revisionIndex), ex, null);
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214 e.setRevisionIndex(revisionIndex);
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215 // TODO post 1.0 e.setFileName(content.getIndexFile() or this.getHumanFriendlyPath()) - shall decide whether
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216 // protected abstract getHFPath() with impl in HgDataFile, HgManifest and HgChangelog or path is data of either Revlog or RevlogStream
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217 // Do the same (add file name) below
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218 throw e;
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219 } catch (HgInvalidControlFileException ex) {
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220 throw ex;
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221 } catch (HgException ex) {
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222 HgInvalidControlFileException e = new HgInvalidControlFileException(ex.getClass().getSimpleName(), ex, null);
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223 e.setRevisionIndex(revisionIndex);
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224 throw e;
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225 }
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226 }
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227
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228 /**
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229 * Fills supplied arguments with information about revision parents.
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230 *
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231 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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232 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1}), {@link HgRepository#NO_REVISION} indicates parent not set
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233 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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234 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
347
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235 * @throws HgInvalidRevisionException
418
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236 * @throws HgInvalidControlFileException FIXME EXCEPTIONS
347
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237 * @throws IllegalArgumentException
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238 */
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239 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) throws HgInvalidRevisionException, HgInvalidControlFileException {
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240 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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241 throw new HgInvalidRevisionException(revision);
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242 }
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243 if (parentRevisions == null || parentRevisions.length < 2) {
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244 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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245 }
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246 if (parent1 != null && parent1.length < 20) {
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247 throw new IllegalArgumentException(parent1.toString());
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248 }
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249 if (parent2 != null && parent2.length < 20) {
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250 throw new IllegalArgumentException(parent2.toString());
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251 }
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252 class ParentCollector implements RevlogStream.Inspector {
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253 public int p1 = -1;
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254 public int p2 = -1;
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255 public byte[] nodeid;
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256
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257 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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258 p1 = parent1Revision;
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259 p2 = parent2Revision;
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260 this.nodeid = new byte[20];
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261 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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262 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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263 }
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264 };
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265 ParentCollector pc = new ParentCollector();
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266 content.iterate(revision, revision, false, pc);
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267 // although next code looks odd (NO_REVISION *is* -1), it's safer to be explicit
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268 parentRevisions[0] = pc.p1 == -1 ? NO_REVISION : pc.p1;
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269 parentRevisions[1] = pc.p2 == -1 ? NO_REVISION : pc.p2;
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270 if (parent1 != null) {
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271 if (parentRevisions[0] == NO_REVISION) {
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272 Arrays.fill(parent1, 0, 20, (byte) 0);
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273 } else {
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274 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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275 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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276 }
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277 }
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278 if (parent2 != null) {
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279 if (parentRevisions[1] == NO_REVISION) {
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280 Arrays.fill(parent2, 0, 20, (byte) 0);
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281 } else {
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282 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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283 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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284 }
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285 }
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286 }
317
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287
324
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288 @Experimental
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289 public void walk(int start, int end, final Revlog.Inspector inspector) throws HgInvalidRevisionException, HgInvalidControlFileException {
324
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290 int lastRev = getLastRevision();
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291 if (start == TIP) {
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292 start = lastRev;
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293 }
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294 if (end == TIP) {
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295 end = lastRev;
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296 }
356
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297 final RevisionInspector revisionInsp = Adaptable.Factory.getAdapter(inspector, RevisionInspector.class, null);
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298 final ParentInspector parentInsp = Adaptable.Factory.getAdapter(inspector, ParentInspector.class, null);
324
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299 final Nodeid[] allRevisions = parentInsp == null ? null : new Nodeid[end - start + 1];
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300
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301 content.iterate(start, end, false, new RevlogStream.Inspector() {
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302
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303 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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304 Nodeid nid = Nodeid.fromBinary(nodeid, 0);
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305 if (revisionInsp != null) {
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306 revisionInsp.next(revisionNumber, nid, linkRevision);
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307 }
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308 if (parentInsp != null) {
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309 Nodeid p1 = parent1Revision == -1 ? Nodeid.NULL : allRevisions[parent1Revision];
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310 Nodeid p2 = parent2Revision == -1 ? Nodeid.NULL : allRevisions[parent2Revision];
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311 allRevisions[revisionNumber] = nid;
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312 parentInsp.next(revisionNumber, nid, parent1Revision, parent2Revision, p1, p2);
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313 }
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314 }
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315 });
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316 }
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317
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318 /**
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319 * MARKER
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320 */
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321 @Experimental
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322 public interface Inspector {
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323 }
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324
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325 @Experimental
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326 public interface RevisionInspector extends Inspector {
368
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327 void next(int revisionIndex, Nodeid revision, int linkedRevisionIndex);
324
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328 }
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329
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330 @Experimental
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331 public interface ParentInspector extends Inspector {
327
3f09b8c19142 Tests for Revlog.Inspectors
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332 // XXX document whether parentX is -1 or a constant (BAD_REVISION? or dedicated?)
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333 void next(int revisionIndex, Nodeid revision, int parent1, int parent2, Nodeid nidParent1, Nodeid nidParent2);
324
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334 }
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335
29
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336 /*
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337 * XXX think over if it's better to do either:
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338 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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339 * or
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340 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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341 *
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342 * and yes, walker is not a proper name
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343 */
324
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344 public final class ParentWalker implements ParentInspector {
200
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345
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346
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347 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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348 private Nodeid[] sorted; // for binary search
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349 private int[] sorted2natural;
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350 private Nodeid[] firstParent;
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351 private Nodeid[] secondParent;
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352
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353 // Nodeid instances shall be shared between all arrays
29
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354
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355 public ParentWalker() {
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356 }
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357
192
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358 public HgRepository getRepo() {
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359 return Revlog.this.getRepo();
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360 }
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361
324
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362 public void next(int revisionNumber, Nodeid revision, int parent1Revision, int parent2Revision, Nodeid nidParent1, Nodeid nidParent2) {
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363 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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364 throw new IllegalStateException(); // sanity, revisions are sequential
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365 }
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366 int ix = revisionNumber;
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367 sequential[ix] = sorted[ix] = revision;
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368 if (parent1Revision != -1) {
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369 firstParent[ix] = sequential[parent1Revision];
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370 }
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371 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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372 secondParent[ix] = sequential[parent2Revision];
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373 }
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374 }
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375
366
189dc6dc1c3e Use exceptions to expose errors reading mercurial data
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376 public void init() throws HgInvalidControlFileException {
324
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377 final int revisionCount = Revlog.this.getRevisionCount();
200
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378 firstParent = new Nodeid[revisionCount];
393
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379 // TODO [post 1.0] Branches/merges are less frequent, and most of secondParent would be -1/null, hence
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380 // IntMap might be better alternative here, but need to carefully analyze (test) whether this brings
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381 // real improvement (IntMap has 2n capacity, and element lookup is log(n) instead of array's constant)
200
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382 secondParent = new Nodeid[revisionCount];
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383 //
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384 sequential = new Nodeid[revisionCount];
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385 sorted = new Nodeid[revisionCount];
324
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386 Revlog.this.walk(0, TIP, this);
200
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387 Arrays.sort(sorted);
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388 sorted2natural = new int[revisionCount];
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389 for (int i = 0; i < revisionCount; i++) {
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390 Nodeid n = sequential[i];
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391 int x = Arrays.binarySearch(sorted, n);
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392 assertSortedIndex(x);
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393 sorted2natural[x] = i;
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394 }
29
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395 }
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396
200
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397 private void assertSortedIndex(int x) {
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398 if (x < 0) {
423
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399 throw new HgInvalidStateException(String.format("Bad index", x));
200
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400 }
29
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401 }
31
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402
393
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403 /**
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404 * Tells whether supplied revision is from the walker's associated revlog.
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405 * Note, {@link Nodeid#NULL}, although implicitly present as parent of a first revision, is not recognized as known.
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406 * @param nid revision to check, not <code>null</code>
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407 * @return <code>true</code> if revision matches any revision in this revlog
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408 */
31
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409 public boolean knownNode(Nodeid nid) {
200
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410 return Arrays.binarySearch(sorted, nid) >= 0;
31
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411 }
29
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412
200
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413 /**
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414 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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415 */
29
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416 public Nodeid firstParent(Nodeid nid) {
200
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417 int x = Arrays.binarySearch(sorted, nid);
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418 assertSortedIndex(x);
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419 int i = sorted2natural[x];
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420 return firstParent[i];
29
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421 }
49
26e3eeaa3962 branch and user filtering for log operation
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diff changeset
422
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423 // never null, Nodeid.NULL if none known
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424 public Nodeid safeFirstParent(Nodeid nid) {
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425 Nodeid rv = firstParent(nid);
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426 return rv == null ? Nodeid.NULL : rv;
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diff changeset
427 }
29
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428
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429 public Nodeid secondParent(Nodeid nid) {
200
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430 int x = Arrays.binarySearch(sorted, nid);
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431 assertSortedIndex(x);
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432 int i = sorted2natural[x];
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433 return secondParent[i];
29
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diff changeset
434 }
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diff changeset
435
49
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diff changeset
436 public Nodeid safeSecondParent(Nodeid nid) {
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diff changeset
437 Nodeid rv = secondParent(nid);
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diff changeset
438 return rv == null ? Nodeid.NULL : rv;
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diff changeset
439 }
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diff changeset
440
29
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diff changeset
441 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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diff changeset
442 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
443 assertSortedIndex(x);
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444 int i = sorted2natural[x];
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diff changeset
445 Nodeid p1 = firstParent[i];
29
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diff changeset
446 boolean modified = false;
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diff changeset
447 if (p1 != null) {
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diff changeset
448 modified = c.add(p1);
191
b777502a06f5 Do not assume second parent can be set only when first one is set, again
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diff changeset
449 }
200
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450 Nodeid p2 = secondParent[i];
191
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diff changeset
451 if (p2 != null) {
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diff changeset
452 modified = c.add(p2) || modified;
29
6cce719bbb62 Collector for nodes and their parents
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diff changeset
453 }
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diff changeset
454 return modified;
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diff changeset
455 }
171
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
456
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
457 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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diff changeset
458 // nodes, their parents and so on.
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diff changeset
459
200
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diff changeset
460 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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diff changeset
461 // Nodeids shall belong to this revlog
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diff changeset
462 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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diff changeset
463 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
464 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
465 int earliestRevision = Integer.MAX_VALUE;
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diff changeset
466 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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diff changeset
467 // first, find earliest index of roots in question, as there's no sense
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diff changeset
468 // to check children among nodes prior to branch's root node
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diff changeset
469 for (Nodeid r : roots) {
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
470 int x = Arrays.binarySearch(sorted, r);
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diff changeset
471 assertSortedIndex(x);
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diff changeset
472 int i = sorted2natural[x];
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
473 if (i < earliestRevision) {
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
474 earliestRevision = i;
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diff changeset
475 }
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
476 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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diff changeset
477 }
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diff changeset
478 for (int i = earliestRevision + 1; i < sequential.length; i++) {
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
479 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
480 parents.add(sequential[i]); // to find next child
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diff changeset
481 result.add(sequential[i]);
171
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diff changeset
482 }
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
483 }
200
114c9fe7b643 Performance optimization: reduce memory ParentWalker hogs
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diff changeset
484 return result;
171
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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parents: 157
diff changeset
485 }
192
e5407b5a586a Incoming and Outgoing commands are alive
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parents: 191
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486
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487 /**
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488 * @return revisions that have supplied revision as their immediate parent
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489 */
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490 public List<Nodeid> directChildren(Nodeid nid) {
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491 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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492 int x = Arrays.binarySearch(sorted, nid);
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493 assertSortedIndex(x);
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494 nid = sorted[x]; // canonical instance
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495 int start = sorted2natural[x];
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496 for (int i = start + 1; i < sequential.length; i++) {
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497 if (nid == firstParent[i] || nid == secondParent[i]) {
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498 result.add(sequential[i]);
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499 }
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500 }
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501 return result;
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502 }
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503
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504 /**
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505 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
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506 * @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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507 */
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508 public boolean hasChildren(Nodeid nid) {
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509 int x = Arrays.binarySearch(sorted, nid);
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510 assertSortedIndex(x);
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511 int i = sorted2natural[x];
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512 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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513 assert firstParent.length == sequential.length;
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514 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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515 final Nodeid canonicalNode = sequential[i];
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516 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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517 for (; i < sequential.length; i++) {
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518 // TODO [post 1.0] likely, not very effective.
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519 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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520 // however, need to be careful with memory usage
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521 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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522 return true;
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523 }
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524 }
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525 return false;
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526 }
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527 }
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528
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529 /**
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530 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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531 * multiple {@link Revlog#getRevisionIndex(Nodeid)} calls.
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532 *
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533 * {@link Revlog#getRevisionIndex(Nodeid)} with straightforward lookup approach performs O(n/2)
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534 * {@link RevisionMap#revisionIndex(Nodeid)} is log(n), plus initialization is O(n) (just once).
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535 */
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536 public final class RevisionMap implements RevisionInspector {
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537 /*
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538 * in fact, initialization is much slower as it instantiates Nodeids, while #getRevisionIndex
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539 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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540 * for complete changelog iteration.
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541 */
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542
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543 /*
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544 * XXX 3 * (x * 4) bytes. Can I do better?
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545 * It seems, yes. Don't need to keep sorted, always can emulate it with indirect access to sequential through sorted2natural.
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546 * i.e. instead sorted[mid].compareTo(toFind), do sequential[sorted2natural[mid]].compareTo(toFind)
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547 */
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548 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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549 private Nodeid[] sorted; // for binary search
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550 private int[] sorted2natural;
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551
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552 public RevisionMap() {
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553 }
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554
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555 public HgRepository getRepo() {
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556 return Revlog.this.getRepo();
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557 }
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558
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559 public void next(int revisionIndex, Nodeid revision, int linkedRevision) {
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560 sequential[revisionIndex] = sorted[revisionIndex] = revision;
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561 }
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562
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563 /**
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564 * @return <code>this</code> for convenience.
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565 */
366
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566 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) throws HgInvalidControlFileException{
243
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567 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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568 final int revisionCount = Revlog.this.getRevisionCount();
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569 sequential = new Nodeid[revisionCount];
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570 sorted = new Nodeid[revisionCount];
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571 Revlog.this.walk(0, TIP, this);
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572 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted.
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573 // the way sorted2natural was build is O(n*log n).
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574 final ArrayHelper ah = new ArrayHelper();
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575 ah.sort(sorted);
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576 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based
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diff changeset
577 sorted2natural = ah.getReverse();
243
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578 return this;
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579 }
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580
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diff changeset
581 public Nodeid revision(int revisionIndex) {
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582 return sequential[revisionIndex];
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583 }
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584 public int revisionIndex(Nodeid revision) {
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585 if (revision == null || revision.isNull()) {
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586 return BAD_REVISION;
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587 }
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588 int x = Arrays.binarySearch(sorted, revision);
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589 if (x < 0) {
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590 return BAD_REVISION;
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diff changeset
591 }
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592 return sorted2natural[x]-1;
243
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593 }
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diff changeset
594 /**
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diff changeset
595 * @deprecated use {@link #revisionIndex(Nodeid)} instead
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diff changeset
596 */
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diff changeset
597 @Deprecated
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diff changeset
598 public int localRevision(Nodeid revision) {
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diff changeset
599 return revisionIndex(revision);
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diff changeset
600 }
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601 }
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602
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diff changeset
603 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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diff changeset
604 private Exception failure;
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605 private CancelSupport cancelSupport;
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606
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607 protected void setCancelSupport(CancelSupport cs) {
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608 assert cancelSupport == null; // no reason to set it twice
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609 cancelSupport = cs;
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610 }
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611
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612 protected void recordFailure(Exception ex) {
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613 assert failure == null;
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614 failure = ex;
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615 }
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616
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617 // FIXME is HgException of any use here now?
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618 // TODO consider if IOException in addition to HgException is of any real utility
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619 public void checkFailed() throws HgException, IOException, CancelledException {
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620 if (failure == null) {
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621 return;
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622 }
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623 if (failure instanceof IOException) {
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624 throw (IOException) failure;
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625 }
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626 if (failure instanceof CancelledException) {
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627 throw (CancelledException) failure;
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628 }
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629 if (failure instanceof HgException) {
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630 throw (HgException) failure;
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631 }
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632 throw new HgInvalidStateException(failure.toString());
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633 }
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634
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635 public void checkCancelled() throws CancelledException {
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636 if (cancelSupport != null) {
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637 cancelSupport.checkCancelled();
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638 }
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639 }
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640 }
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641
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642 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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643 private final ByteChannel sink;
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644 private final int offset;
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645 private final LogFacility logFacility;
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646
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647 /**
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648 * @param _sink - cannot be <code>null</code>
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649 * @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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650 * @param log optional facility to put warnings/debug messages into, may be null.
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651 */
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652 public ContentPipe(ByteChannel _sink, int seekOffset, LogFacility log) {
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653 assert _sink != null;
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654 sink = _sink;
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655 setCancelSupport(CancelSupport.Factory.get(_sink));
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656 offset = seekOffset;
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657 logFacility = log;
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658 }
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659
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660 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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661 if (offset > 0) { // save few useless reset/rewind operations
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662 da.seek(offset);
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663 }
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664 }
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665
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666 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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667 try {
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668 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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669 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
355
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670 ByteBuffer buf = ByteBuffer.allocate(actualLen > 8192 ? 8192 : actualLen);
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671 Preview p = Adaptable.Factory.getAdapter(sink, Preview.class, null);
355
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672 if (p != null) {
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673 progressSupport.start(2 * da.length());
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674 while (!da.isEmpty()) {
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675 checkCancelled();
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676 da.readBytes(buf);
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677 p.preview(buf);
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678 buf.clear();
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679 }
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680 da.reset();
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681 prepare(revisionNumber, da);
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682 progressSupport.worked(da.length());
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683 buf.clear();
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684 } else {
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685 progressSupport.start(da.length());
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686 }
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687 while (!da.isEmpty()) {
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688 checkCancelled();
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689 da.readBytes(buf);
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690 buf.flip(); // post: position == 0
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691 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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692
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693 int consumed = sink.write(buf);
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694 if ((consumed == 0 || consumed != buf.position()) && logFacility != null) {
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695 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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696 }
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697 if (buf.position() == 0) {
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698 throw new HgInvalidStateException("Bad sink implementation (consumes no bytes) results in endless loop");
355
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699 }
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700 buf.compact(); // ensure (a) there's space for new (b) data starts at 0
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701 progressSupport.worked(consumed);
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702 }
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703 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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704 } catch (IOException ex) {
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705 recordFailure(ex);
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706 } catch (CancelledException ex) {
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707 recordFailure(ex);
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708 } catch (HgException ex) {
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709 recordFailure(ex);
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710 }
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711 }
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712 }
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713 }