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annotate src/org/tmatesoft/hg/repo/Revlog.java @ 319:fa4aea41746e

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 29 Sep 2011 04:37:52 +0200
parents 09628675bcee
children 283b294d1079
rev   line source
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1 /*
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2 * Copyright (c) 2010-2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.repo;
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24 import java.util.ArrayList;
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25 import java.util.Arrays;
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26 import java.util.Collection;
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27 import java.util.HashSet;
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28 import java.util.LinkedList;
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29 import java.util.List;
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31 import org.tmatesoft.hg.core.HgBadStateException;
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32 import org.tmatesoft.hg.core.HgException;
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33 import org.tmatesoft.hg.core.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.RevlogStream;
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37 import org.tmatesoft.hg.util.ByteChannel;
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38 import org.tmatesoft.hg.util.CancelSupport;
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39 import org.tmatesoft.hg.util.CancelledException;
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40 import org.tmatesoft.hg.util.ProgressSupport;
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42
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43 /**
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44 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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45 *
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46 * Implementation note:
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47 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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48 * in public methods.
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49 *
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50 * @author Artem Tikhomirov
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51 * @author TMate Software Ltd.
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52 */
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53 abstract class Revlog {
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55 private final HgRepository repo;
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56 protected final RevlogStream content;
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58 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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59 if (hgRepo == null) {
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60 throw new IllegalArgumentException();
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61 }
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62 if (contentStream == null) {
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63 throw new IllegalArgumentException();
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64 }
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65 repo = hgRepo;
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66 content = contentStream;
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67 }
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69 // invalid Revlog
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70 protected Revlog(HgRepository hgRepo) {
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71 repo = hgRepo;
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72 content = null;
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73 }
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75 public final HgRepository getRepo() {
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76 return repo;
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77 }
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79 public final int getRevisionCount() {
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80 return content.revisionCount();
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81 }
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83 public final int getLastRevision() {
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84 return content.revisionCount() - 1;
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85 }
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86
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87 public final Nodeid getRevision(int revision) {
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88 // XXX cache nodeids?
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89 return Nodeid.fromBinary(content.nodeid(revision), 0);
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90 }
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92 public final List<Nodeid> getRevisions(int... revisions) {
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93 ArrayList<Nodeid> rv = new ArrayList<Nodeid>(revisions.length);
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94 Arrays.sort(revisions);
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95 getRevisionsInternal(rv, revisions);
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96 return rv;
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97 }
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99 /*package-local*/ void getRevisionsInternal(final List<Nodeid> retVal, int[] sortedRevs) {
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100 // once I have getRevisionMap and may find out whether it is avalable from cache,
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101 // may use it, perhaps only for small number of revisions
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102 content.iterate(sortedRevs, false, new RevlogStream.Inspector() {
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103
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104 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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105 retVal.add(Nodeid.fromBinary(nodeid, 0));
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106 }
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107 });
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108 }
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110 /**
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111 * Get local revision number (index) of the specified revision.
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112 *
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113 * For occasional queries, this method works with decent performance, despite its O(n/2) approach.
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114 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link RevisionMap} may come handy.
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115 *
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116 * @param nid revision to look up
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117 * @return revision index, or {@link HgRepository#BAD_REVISION} if specified revision not found.
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118 */
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119 public final int getLocalRevision(Nodeid nid) {
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120 int revision = content.findLocalRevisionNumber(nid);
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121 if (revision == BAD_REVISION) {
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122 throw new IllegalArgumentException(String.format("%s doesn't represent a revision of %s", nid.toString(), this /*XXX HgDataFile.getPath might be more suitable here*/));
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123 }
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124 return revision;
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125 }
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126
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127 // Till now, i follow approach that NULL nodeid is never part of revlog
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128 public final boolean isKnown(Nodeid nodeid) {
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129 final int rn = content.findLocalRevisionNumber(nodeid);
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130 if (BAD_REVISION == rn) {
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131 return false;
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132 }
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133 if (rn < 0 || rn >= content.revisionCount()) {
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134 // Sanity check
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135 throw new IllegalStateException();
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136 }
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137 return true;
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138 }
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139
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140 /**
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141 * 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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142 * @param nodeid
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143 */
157
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144 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException {
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145 rawContent(getLocalRevision(nodeid), sink);
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146 }
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147
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148 /**
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149 * @param revision - repo-local index of this file change (not a changelog revision number!)
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150 */
157
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151 protected void rawContent(int revision, ByteChannel sink) throws HgException, IOException, CancelledException {
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152 if (sink == null) {
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153 throw new IllegalArgumentException();
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154 }
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155 ContentPipe insp = new ContentPipe(sink, 0);
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156 insp.checkCancelled();
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157 content.iterate(revision, revision, true, insp);
157
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158 insp.checkFailed();
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159 }
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160
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161 /**
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162 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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163 *
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164 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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165 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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166 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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167 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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168 * @return
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169 */
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170 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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171 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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172 throw new IllegalArgumentException(String.valueOf(revision));
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173 }
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174 if (parentRevisions == null || parentRevisions.length < 2) {
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175 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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176 }
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177 if (parent1 != null && parent1.length < 20) {
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178 throw new IllegalArgumentException(parent1.toString());
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179 }
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180 if (parent2 != null && parent2.length < 20) {
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181 throw new IllegalArgumentException(parent2.toString());
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182 }
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183 class ParentCollector implements RevlogStream.Inspector {
56
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184 public int p1 = -1;
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185 public int p2 = -1;
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186 public byte[] nodeid;
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187
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188 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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189 p1 = parent1Revision;
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190 p2 = parent2Revision;
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191 this.nodeid = new byte[20];
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192 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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193 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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194 }
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195 };
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196 ParentCollector pc = new ParentCollector();
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197 content.iterate(revision, revision, false, pc);
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198 parentRevisions[0] = pc.p1;
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199 parentRevisions[1] = pc.p2;
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200 if (parent1 != null) {
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201 if (parentRevisions[0] == -1) {
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202 Arrays.fill(parent1, 0, 20, (byte) 0);
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203 } else {
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204 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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205 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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206 }
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207 }
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208 if (parent2 != null) {
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209 if (parentRevisions[1] == -1) {
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210 Arrays.fill(parent2, 0, 20, (byte) 0);
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211 } else {
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212 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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213 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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214 }
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215 }
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216 }
317
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217
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218 /*
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219 * XXX think over if it's better to do either:
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220 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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221 * or
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222 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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223 *
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224 * and yes, walker is not a proper name
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225 */
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226 public final class ParentWalker {
200
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227
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228
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229 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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230 private Nodeid[] sorted; // for binary search
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231 private int[] sorted2natural;
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232 private Nodeid[] firstParent;
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233 private Nodeid[] secondParent;
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234
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235 // Nodeid instances shall be shared between all arrays
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236
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237 public ParentWalker() {
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238 }
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239
192
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240 public HgRepository getRepo() {
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241 return Revlog.this.getRepo();
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242 }
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243
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244 public void init() {
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245 final RevlogStream stream = Revlog.this.content;
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246 final int revisionCount = stream.revisionCount();
200
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247 firstParent = new Nodeid[revisionCount];
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248 // although branches/merges are less frequent, and most of secondParent would be -1/null, some sort of
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249 // SparseOrderedList might be handy, provided its inner structures do not overweight simplicity of an array
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250 secondParent = new Nodeid[revisionCount];
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251 //
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252 sequential = new Nodeid[revisionCount];
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253 sorted = new Nodeid[revisionCount];
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254
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255 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
200
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256
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257 int ix = 0;
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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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258 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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259 if (ix != revisionNumber) {
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260 // XXX temp code, just to make sure I understand what's going on here
243
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261 // FIXME check against cpython or another tool-mangled repository
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262 throw new IllegalStateException();
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263 }
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264 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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265 throw new IllegalStateException(); // sanity, revisions are sequential
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266 }
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267 final Nodeid nid = new Nodeid(nodeid, true);
200
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268 sequential[ix] = sorted[ix] = nid;
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269 if (parent1Revision != -1) {
200
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270 assert parent1Revision < ix;
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271 firstParent[ix] = sequential[parent1Revision];
183
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272 }
200
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273 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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274 assert parent2Revision < ix;
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275 secondParent[ix] = sequential[parent2Revision];
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276 }
200
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277 ix++;
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278 }
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279 };
197
3a7696fb457c Investigate optimization options to allow fast processing of huge repositories. Fix defect in StatusCollector that lead to wrong result comparing first revision to empty repo (-1 to 0), due to same TIP constant value
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280 stream.iterate(0, TIP, false, insp);
200
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281 Arrays.sort(sorted);
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282 sorted2natural = new int[revisionCount];
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283 for (int i = 0; i < revisionCount; i++) {
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284 Nodeid n = sequential[i];
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285 int x = Arrays.binarySearch(sorted, n);
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286 assertSortedIndex(x);
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287 sorted2natural[x] = i;
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288 }
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289 }
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290
200
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291 private void assertSortedIndex(int x) {
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292 if (x < 0) {
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293 throw new HgBadStateException();
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294 }
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295 }
31
346b66add79d Basic lookup for incoming changes
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296
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297 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
200
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298 // right now Nodeid.NULL is not recognized as known if passed to this method,
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299 // caller is supposed to make explicit check
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300 public boolean knownNode(Nodeid nid) {
200
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301 return Arrays.binarySearch(sorted, nid) >= 0;
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302 }
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303
200
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304 /**
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305 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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306 */
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307 public Nodeid firstParent(Nodeid nid) {
200
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308 int x = Arrays.binarySearch(sorted, nid);
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309 assertSortedIndex(x);
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310 int i = sorted2natural[x];
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311 return firstParent[i];
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312 }
49
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313
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314 // never null, Nodeid.NULL if none known
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315 public Nodeid safeFirstParent(Nodeid nid) {
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316 Nodeid rv = firstParent(nid);
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317 return rv == null ? Nodeid.NULL : rv;
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318 }
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319
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320 public Nodeid secondParent(Nodeid nid) {
200
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321 int x = Arrays.binarySearch(sorted, nid);
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322 assertSortedIndex(x);
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323 int i = sorted2natural[x];
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324 return secondParent[i];
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325 }
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326
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327 public Nodeid safeSecondParent(Nodeid nid) {
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328 Nodeid rv = secondParent(nid);
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329 return rv == null ? Nodeid.NULL : rv;
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330 }
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331
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332 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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333 int x = Arrays.binarySearch(sorted, nid);
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334 assertSortedIndex(x);
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335 int i = sorted2natural[x];
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336 Nodeid p1 = firstParent[i];
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337 boolean modified = false;
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338 if (p1 != null) {
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339 modified = c.add(p1);
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340 }
200
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341 Nodeid p2 = secondParent[i];
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342 if (p2 != null) {
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diff changeset
343 modified = c.add(p2) || modified;
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diff changeset
344 }
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345 return modified;
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346 }
171
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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347
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348 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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diff changeset
349 // nodes, their parents and so on.
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diff changeset
350
200
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diff changeset
351 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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diff changeset
352 // Nodeids shall belong to this revlog
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353 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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354 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
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355 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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356 int earliestRevision = Integer.MAX_VALUE;
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357 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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diff changeset
358 // first, find earliest index of roots in question, as there's no sense
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diff changeset
359 // to check children among nodes prior to branch's root node
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360 for (Nodeid r : roots) {
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361 int x = Arrays.binarySearch(sorted, r);
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362 assertSortedIndex(x);
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diff changeset
363 int i = sorted2natural[x];
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364 if (i < earliestRevision) {
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365 earliestRevision = i;
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366 }
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367 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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368 }
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369 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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370 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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371 parents.add(sequential[i]); // to find next child
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372 result.add(sequential[i]);
171
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373 }
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374 }
200
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375 return result;
171
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376 }
192
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377
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378 /**
308
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379 * @return revisions that have supplied revision as their immediate parent
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380 */
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381 public List<Nodeid> directChildren(Nodeid nid) {
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382 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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383 int x = Arrays.binarySearch(sorted, nid);
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384 assertSortedIndex(x);
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385 nid = sorted[x]; // canonical instance
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386 int start = sorted2natural[x];
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387 for (int i = start + 1; i < sequential.length; i++) {
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388 if (nid == firstParent[i] || nid == secondParent[i]) {
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389 result.add(sequential[i]);
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390 }
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391 }
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392 return result;
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393 }
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394
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395 /**
200
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396 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
192
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397 * @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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398 */
200
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399 public boolean hasChildren(Nodeid nid) {
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400 int x = Arrays.binarySearch(sorted, nid);
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401 assertSortedIndex(x);
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402 int i = sorted2natural[x];
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403 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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404 assert firstParent.length == sequential.length;
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405 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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406 final Nodeid canonicalNode = sequential[i];
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407 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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408 for (; i < sequential.length; i++) {
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409 // FIXME likely, not very effective.
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410 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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411 // however, need to be careful with memory usage
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412 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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413 return true;
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414 }
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415 }
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416 return false;
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417 }
29
6cce719bbb62 Collector for nodes and their parents
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418 }
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419
243
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420 /**
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421 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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422 * multiple {@link Revlog#getLocalRevision(Nodeid)} calls.
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423 *
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424 * getLocalRevision(Nodeid) with straightforward lookup approach performs O(n/2)
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425 * #localRevision() is log(n), plus initialization is O(n)
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426 */
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427 public final class RevisionMap {
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428 /*
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429 * in fact, initialization is much slower as it instantiates Nodeids, while #getLocalRevision
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430 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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431 * for complete changelog iteration.
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432 */
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433
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434 /*
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435 * XXX 3 * (x * 4) bytes. Can I do better?
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436 */
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437 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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438 private Nodeid[] sorted; // for binary search
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439 private int[] sorted2natural;
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440
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441 public RevisionMap() {
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442 }
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443
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444 public HgRepository getRepo() {
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445 return Revlog.this.getRepo();
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446 }
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447
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448 /**
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449 * @return <code>this</code> for convenience.
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450 */
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451 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) {
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452 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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453 final int revisionCount = Revlog.this.content.revisionCount();
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454 sequential = new Nodeid[revisionCount];
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455 sorted = new Nodeid[revisionCount];
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456 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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457
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458 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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459 final Nodeid nid = new Nodeid(nodeid, true);
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460 sequential[revisionNumber] = sorted[revisionNumber] = nid;
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461 }
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462 };
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diff changeset
463 Revlog.this.content.iterate(0, TIP, false, insp);
307
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diff changeset
464 // next is alternative to Arrays.sort(sorted), and build sorted2natural looking up each element of sequential in sorted.
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diff changeset
465 // the way sorted2natural was build is O(n*log n).
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466 final ArrayHelper ah = new ArrayHelper();
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467 ah.sort(sorted);
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468 // note, values in ArrayHelper#getReversed are 1-based indexes, not 0-based
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diff changeset
469 sorted2natural = ah.getReverse();
243
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470 return this;
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471 }
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472
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473 public Nodeid revision(int localRevision) {
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474 return sequential[localRevision];
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475 }
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476 public int localRevision(Nodeid revision) {
274
9fb50c04f03c Use Nodeid.isNull check instead of NULL.equals
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diff changeset
477 if (revision == null || revision.isNull()) {
243
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478 return BAD_REVISION;
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479 }
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480 int x = Arrays.binarySearch(sorted, revision);
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diff changeset
481 if (x < 0) {
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diff changeset
482 return BAD_REVISION;
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diff changeset
483 }
307
2f2ab5c27f41 Collect sort reverse indexes along with array sorting
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diff changeset
484 return sorted2natural[x]-1;
243
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485 }
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diff changeset
486 }
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diff changeset
487
277
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diff changeset
488 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
157
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
489 private Exception failure;
277
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490 private CancelSupport cancelSupport;
157
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diff changeset
491
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492 protected void setCancelSupport(CancelSupport cs) {
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493 assert cancelSupport == null; // no reason to set it twice
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494 cancelSupport = cs;
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495 }
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496
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497 protected void recordFailure(Exception ex) {
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498 assert failure == null;
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499 failure = ex;
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500 }
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501
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502 public void checkFailed() throws HgException, IOException, CancelledException {
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503 if (failure == null) {
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504 return;
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505 }
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506 if (failure instanceof IOException) {
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507 throw (IOException) failure;
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508 }
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509 if (failure instanceof CancelledException) {
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510 throw (CancelledException) failure;
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511 }
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512 if (failure instanceof HgException) {
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513 throw (HgException) failure;
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514 }
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515 throw new HgBadStateException(failure);
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516 }
277
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517
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518 public void checkCancelled() throws CancelledException {
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519 if (cancelSupport != null) {
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520 cancelSupport.checkCancelled();
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521 }
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522 }
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523 }
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524
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525 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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526 private final ByteChannel sink;
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527 private final int offset;
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528
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529 /**
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530 * @param _sink - cannot be <code>null</code>
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531 * @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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532 */
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533 public ContentPipe(ByteChannel _sink, int seekOffset) {
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534 assert _sink != null;
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535 sink = _sink;
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536 setCancelSupport(CancelSupport.Factory.get(_sink));
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537 offset = seekOffset;
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538 }
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539
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540 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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541 if (offset > 0) { // save few useless reset/rewind operations
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542 da.seek(offset);
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543 }
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544 }
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545
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546 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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547 try {
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548 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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549 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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550 ByteBuffer buf = ByteBuffer.allocate(512);
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551 progressSupport.start(da.length());
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552 while (!da.isEmpty()) {
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553 checkCancelled();
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554 da.readBytes(buf);
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555 buf.flip();
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556 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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557 int consumed = sink.write(buf);
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558 // FIXME in fact, bad sink implementation (that consumes no bytes) would result in endless loop. Need to account for this
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559 buf.compact();
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560 progressSupport.worked(consumed);
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561 }
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562 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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563 } catch (IOException ex) {
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564 recordFailure(ex);
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565 } catch (CancelledException ex) {
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566 recordFailure(ex);
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567 } catch (HgException ex) {
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568 recordFailure(ex);
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569 }
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570 }
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571 }
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572 }