Mercurial > hg4j

annotate src/org/tmatesoft/hg/repo/Revlog.java @ 284:7232b94f2ae3

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
HgDirstate shall operate with Path instead of String for file names. Use of Pair instead of array of unspecified length for parents.
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Sat, 03 Sep 2011 13:12:13 +0200
parents 74e7493a042a
children 2f2ab5c27f41
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.Arrays;
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25 import java.util.Collection;
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26 import java.util.HashSet;
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27 import java.util.LinkedList;
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28 import java.util.List;
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30 import org.tmatesoft.hg.core.HgBadStateException;
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31 import org.tmatesoft.hg.core.HgException;
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32 import org.tmatesoft.hg.core.Nodeid;
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33 import org.tmatesoft.hg.internal.DataAccess;
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34 import org.tmatesoft.hg.internal.RevlogStream;
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35 import org.tmatesoft.hg.util.ByteChannel;
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36 import org.tmatesoft.hg.util.CancelSupport;
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37 import org.tmatesoft.hg.util.CancelledException;
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38 import org.tmatesoft.hg.util.ProgressSupport;
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40
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41 /**
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42 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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43 *
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44 * Implementation note:
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45 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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46 * in public methods.
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47 *
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48 * @author Artem Tikhomirov
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49 * @author TMate Software Ltd.
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50 */
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51 abstract class Revlog {
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52
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53 private final HgRepository repo;
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54 protected final RevlogStream content;
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56 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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57 if (hgRepo == null) {
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58 throw new IllegalArgumentException();
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59 }
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60 if (contentStream == null) {
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61 throw new IllegalArgumentException();
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62 }
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63 repo = hgRepo;
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64 content = contentStream;
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65 }
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67 // invalid Revlog
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68 protected Revlog(HgRepository hgRepo) {
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69 repo = hgRepo;
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70 content = null;
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71 }
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73 public final HgRepository getRepo() {
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74 return repo;
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75 }
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76
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77 public final int getRevisionCount() {
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78 return content.revisionCount();
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79 }
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81 public final int getLastRevision() {
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82 return content.revisionCount() - 1;
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83 }
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84
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85 public final Nodeid getRevision(int revision) {
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86 // XXX cache nodeids?
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87 return Nodeid.fromBinary(content.nodeid(revision), 0);
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88 }
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89
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90 /**
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91 * Get local revision number (index) of the specified revision.
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92 *
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93 * For occasional queries, this method works with decent performance, despite its O(n/2) approach.
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94 * Alternatively, if you need to perform multiple queries (e.g. at least 15-20), {@link RevisionMap} may come handy.
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95 *
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96 * @param nid revision to look up
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97 * @return revision index, or {@link HgRepository#BAD_REVISION} if specified revision not found.
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98 */
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99 public final int getLocalRevision(Nodeid nid) {
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100 int revision = content.findLocalRevisionNumber(nid);
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101 if (revision == BAD_REVISION) {
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102 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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103 }
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104 return revision;
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105 }
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106
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107 // Till now, i follow approach that NULL nodeid is never part of revlog
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108 public final boolean isKnown(Nodeid nodeid) {
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109 final int rn = content.findLocalRevisionNumber(nodeid);
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110 if (BAD_REVISION == rn) {
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111 return false;
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112 }
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113 if (rn < 0 || rn >= content.revisionCount()) {
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114 // Sanity check
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115 throw new IllegalStateException();
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116 }
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117 return true;
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118 }
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119
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120 /**
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121 * 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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122 * @param nodeid
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123 */
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124 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException {
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125 rawContent(getLocalRevision(nodeid), sink);
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126 }
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127
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128 /**
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129 * @param revision - repo-local index of this file change (not a changelog revision number!)
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130 */
157
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131 protected void rawContent(int revision, ByteChannel sink) throws HgException, IOException, CancelledException {
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132 if (sink == null) {
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133 throw new IllegalArgumentException();
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134 }
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135 ContentPipe insp = new ContentPipe(sink, 0);
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136 insp.checkCancelled();
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137 content.iterate(revision, revision, true, insp);
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138 insp.checkFailed();
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139 }
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140
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141 /**
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142 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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143 *
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144 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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145 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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146 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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147 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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148 * @return
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149 */
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150 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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151 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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152 throw new IllegalArgumentException(String.valueOf(revision));
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153 }
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154 if (parentRevisions == null || parentRevisions.length < 2) {
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155 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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156 }
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157 if (parent1 != null && parent1.length < 20) {
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158 throw new IllegalArgumentException(parent1.toString());
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159 }
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160 if (parent2 != null && parent2.length < 20) {
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161 throw new IllegalArgumentException(parent2.toString());
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162 }
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163 class ParentCollector implements RevlogStream.Inspector {
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164 public int p1 = -1;
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165 public int p2 = -1;
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166 public byte[] nodeid;
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167
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168 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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169 p1 = parent1Revision;
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170 p2 = parent2Revision;
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171 this.nodeid = new byte[20];
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172 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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173 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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174 }
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175 };
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176 ParentCollector pc = new ParentCollector();
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177 content.iterate(revision, revision, false, pc);
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178 parentRevisions[0] = pc.p1;
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179 parentRevisions[1] = pc.p2;
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180 if (parent1 != null) {
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181 if (parentRevisions[0] == -1) {
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182 Arrays.fill(parent1, 0, 20, (byte) 0);
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183 } else {
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184 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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185 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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186 }
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187 }
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188 if (parent2 != null) {
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189 if (parentRevisions[1] == -1) {
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190 Arrays.fill(parent2, 0, 20, (byte) 0);
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191 } else {
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192 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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193 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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194 }
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195 }
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196 }
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197
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198 /*
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199 * XXX think over if it's better to do either:
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200 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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201 * or
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202 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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203 *
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204 * and yes, walker is not a proper name
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205 */
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206 public final class ParentWalker {
200
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207
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208
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209 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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210 private Nodeid[] sorted; // for binary search
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211 private int[] sorted2natural;
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212 private Nodeid[] firstParent;
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213 private Nodeid[] secondParent;
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214
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215 // Nodeid instances shall be shared between all arrays
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216
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217 public ParentWalker() {
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218 }
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219
192
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220 public HgRepository getRepo() {
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221 return Revlog.this.getRepo();
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222 }
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223
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224 public void init() {
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225 final RevlogStream stream = Revlog.this.content;
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226 final int revisionCount = stream.revisionCount();
200
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227 firstParent = new Nodeid[revisionCount];
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228 // although branches/merges are less frequent, and most of secondParent would be -1/null, some sort of
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229 // SparseOrderedList might be handy, provided its inner structures do not overweight simplicity of an array
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230 secondParent = new Nodeid[revisionCount];
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231 //
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232 sequential = new Nodeid[revisionCount];
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233 sorted = new Nodeid[revisionCount];
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234
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235 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
200
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236
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237 int ix = 0;
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diff changeset
238 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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239 if (ix != revisionNumber) {
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240 // XXX temp code, just to make sure I understand what's going on here
243
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241 // FIXME check against cpython or another tool-mangled repository
29
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242 throw new IllegalStateException();
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243 }
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244 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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245 throw new IllegalStateException(); // sanity, revisions are sequential
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246 }
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247 final Nodeid nid = new Nodeid(nodeid, true);
200
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248 sequential[ix] = sorted[ix] = nid;
29
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249 if (parent1Revision != -1) {
200
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250 assert parent1Revision < ix;
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251 firstParent[ix] = sequential[parent1Revision];
183
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252 }
200
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253 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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254 assert parent2Revision < ix;
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255 secondParent[ix] = sequential[parent2Revision];
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256 }
200
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257 ix++;
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258 }
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259 };
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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260 stream.iterate(0, TIP, false, insp);
200
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261 Arrays.sort(sorted);
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262 sorted2natural = new int[revisionCount];
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263 for (int i = 0; i < revisionCount; i++) {
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264 Nodeid n = sequential[i];
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265 int x = Arrays.binarySearch(sorted, n);
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266 assertSortedIndex(x);
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267 sorted2natural[x] = i;
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268 }
29
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269 }
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270
200
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271 private void assertSortedIndex(int x) {
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272 if (x < 0) {
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273 throw new HgBadStateException();
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274 }
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275 }
31
346b66add79d Basic lookup for incoming changes
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276
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277 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
200
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278 // right now Nodeid.NULL is not recognized as known if passed to this method,
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279 // caller is supposed to make explicit check
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280 public boolean knownNode(Nodeid nid) {
200
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281 return Arrays.binarySearch(sorted, nid) >= 0;
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282 }
29
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283
200
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284 /**
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285 * null if none. only known nodes (as per #knownNode) are accepted as arguments
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286 */
29
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287 public Nodeid firstParent(Nodeid nid) {
200
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288 int x = Arrays.binarySearch(sorted, nid);
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289 assertSortedIndex(x);
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290 int i = sorted2natural[x];
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291 return firstParent[i];
29
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292 }
49
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293
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294 // never null, Nodeid.NULL if none known
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295 public Nodeid safeFirstParent(Nodeid nid) {
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296 Nodeid rv = firstParent(nid);
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297 return rv == null ? Nodeid.NULL : rv;
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298 }
29
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299
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300 public Nodeid secondParent(Nodeid nid) {
200
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301 int x = Arrays.binarySearch(sorted, nid);
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302 assertSortedIndex(x);
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303 int i = sorted2natural[x];
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304 return secondParent[i];
29
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305 }
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306
49
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307 public Nodeid safeSecondParent(Nodeid nid) {
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308 Nodeid rv = secondParent(nid);
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309 return rv == null ? Nodeid.NULL : rv;
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310 }
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311
29
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312 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
200
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313 int x = Arrays.binarySearch(sorted, nid);
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314 assertSortedIndex(x);
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315 int i = sorted2natural[x];
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316 Nodeid p1 = firstParent[i];
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diff changeset
317 boolean modified = false;
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318 if (p1 != null) {
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319 modified = c.add(p1);
191
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320 }
200
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321 Nodeid p2 = secondParent[i];
191
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diff changeset
322 if (p2 != null) {
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diff changeset
323 modified = c.add(p2) || modified;
29
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diff changeset
324 }
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325 return modified;
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326 }
171
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diff changeset
327
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328 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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diff changeset
329 // nodes, their parents and so on.
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diff changeset
330
200
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diff changeset
331 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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diff changeset
332 // Nodeids shall belong to this revlog
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333 public List<Nodeid> childrenOf(List<Nodeid> roots) {
171
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diff changeset
334 HashSet<Nodeid> parents = new HashSet<Nodeid>();
200
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diff changeset
335 LinkedList<Nodeid> result = new LinkedList<Nodeid>();
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diff changeset
336 int earliestRevision = Integer.MAX_VALUE;
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diff changeset
337 assert sequential.length == firstParent.length && firstParent.length == secondParent.length;
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diff changeset
338 // first, find earliest index of roots in question, as there's no sense
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diff changeset
339 // to check children among nodes prior to branch's root node
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340 for (Nodeid r : roots) {
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diff changeset
341 int x = Arrays.binarySearch(sorted, r);
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342 assertSortedIndex(x);
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diff changeset
343 int i = sorted2natural[x];
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diff changeset
344 if (i < earliestRevision) {
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345 earliestRevision = i;
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346 }
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347 parents.add(sequential[i]); // add canonical instance in hope equals() is bit faster when can do a ==
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348 }
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349 for (int i = earliestRevision + 1; i < sequential.length; i++) {
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diff changeset
350 if (parents.contains(firstParent[i]) || parents.contains(secondParent[i])) {
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diff changeset
351 parents.add(sequential[i]); // to find next child
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352 result.add(sequential[i]);
171
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353 }
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354 }
200
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355 return result;
171
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diff changeset
356 }
192
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357
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diff changeset
358 /**
200
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359 * @param nid possibly parent node, shall be {@link #knownNode(Nodeid) known} in this revlog.
192
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diff changeset
360 * @return <code>true</code> if there's any node in this revlog that has specified node as one of its parents.
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diff changeset
361 */
200
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diff changeset
362 public boolean hasChildren(Nodeid nid) {
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diff changeset
363 int x = Arrays.binarySearch(sorted, nid);
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diff changeset
364 assertSortedIndex(x);
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diff changeset
365 int i = sorted2natural[x];
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diff changeset
366 assert firstParent.length == secondParent.length; // just in case later I implement sparse array for secondParent
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diff changeset
367 assert firstParent.length == sequential.length;
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368 // to use == instead of equals, take the same Nodeid instance we used to fill all the arrays.
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369 final Nodeid canonicalNode = sequential[i];
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370 i++; // no need to check node itself. child nodes may appear in sequential only after revision in question
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371 for (; i < sequential.length; i++) {
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372 // FIXME likely, not very effective.
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373 // May want to optimize it with another (Tree|Hash)Set, created on demand on first use,
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374 // however, need to be careful with memory usage
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375 if (firstParent[i] == canonicalNode || secondParent[i] == canonicalNode) {
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376 return true;
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377 }
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378 }
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379 return false;
192
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380 }
29
6cce719bbb62 Collector for nodes and their parents
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381 }
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382
243
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383 /**
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384 * Effective int to Nodeid and vice versa translation. It's advised to use this class instead of
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385 * multiple {@link Revlog#getLocalRevision(Nodeid)} calls.
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386 *
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387 * getLocalRevision(Nodeid) with straightforward lookup approach performs O(n/2)
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388 * #localRevision() is log(n), plus initialization is O(n)
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389 */
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390 public final class RevisionMap {
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391 /*
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392 * in fact, initialization is much slower as it instantiates Nodeids, while #getLocalRevision
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393 * compares directly against byte buffer. Measuring cpython with 70k+ gives 3 times difference (47 vs 171)
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394 * for complete changelog iteration.
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395 */
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396
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397 /*
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398 * XXX 3 * (x * 4) bytes. Can I do better?
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399 */
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400 private Nodeid[] sequential; // natural repository order, childrenOf rely on ordering
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401 private Nodeid[] sorted; // for binary search
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402 private int[] sorted2natural;
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403
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404 public RevisionMap() {
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405 }
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406
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407 public HgRepository getRepo() {
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408 return Revlog.this.getRepo();
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409 }
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410
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411 /**
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412 * @return <code>this</code> for convenience.
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413 */
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414 public RevisionMap init(/*XXX Pool<Nodeid> to reuse nodeids, if possible. */) {
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415 // XXX HgRepository.register((RepoChangeListener) this); // listen to changes in repo, re-init if needed?
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416 final int revisionCount = Revlog.this.content.revisionCount();
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417 sequential = new Nodeid[revisionCount];
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418 sorted = new Nodeid[revisionCount];
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419 sorted2natural = new int[revisionCount];
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420 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
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421
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422 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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423 final Nodeid nid = new Nodeid(nodeid, true);
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424 sequential[revisionNumber] = sorted[revisionNumber] = nid;
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425 }
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426 };
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427 Revlog.this.content.iterate(0, TIP, false, insp);
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428 Arrays.sort(sorted);
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429 for (int i = 0; i < revisionCount; i++) {
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430 Nodeid n = sequential[i];
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431 int x = Arrays.binarySearch(sorted, n);
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432 sorted2natural[x] = i;
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433 }
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434 return this;
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435 }
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436
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437 public Nodeid revision(int localRevision) {
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438 return sequential[localRevision];
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439 }
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440 public int localRevision(Nodeid revision) {
274
9fb50c04f03c Use Nodeid.isNull check instead of NULL.equals
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441 if (revision == null || revision.isNull()) {
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442 return BAD_REVISION;
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443 }
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444 int x = Arrays.binarySearch(sorted, revision);
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445 if (x < 0) {
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446 return BAD_REVISION;
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447 }
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448 return sorted2natural[x];
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449 }
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450 }
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451
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452 protected abstract static class ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
157
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453 private Exception failure;
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454 private CancelSupport cancelSupport;
157
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455
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456 protected void setCancelSupport(CancelSupport cs) {
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457 assert cancelSupport == null; // no reason to set it twice
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458 cancelSupport = cs;
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459 }
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460
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461 protected void recordFailure(Exception ex) {
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462 assert failure == null;
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463 failure = ex;
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464 }
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465
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466 public void checkFailed() throws HgException, IOException, CancelledException {
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467 if (failure == null) {
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468 return;
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469 }
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470 if (failure instanceof IOException) {
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471 throw (IOException) failure;
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472 }
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473 if (failure instanceof CancelledException) {
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474 throw (CancelledException) failure;
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475 }
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476 if (failure instanceof HgException) {
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477 throw (HgException) failure;
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478 }
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479 throw new HgBadStateException(failure);
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480 }
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481
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482 public void checkCancelled() throws CancelledException {
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483 if (cancelSupport != null) {
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484 cancelSupport.checkCancelled();
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485 }
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486 }
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487 }
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488
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489 protected static class ContentPipe extends ErrorHandlingInspector implements RevlogStream.Inspector, CancelSupport {
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490 private final ByteChannel sink;
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491 private final int offset;
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492
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493 /**
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494 * @param _sink - cannot be <code>null</code>
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495 * @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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496 */
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497 public ContentPipe(ByteChannel _sink, int seekOffset) {
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498 assert _sink != null;
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499 sink = _sink;
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500 setCancelSupport(CancelSupport.Factory.get(_sink));
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501 offset = seekOffset;
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502 }
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503
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504 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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505 if (offset > 0) { // save few useless reset/rewind operations
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506 da.seek(offset);
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507 }
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508 }
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509
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510 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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511 try {
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512 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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513 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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514 ByteBuffer buf = ByteBuffer.allocate(512);
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515 progressSupport.start(da.length());
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516 while (!da.isEmpty()) {
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517 checkCancelled();
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518 da.readBytes(buf);
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519 buf.flip();
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520 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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521 int consumed = sink.write(buf);
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522 // FIXME in fact, bad sink implementation (that consumes no bytes) would result in endless loop. Need to account for this
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523 buf.compact();
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524 progressSupport.worked(consumed);
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525 }
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526 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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527 } catch (IOException ex) {
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528 recordFailure(ex);
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529 } catch (CancelledException ex) {
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530 recordFailure(ex);
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531 } catch (HgException ex) {
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532 recordFailure(ex);
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533 }
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534 }
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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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535 }
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08db726a0fb7 Shaping out low-level Hg structures
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536 }