Mercurial > jhg

annotate src/org/tmatesoft/hg/repo/Revlog.java @ 178:62665d8f0686

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Complete logic to discover all branches missing locally. Most of wire protocol in HgRemoteRepository
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 06 Apr 2011 01:34:16 +0200
parents 2c3e96674e2a
children 9807bf8f3a9c
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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18
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19 import static org.tmatesoft.hg.repo.HgRepository.BAD_REVISION;
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20 import static org.tmatesoft.hg.repo.HgRepository.TIP;
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21
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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24 import java.util.Arrays;
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25 import java.util.Collection;
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26 import java.util.Collections;
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27 import java.util.HashMap;
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28 import java.util.HashSet;
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29 import java.util.LinkedHashSet;
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30 import java.util.LinkedList;
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31 import java.util.List;
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32 import java.util.Map;
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33 import java.util.Set;
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34
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35 import org.tmatesoft.hg.core.HgBadStateException;
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36 import org.tmatesoft.hg.core.HgException;
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37 import org.tmatesoft.hg.core.Nodeid;
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38 import org.tmatesoft.hg.internal.DataAccess;
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39 import org.tmatesoft.hg.internal.RevlogStream;
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40 import org.tmatesoft.hg.util.ByteChannel;
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41 import org.tmatesoft.hg.util.CancelSupport;
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42 import org.tmatesoft.hg.util.CancelledException;
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43 import org.tmatesoft.hg.util.ProgressSupport;
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45
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46 /**
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47 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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48 *
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49 * Implementation note:
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50 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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51 * in public methods.
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52 *
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53 * @author Artem Tikhomirov
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54 * @author TMate Software Ltd.
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55 */
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56 abstract class Revlog {
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58 private final HgRepository repo;
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59 protected final RevlogStream content;
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61 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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62 if (hgRepo == null) {
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63 throw new IllegalArgumentException();
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64 }
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65 if (contentStream == null) {
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66 throw new IllegalArgumentException();
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67 }
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68 repo = hgRepo;
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69 content = contentStream;
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70 }
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72 // invalid Revlog
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73 protected Revlog(HgRepository hgRepo) {
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74 repo = hgRepo;
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75 content = null;
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76 }
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78 public final HgRepository getRepo() {
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79 return repo;
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80 }
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81
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82 public final int getRevisionCount() {
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83 return content.revisionCount();
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84 }
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86 public final int getLastRevision() {
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87 return content.revisionCount() - 1;
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88 }
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89
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90 public final Nodeid getRevision(int revision) {
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91 // XXX cache nodeids?
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92 return Nodeid.fromBinary(content.nodeid(revision), 0);
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93 }
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95 public final int getLocalRevision(Nodeid nid) {
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96 int revision = content.findLocalRevisionNumber(nid);
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97 if (revision == BAD_REVISION) {
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98 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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99 }
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100 return revision;
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101 }
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102
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103 // Till now, i follow approach that NULL nodeid is never part of revlog
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104 public final boolean isKnown(Nodeid nodeid) {
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105 final int rn = content.findLocalRevisionNumber(nodeid);
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106 if (Integer.MIN_VALUE == rn) {
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107 return false;
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108 }
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109 if (rn < 0 || rn >= content.revisionCount()) {
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110 // Sanity check
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111 throw new IllegalStateException();
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112 }
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113 return true;
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114 }
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115
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116 /**
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117 * 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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118 * @param nodeid
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119 */
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120 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException {
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121 rawContent(getLocalRevision(nodeid), sink);
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122 }
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123
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124 /**
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125 * @param revision - repo-local index of this file change (not a changelog revision number!)
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126 */
157
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127 protected void rawContent(int revision, ByteChannel sink) throws HgException, IOException, CancelledException {
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128 if (sink == null) {
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129 throw new IllegalArgumentException();
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130 }
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131 ContentPipe insp = new ContentPipe(sink, 0);
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132 insp.checkCancelled();
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133 content.iterate(revision, revision, true, insp);
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134 insp.checkFailed();
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135 }
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136
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137 /**
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138 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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139 *
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140 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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141 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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142 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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143 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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144 * @return
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145 */
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146 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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147 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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148 throw new IllegalArgumentException(String.valueOf(revision));
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149 }
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150 if (parentRevisions == null || parentRevisions.length < 2) {
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151 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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152 }
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153 if (parent1 != null && parent1.length < 20) {
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154 throw new IllegalArgumentException(parent1.toString());
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155 }
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156 if (parent2 != null && parent2.length < 20) {
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157 throw new IllegalArgumentException(parent2.toString());
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158 }
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159 class ParentCollector implements RevlogStream.Inspector {
56
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160 public int p1 = -1;
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161 public int p2 = -1;
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162 public byte[] nodeid;
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163
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164 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
56
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165 p1 = parent1Revision;
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166 p2 = parent2Revision;
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167 this.nodeid = new byte[20];
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168 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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169 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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170 }
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171 };
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172 ParentCollector pc = new ParentCollector();
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173 content.iterate(revision, revision, false, pc);
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174 parentRevisions[0] = pc.p1;
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175 parentRevisions[1] = pc.p2;
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176 if (parent1 != null) {
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177 if (parentRevisions[0] == -1) {
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178 Arrays.fill(parent1, 0, 20, (byte) 0);
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179 } else {
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180 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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181 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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182 }
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183 }
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184 if (parent2 != null) {
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185 if (parentRevisions[1] == -1) {
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186 Arrays.fill(parent2, 0, 20, (byte) 0);
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187 } else {
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188 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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189 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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190 }
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191 }
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192 }
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193
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194 /*
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195 * XXX think over if it's better to do either:
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196 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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197 * or
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198 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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199 *
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200 * and yes, walker is not a proper name
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201 */
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202 public final class ParentWalker {
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203 private Map<Nodeid, Nodeid> firstParent;
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204 private Map<Nodeid, Nodeid> secondParent;
171
2c3e96674e2a Towards outgoing changes - initial detection logic, get connected with remote repo stub
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205 private final LinkedHashSet<Nodeid> allNodes = new LinkedHashSet<Nodeid>(); // childrenOf rely on ordering
29
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206
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207 public ParentWalker() {
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208 firstParent = secondParent = Collections.emptyMap();
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209 }
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210
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211 public void init() {
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212 final RevlogStream stream = Revlog.this.content;
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213 final int revisionCount = stream.revisionCount();
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214 firstParent = new HashMap<Nodeid, Nodeid>(revisionCount);
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215 secondParent = new HashMap<Nodeid, Nodeid>(firstParent.size() >> 1); // assume branches/merges are less frequent
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diff changeset
216
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diff changeset
217 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
29
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diff changeset
218 final Nodeid[] sequentialRevisionNodeids = new Nodeid[revisionCount];
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219 int ix = 0;
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220 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
29
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221 if (ix != revisionNumber) {
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222 // XXX temp code, just to make sure I understand what's going on here
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223 throw new IllegalStateException();
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224 }
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225 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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226 throw new IllegalStateException(); // sanity, revisions are sequential
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227 }
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228 final Nodeid nid = new Nodeid(nodeid, true);
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229 sequentialRevisionNodeids[ix++] = nid;
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230 allNodes.add(nid);
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231 if (parent1Revision != -1) {
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diff changeset
232 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]);
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233 if (parent2Revision != -1) {
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diff changeset
234 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]);
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235 }
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236 }
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237 }
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238 };
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diff changeset
239 stream.iterate(0, -1, false, insp);
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240 }
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241
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242 public Set<Nodeid> allNodes() {
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243 return Collections.unmodifiableSet(allNodes);
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244 }
31
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245
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246 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
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247 public boolean knownNode(Nodeid nid) {
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248 return allNodes.contains(nid);
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249 }
29
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250
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251 // null if none
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252 public Nodeid firstParent(Nodeid nid) {
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253 return firstParent.get(nid);
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254 }
49
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255
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256 // never null, Nodeid.NULL if none known
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257 public Nodeid safeFirstParent(Nodeid nid) {
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258 Nodeid rv = firstParent(nid);
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259 return rv == null ? Nodeid.NULL : rv;
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260 }
29
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261
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262 public Nodeid secondParent(Nodeid nid) {
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263 return secondParent.get(nid);
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264 }
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265
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266 public Nodeid safeSecondParent(Nodeid nid) {
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267 Nodeid rv = secondParent(nid);
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268 return rv == null ? Nodeid.NULL : rv;
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269 }
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270
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271 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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272 Nodeid p1 = firstParent(nid);
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273 boolean modified = false;
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274 if (p1 != null) {
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275 modified = c.add(p1);
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276 Nodeid p2 = secondParent(nid);
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277 if (p2 != null) {
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278 modified = c.add(p2) || modified;
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279 }
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280 }
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281 return modified;
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282 }
171
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283
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284 // XXX alternative (and perhaps more reliable) approach would be to make a copy of allNodes and remove
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285 // nodes, their parents and so on.
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286
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287 // @return ordered collection of all children rooted at supplied nodes. Nodes shall not be descendants of each other!
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288 public List<Nodeid> childrenOf(List<Nodeid> nodes) {
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289 HashSet<Nodeid> parents = new HashSet<Nodeid>();
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290 LinkedHashSet<Nodeid> result = new LinkedHashSet<Nodeid>();
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291 LinkedList<Nodeid> orderedResult = new LinkedList<Nodeid>();
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292 for(Nodeid next : allNodes) {
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293 // i assume allNodes is sorted, hence do not check any parents unless we hit any common known node first
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294 if (nodes.contains(next)) {
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295 parents.add(next);
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296 } else {
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297 if (parents.isEmpty()) {
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298 // didn't scroll up to any known yet
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299 continue;
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300 }
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301 // record each and every node reported after first common known node hit
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302 orderedResult.addLast(next);
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303 if (parents.contains(firstParent(next)) || parents.contains(secondParent(next))) {
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304 result.add(next);
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305 parents.add(next); // to find next's children
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306 }
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307 }
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308 }
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309 // leave only those of interest in ordered sequence
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310 orderedResult.retainAll(result);
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311 return orderedResult;
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312 }
29
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313 }
157
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314
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315 protected static class ContentPipe implements RevlogStream.Inspector, CancelSupport {
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316 private final ByteChannel sink;
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317 private final CancelSupport cancelSupport;
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318 private Exception failure;
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319 private final int offset;
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320
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321 /**
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322 * @param _sink - cannot be <code>null</code>
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323 * @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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324 */
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325 public ContentPipe(ByteChannel _sink, int seekOffset) {
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326 assert _sink != null;
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327 sink = _sink;
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328 cancelSupport = CancelSupport.Factory.get(_sink);
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329 offset = seekOffset;
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330 }
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diff changeset
331
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332 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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333 if (offset > 0) { // save few useless reset/rewind operations
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334 da.seek(offset);
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335 }
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336 }
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diff changeset
337
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diff changeset
338 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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339 try {
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340 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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341 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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342 ByteBuffer buf = ByteBuffer.allocate(512);
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343 progressSupport.start(da.length());
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344 while (!da.isEmpty()) {
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345 cancelSupport.checkCancelled();
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346 da.readBytes(buf);
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347 buf.flip();
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348 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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diff changeset
349 int consumed = sink.write(buf);
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350 // FIXME in fact, bad sink implementation (that consumes no bytes) would result in endless loop. Need to account for this
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351 buf.compact();
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352 progressSupport.worked(consumed);
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353 }
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354 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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355 } catch (IOException ex) {
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356 recordFailure(ex);
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357 } catch (CancelledException ex) {
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358 recordFailure(ex);
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359 } catch (HgException ex) {
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360 recordFailure(ex);
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361 }
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362 }
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363
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364 public void checkCancelled() throws CancelledException {
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365 cancelSupport.checkCancelled();
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366 }
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367
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368 protected void recordFailure(Exception ex) {
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369 assert failure == null;
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370 failure = ex;
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371 }
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372
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373 public void checkFailed() throws HgException, IOException, CancelledException {
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374 if (failure == null) {
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375 return;
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376 }
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377 if (failure instanceof IOException) {
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378 throw (IOException) failure;
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379 }
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380 if (failure instanceof CancelledException) {
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381 throw (CancelledException) failure;
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382 }
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383 if (failure instanceof HgException) {
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384 throw (HgException) failure;
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385 }
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386 throw new HgBadStateException(failure);
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387 }
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388 }
2
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389 }