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annotate src/org/tmatesoft/hg/repo/Revlog.java @ 191:b777502a06f5

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Do not assume second parent can be set only when first one is set, again
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 14 Apr 2011 19:53:31 +0200
parents 9807bf8f3a9c
children e5407b5a586a
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) {
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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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216
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diff changeset
217 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
29
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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) {
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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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232 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]);
183
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233 }
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234 if (parent2Revision != -1) { // revlog of DataAccess.java has p2 set when p1 is -1
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235 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]);
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236 }
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237 }
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238 };
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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);
191
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276 }
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277 Nodeid p2 = secondParent(nid);
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278 if (p2 != null) {
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279 modified = c.add(p2) || modified;
29
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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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337
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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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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 }