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annotate src/org/tmatesoft/hg/repo/Revlog.java @ 164:d51f1c6aaa28

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author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Thu, 10 Mar 2011 04:46:34 +0100
parents d5268ca7715b
children 2c3e96674e2a
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.Collections;
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27 import java.util.HashMap;
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28 import java.util.LinkedHashSet;
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29 import java.util.Map;
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30 import java.util.Set;
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32 import org.tmatesoft.hg.core.HgBadStateException;
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33 import org.tmatesoft.hg.core.HgException;
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34 import org.tmatesoft.hg.core.Nodeid;
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35 import org.tmatesoft.hg.internal.DataAccess;
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36 import org.tmatesoft.hg.internal.RevlogStream;
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37 import org.tmatesoft.hg.util.ByteChannel;
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38 import org.tmatesoft.hg.util.CancelSupport;
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39 import org.tmatesoft.hg.util.CancelledException;
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40 import org.tmatesoft.hg.util.ProgressSupport;
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42
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43 /**
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44 * Base class for all Mercurial entities that are serialized in a so called revlog format (changelog, manifest, data files).
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45 *
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46 * Implementation note:
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47 * Hides actual actual revlog stream implementation and its access methods (i.e. RevlogStream.Inspector), iow shall not expose anything internal
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48 * in public methods.
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49 *
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50 * @author Artem Tikhomirov
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51 * @author TMate Software Ltd.
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52 */
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53 abstract class Revlog {
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54
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55 private final HgRepository repo;
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56 protected final RevlogStream content;
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58 protected Revlog(HgRepository hgRepo, RevlogStream contentStream) {
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59 if (hgRepo == null) {
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60 throw new IllegalArgumentException();
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61 }
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62 if (contentStream == null) {
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63 throw new IllegalArgumentException();
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64 }
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65 repo = hgRepo;
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66 content = contentStream;
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67 }
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69 // invalid Revlog
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70 protected Revlog(HgRepository hgRepo) {
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71 repo = hgRepo;
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72 content = null;
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73 }
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75 public final HgRepository getRepo() {
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76 return repo;
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77 }
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79 public final int getRevisionCount() {
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80 return content.revisionCount();
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81 }
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83 public final int getLastRevision() {
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84 return content.revisionCount() - 1;
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85 }
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86
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87 public final Nodeid getRevision(int revision) {
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88 // XXX cache nodeids?
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89 return Nodeid.fromBinary(content.nodeid(revision), 0);
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90 }
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92 public final int getLocalRevision(Nodeid nid) {
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93 int revision = content.findLocalRevisionNumber(nid);
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94 if (revision == BAD_REVISION) {
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95 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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96 }
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97 return revision;
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98 }
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99
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100 // Till now, i follow approach that NULL nodeid is never part of revlog
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101 public final boolean isKnown(Nodeid nodeid) {
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102 final int rn = content.findLocalRevisionNumber(nodeid);
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103 if (Integer.MIN_VALUE == rn) {
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104 return false;
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105 }
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106 if (rn < 0 || rn >= content.revisionCount()) {
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107 // Sanity check
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108 throw new IllegalStateException();
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109 }
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110 return true;
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111 }
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112
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113 /**
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114 * 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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115 * @param nodeid
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116 */
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117 protected void rawContent(Nodeid nodeid, ByteChannel sink) throws HgException, IOException, CancelledException {
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118 rawContent(getLocalRevision(nodeid), sink);
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119 }
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120
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121 /**
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122 * @param revision - repo-local index of this file change (not a changelog revision number!)
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123 */
157
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124 protected void rawContent(int revision, ByteChannel sink) throws HgException, IOException, CancelledException {
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125 if (sink == null) {
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126 throw new IllegalArgumentException();
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127 }
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128 ContentPipe insp = new ContentPipe(sink, 0);
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129 insp.checkCancelled();
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130 content.iterate(revision, revision, true, insp);
157
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131 insp.checkFailed();
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132 }
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133
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134 /**
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135 * XXX perhaps, return value Nodeid[2] and boolean needNodeids is better (and higher level) API for this query?
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136 *
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137 * @param revision - revision to query parents, or {@link HgRepository#TIP}
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138 * @param parentRevisions - int[2] to get local revision numbers of parents (e.g. {6, -1})
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139 * @param parent1 - byte[20] or null, if parent's nodeid is not needed
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140 * @param parent2 - byte[20] or null, if second parent's nodeid is not needed
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141 * @return
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142 */
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143 public void parents(int revision, int[] parentRevisions, byte[] parent1, byte[] parent2) {
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144 if (revision != TIP && !(revision >= 0 && revision < content.revisionCount())) {
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145 throw new IllegalArgumentException(String.valueOf(revision));
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146 }
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147 if (parentRevisions == null || parentRevisions.length < 2) {
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148 throw new IllegalArgumentException(String.valueOf(parentRevisions));
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149 }
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150 if (parent1 != null && parent1.length < 20) {
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151 throw new IllegalArgumentException(parent1.toString());
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152 }
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153 if (parent2 != null && parent2.length < 20) {
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154 throw new IllegalArgumentException(parent2.toString());
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155 }
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156 class ParentCollector implements RevlogStream.Inspector {
56
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157 public int p1 = -1;
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158 public int p2 = -1;
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159 public byte[] nodeid;
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160
157
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161 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
56
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162 p1 = parent1Revision;
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163 p2 = parent2Revision;
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164 this.nodeid = new byte[20];
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165 // nodeid arg now comes in 32 byte from (as in file format description), however upper 12 bytes are zeros.
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166 System.arraycopy(nodeid, nodeid.length > 20 ? nodeid.length - 20 : 0, this.nodeid, 0, 20);
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167 }
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168 };
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169 ParentCollector pc = new ParentCollector();
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170 content.iterate(revision, revision, false, pc);
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171 parentRevisions[0] = pc.p1;
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172 parentRevisions[1] = pc.p2;
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173 if (parent1 != null) {
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174 if (parentRevisions[0] == -1) {
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175 Arrays.fill(parent1, 0, 20, (byte) 0);
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176 } else {
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177 content.iterate(parentRevisions[0], parentRevisions[0], false, pc);
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178 System.arraycopy(pc.nodeid, 0, parent1, 0, 20);
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179 }
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180 }
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181 if (parent2 != null) {
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182 if (parentRevisions[1] == -1) {
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183 Arrays.fill(parent2, 0, 20, (byte) 0);
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184 } else {
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185 content.iterate(parentRevisions[1], parentRevisions[1], false, pc);
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186 System.arraycopy(pc.nodeid, 0, parent2, 0, 20);
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187 }
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188 }
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189 }
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190
29
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191 /*
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192 * XXX think over if it's better to do either:
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193 * pw = getChangelog().new ParentWalker(); pw.init() and pass pw instance around as needed
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194 * or
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195 * add Revlog#getParentWalker(), static class, make cons() and #init package-local, and keep SoftReference to allow walker reuse.
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196 *
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197 * and yes, walker is not a proper name
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198 */
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199 public final class ParentWalker {
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200 private Map<Nodeid, Nodeid> firstParent;
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201 private Map<Nodeid, Nodeid> secondParent;
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202 private Set<Nodeid> allNodes;
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203
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204 public ParentWalker() {
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205 firstParent = secondParent = Collections.emptyMap();
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206 allNodes = Collections.emptySet();
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207 }
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208
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209 public void init() {
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210 final RevlogStream stream = Revlog.this.content;
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211 final int revisionCount = stream.revisionCount();
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212 firstParent = new HashMap<Nodeid, Nodeid>(revisionCount);
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213 secondParent = new HashMap<Nodeid, Nodeid>(firstParent.size() >> 1); // assume branches/merges are less frequent
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214 allNodes = new LinkedHashSet<Nodeid>();
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215
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diff changeset
216 RevlogStream.Inspector insp = new RevlogStream.Inspector() {
29
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217 final Nodeid[] sequentialRevisionNodeids = new Nodeid[revisionCount];
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218 int ix = 0;
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219 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
29
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220 if (ix != revisionNumber) {
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221 // XXX temp code, just to make sure I understand what's going on here
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222 throw new IllegalStateException();
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223 }
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224 if (parent1Revision >= revisionNumber || parent2Revision >= revisionNumber) {
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225 throw new IllegalStateException(); // sanity, revisions are sequential
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226 }
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227 final Nodeid nid = new Nodeid(nodeid, true);
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228 sequentialRevisionNodeids[ix++] = nid;
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229 allNodes.add(nid);
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230 if (parent1Revision != -1) {
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diff changeset
231 firstParent.put(nid, sequentialRevisionNodeids[parent1Revision]);
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diff changeset
232 if (parent2Revision != -1) {
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diff changeset
233 secondParent.put(nid, sequentialRevisionNodeids[parent2Revision]);
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diff changeset
234 }
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235 }
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236 }
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237 };
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diff changeset
238 stream.iterate(0, -1, false, insp);
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diff changeset
239 }
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diff changeset
240
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diff changeset
241 public Set<Nodeid> allNodes() {
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242 return Collections.unmodifiableSet(allNodes);
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243 }
31
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244
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245 // FIXME need to decide whether Nodeid(00 * 20) is always known or not
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246 public boolean knownNode(Nodeid nid) {
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247 return allNodes.contains(nid);
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248 }
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249
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250 // null if none
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251 public Nodeid firstParent(Nodeid nid) {
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252 return firstParent.get(nid);
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253 }
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254
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255 // never null, Nodeid.NULL if none known
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256 public Nodeid safeFirstParent(Nodeid nid) {
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257 Nodeid rv = firstParent(nid);
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258 return rv == null ? Nodeid.NULL : rv;
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259 }
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260
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261 public Nodeid secondParent(Nodeid nid) {
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262 return secondParent.get(nid);
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263 }
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264
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265 public Nodeid safeSecondParent(Nodeid nid) {
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266 Nodeid rv = secondParent(nid);
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267 return rv == null ? Nodeid.NULL : rv;
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268 }
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269
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270 public boolean appendParentsOf(Nodeid nid, Collection<Nodeid> c) {
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271 Nodeid p1 = firstParent(nid);
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272 boolean modified = false;
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273 if (p1 != null) {
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274 modified = c.add(p1);
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275 Nodeid p2 = secondParent(nid);
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276 if (p2 != null) {
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277 modified = c.add(p2) || modified;
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278 }
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279 }
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280 return modified;
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281 }
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282 }
157
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283
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284 protected static class ContentPipe implements RevlogStream.Inspector, CancelSupport {
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285 private final ByteChannel sink;
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286 private final CancelSupport cancelSupport;
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287 private Exception failure;
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288 private final int offset;
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289
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290 /**
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291 * @param _sink - cannot be <code>null</code>
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292 * @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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293 */
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294 public ContentPipe(ByteChannel _sink, int seekOffset) {
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295 assert _sink != null;
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296 sink = _sink;
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297 cancelSupport = CancelSupport.Factory.get(_sink);
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298 offset = seekOffset;
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299 }
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300
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301 protected void prepare(int revisionNumber, DataAccess da) throws HgException, IOException {
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302 if (offset > 0) { // save few useless reset/rewind operations
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303 da.seek(offset);
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304 }
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305 }
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306
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307 public void next(int revisionNumber, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess da) {
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308 try {
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309 prepare(revisionNumber, da); // XXX perhaps, prepare shall return DA (sliced, if needed)
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310 final ProgressSupport progressSupport = ProgressSupport.Factory.get(sink);
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311 ByteBuffer buf = ByteBuffer.allocate(512);
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312 progressSupport.start(da.length());
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313 while (!da.isEmpty()) {
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314 cancelSupport.checkCancelled();
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315 da.readBytes(buf);
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316 buf.flip();
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317 // XXX I may not rely on returned number of bytes but track change in buf position instead.
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318 int consumed = sink.write(buf);
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319 // FIXME in fact, bad sink implementation (that consumes no bytes) would result in endless loop. Need to account for this
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320 buf.compact();
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321 progressSupport.worked(consumed);
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322 }
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323 progressSupport.done(); // XXX shall specify whether #done() is invoked always or only if completed successfully.
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324 } catch (IOException ex) {
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325 recordFailure(ex);
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326 } catch (CancelledException ex) {
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327 recordFailure(ex);
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328 } catch (HgException ex) {
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329 recordFailure(ex);
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330 }
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331 }
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332
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333 public void checkCancelled() throws CancelledException {
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334 cancelSupport.checkCancelled();
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335 }
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336
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337 protected void recordFailure(Exception ex) {
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338 assert failure == null;
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339 failure = ex;
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340 }
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341
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342 public void checkFailed() throws HgException, IOException, CancelledException {
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343 if (failure == null) {
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344 return;
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345 }
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346 if (failure instanceof IOException) {
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347 throw (IOException) failure;
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348 }
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349 if (failure instanceof CancelledException) {
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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350 throw (CancelledException) failure;
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351 }
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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352 if (failure instanceof HgException) {
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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parents: 51 135
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353 throw (HgException) failure;
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parents: 51 135
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354 }
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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parents: 51 135
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355 throw new HgBadStateException(failure);
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parents: 51 135
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356 }
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parents: 51 135
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357 }
2
08db726a0fb7 Shaping out low-level Hg structures
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358 }