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annotate src/org/tmatesoft/hg/internal/RevlogStreamWriter.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents e1b29756f901
children 7c0d2ce340b8
rev   line source
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1 /*
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2 * Copyright (c) 2013 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.internal;
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19 import static org.tmatesoft.hg.internal.Internals.REVLOGV1_RECORD_SIZE;
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20 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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21
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22 import java.io.File;
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23 import java.io.IOException;
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24 import java.nio.ByteBuffer;
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25
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26 import org.tmatesoft.hg.core.HgIOException;
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27 import org.tmatesoft.hg.core.Nodeid;
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28 import org.tmatesoft.hg.core.SessionContext;
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29 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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30 import org.tmatesoft.hg.repo.HgInvalidStateException;
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32 /**
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33 *
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34 * TODO [post-1.1] separate operation to check if index is too big and split into index+data
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35 *
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36 * @author Artem Tikhomirov
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37 * @author TMate Software Ltd.
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38 */
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39 public class RevlogStreamWriter {
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40
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41 private final DigestHelper dh = new DigestHelper();
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42 private final RevlogCompressor revlogDataZip;
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43 private final Transaction transaction;
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44 private int lastEntryBase, lastEntryIndex;
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45 private byte[] lastEntryContent;
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46 private Nodeid lastEntryRevision;
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47 private IntMap<Nodeid> revisionCache = new IntMap<Nodeid>(32);
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48 private RevlogStream revlogStream;
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49
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50 public RevlogStreamWriter(SessionContext.Source ctxSource, RevlogStream stream, Transaction tr) {
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51 assert ctxSource != null;
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52 assert stream != null;
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53 assert tr != null;
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54
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55 revlogDataZip = new RevlogCompressor(ctxSource.getSessionContext());
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56 revlogStream = stream;
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57 transaction = tr;
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58 }
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59
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60 /**
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61 * @return nodeid of added revision
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62 */
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63 public Nodeid addRevision(byte[] content, int linkRevision, int p1, int p2) throws HgIOException {
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64 lastEntryRevision = Nodeid.NULL;
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65 int revCount = revlogStream.revisionCount();
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66 lastEntryIndex = revCount == 0 ? NO_REVISION : revCount - 1;
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67 populateLastEntry();
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68 //
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69 Patch patch = GeneratePatchInspector.delta(lastEntryContent, content);
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70 int patchSerializedLength = patch.serializedLength();
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71
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72 final boolean writeComplete = preferCompleteOverPatch(patchSerializedLength, content.length);
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73 DataSerializer.DataSource dataSource = writeComplete ? new DataSerializer.ByteArrayDataSource(content) : patch.new PatchDataSource();
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74 revlogDataZip.reset(dataSource);
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75 final int compressedLen;
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76 final boolean useCompressedData = preferCompressedOverComplete(revlogDataZip.getCompressedLength(), dataSource.serializeLength());
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77 if (useCompressedData) {
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78 compressedLen= revlogDataZip.getCompressedLength();
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79 } else {
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80 // compression wasn't too effective,
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81 compressedLen = dataSource.serializeLength() + 1 /*1 byte for 'u' - uncompressed prefix byte*/;
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82 }
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83 //
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84 Nodeid p1Rev = revision(p1);
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85 Nodeid p2Rev = revision(p2);
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86 byte[] revisionNodeidBytes = dh.sha1(p1Rev, p2Rev, content).asBinary();
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87 //
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88
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89 DataSerializer indexFile, dataFile, activeFile;
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90 indexFile = dataFile = activeFile = null;
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91 try {
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92 //
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93 activeFile = indexFile = revlogStream.getIndexStreamWriter(transaction);
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94 final boolean isInlineData = revlogStream.isInlineData();
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95 HeaderWriter revlogHeader = new HeaderWriter(isInlineData);
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96 revlogHeader.length(content.length, compressedLen);
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97 revlogHeader.nodeid(revisionNodeidBytes);
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98 revlogHeader.linkRevision(linkRevision);
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99 revlogHeader.parents(p1, p2);
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100 revlogHeader.baseRevision(writeComplete ? lastEntryIndex+1 : lastEntryBase);
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101 long lastEntryOffset = revlogStream.newEntryOffset();
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102 revlogHeader.offset(lastEntryOffset);
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103 //
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104 revlogHeader.serialize(indexFile);
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105
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106 if (isInlineData) {
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107 dataFile = indexFile;
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108 } else {
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109 dataFile = revlogStream.getDataStreamWriter(transaction);
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110 }
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111 activeFile = dataFile;
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112 if (useCompressedData) {
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113 int actualCompressedLenWritten = revlogDataZip.writeCompressedData(dataFile);
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114 if (actualCompressedLenWritten != compressedLen) {
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115 throw new HgInvalidStateException(String.format("Expected %d bytes of compressed data, but actually wrote %d in %s", compressedLen, actualCompressedLenWritten, revlogStream.getDataFileName()));
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116 }
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117 } else {
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118 dataFile.writeByte((byte) 'u');
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119 dataSource.serialize(dataFile);
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120 }
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121
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122
538
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123 lastEntryContent = content;
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124 lastEntryBase = revlogHeader.baseRevision();
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125 lastEntryIndex++;
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126 lastEntryRevision = Nodeid.fromBinary(revisionNodeidBytes, 0);
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127 revisionCache.put(lastEntryIndex, lastEntryRevision);
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128
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129 revlogStream.revisionAdded(lastEntryIndex, lastEntryRevision, lastEntryBase, lastEntryOffset);
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130 } catch (IOException ex) {
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131 String m = String.format("Failed to write revision %d", lastEntryIndex+1, null);
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132 // FIXME proper file in the exception based on activeFile == dataFile || indexFile
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133 throw new HgIOException(m, ex, new File(revlogStream.getDataFileName()));
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134 } finally {
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135 indexFile.done();
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136 if (dataFile != null && dataFile != indexFile) {
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137 dataFile.done();
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138 }
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139 }
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140 return lastEntryRevision;
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141 }
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142
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143 private Nodeid revision(int revisionIndex) {
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144 if (revisionIndex == NO_REVISION) {
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145 return Nodeid.NULL;
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146 }
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147 Nodeid n = revisionCache.get(revisionIndex);
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148 if (n == null) {
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149 n = Nodeid.fromBinary(revlogStream.nodeid(revisionIndex), 0);
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150 revisionCache.put(revisionIndex, n);
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151 }
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152 return n;
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153 }
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154
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155 private void populateLastEntry() throws HgInvalidControlFileException {
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156 if (lastEntryContent != null) {
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157 return;
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158 }
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159 if (lastEntryIndex != NO_REVISION) {
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160 assert lastEntryIndex >= 0;
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161 final IOException[] failure = new IOException[1];
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162 revlogStream.iterate(lastEntryIndex, lastEntryIndex, true, new RevlogStream.Inspector() {
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163
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164 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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165 try {
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166 lastEntryBase = baseRevision;
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167 lastEntryRevision = Nodeid.fromBinary(nodeid, 0);
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168 lastEntryContent = data.byteArray();
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169 } catch (IOException ex) {
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170 failure[0] = ex;
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171 }
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172 }
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173 });
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174 if (failure[0] != null) {
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175 String m = String.format("Failed to get content of most recent revision %d", lastEntryIndex);
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176 throw revlogStream.initWithDataFile(new HgInvalidControlFileException(m, failure[0], null));
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177 }
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178 } else {
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179 lastEntryContent = new byte[0];
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180 }
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181 }
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182
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183 public static boolean preferCompleteOverPatch(int patchLength, int fullContentLength) {
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184 return !decideWorthEffort(patchLength, fullContentLength);
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185 }
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186
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187 public static boolean preferCompressedOverComplete(int compressedLen, int fullContentLength) {
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188 if (compressedLen <= 0) { // just in case, meaningless otherwise
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189 return false;
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190 }
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191 return decideWorthEffort(compressedLen, fullContentLength);
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192 }
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193
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194 // true if length obtained with effort is worth it
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195 private static boolean decideWorthEffort(int lengthWithExtraEffort, int lengthWithoutEffort) {
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196 return lengthWithExtraEffort < (/* 3/4 of original */lengthWithoutEffort - (lengthWithoutEffort >>> 2));
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197 }
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198
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199 /*XXX public because HgCloneCommand uses it*/
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200 public static class HeaderWriter implements DataSerializer.DataSource {
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201 private final ByteBuffer header;
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202 private final boolean isInline;
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203 private long offset;
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204 private int length, compressedLength;
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205 private int baseRev, linkRev, p1, p2;
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206 private byte[] nodeid;
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207
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208 public HeaderWriter(boolean inline) {
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209 isInline = inline;
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210 header = ByteBuffer.allocate(REVLOGV1_RECORD_SIZE);
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211 }
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212
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213 public HeaderWriter offset(long offset) {
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214 this.offset = offset;
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215 return this;
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216 }
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217
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218 public int baseRevision() {
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219 return baseRev;
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220 }
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221
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222 public HeaderWriter baseRevision(int baseRevision) {
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223 this.baseRev = baseRevision;
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224 return this;
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225 }
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226
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227 public HeaderWriter length(int len, int compressedLen) {
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228 this.length = len;
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229 this.compressedLength = compressedLen;
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230 return this;
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231 }
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232
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233 public HeaderWriter parents(int parent1, int parent2) {
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234 p1 = parent1;
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235 p2 = parent2;
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236 return this;
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237 }
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238
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239 public HeaderWriter linkRevision(int linkRevision) {
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240 linkRev = linkRevision;
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241 return this;
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242 }
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243
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244 public HeaderWriter nodeid(Nodeid n) {
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245 nodeid = n.toByteArray();
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246 return this;
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247 }
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248
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249 public HeaderWriter nodeid(byte[] nodeidBytes) {
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250 nodeid = nodeidBytes;
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251 return this;
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252 }
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253
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254 public void serialize(DataSerializer out) throws IOException {
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255 header.clear();
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256 if (offset == 0) {
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257 int version = 1 /* RevlogNG */;
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258 if (isInline) {
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259 version |= RevlogStream.INLINEDATA;
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260 }
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261 header.putInt(version);
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262 header.putInt(0);
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263 } else {
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264 header.putLong(offset << 16);
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265 }
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266 header.putInt(compressedLength);
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267 header.putInt(length);
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268 header.putInt(baseRev);
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269 header.putInt(linkRev);
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270 header.putInt(p1);
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271 header.putInt(p2);
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272 header.put(nodeid);
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273 // assume 12 bytes left are zeros
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274 out.write(header.array(), 0, header.capacity());
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275
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276 // regardless whether it's inline or separate data,
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277 // offset field always represent cumulative compressedLength
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278 // (while physical offset in the index file with inline==true differs by n*sizeof(header), where n is entry's position in the file)
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279 offset += compressedLength;
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280 }
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281
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282 public int serializeLength() {
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283 return header.capacity();
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284 }
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285 }
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286 }