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annotate src/org/tmatesoft/hg/internal/RevlogStreamWriter.java @ 538:dd4f6311af52

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Commit: first working version
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 05 Feb 2013 22:30:21 +0100
parents 243202f1bda5
children 9edfd5a223b8
rev   line source
530
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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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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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24
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25 import org.tmatesoft.hg.core.Nodeid;
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26 import org.tmatesoft.hg.core.SessionContext;
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27 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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28 import org.tmatesoft.hg.repo.HgInvalidStateException;
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29
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30 /**
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31 *
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32 * TODO separate operation to check if index is too big and split into index+data
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33 *
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34 * @author Artem Tikhomirov
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35 * @author TMate Software Ltd.
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36 */
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37 public class RevlogStreamWriter {
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38
538
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39 private final DigestHelper dh = new DigestHelper();
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40 private final RevlogCompressor revlogDataZip;
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41 private int lastEntryBase, lastEntryIndex;
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42 private byte[] lastEntryContent;
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43 private Nodeid lastEntryRevision;
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44 private IntMap<Nodeid> revisionCache = new IntMap<Nodeid>(32);
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45 private RevlogStream revlogStream;
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46
538
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47 public RevlogStreamWriter(SessionContext ctx, RevlogStream stream) {
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48 assert ctx != null;
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49 assert stream != null;
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50
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51 revlogDataZip = new RevlogCompressor(ctx);
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52 revlogStream = stream;
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53 }
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54
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55 /**
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56 * @return nodeid of added revision
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57 */
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58 public Nodeid addRevision(byte[] content, int linkRevision, int p1, int p2) {
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59 lastEntryRevision = Nodeid.NULL;
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60 int revCount = revlogStream.revisionCount();
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61 lastEntryIndex = revCount == 0 ? NO_REVISION : revCount - 1;
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62 populateLastEntry();
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63 //
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64 PatchGenerator pg = new PatchGenerator();
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65 Patch patch = pg.delta(lastEntryContent, content);
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66 int patchSerializedLength = patch.serializedLength();
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67
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68 final boolean writeComplete = preferCompleteOverPatch(patchSerializedLength, content.length);
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69 DataSerializer.DataSource dataSource = writeComplete ? new DataSerializer.ByteArrayDataSource(content) : patch.new PatchDataSource();
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70 revlogDataZip.reset(dataSource);
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71 final int compressedLen;
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72 final boolean useCompressedData = preferCompressedOverComplete(revlogDataZip.getCompressedLength(), dataSource.serializeLength());
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73 if (useCompressedData) {
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74 compressedLen= revlogDataZip.getCompressedLength();
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75 } else {
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76 // compression wasn't too effective,
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77 compressedLen = dataSource.serializeLength() + 1 /*1 byte for 'u' - uncompressed prefix byte*/;
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78 }
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79 //
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80 Nodeid p1Rev = revision(p1);
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81 Nodeid p2Rev = revision(p2);
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82 byte[] revisionNodeidBytes = dh.sha1(p1Rev, p2Rev, content).asBinary();
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83 //
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84
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85 DataSerializer indexFile, dataFile, activeFile;
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86 indexFile = dataFile = activeFile = null;
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87 try {
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88 //
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89 activeFile = indexFile = revlogStream.getIndexStreamWriter();
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90 final boolean isInlineData = revlogStream.isInlineData();
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91 HeaderWriter revlogHeader = new HeaderWriter(isInlineData);
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92 revlogHeader.length(content.length, compressedLen);
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93 revlogHeader.nodeid(revisionNodeidBytes);
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94 revlogHeader.linkRevision(linkRevision);
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95 revlogHeader.parents(p1, p2);
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96 revlogHeader.baseRevision(writeComplete ? lastEntryIndex+1 : lastEntryBase);
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97 revlogHeader.offset(revlogStream.newEntryOffset());
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98 //
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99 revlogHeader.serialize(indexFile);
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100
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101 if (isInlineData) {
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102 dataFile = indexFile;
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103 } else {
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104 dataFile = revlogStream.getDataStreamWriter();
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105 }
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106 activeFile = dataFile;
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107 if (useCompressedData) {
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108 int actualCompressedLenWritten = revlogDataZip.writeCompressedData(dataFile);
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109 if (actualCompressedLenWritten != compressedLen) {
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110 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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111 }
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112 } else {
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113 dataFile.writeByte((byte) 'u');
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114 dataSource.serialize(dataFile);
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115 }
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116
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117 lastEntryContent = content;
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118 lastEntryBase = revlogHeader.baseRevision();
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119 lastEntryIndex++;
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120 lastEntryRevision = Nodeid.fromBinary(revisionNodeidBytes, 0);
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121 revisionCache.put(lastEntryIndex, lastEntryRevision);
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122 } catch (IOException ex) {
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123 String m = String.format("Failed to write revision %d", lastEntryIndex+1, null);
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124 HgInvalidControlFileException t = new HgInvalidControlFileException(m, ex, null);
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125 if (activeFile == dataFile) {
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126 throw revlogStream.initWithDataFile(t);
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127 } else {
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128 throw revlogStream.initWithIndexFile(t);
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129 }
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130 } finally {
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131 indexFile.done();
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132 if (dataFile != null && dataFile != indexFile) {
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133 dataFile.done();
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134 }
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135 }
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136 return lastEntryRevision;
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137 }
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138
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139 private Nodeid revision(int revisionIndex) {
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140 if (revisionIndex == NO_REVISION) {
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141 return Nodeid.NULL;
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142 }
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143 Nodeid n = revisionCache.get(revisionIndex);
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144 if (n == null) {
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145 n = Nodeid.fromBinary(revlogStream.nodeid(revisionIndex), 0);
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146 revisionCache.put(revisionIndex, n);
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147 }
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148 return n;
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149 }
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150
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151 private void populateLastEntry() throws HgInvalidControlFileException {
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152 if (lastEntryIndex != NO_REVISION && lastEntryContent == null) {
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153 assert lastEntryIndex >= 0;
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154 final IOException[] failure = new IOException[1];
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155 revlogStream.iterate(lastEntryIndex, lastEntryIndex, true, new RevlogStream.Inspector() {
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156
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157 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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158 try {
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159 lastEntryBase = baseRevision;
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160 lastEntryRevision = Nodeid.fromBinary(nodeid, 0);
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161 lastEntryContent = data.byteArray();
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162 } catch (IOException ex) {
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163 failure[0] = ex;
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164 }
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165 }
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166 });
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167 if (failure[0] != null) {
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168 String m = String.format("Failed to get content of most recent revision %d", lastEntryIndex);
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169 throw revlogStream.initWithDataFile(new HgInvalidControlFileException(m, failure[0], null));
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170 }
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171 }
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172 }
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173
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174 public static boolean preferCompleteOverPatch(int patchLength, int fullContentLength) {
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175 return !decideWorthEffort(patchLength, fullContentLength);
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176 }
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177
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178 public static boolean preferCompressedOverComplete(int compressedLen, int fullContentLength) {
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179 if (compressedLen <= 0) { // just in case, meaningless otherwise
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180 return false;
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181 }
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182 return decideWorthEffort(compressedLen, fullContentLength);
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183 }
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184
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185 // true if length obtained with effort is worth it
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186 private static boolean decideWorthEffort(int lengthWithExtraEffort, int lengthWithoutEffort) {
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187 return lengthWithExtraEffort < (/* 3/4 of original */lengthWithoutEffort - (lengthWithoutEffort >>> 2));
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188 }
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189
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190 /*XXX public because HgCloneCommand uses it*/
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191 public static class HeaderWriter implements DataSerializer.DataSource {
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192 private final ByteBuffer header;
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193 private final boolean isInline;
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194 private long offset;
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195 private int length, compressedLength;
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196 private int baseRev, linkRev, p1, p2;
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197 private byte[] nodeid;
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198
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199 public HeaderWriter(boolean inline) {
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200 isInline = inline;
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201 header = ByteBuffer.allocate(REVLOGV1_RECORD_SIZE);
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202 }
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203
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204 public HeaderWriter offset(long offset) {
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205 this.offset = offset;
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206 return this;
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207 }
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208
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209 public int baseRevision() {
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210 return baseRev;
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211 }
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212
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213 public HeaderWriter baseRevision(int baseRevision) {
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214 this.baseRev = baseRevision;
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215 return this;
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216 }
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217
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218 public HeaderWriter length(int len, int compressedLen) {
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219 this.length = len;
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220 this.compressedLength = compressedLen;
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221 return this;
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222 }
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223
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224 public HeaderWriter parents(int parent1, int parent2) {
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225 p1 = parent1;
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226 p2 = parent2;
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227 return this;
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228 }
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229
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230 public HeaderWriter linkRevision(int linkRevision) {
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231 linkRev = linkRevision;
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232 return this;
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233 }
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234
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235 public HeaderWriter nodeid(Nodeid n) {
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236 nodeid = n.toByteArray();
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237 return this;
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238 }
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239
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240 public HeaderWriter nodeid(byte[] nodeidBytes) {
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241 nodeid = nodeidBytes;
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242 return this;
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243 }
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244
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245 public void serialize(DataSerializer out) throws IOException {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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246 header.clear();
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
247 if (offset == 0) {
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
248 int version = 1 /* RevlogNG */;
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
249 if (isInline) {
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
250 final int INLINEDATA = 1 << 16; // FIXME extract constant
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
251 version |= INLINEDATA;
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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252 }
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
253 header.putInt(version);
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
254 header.putInt(0);
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
255 } else {
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
256 header.putLong(offset << 16);
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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257 }
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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258 header.putInt(compressedLength);
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
259 header.putInt(length);
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
260 header.putInt(baseRev);
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
261 header.putInt(linkRev);
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
262 header.putInt(p1);
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
263 header.putInt(p2);
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243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
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parents: 533
diff changeset
264 header.put(nodeid);
530
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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265 // assume 12 bytes left are zeros
534
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
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parents: 533
diff changeset
266 out.write(header.array(), 0, header.capacity());
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0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
267
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
268 // regardless whether it's inline or separate data,
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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269 // offset field always represent cumulative compressedLength
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
270 // (while offset in the index file with inline==true differs by n*sizeof(header), where n is entry's position in the file)
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
271 offset += compressedLength;
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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272 }
534
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
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parents: 533
diff changeset
273
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 533
diff changeset
274 public int serializeLength() {
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 533
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275 return header.capacity();
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 533
diff changeset
276 }
243202f1bda5 Commit: refactor revision creation code from clone command to work separately, fit into existing library structure
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents: 533
diff changeset
277 }
530
0f6fa88e2162 Towards commit command: refactor clone, extract pieces to reuse. Describe a defect discovered when bundle has few patches with 0,0 parents
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
278 }