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annotate src/org/tmatesoft/hg/internal/RevlogStreamWriter.java @ 537:5a455624be4f

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Update javadoc for HgManifest.Inspector and fix erroneous internal API
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 05 Feb 2013 20:06:22 +0100
parents 243202f1bda5
children dd4f6311af52
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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22 import java.io.IOException;
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23 import java.nio.ByteBuffer;
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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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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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39
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40 /*XXX public because HgCloneCommand uses it*/
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41 public static class HeaderWriter implements DataSerializer.DataSource {
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42 private final ByteBuffer header;
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43 private final boolean isInline;
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44 private long offset;
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45 private int length, compressedLength;
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46 private int baseRev, linkRev, p1, p2;
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47 private byte[] nodeid;
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49 public HeaderWriter(boolean inline) {
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50 isInline = inline;
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51 header = ByteBuffer.allocate(REVLOGV1_RECORD_SIZE);
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52 }
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54 public HeaderWriter offset(long offset) {
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55 this.offset = offset;
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56 return this;
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57 }
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58
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59 public int baseRevision() {
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60 return baseRev;
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61 }
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62
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63 public HeaderWriter baseRevision(int baseRevision) {
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64 this.baseRev = baseRevision;
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65 return this;
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66 }
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67
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68 public HeaderWriter length(int len, int compressedLen) {
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69 this.length = len;
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70 this.compressedLength = compressedLen;
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71 return this;
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72 }
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73
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74 public HeaderWriter parents(int parent1, int parent2) {
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75 p1 = parent1;
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76 p2 = parent2;
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77 return this;
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78 }
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80 public HeaderWriter linkRevision(int linkRevision) {
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81 linkRev = linkRevision;
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82 return this;
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83 }
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84
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85 public HeaderWriter nodeid(Nodeid n) {
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86 nodeid = n.toByteArray();
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87 return this;
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88 }
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90 public HeaderWriter nodeid(byte[] nodeidBytes) {
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91 nodeid = nodeidBytes;
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92 return this;
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93 }
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95 public void serialize(DataSerializer out) throws IOException {
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96 header.clear();
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97 if (offset == 0) {
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98 int version = 1 /* RevlogNG */;
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99 if (isInline) {
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100 final int INLINEDATA = 1 << 16; // FIXME extract constant
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101 version |= INLINEDATA;
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102 }
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103 header.putInt(version);
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104 header.putInt(0);
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105 } else {
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106 header.putLong(offset << 16);
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107 }
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108 header.putInt(compressedLength);
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109 header.putInt(length);
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110 header.putInt(baseRev);
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111 header.putInt(linkRev);
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112 header.putInt(p1);
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113 header.putInt(p2);
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114 header.put(nodeid);
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115 // assume 12 bytes left are zeros
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116 out.write(header.array(), 0, header.capacity());
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117
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118 // regardless whether it's inline or separate data,
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119 // offset field always represent cumulative compressedLength
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120 // (while 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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121 offset += compressedLength;
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122 }
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123
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124 public int serializeLength() {
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125 return header.capacity();
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126 }
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127 }
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128
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129 private final DigestHelper dh = new DigestHelper();
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130 private final RevlogCompressor revlogDataZip;
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131
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132
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133 public RevlogStreamWriter(SessionContext ctx, RevlogStream stream) {
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134 revlogDataZip = new RevlogCompressor(ctx);
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135 }
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136
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137 private int lastEntryBase, lastEntryIndex;
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138 private byte[] lastEntryContent;
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139 private Nodeid lastEntryRevision;
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140 private IntMap<Nodeid> revisionCache = new IntMap<Nodeid>(32);
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141
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142 public void addRevision(byte[] content, int linkRevision, int p1, int p2) {
534
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143 int revCount = revlogStream.revisionCount();
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144 lastEntryIndex = revCount == 0 ? NO_REVISION : revCount - 1;
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145 populateLastEntry();
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146 //
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147 PatchGenerator pg = new PatchGenerator();
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148 Patch patch = pg.delta(lastEntryContent, content);
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149 int patchSerializedLength = patch.serializedLength();
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150
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151 final boolean writeComplete = preferCompleteOverPatch(patchSerializedLength, content.length);
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152 DataSerializer.DataSource dataSource = writeComplete ? new DataSerializer.ByteArrayDataSource(content) : patch.new PatchDataSource();
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153 revlogDataZip.reset(dataSource);
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154 final int compressedLen;
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155 final boolean useUncompressedData = preferCompressedOverComplete(revlogDataZip.getCompressedLength(), dataSource.serializeLength());
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156 if (useUncompressedData) {
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157 // compression wasn't too effective,
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158 compressedLen = dataSource.serializeLength() + 1 /*1 byte for 'u' - uncompressed prefix byte*/;
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159 } else {
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160 compressedLen= revlogDataZip.getCompressedLength();
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161 }
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162 //
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163 Nodeid p1Rev = revision(p1);
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164 Nodeid p2Rev = revision(p2);
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165 byte[] revisionNodeidBytes = dh.sha1(p1Rev, p2Rev, content).asBinary();
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166 //
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167
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168 DataSerializer indexFile, dataFile, activeFile;
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169 indexFile = dataFile = activeFile = null;
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170 try {
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171 //
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172 activeFile = indexFile = revlogStream.getIndexStreamWriter();
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173 final boolean isInlineData = revlogStream.isInlineData();
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174 HeaderWriter revlogHeader = new HeaderWriter(isInlineData);
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175 revlogHeader.length(content.length, compressedLen);
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176 revlogHeader.nodeid(revisionNodeidBytes);
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177 revlogHeader.linkRevision(linkRevision);
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178 revlogHeader.parents(p1, p2);
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179 revlogHeader.baseRevision(writeComplete ? lastEntryIndex+1 : lastEntryBase);
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180 //
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181 revlogHeader.serialize(indexFile);
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182
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183 if (isInlineData) {
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184 dataFile = indexFile;
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185 } else {
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186 dataFile = revlogStream.getDataStreamWriter();
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187 }
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188 activeFile = dataFile;
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189 if (useUncompressedData) {
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190 dataFile.writeByte((byte) 'u');
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191 dataSource.serialize(dataFile);
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192 } else {
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193 int actualCompressedLenWritten = revlogDataZip.writeCompressedData(dataFile);
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194 if (actualCompressedLenWritten != compressedLen) {
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195 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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196 }
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197 }
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198
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199 lastEntryContent = content;
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200 lastEntryBase = revlogHeader.baseRevision();
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201 lastEntryIndex++;
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202 lastEntryRevision = Nodeid.fromBinary(revisionNodeidBytes, 0);
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203 revisionCache.put(lastEntryIndex, lastEntryRevision);
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204 } catch (IOException ex) {
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205 String m = String.format("Failed to write revision %d", lastEntryIndex+1, null);
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206 HgInvalidControlFileException t = new HgInvalidControlFileException(m, ex, null);
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207 if (activeFile == dataFile) {
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208 throw revlogStream.initWithDataFile(t);
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209 } else {
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210 throw revlogStream.initWithIndexFile(t);
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211 }
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212 } finally {
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213 indexFile.done();
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214 if (dataFile != null && dataFile != indexFile) {
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215 dataFile.done();
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216 }
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217 }
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218 }
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219
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220 private RevlogStream revlogStream;
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221 private Nodeid revision(int revisionIndex) {
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222 if (revisionIndex == NO_REVISION) {
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223 return Nodeid.NULL;
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224 }
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225 Nodeid n = revisionCache.get(revisionIndex);
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226 if (n == null) {
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227 n = Nodeid.fromBinary(revlogStream.nodeid(revisionIndex), 0);
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228 revisionCache.put(revisionIndex, n);
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229 }
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230 return n;
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231 }
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232
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233 private void populateLastEntry() throws HgInvalidControlFileException {
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234 if (lastEntryIndex != NO_REVISION && lastEntryContent == null) {
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235 assert lastEntryIndex >= 0;
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236 final IOException[] failure = new IOException[1];
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237 revlogStream.iterate(lastEntryIndex, lastEntryIndex, true, new RevlogStream.Inspector() {
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238
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239 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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240 try {
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241 lastEntryBase = baseRevision;
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242 lastEntryRevision = Nodeid.fromBinary(nodeid, 0);
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243 lastEntryContent = data.byteArray();
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244 } catch (IOException ex) {
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245 failure[0] = ex;
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246 }
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247 }
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248 });
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249 if (failure[0] != null) {
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250 String m = String.format("Failed to get content of most recent revision %d", lastEntryIndex);
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251 throw revlogStream.initWithDataFile(new HgInvalidControlFileException(m, failure[0], null));
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252 }
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253 }
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254 }
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255
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256 public static boolean preferCompleteOverPatch(int patchLength, int fullContentLength) {
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257 return !decideWorthEffort(patchLength, fullContentLength);
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258 }
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259
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260 public static boolean preferCompressedOverComplete(int compressedLen, int fullContentLength) {
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261 if (compressedLen <= 0) { // just in case, meaningless otherwise
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262 return false;
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263 }
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264 return decideWorthEffort(compressedLen, fullContentLength);
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265 }
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266
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267 // true if length obtained with effort is worth it
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268 private static boolean decideWorthEffort(int lengthWithExtraEffort, int lengthWithoutEffort) {
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269 return lengthWithExtraEffort < (/* 3/4 of original */lengthWithoutEffort - (lengthWithoutEffort >>> 2));
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270 }
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271 }