annotate src/org/tmatesoft/hg/internal/RevlogStreamWriter.java @ 678:8625cba0a5a8

Towards better blame of merge revisions: refactor merge handling strategy
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Jul 2013 15:36:29 +0200
parents 545b1d4cc11d
children 4ffc17c0b534
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.BAD_REVISION;
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21 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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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.internal.DataSerializer.ByteArrayDataSource;
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30 import org.tmatesoft.hg.internal.DataSerializer.ByteArraySerializer;
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31 import org.tmatesoft.hg.internal.DataSerializer.DataSource;
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32 import org.tmatesoft.hg.repo.HgBundle.GroupElement;
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33 import org.tmatesoft.hg.repo.HgInternals;
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34 import org.tmatesoft.hg.repo.HgInvalidControlFileException;
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35 import org.tmatesoft.hg.repo.HgInvalidDataFormatException;
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36 import org.tmatesoft.hg.repo.HgInvalidRevisionException;
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37 import org.tmatesoft.hg.repo.HgInvalidStateException;
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38 import org.tmatesoft.hg.repo.HgRepository;
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39 import org.tmatesoft.hg.repo.HgRuntimeException;
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40 import org.tmatesoft.hg.util.Pair;
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42 /**
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43 *
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44 * TODO [post-1.1] separate operation to check if index is too big and split into index+data
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45 *
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46 * @author Artem Tikhomirov
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47 * @author TMate Software Ltd.
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48 */
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49 public class RevlogStreamWriter {
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50
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51 private final DigestHelper dh = new DigestHelper();
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52 private final RevlogCompressor revlogDataZip;
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53 private final Transaction transaction;
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54 // init with illegal values
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55 private int lastEntryBase = BAD_REVISION, lastEntryIndex = BAD_REVISION, lastEntryActualLen = -1;
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56 // record revision and its full content
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57 // the name might be misleading, it does not necessarily match lastEntryIndex
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58 private Pair<Integer, byte[]> lastFullContent;
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59 private Nodeid lastEntryRevision;
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60 private IntMap<Nodeid> revisionCache = new IntMap<Nodeid>(32);
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61 private RevlogStream revlogStream;
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62
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63 public RevlogStreamWriter(SessionContext.Source ctxSource, RevlogStream stream, Transaction tr) {
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64 assert ctxSource != null;
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65 assert stream != null;
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66 assert tr != null;
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67
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68 revlogDataZip = new RevlogCompressor(ctxSource.getSessionContext());
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69 revlogStream = stream;
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70 transaction = tr;
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71 }
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72
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73 public RevlogStream getRevlogStream() {
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74 return revlogStream;
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75 }
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76
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77 public Pair<Integer,Nodeid> addPatchRevision(GroupElement ge, RevisionToIndexMap clogRevs, RevisionToIndexMap revlogRevs) throws HgIOException, HgRuntimeException {
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78 populateLastEntryIndex();
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79 //
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80 final Nodeid nodeRev = ge.node();
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81 final Nodeid csetRev = ge.cset();
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82 int linkRev;
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83 if (nodeRev.equals(csetRev)) {
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84 linkRev = lastEntryIndex+1;
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85 } else {
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86 linkRev = clogRevs.revisionIndex(csetRev);
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87 }
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88 assert linkRev >= 0;
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89 final Nodeid p1Rev = ge.firstParent();
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90 int p1 = p1Rev.isNull() ? NO_REVISION : revlogRevs.revisionIndex(p1Rev);
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91 final Nodeid p2Rev = ge.secondParent();
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92 int p2 = p2Rev.isNull() ? NO_REVISION : revlogRevs.revisionIndex(p2Rev);
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93 Patch p = null;
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94 try {
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95 p = HgInternals.patchFromData(ge);
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96 } catch (IOException ex) {
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97 throw new HgIOException("Failed to read patch information", ex, null);
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98 }
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99 //
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100 final Nodeid patchBase = ge.patchBase();
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101 int patchBaseRev = patchBase.isNull() ? NO_REVISION : revlogRevs.revisionIndex(patchBase);
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102 int baseRev = lastEntryIndex == NO_REVISION ? 0 : revlogStream.baseRevision(patchBaseRev);
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103 int revLen;
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104 DataSource ds;
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105 byte[] complete = null;
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106 if (patchBaseRev == lastEntryIndex && lastEntryIndex != NO_REVISION) {
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107 // we may write patch from GroupElement as is
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108 int patchBaseLen = dataLength(patchBaseRev);
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109 revLen = patchBaseLen + p.patchSizeDelta();
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110 ds = p.new PatchDataSource();
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111 } else {
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112 // read baseRev, unless it's the pull to empty repository
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113 try {
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114 if (lastEntryIndex == NO_REVISION) {
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115 complete = p.apply(new ByteArrayDataAccess(new byte[0]), -1);
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116 baseRev = 0; // it's done above, but doesn't hurt
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117 } else {
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118 assert patchBaseRev != NO_REVISION;
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119 ReadContentInspector insp = new ReadContentInspector().read(revlogStream, patchBaseRev);
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120 complete = p.apply(new ByteArrayDataAccess(insp.content), -1);
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121 baseRev = lastEntryIndex + 1;
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122 }
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123 ds = new ByteArrayDataSource(complete);
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124 revLen = complete.length;
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125 } catch (IOException ex) {
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126 // unlikely to happen, as ByteArrayDataSource throws IOException only in case of programming errors
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127 // hence, throwing rt exception here makes more sense here than HgIOException (even that latter is in throws)
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128 throw new HgInvalidDataFormatException("Failed to reconstruct revision", ex);
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129 }
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130 }
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131 doAdd(nodeRev, p1, p2, linkRev, baseRev, revLen, ds);
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132 if (complete != null) {
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133 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, complete);
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134 }
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135 return new Pair<Integer, Nodeid>(lastEntryIndex, lastEntryRevision);
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136 }
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137
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138 /**
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139 * @return nodeid of added revision
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140 * @throws HgRuntimeException
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141 */
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142 public Pair<Integer,Nodeid> addRevision(DataSource content, int linkRevision, int p1, int p2) throws HgIOException, HgRuntimeException {
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143 populateLastEntryIndex();
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144 populateLastEntryContent();
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145 //
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146 byte[] contentByteArray = toByteArray(content);
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147 Patch patch = GeneratePatchInspector.delta(lastFullContent.second(), contentByteArray);
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148 int patchSerializedLength = patch.serializedLength();
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149
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150 final boolean writeComplete = preferCompleteOverPatch(patchSerializedLength, contentByteArray.length);
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151 DataSerializer.DataSource dataSource = writeComplete ? new ByteArrayDataSource(contentByteArray) : patch.new PatchDataSource();
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152 //
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153 Nodeid p1Rev = revision(p1);
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154 Nodeid p2Rev = revision(p2);
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155 Nodeid newRev = Nodeid.fromBinary(dh.sha1(p1Rev, p2Rev, contentByteArray).asBinary(), 0);
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156 doAdd(newRev, p1, p2, linkRevision, writeComplete ? lastEntryIndex+1 : lastEntryBase, contentByteArray.length, dataSource);
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157 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, contentByteArray);
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158 return new Pair<Integer, Nodeid>(lastEntryIndex, lastEntryRevision);
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159 }
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160
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161 private Nodeid doAdd(Nodeid rev, int p1, int p2, int linkRevision, int baseRevision, int revLen, DataSerializer.DataSource dataSource) throws HgIOException, HgRuntimeException {
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162 assert linkRevision >= 0;
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163 assert baseRevision >= 0;
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164 assert p1 == NO_REVISION || p1 >= 0;
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165 assert p2 == NO_REVISION || p2 >= 0;
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166 assert !rev.isNull();
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167 assert revLen >= 0;
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168 revlogDataZip.reset(dataSource);
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169 final int compressedLen;
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170 final boolean useCompressedData = preferCompressedOverComplete(revlogDataZip.getCompressedLength(), dataSource.serializeLength());
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171 if (useCompressedData) {
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172 compressedLen= revlogDataZip.getCompressedLength();
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173 } else {
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174 // compression wasn't too effective,
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175 compressedLen = dataSource.serializeLength() + 1 /*1 byte for 'u' - uncompressed prefix byte*/;
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176 }
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177 //
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178 DataSerializer indexFile, dataFile;
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179 indexFile = dataFile = null;
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180 try {
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181 // FIXME perhaps, not a good idea to open stream for each revision added (e.g, when we pull a lot of them)
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182 indexFile = revlogStream.getIndexStreamWriter(transaction);
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183 final boolean isInlineData = revlogStream.isInlineData();
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184 HeaderWriter revlogHeader = new HeaderWriter(isInlineData);
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185 revlogHeader.length(revLen, compressedLen);
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186 revlogHeader.nodeid(rev.toByteArray());
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187 revlogHeader.linkRevision(linkRevision);
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188 revlogHeader.parents(p1, p2);
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189 revlogHeader.baseRevision(baseRevision);
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190 long lastEntryOffset = revlogStream.newEntryOffset();
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191 revlogHeader.offset(lastEntryOffset);
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192 //
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193 revlogHeader.serialize(indexFile);
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194
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195 if (isInlineData) {
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196 dataFile = indexFile;
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197 } else {
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198 dataFile = revlogStream.getDataStreamWriter(transaction);
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199 }
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200 if (useCompressedData) {
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201 int actualCompressedLenWritten = revlogDataZip.writeCompressedData(dataFile);
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202 if (actualCompressedLenWritten != compressedLen) {
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203 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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204 }
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205 } else {
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206 dataFile.writeByte((byte) 'u');
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207 dataSource.serialize(dataFile);
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208 }
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209
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210 lastEntryBase = revlogHeader.baseRevision();
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211 lastEntryIndex++;
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212 lastEntryActualLen = revLen;
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213 lastEntryRevision = rev;
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214 revisionCache.put(lastEntryIndex, lastEntryRevision);
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215
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216 revlogStream.revisionAdded(lastEntryIndex, lastEntryRevision, lastEntryBase, lastEntryOffset);
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217 } finally {
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218 indexFile.done();
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219 if (dataFile != null && dataFile != indexFile) {
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220 dataFile.done();
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221 }
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222 }
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223 return lastEntryRevision;
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224 }
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225
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226 private byte[] toByteArray(DataSource content) throws HgIOException, HgRuntimeException {
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227 ByteArraySerializer ba = new ByteArraySerializer();
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228 content.serialize(ba);
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229 return ba.toByteArray();
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230 }
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231
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232 private Nodeid revision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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233 if (revisionIndex == NO_REVISION) {
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234 return Nodeid.NULL;
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235 }
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236 Nodeid n = revisionCache.get(revisionIndex);
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237 if (n == null) {
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238 n = Nodeid.fromBinary(revlogStream.nodeid(revisionIndex), 0);
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239 revisionCache.put(revisionIndex, n);
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240 }
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241 return n;
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242 }
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243
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244 private int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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245 assert revisionIndex >= 0;
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246 if (revisionIndex == lastEntryIndex && lastEntryActualLen >= 0) {
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247 // if the last entry is the one we've just written, we know its actual len.
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248 // it's possible, however, that revisionIndex == lastEntryIndex just
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249 // because revision being added comes right after last locally known one
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250 // and lastEntryActualLen is not set
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251 return lastEntryActualLen;
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252 }
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253 if (lastFullContent != null && lastFullContent.first() == revisionIndex) {
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254 return lastFullContent.second().length;
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255 }
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256 return revlogStream.dataLength(revisionIndex);
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257 }
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258
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259 private void populateLastEntryIndex() throws HgRuntimeException {
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260 int revCount = revlogStream.revisionCount();
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261 lastEntryIndex = revCount == 0 ? NO_REVISION : revCount - 1;
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262 }
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263
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264 private void populateLastEntryContent() throws HgIOException, HgRuntimeException {
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265 if (lastFullContent != null && lastFullContent.first() == lastEntryIndex) {
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266 // we have last entry cached
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267 return;
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268 }
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269 lastEntryRevision = Nodeid.NULL;
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270 if (lastEntryIndex != NO_REVISION) {
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271 ReadContentInspector insp = new ReadContentInspector().read(revlogStream, lastEntryIndex);
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272 lastEntryBase = insp.baseRev;
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273 lastEntryRevision = insp.rev;
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274 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, insp.content);
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275 } else {
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276 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, new byte[0]);
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277 }
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278 assert lastFullContent.first() == lastEntryIndex;
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279 assert lastFullContent.second() != null;
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280 }
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281
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282 public static boolean preferCompleteOverPatch(int patchLength, int fullContentLength) {
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283 return !decideWorthEffort(patchLength, fullContentLength);
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284 }
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285
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286 public static boolean preferCompressedOverComplete(int compressedLen, int fullContentLength) {
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287 if (compressedLen <= 0) { // just in case, meaningless otherwise
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288 return false;
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289 }
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290 return decideWorthEffort(compressedLen, fullContentLength);
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291 }
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292
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293 // true if length obtained with effort is worth it
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294 private static boolean decideWorthEffort(int lengthWithExtraEffort, int lengthWithoutEffort) {
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295 return lengthWithExtraEffort < (/* 3/4 of original */lengthWithoutEffort - (lengthWithoutEffort >>> 2));
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296 }
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297
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298 /*XXX public because HgCloneCommand uses it*/
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299 public static class HeaderWriter implements DataSerializer.DataSource {
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300 private final ByteBuffer header;
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301 private final boolean isInline;
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302 private long offset;
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303 private int length, compressedLength;
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304 private int baseRev, linkRev, p1, p2;
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305 private byte[] nodeid;
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306
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307 public HeaderWriter(boolean inline) {
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308 isInline = inline;
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309 header = ByteBuffer.allocate(REVLOGV1_RECORD_SIZE);
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310 }
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311
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312 public HeaderWriter offset(long offset) {
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313 this.offset = offset;
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314 return this;
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315 }
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316
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317 public int baseRevision() {
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318 return baseRev;
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319 }
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320
530
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321 public HeaderWriter baseRevision(int baseRevision) {
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322 this.baseRev = baseRevision;
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323 return this;
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324 }
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325
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326 public HeaderWriter length(int len, int compressedLen) {
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327 this.length = len;
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328 this.compressedLength = compressedLen;
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329 return this;
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330 }
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331
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332 public HeaderWriter parents(int parent1, int parent2) {
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333 p1 = parent1;
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334 p2 = parent2;
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335 return this;
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336 }
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337
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338 public HeaderWriter linkRevision(int linkRevision) {
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339 linkRev = linkRevision;
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340 return this;
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341 }
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342
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343 public HeaderWriter nodeid(Nodeid n) {
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344 nodeid = n.toByteArray();
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345 return this;
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346 }
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347
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348 public HeaderWriter nodeid(byte[] nodeidBytes) {
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349 nodeid = nodeidBytes;
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350 return this;
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351 }
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352
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353 public void serialize(DataSerializer out) throws HgIOException {
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354 header.clear();
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355 if (offset == 0) {
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356 int version = 1 /* RevlogNG */;
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357 if (isInline) {
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358 version |= RevlogStream.INLINEDATA;
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359 }
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360 header.putInt(version);
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361 header.putInt(0);
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362 } else {
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363 header.putLong(offset << 16);
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364 }
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365 header.putInt(compressedLength);
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366 header.putInt(length);
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367 header.putInt(baseRev);
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368 header.putInt(linkRev);
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369 header.putInt(p1);
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370 header.putInt(p2);
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371 header.put(nodeid);
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372 // assume 12 bytes left are zeros
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373 out.write(header.array(), 0, header.capacity());
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374
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375 // regardless whether it's inline or separate data,
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376 // offset field always represent cumulative compressedLength
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377 // (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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378 offset += compressedLength;
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379 }
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380
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381 public int serializeLength() {
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382 return header.capacity();
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383 }
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384 }
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385
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386 // XXX part of HgRevisionMap contract, need public counterparts (along with IndexToRevisionMap)
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387 public interface RevisionToIndexMap {
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388
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389 /**
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390 * @return {@link HgRepository#NO_REVISION} if unknown revision
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391 */
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392 int revisionIndex(Nodeid revision);
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393 }
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394
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395 private static class ReadContentInspector implements RevlogStream.Inspector {
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396 public int baseRev;
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397 public Nodeid rev;
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398 public byte[] content;
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399 private IOException failure;
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400
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401 public ReadContentInspector read(RevlogStream rs, int revIndex) throws HgIOException, HgRuntimeException {
660
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402 assert revIndex >= 0;
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403 rs.iterate(revIndex, revIndex, true, this);
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404 if (failure != null) {
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405 String m = String.format("Failed to get content of revision %d", revIndex);
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406 throw rs.initWithIndexFile(new HgIOException(m, failure, null));
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407 }
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408 return this;
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409 }
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410
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411 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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412 try {
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413 baseRev = baseRevision;
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414 rev = Nodeid.fromBinary(nodeid, 0);
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415 content = data.byteArray();
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416 } catch (IOException ex) {
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417 failure = ex;
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418 }
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419 }
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420 }
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421 }