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annotate src/org/tmatesoft/hg/internal/RevlogStreamWriter.java @ 709:497e697636fc

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Report merged lines as changed block if possible, not as a sequence of added/deleted blocks. To facilitate access to merge parent lines AddBlock got mergeLineAt() method that reports index of the line in the second parent (if any), while insertedAt() has been changed to report index in the first parent always
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 21 Aug 2013 16:23:27 +0200
parents 4ffc17c0b534
children
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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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 Nodeid p1Rev = revision(p1);
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148 Nodeid p2Rev = revision(p2);
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149 Nodeid newRev = Nodeid.fromBinary(dh.sha1(p1Rev, p2Rev, contentByteArray).asBinary(), 0);
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150 if (newRev.equals(p1Rev)) { // shall never happen, same content but different parents give new SHA. Doesn't hurt to check, though
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151 assert p2Rev.isNull();
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152 return new Pair<Integer, Nodeid>(p1, p1Rev);
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153 }
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154 //
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155 Patch patch = GeneratePatchInspector.delta(lastFullContent.second(), contentByteArray);
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156 int patchSerializedLength = patch.serializedLength();
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157 final boolean writeComplete = preferCompleteOverPatch(patchSerializedLength, contentByteArray.length);
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158 DataSerializer.DataSource dataSource = writeComplete ? new ByteArrayDataSource(contentByteArray) : patch.new PatchDataSource();
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159 //
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160 doAdd(newRev, p1, p2, linkRevision, writeComplete ? lastEntryIndex+1 : lastEntryBase, contentByteArray.length, dataSource);
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161 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, contentByteArray);
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162 return new Pair<Integer, Nodeid>(lastEntryIndex, lastEntryRevision);
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163 }
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164
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165 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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166 assert linkRevision >= 0;
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167 assert baseRevision >= 0;
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168 assert p1 == NO_REVISION || p1 >= 0;
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169 assert p2 == NO_REVISION || p2 >= 0;
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170 assert !rev.isNull();
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171 assert revLen >= 0;
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172 revlogDataZip.reset(dataSource);
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173 final int compressedLen;
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174 final boolean useCompressedData = preferCompressedOverComplete(revlogDataZip.getCompressedLength(), dataSource.serializeLength());
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175 if (useCompressedData) {
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176 compressedLen= revlogDataZip.getCompressedLength();
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177 } else {
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178 // compression wasn't too effective,
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179 compressedLen = dataSource.serializeLength() + 1 /*1 byte for 'u' - uncompressed prefix byte*/;
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180 }
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181 //
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182 DataSerializer indexFile, dataFile;
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183 indexFile = dataFile = null;
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184 try {
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185 // 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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186 indexFile = revlogStream.getIndexStreamWriter(transaction);
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187 final boolean isInlineData = revlogStream.isInlineData();
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188 HeaderWriter revlogHeader = new HeaderWriter(isInlineData);
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189 revlogHeader.length(revLen, compressedLen);
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190 revlogHeader.nodeid(rev.toByteArray());
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191 revlogHeader.linkRevision(linkRevision);
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192 revlogHeader.parents(p1, p2);
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193 revlogHeader.baseRevision(baseRevision);
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194 long lastEntryOffset = revlogStream.newEntryOffset();
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195 revlogHeader.offset(lastEntryOffset);
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196 //
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197 revlogHeader.serialize(indexFile);
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198
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199 if (isInlineData) {
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200 dataFile = indexFile;
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201 } else {
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202 dataFile = revlogStream.getDataStreamWriter(transaction);
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203 }
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204 if (useCompressedData) {
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205 int actualCompressedLenWritten = revlogDataZip.writeCompressedData(dataFile);
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206 if (actualCompressedLenWritten != compressedLen) {
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207 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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208 }
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209 } else {
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210 dataFile.writeByte((byte) 'u');
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211 dataSource.serialize(dataFile);
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212 }
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213
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214 lastEntryBase = revlogHeader.baseRevision();
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215 lastEntryIndex++;
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216 lastEntryActualLen = revLen;
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217 lastEntryRevision = rev;
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218 revisionCache.put(lastEntryIndex, lastEntryRevision);
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219
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220 revlogStream.revisionAdded(lastEntryIndex, lastEntryRevision, lastEntryBase, lastEntryOffset);
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221 } finally {
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222 indexFile.done();
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223 if (dataFile != null && dataFile != indexFile) {
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224 dataFile.done();
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225 }
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226 }
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227 return lastEntryRevision;
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228 }
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229
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230 private byte[] toByteArray(DataSource content) throws HgIOException, HgRuntimeException {
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231 ByteArraySerializer ba = new ByteArraySerializer();
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232 content.serialize(ba);
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233 return ba.toByteArray();
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234 }
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235
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236 private Nodeid revision(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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237 if (revisionIndex == NO_REVISION) {
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238 return Nodeid.NULL;
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239 }
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240 Nodeid n = revisionCache.get(revisionIndex);
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241 if (n == null) {
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242 n = Nodeid.fromBinary(revlogStream.nodeid(revisionIndex), 0);
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243 revisionCache.put(revisionIndex, n);
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244 }
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245 return n;
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246 }
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247
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248 private int dataLength(int revisionIndex) throws HgInvalidControlFileException, HgInvalidRevisionException {
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249 assert revisionIndex >= 0;
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250 if (revisionIndex == lastEntryIndex && lastEntryActualLen >= 0) {
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251 // if the last entry is the one we've just written, we know its actual len.
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252 // it's possible, however, that revisionIndex == lastEntryIndex just
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253 // because revision being added comes right after last locally known one
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254 // and lastEntryActualLen is not set
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255 return lastEntryActualLen;
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256 }
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257 if (lastFullContent != null && lastFullContent.first() == revisionIndex) {
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258 return lastFullContent.second().length;
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259 }
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260 return revlogStream.dataLength(revisionIndex);
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261 }
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262
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263 private void populateLastEntryIndex() throws HgRuntimeException {
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264 int revCount = revlogStream.revisionCount();
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265 lastEntryIndex = revCount == 0 ? NO_REVISION : revCount - 1;
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266 }
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267
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268 private void populateLastEntryContent() throws HgIOException, HgRuntimeException {
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269 if (lastFullContent != null && lastFullContent.first() == lastEntryIndex) {
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270 // we have last entry cached
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271 return;
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272 }
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273 lastEntryRevision = Nodeid.NULL;
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274 if (lastEntryIndex != NO_REVISION) {
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275 ReadContentInspector insp = new ReadContentInspector().read(revlogStream, lastEntryIndex);
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276 lastEntryBase = insp.baseRev;
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277 lastEntryRevision = insp.rev;
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278 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, insp.content);
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279 } else {
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280 lastFullContent = new Pair<Integer, byte[]>(lastEntryIndex, new byte[0]);
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281 }
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282 assert lastFullContent.first() == lastEntryIndex;
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283 assert lastFullContent.second() != null;
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284 }
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285
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286 public static boolean preferCompleteOverPatch(int patchLength, int fullContentLength) {
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287 return !decideWorthEffort(patchLength, fullContentLength);
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288 }
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289
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290 public static boolean preferCompressedOverComplete(int compressedLen, int fullContentLength) {
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291 if (compressedLen <= 0) { // just in case, meaningless otherwise
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292 return false;
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293 }
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294 return decideWorthEffort(compressedLen, fullContentLength);
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295 }
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296
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297 // true if length obtained with effort is worth it
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298 private static boolean decideWorthEffort(int lengthWithExtraEffort, int lengthWithoutEffort) {
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299 return lengthWithExtraEffort < (/* 3/4 of original */lengthWithoutEffort - (lengthWithoutEffort >>> 2));
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300 }
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301
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302 /*XXX public because HgCloneCommand uses it*/
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303 public static class HeaderWriter implements DataSerializer.DataSource {
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304 private final ByteBuffer header;
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305 private final boolean isInline;
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306 private long offset;
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307 private int length, compressedLength;
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308 private int baseRev, linkRev, p1, p2;
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309 private byte[] nodeid;
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310
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311 public HeaderWriter(boolean inline) {
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312 isInline = inline;
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313 header = ByteBuffer.allocate(REVLOGV1_RECORD_SIZE);
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314 }
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315
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316 public HeaderWriter offset(long offset) {
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317 this.offset = offset;
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318 return this;
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319 }
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320
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321 public int baseRevision() {
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322 return baseRev;
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323 }
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324
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325 public HeaderWriter baseRevision(int baseRevision) {
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326 this.baseRev = baseRevision;
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327 return this;
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328 }
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329
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330 public HeaderWriter length(int len, int compressedLen) {
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331 this.length = len;
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332 this.compressedLength = compressedLen;
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333 return this;
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334 }
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335
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336 public HeaderWriter parents(int parent1, int parent2) {
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337 p1 = parent1;
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338 p2 = parent2;
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339 return this;
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340 }
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341
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342 public HeaderWriter linkRevision(int linkRevision) {
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343 linkRev = linkRevision;
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344 return this;
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345 }
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346
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347 public HeaderWriter nodeid(Nodeid n) {
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348 nodeid = n.toByteArray();
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349 return this;
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350 }
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351
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352 public HeaderWriter nodeid(byte[] nodeidBytes) {
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353 nodeid = nodeidBytes;
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354 return this;
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355 }
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356
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357 public void serialize(DataSerializer out) throws HgIOException {
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358 header.clear();
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359 if (offset == 0) {
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360 int version = 1 /* RevlogNG */;
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361 if (isInline) {
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362 version |= RevlogStream.INLINEDATA;
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363 }
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364 header.putInt(version);
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365 header.putInt(0);
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366 } else {
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367 header.putLong(offset << 16);
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368 }
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369 header.putInt(compressedLength);
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370 header.putInt(length);
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371 header.putInt(baseRev);
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372 header.putInt(linkRev);
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373 header.putInt(p1);
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374 header.putInt(p2);
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375 header.put(nodeid);
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376 // assume 12 bytes left are zeros
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377 out.write(header.array(), 0, header.capacity());
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378
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379 // regardless whether it's inline or separate data,
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380 // offset field always represent cumulative compressedLength
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381 // (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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382 offset += compressedLength;
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383 }
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385 public int serializeLength() {
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386 return header.capacity();
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387 }
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388 }
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389
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390 // XXX part of HgRevisionMap contract, need public counterparts (along with IndexToRevisionMap)
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391 public interface RevisionToIndexMap {
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392
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393 /**
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394 * @return {@link HgRepository#NO_REVISION} if unknown revision
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395 */
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396 int revisionIndex(Nodeid revision);
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397 }
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398
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399 private static class ReadContentInspector implements RevlogStream.Inspector {
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400 public int baseRev;
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401 public Nodeid rev;
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402 public byte[] content;
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403 private IOException failure;
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404
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405 public ReadContentInspector read(RevlogStream rs, int revIndex) throws HgIOException, HgRuntimeException {
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406 assert revIndex >= 0;
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407 rs.iterate(revIndex, revIndex, true, this);
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408 if (failure != null) {
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409 String m = String.format("Failed to get content of revision %d", revIndex);
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410 throw rs.initWithIndexFile(new HgIOException(m, failure, null));
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411 }
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412 return this;
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413 }
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414
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415 public void next(int revisionIndex, int actualLen, int baseRevision, int linkRevision, int parent1Revision, int parent2Revision, byte[] nodeid, DataAccess data) {
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416 try {
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417 baseRev = baseRevision;
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418 rev = Nodeid.fromBinary(nodeid, 0);
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419 content = data.byteArray();
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420 } catch (IOException ex) {
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421 failure = ex;
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422 }
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423 }
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424 }
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425 }