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annotate src/org/tmatesoft/hg/internal/CommitFacility.java @ 606:5daa42067e7c

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Avoid mmap files when only few bytes are to be read
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Tue, 07 May 2013 14:16:35 +0200
parents c56edf42be64
children 66f1cc23b906
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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18
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19 import static org.tmatesoft.hg.repo.HgRepository.NO_REVISION;
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20
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21 import java.io.IOException;
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22 import java.nio.ByteBuffer;
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23 import java.util.ArrayList;
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24 import java.util.HashMap;
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25 import java.util.LinkedHashMap;
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26 import java.util.Map;
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27 import java.util.Set;
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28 import java.util.TreeMap;
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29 import java.util.TreeSet;
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30
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31 import org.tmatesoft.hg.core.HgCommitCommand;
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32 import org.tmatesoft.hg.core.HgIOException;
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33 import org.tmatesoft.hg.core.HgRepositoryLockException;
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34 import org.tmatesoft.hg.core.Nodeid;
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35 import org.tmatesoft.hg.repo.HgChangelog;
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36 import org.tmatesoft.hg.repo.HgDataFile;
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37 import org.tmatesoft.hg.repo.HgRepository;
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38 import org.tmatesoft.hg.util.Pair;
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39 import org.tmatesoft.hg.util.Path;
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40 import org.tmatesoft.hg.util.LogFacility.Severity;
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41
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42 /**
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43 * WORK IN PROGRESS
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44 * Name: CommitObject, FutureCommit or PendingCommit
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45 * Only public API now: {@link HgCommitCommand}.
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46 *
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47 * @author Artem Tikhomirov
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48 * @author TMate Software Ltd.
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49 */
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50 @Experimental(reason="Work in progress")
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51 public final class CommitFacility {
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52 private final Internals repo;
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53 private final int p1Commit, p2Commit;
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54 private Map<Path, Pair<HgDataFile, ByteDataSupplier>> files = new LinkedHashMap<Path, Pair<HgDataFile, ByteDataSupplier>>();
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55 private Set<Path> removals = new TreeSet<Path>();
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56 private String branch, user;
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57
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58 public CommitFacility(Internals hgRepo, int parentCommit) {
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59 this(hgRepo, parentCommit, NO_REVISION);
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60 }
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61
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62 public CommitFacility(Internals hgRepo, int parent1Commit, int parent2Commit) {
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63 repo = hgRepo;
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64 p1Commit = parent1Commit;
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65 p2Commit = parent2Commit;
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66 if (parent1Commit != NO_REVISION && parent1Commit == parent2Commit) {
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67 throw new IllegalArgumentException("Merging same revision is dubious");
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68 }
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69 }
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70
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71 public boolean isMerge() {
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72 return p1Commit != NO_REVISION && p2Commit != NO_REVISION;
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73 }
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74
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75 public void add(HgDataFile dataFile, ByteDataSupplier content) {
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76 if (content == null) {
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77 throw new IllegalArgumentException();
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78 }
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79 removals.remove(dataFile.getPath());
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80 files.put(dataFile.getPath(), new Pair<HgDataFile, ByteDataSupplier>(dataFile, content));
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81 }
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82
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83 public void forget(HgDataFile dataFile) {
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84 files.remove(dataFile.getPath());
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85 removals.add(dataFile.getPath());
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86 }
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87
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88 public void branch(String branchName) {
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89 branch = branchName;
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90 }
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91
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92 public void user(String userName) {
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93 user = userName;
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94 }
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95
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96 public Nodeid commit(String message) throws HgIOException, HgRepositoryLockException {
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97 final HgChangelog clog = repo.getRepo().getChangelog();
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98 final int clogRevisionIndex = clog.getRevisionCount();
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99 ManifestRevision c1Manifest = new ManifestRevision(null, null);
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100 ManifestRevision c2Manifest = new ManifestRevision(null, null);
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101 if (p1Commit != NO_REVISION) {
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102 repo.getRepo().getManifest().walk(p1Commit, p1Commit, c1Manifest);
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103 }
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104 if (p2Commit != NO_REVISION) {
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105 repo.getRepo().getManifest().walk(p2Commit, p2Commit, c2Manifest);
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106 }
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107 // Pair<Integer, Integer> manifestParents = getManifestParents();
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108 Pair<Integer, Integer> manifestParents = new Pair<Integer, Integer>(c1Manifest.revisionIndex(), c2Manifest.revisionIndex());
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109 TreeMap<Path, Nodeid> newManifestRevision = new TreeMap<Path, Nodeid>();
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110 HashMap<Path, Pair<Integer, Integer>> fileParents = new HashMap<Path, Pair<Integer,Integer>>();
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111 for (Path f : c1Manifest.files()) {
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112 HgDataFile df = repo.getRepo().getFileNode(f);
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113 Nodeid fileKnownRev1 = c1Manifest.nodeid(f), fileKnownRev2;
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114 final int fileRevIndex1 = df.getRevisionIndex(fileKnownRev1);
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115 final int fileRevIndex2;
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116 if ((fileKnownRev2 = c2Manifest.nodeid(f)) != null) {
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117 // merged files
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118 fileRevIndex2 = df.getRevisionIndex(fileKnownRev2);
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119 } else {
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120 fileRevIndex2 = NO_REVISION;
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121 }
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122
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123 fileParents.put(f, new Pair<Integer, Integer>(fileRevIndex1, fileRevIndex2));
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124 newManifestRevision.put(f, fileKnownRev1);
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125 }
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126 //
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127 // Forget removed
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128 for (Path p : removals) {
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129 newManifestRevision.remove(p);
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130 }
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131 //
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132 // Register new/changed
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133 ArrayList<Path> newlyAddedFiles = new ArrayList<Path>();
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134 ArrayList<Path> touchInDirstate = new ArrayList<Path>();
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135 for (Pair<HgDataFile, ByteDataSupplier> e : files.values()) {
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136 HgDataFile df = e.first();
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137 Pair<Integer, Integer> fp = fileParents.get(df.getPath());
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138 if (fp == null) {
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139 // NEW FILE
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140 fp = new Pair<Integer, Integer>(NO_REVISION, NO_REVISION);
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141 }
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142 ByteDataSupplier bds = e.second();
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143 // FIXME quickfix, instead, pass ByteDataSupplier directly to RevlogStreamWriter
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144 ByteBuffer bb = ByteBuffer.allocate(2048);
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145 ByteArrayChannel bac = new ByteArrayChannel();
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146 while (bds.read(bb) != -1) {
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147 bb.flip();
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148 bac.write(bb);
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149 bb.clear();
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150 }
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151 RevlogStream contentStream;
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152 if (df.exists()) {
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153 contentStream = repo.getImplAccess().getStream(df);
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154 } else {
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155 contentStream = repo.createStoreFile(df.getPath());
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156 newlyAddedFiles.add(df.getPath());
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157 // FIXME df doesn't get df.content updated, and clients
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158 // that would attempt to access newly added file after commit would fail
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159 // (despite the fact the file is in there)
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160 }
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161 RevlogStreamWriter fileWriter = new RevlogStreamWriter(repo, contentStream);
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162 Nodeid fileRev = fileWriter.addRevision(bac.toArray(), clogRevisionIndex, fp.first(), fp.second());
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163 newManifestRevision.put(df.getPath(), fileRev);
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164 touchInDirstate.add(df.getPath());
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165 }
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166 //
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167 // Manifest
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168 final ManifestEntryBuilder manifestBuilder = new ManifestEntryBuilder();
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169 for (Map.Entry<Path, Nodeid> me : newManifestRevision.entrySet()) {
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170 manifestBuilder.add(me.getKey().toString(), me.getValue());
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171 }
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172 RevlogStreamWriter manifestWriter = new RevlogStreamWriter(repo, repo.getImplAccess().getManifestStream());
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173 Nodeid manifestRev = manifestWriter.addRevision(manifestBuilder.build(), clogRevisionIndex, manifestParents.first(), manifestParents.second());
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174 //
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175 // Changelog
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176 final ChangelogEntryBuilder changelogBuilder = new ChangelogEntryBuilder();
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177 changelogBuilder.setModified(files.keySet());
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178 changelogBuilder.branch(branch == null ? HgRepository.DEFAULT_BRANCH_NAME : branch);
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179 changelogBuilder.user(String.valueOf(user));
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180 byte[] clogContent = changelogBuilder.build(manifestRev, message);
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181 RevlogStreamWriter changelogWriter = new RevlogStreamWriter(repo, repo.getImplAccess().getChangelogStream());
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182 Nodeid changesetRev = changelogWriter.addRevision(clogContent, clogRevisionIndex, p1Commit, p2Commit);
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183 // FIXME move fncache update to an external facility, along with dirstate and bookmark update
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184 if (!newlyAddedFiles.isEmpty() && repo.fncacheInUse()) {
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185 FNCacheFile fncache = new FNCacheFile(repo);
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186 for (Path p : newlyAddedFiles) {
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187 fncache.add(p);
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188 }
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189 try {
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190 fncache.write();
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191 } catch (IOException ex) {
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192 // see comment above for fnchache.read()
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193 repo.getSessionContext().getLog().dump(getClass(), Severity.Error, ex, "Failed to write fncache, error ignored");
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194 }
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195 }
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196 // bring dirstate up to commit state
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197 final DirstateBuilder dirstateBuilder = new DirstateBuilder(repo);
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198 dirstateBuilder.fillFrom(new DirstateReader(repo, new Path.SimpleSource()));
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199 for (Path p : removals) {
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200 dirstateBuilder.recordRemoved(p);
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201 }
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202 for (Path p : touchInDirstate) {
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203 dirstateBuilder.recordUncertain(p);
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204 }
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205 dirstateBuilder.parents(changesetRev, Nodeid.NULL);
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206 dirstateBuilder.serialize();
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207 // update bookmarks
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208 Nodeid p1Cset = p1Commit == NO_REVISION ? null : clog.getRevision(p1Commit);
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209 Nodeid p2Cset = p2Commit == NO_REVISION ? null : clog.getRevision(p2Commit);
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210 if (p1Commit != NO_REVISION || p2Commit != NO_REVISION) {
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211 repo.getRepo().getBookmarks().updateActive(p1Cset, p2Cset, changesetRev);
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212 }
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213 return changesetRev;
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214 }
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215 /*
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216 private Pair<Integer, Integer> getManifestParents() {
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217 return new Pair<Integer, Integer>(extractManifestRevisionIndex(p1Commit), extractManifestRevisionIndex(p2Commit));
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218 }
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219
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220 private int extractManifestRevisionIndex(int clogRevIndex) {
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221 if (clogRevIndex == NO_REVISION) {
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222 return NO_REVISION;
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223 }
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224 RawChangeset commitObject = repo.getChangelog().range(clogRevIndex, clogRevIndex).get(0);
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225 Nodeid manifestRev = commitObject.manifest();
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226 if (manifestRev.isNull()) {
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227 return NO_REVISION;
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228 }
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229 return repo.getManifest().getRevisionIndex(manifestRev);
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230 }
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231 */
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232
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233 // unlike DataAccess (which provides structured access), this one
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234 // deals with a sequence of bytes, when there's no need in structure of the data
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235 // FIXME java.nio.ReadableByteChannel or ByteStream/ByteSequence(read, length, reset)
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236 // SHALL be inline with util.ByteChannel, reading bytes from HgDataFile, preferably DataAccess#readBytes(BB) to match API,
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237 // and a wrap for ByteVector
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238 public interface ByteDataSupplier { // TODO look if can resolve DataAccess in HgCloneCommand visibility issue
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239 // FIXME needs lifecycle, e.g. for supplier that reads from WC
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240 int read(ByteBuffer buf);
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241 }
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242
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243 public interface ByteDataConsumer {
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244 void write(ByteBuffer buf);
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245 }
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246 }