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annotate src/org/tmatesoft/hg/repo/CommitFacility.java @ 587:a52f4cc56f9c

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Minimize vectors re-allocating when merging patches
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 26 Apr 2013 20:04:17 +0200
parents 73c20c648c1f
children 41218d84842a
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.repo;
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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.HgRepositoryLockException;
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33 import org.tmatesoft.hg.core.Nodeid;
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34 import org.tmatesoft.hg.internal.ByteArrayChannel;
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35 import org.tmatesoft.hg.internal.ChangelogEntryBuilder;
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36 import org.tmatesoft.hg.internal.Experimental;
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37 import org.tmatesoft.hg.internal.FNCacheFile;
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38 import org.tmatesoft.hg.internal.ManifestEntryBuilder;
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39 import org.tmatesoft.hg.internal.ManifestRevision;
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40 import org.tmatesoft.hg.internal.RevlogStream;
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41 import org.tmatesoft.hg.internal.RevlogStreamWriter;
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42 import org.tmatesoft.hg.util.Pair;
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43 import org.tmatesoft.hg.util.Path;
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44 import org.tmatesoft.hg.util.LogFacility.Severity;
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45
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46 /**
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47 * WORK IN PROGRESS
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48 * Name: CommitObject, FutureCommit or PendingCommit
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49 * Only public API now: {@link HgCommitCommand}. TEMPORARILY lives in the oth.repo public packages, until code interdependencies are resolved
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50 *
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51 * @author Artem Tikhomirov
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52 * @author TMate Software Ltd.
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53 */
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54 @Experimental(reason="Work in progress")
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55 public final class CommitFacility {
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56 private final HgRepository repo;
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57 private final int p1Commit, p2Commit;
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58 private Map<Path, Pair<HgDataFile, ByteDataSupplier>> files = new LinkedHashMap<Path, Pair<HgDataFile, ByteDataSupplier>>();
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59 private Set<Path> removals = new TreeSet<Path>();
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60 private String branch, user;
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61
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62 public CommitFacility(HgRepository hgRepo, int parentCommit) {
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63 this(hgRepo, parentCommit, NO_REVISION);
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64 }
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65
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66 public CommitFacility(HgRepository hgRepo, int parent1Commit, int parent2Commit) {
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67 repo = hgRepo;
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68 p1Commit = parent1Commit;
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69 p2Commit = parent2Commit;
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70 if (parent1Commit != NO_REVISION && parent1Commit == parent2Commit) {
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71 throw new IllegalArgumentException("Merging same revision is dubious");
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72 }
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73 }
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74
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75 public boolean isMerge() {
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76 return p1Commit != NO_REVISION && p2Commit != NO_REVISION;
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77 }
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78
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79 public void add(HgDataFile dataFile, ByteDataSupplier content) {
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80 if (content == null) {
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81 throw new IllegalArgumentException();
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82 }
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83 removals.remove(dataFile.getPath());
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84 files.put(dataFile.getPath(), new Pair<HgDataFile, ByteDataSupplier>(dataFile, content));
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85 }
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86
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87 public void forget(HgDataFile dataFile) {
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88 files.remove(dataFile.getPath());
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89 removals.add(dataFile.getPath());
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90 }
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91
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92 public void branch(String branchName) {
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93 branch = branchName;
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94 }
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95
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96 public void user(String userName) {
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97 user = userName;
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98 }
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99
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100 public Nodeid commit(String message) throws HgRepositoryLockException {
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101
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102 final HgChangelog clog = repo.getChangelog();
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103 final int clogRevisionIndex = clog.getRevisionCount();
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104 ManifestRevision c1Manifest = new ManifestRevision(null, null);
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105 ManifestRevision c2Manifest = new ManifestRevision(null, null);
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106 if (p1Commit != NO_REVISION) {
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107 repo.getManifest().walk(p1Commit, p1Commit, c1Manifest);
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108 }
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109 if (p2Commit != NO_REVISION) {
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110 repo.getManifest().walk(p2Commit, p2Commit, c2Manifest);
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111 }
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112 // Pair<Integer, Integer> manifestParents = getManifestParents();
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113 Pair<Integer, Integer> manifestParents = new Pair<Integer, Integer>(c1Manifest.revisionIndex(), c2Manifest.revisionIndex());
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114 TreeMap<Path, Nodeid> newManifestRevision = new TreeMap<Path, Nodeid>();
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115 HashMap<Path, Pair<Integer, Integer>> fileParents = new HashMap<Path, Pair<Integer,Integer>>();
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116 for (Path f : c1Manifest.files()) {
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117 HgDataFile df = repo.getFileNode(f);
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118 Nodeid fileKnownRev1 = c1Manifest.nodeid(f), fileKnownRev2;
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119 final int fileRevIndex1 = df.getRevisionIndex(fileKnownRev1);
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120 final int fileRevIndex2;
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121 if ((fileKnownRev2 = c2Manifest.nodeid(f)) != null) {
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122 // merged files
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123 fileRevIndex2 = df.getRevisionIndex(fileKnownRev2);
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124 } else {
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125 fileRevIndex2 = NO_REVISION;
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126 }
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127
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128 fileParents.put(f, new Pair<Integer, Integer>(fileRevIndex1, fileRevIndex2));
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129 newManifestRevision.put(f, fileKnownRev1);
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130 }
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131 //
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132 // Forget removed
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133 for (Path p : removals) {
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134 newManifestRevision.remove(p);
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135 }
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136 //
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137 // Register new/changed
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138 ArrayList<Path> newlyAddedFiles = new ArrayList<Path>();
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139 for (Pair<HgDataFile, ByteDataSupplier> e : files.values()) {
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140 HgDataFile df = e.first();
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141 Pair<Integer, Integer> fp = fileParents.get(df.getPath());
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142 if (fp == null) {
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143 // NEW FILE
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144 fp = new Pair<Integer, Integer>(NO_REVISION, NO_REVISION);
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145 }
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146 ByteDataSupplier bds = e.second();
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147 // FIXME quickfix, instead, pass ByteDataSupplier directly to RevlogStreamWriter
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148 ByteBuffer bb = ByteBuffer.allocate(2048);
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149 ByteArrayChannel bac = new ByteArrayChannel();
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150 while (bds.read(bb) != -1) {
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151 bb.flip();
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152 bac.write(bb);
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153 bb.clear();
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154 }
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155 RevlogStream contentStream;
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156 if (df.exists()) {
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157 contentStream = df.content;
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158 } else {
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159 contentStream = repo.createStoreFile(df.getPath());
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160 newlyAddedFiles.add(df.getPath());
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161 // FIXME df doesn't get df.content updated, and clients
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162 // that would attempt to access newly added file after commit would fail
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163 // (despite the fact the file is in there)
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164 }
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165 RevlogStreamWriter fileWriter = new RevlogStreamWriter(repo.getSessionContext(), contentStream);
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166 Nodeid fileRev = fileWriter.addRevision(bac.toArray(), clogRevisionIndex, fp.first(), fp.second());
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167 newManifestRevision.put(df.getPath(), fileRev);
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168 }
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169 //
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170 // Manifest
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171 final ManifestEntryBuilder manifestBuilder = new ManifestEntryBuilder();
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172 for (Map.Entry<Path, Nodeid> me : newManifestRevision.entrySet()) {
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173 manifestBuilder.add(me.getKey().toString(), me.getValue());
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174 }
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175 RevlogStreamWriter manifestWriter = new RevlogStreamWriter(repo.getSessionContext(), repo.getManifest().content);
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176 Nodeid manifestRev = manifestWriter.addRevision(manifestBuilder.build(), clogRevisionIndex, manifestParents.first(), manifestParents.second());
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177 //
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178 // Changelog
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179 final ChangelogEntryBuilder changelogBuilder = new ChangelogEntryBuilder();
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180 changelogBuilder.setModified(files.keySet());
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181 changelogBuilder.branch(branch == null ? HgRepository.DEFAULT_BRANCH_NAME : branch);
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182 changelogBuilder.user(String.valueOf(user));
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183 byte[] clogContent = changelogBuilder.build(manifestRev, message);
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184 RevlogStreamWriter changelogWriter = new RevlogStreamWriter(repo.getSessionContext(), clog.content);
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185 Nodeid changesetRev = changelogWriter.addRevision(clogContent, clogRevisionIndex, p1Commit, p2Commit);
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186 // FIXME move fncache update to an external facility, along with dirstate update
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187 if (!newlyAddedFiles.isEmpty() && repo.getImplHelper().fncacheInUse()) {
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188 FNCacheFile fncache = new FNCacheFile(repo.getImplHelper());
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189 for (Path p : newlyAddedFiles) {
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190 fncache.add(p);
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191 }
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192 try {
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193 fncache.write();
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194 } catch (IOException ex) {
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195 // see comment above for fnchache.read()
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196 repo.getSessionContext().getLog().dump(getClass(), Severity.Error, ex, "Failed to write fncache, error ignored");
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197 }
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198 }
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199 return changesetRev;
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200 }
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201 /*
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202 private Pair<Integer, Integer> getManifestParents() {
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203 return new Pair<Integer, Integer>(extractManifestRevisionIndex(p1Commit), extractManifestRevisionIndex(p2Commit));
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204 }
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205
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206 private int extractManifestRevisionIndex(int clogRevIndex) {
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207 if (clogRevIndex == NO_REVISION) {
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208 return NO_REVISION;
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209 }
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210 RawChangeset commitObject = repo.getChangelog().range(clogRevIndex, clogRevIndex).get(0);
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211 Nodeid manifestRev = commitObject.manifest();
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212 if (manifestRev.isNull()) {
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213 return NO_REVISION;
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214 }
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215 return repo.getManifest().getRevisionIndex(manifestRev);
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216 }
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217 */
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218
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219 // unlike DataAccess (which provides structured access), this one
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220 // deals with a sequence of bytes, when there's no need in structure of the data
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221 // FIXME java.nio.ReadableByteChannel or ByteStream/ByteSequence(read, length, reset)
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222 // SHALL be inline with util.ByteChannel, reading bytes from HgDataFile, preferably DataAccess#readBytes(BB) to match API,
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223 // and a wrap for ByteVector
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224 public interface ByteDataSupplier { // TODO look if can resolve DataAccess in HgCloneCommand visibility issue
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225 // FIXME needs lifecycle, e.g. for supplier that reads from WC
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226 int read(ByteBuffer buf);
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227 }
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228
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229 public interface ByteDataConsumer {
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230 void write(ByteBuffer buf);
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231 }
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232 }