annotate src/org/tmatesoft/hg/core/HgCommitCommand.java @ 606:5daa42067e7c

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 e447384f3771
children 65c01508f002
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.core;
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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
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25 import org.tmatesoft.hg.internal.ByteArrayChannel;
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26 import org.tmatesoft.hg.internal.CommitFacility;
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27 import org.tmatesoft.hg.internal.Experimental;
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28 import org.tmatesoft.hg.internal.FileContentSupplier;
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29 import org.tmatesoft.hg.internal.Internals;
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30 import org.tmatesoft.hg.repo.HgChangelog;
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31 import org.tmatesoft.hg.repo.HgDataFile;
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32 import org.tmatesoft.hg.repo.HgInternals;
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33 import org.tmatesoft.hg.repo.HgRepository;
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34 import org.tmatesoft.hg.repo.HgRuntimeException;
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35 import org.tmatesoft.hg.repo.HgStatusCollector.Record;
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36 import org.tmatesoft.hg.repo.HgWorkingCopyStatusCollector;
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37 import org.tmatesoft.hg.util.CancelledException;
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38 import org.tmatesoft.hg.util.Outcome;
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39 import org.tmatesoft.hg.util.Outcome.Kind;
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40 import org.tmatesoft.hg.util.Pair;
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41 import org.tmatesoft.hg.util.Path;
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42
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43 /**
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44 * WORK IN PROGRESS. UNSTABLE API
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45 *
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46 * 'hg commit' counterpart, commit changes
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47 *
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48 * @author Artem Tikhomirov
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49 * @author TMate Software Ltd.
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50 */
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51 @Experimental(reason="Work in progress. Unstable API")
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52 public class HgCommitCommand extends HgAbstractCommand<HgCommitCommand> {
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53
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54 private final HgRepository repo;
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55 private String message;
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56 private String user;
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57 // nodeid of newly added revision
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58 private Nodeid newRevision;
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59
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60 public HgCommitCommand(HgRepository hgRepo) {
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61 repo = hgRepo;
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62 }
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63
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64
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65 public HgCommitCommand message(String msg) {
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66 message = msg;
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67 return this;
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68 }
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69
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70 public HgCommitCommand user(String userName) {
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71 user = userName;
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72 return this;
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73 }
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74
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75 /**
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76 * Tell if changes in the working directory constitute merge commit. May be invoked prior to (and independently from) {@link #execute()}
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77 *
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78 * @return <code>true</code> if working directory changes are result of a merge
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79 * @throws HgException subclass thereof to indicate specific issue with the repository
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80 */
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81 public boolean isMergeCommit() throws HgException {
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82 int[] parents = new int[2];
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83 detectParentFromDirstate(parents);
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84 return parents[0] != NO_REVISION && parents[1] != NO_REVISION;
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85 }
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86
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87 /**
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88 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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89 * @throws IOException propagated IO errors from status walker over working directory
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90 * @throws CancelledException if execution of the command was cancelled
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91 */
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92 public Outcome execute() throws HgException, IOException, CancelledException {
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93 if (message == null) {
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94 throw new HgBadArgumentException("Shall supply commit message", null);
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95 }
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96 try {
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97 int[] parentRevs = new int[2];
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98 detectParentFromDirstate(parentRevs);
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99 if (parentRevs[0] != NO_REVISION && parentRevs[1] != NO_REVISION) {
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100 throw new HgBadArgumentException("Sorry, I'm not yet smart enough to perform merge commits", null);
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101 }
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102 HgWorkingCopyStatusCollector sc = new HgWorkingCopyStatusCollector(repo);
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103 Record status = sc.status(HgRepository.WORKING_COPY);
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104 if (status.getModified().size() == 0 && status.getAdded().size() == 0 && status.getRemoved().size() == 0) {
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105 newRevision = Nodeid.NULL;
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106 return new Outcome(Kind.Failure, "nothing to add");
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107 }
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108 CommitFacility cf = new CommitFacility(Internals.getInstance(repo), parentRevs[0], parentRevs[1]);
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109 for (Path m : status.getModified()) {
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110 HgDataFile df = repo.getFileNode(m);
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111 cf.add(df, new WorkingCopyContent(df));
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112 }
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113 ArrayList<FileContentSupplier> toClear = new ArrayList<FileContentSupplier>();
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114 for (Path a : status.getAdded()) {
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115 HgDataFile df = repo.getFileNode(a); // TODO need smth explicit, like repo.createNewFileNode(Path) here
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116 // XXX might be an interesting exercise not to demand a content supplier, but instead return a "DataRequester"
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117 // object, that would indicate interest in data, and this code would "push" it to requester, so that any exception
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118 // is handled here, right away, and won't need to travel supplier and CommitFacility. (although try/catch inside
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119 // supplier.read (with empty throws declaration)
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120 FileContentSupplier fcs = new FileContentSupplier(repo, a);
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121 cf.add(df, fcs);
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122 toClear.add(fcs);
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123 }
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124 for (Path r : status.getRemoved()) {
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125 HgDataFile df = repo.getFileNode(r);
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126 cf.forget(df);
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127 }
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128 cf.branch(detectBranch());
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129 cf.user(detectUser());
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130 newRevision = cf.commit(message);
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131 // TODO toClear list is awful
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132 for (FileContentSupplier fcs : toClear) {
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133 fcs.done();
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134 }
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135 return new Outcome(Kind.Success, "Commit ok");
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136 } catch (HgRuntimeException ex) {
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137 throw new HgLibraryFailureException(ex);
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138 }
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139 }
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140
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141 public Nodeid getCommittedRevision() {
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142 if (newRevision == null) {
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143 throw new IllegalStateException("Call #execute() first!");
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144 }
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145 return newRevision;
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146 }
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147
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148 private String detectBranch() {
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149 return repo.getWorkingCopyBranchName();
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150 }
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151
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152 private String detectUser() {
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153 if (user != null) {
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154 return user;
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155 }
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156 // TODO HgInternals is odd place for getNextCommitUsername()
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157 return new HgInternals(repo).getNextCommitUsername();
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158 }
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159
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160 private void detectParentFromDirstate(int[] parents) {
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161 Pair<Nodeid, Nodeid> pn = repo.getWorkingCopyParents();
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162 HgChangelog clog = repo.getChangelog();
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163 parents[0] = pn.first().isNull() ? NO_REVISION : clog.getRevisionIndex(pn.first());
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164 parents[1] = pn.second().isNull() ? NO_REVISION : clog.getRevisionIndex(pn.second());
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165 }
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166
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diff changeset
167 private static class WorkingCopyContent implements CommitFacility.ByteDataSupplier {
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168 private final HgDataFile file;
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169 private ByteBuffer fileContent;
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170
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171 public WorkingCopyContent(HgDataFile dataFile) {
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172 file = dataFile;
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173 if (!dataFile.exists()) {
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174 throw new IllegalArgumentException();
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parents:
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175 }
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parents:
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176 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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177
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178 public int read(ByteBuffer dst) {
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179 if (fileContent == null) {
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180 try {
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parents:
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181 ByteArrayChannel sink = new ByteArrayChannel();
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parents:
diff changeset
182 // TODO desperately need partial read here
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183 file.workingCopy(sink);
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184 fileContent = ByteBuffer.wrap(sink.toArray());
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parents:
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185 } catch (CancelledException ex) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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186 // ByteArrayChannel doesn't cancel, never happens
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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187 assert false;
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188 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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189 }
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parents:
diff changeset
190 if (fileContent.remaining() == 0) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
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191 return -1;
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
192 }
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
193 int dstCap = dst.remaining();
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
194 if (fileContent.remaining() > dstCap) {
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
195 // save actual limit, and pretend we've got exactly desired amount of bytes
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parents:
diff changeset
196 final int lim = fileContent.limit();
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parents:
diff changeset
197 fileContent.limit(dstCap);
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
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diff changeset
198 dst.put(fileContent);
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parents:
diff changeset
199 fileContent.limit(lim);
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
200 } else {
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
201 dst.put(fileContent);
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
202 }
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
203 return dstCap - dst.remaining();
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
204 }
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Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
205 }
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
206 }