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annotate src/org/tmatesoft/hg/core/HgCommitCommand.java @ 617:65c01508f002

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Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Wed, 15 May 2013 20:10:09 +0200
parents e447384f3771
children 7c0d2ce340b8
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.COWTransaction;
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27 import org.tmatesoft.hg.internal.CommitFacility;
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28 import org.tmatesoft.hg.internal.CompleteRepoLock;
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29 import org.tmatesoft.hg.internal.Experimental;
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30 import org.tmatesoft.hg.internal.FileContentSupplier;
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31 import org.tmatesoft.hg.internal.Internals;
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32 import org.tmatesoft.hg.internal.Transaction;
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33 import org.tmatesoft.hg.repo.HgChangelog;
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34 import org.tmatesoft.hg.repo.HgDataFile;
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35 import org.tmatesoft.hg.repo.HgInternals;
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36 import org.tmatesoft.hg.repo.HgRepository;
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37 import org.tmatesoft.hg.repo.HgRuntimeException;
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38 import org.tmatesoft.hg.repo.HgStatusCollector.Record;
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39 import org.tmatesoft.hg.repo.HgWorkingCopyStatusCollector;
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40 import org.tmatesoft.hg.util.CancelledException;
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41 import org.tmatesoft.hg.util.Outcome;
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42 import org.tmatesoft.hg.util.Outcome.Kind;
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43 import org.tmatesoft.hg.util.Pair;
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44 import org.tmatesoft.hg.util.Path;
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45
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46 /**
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47 * WORK IN PROGRESS. UNSTABLE API
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48 *
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49 * 'hg commit' counterpart, commit changes
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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. Unstable API")
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55 public class HgCommitCommand extends HgAbstractCommand<HgCommitCommand> {
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56
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57 private final HgRepository repo;
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58 private String message;
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59 private String user;
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60 // nodeid of newly added revision
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61 private Nodeid newRevision;
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62
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63 public HgCommitCommand(HgRepository hgRepo) {
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64 repo = hgRepo;
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65 }
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66
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67
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68 public HgCommitCommand message(String msg) {
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69 message = msg;
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70 return this;
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71 }
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72
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73 public HgCommitCommand user(String userName) {
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74 user = userName;
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75 return this;
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76 }
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77
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78 /**
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79 * Tell if changes in the working directory constitute merge commit. May be invoked prior to (and independently from) {@link #execute()}
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80 *
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81 * @return <code>true</code> if working directory changes are result of a merge
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82 * @throws HgException subclass thereof to indicate specific issue with the repository
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83 */
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84 public boolean isMergeCommit() throws HgException {
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85 int[] parents = new int[2];
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86 detectParentFromDirstate(parents);
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87 return parents[0] != NO_REVISION && parents[1] != NO_REVISION;
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88 }
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89
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90 /**
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91 * @throws HgException subclass thereof to indicate specific issue with the command arguments or repository state
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92 * @throws HgRepositoryLockException if failed to lock the repo for modifications
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93 * @throws IOException propagated IO errors from status walker over working directory
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94 * @throws CancelledException if execution of the command was cancelled
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95 */
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96 public Outcome execute() throws HgException, IOException, CancelledException {
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97 if (message == null) {
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98 throw new HgBadArgumentException("Shall supply commit message", null);
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99 }
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100 final CompleteRepoLock repoLock = new CompleteRepoLock(repo);
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101 repoLock.acquire();
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102 try {
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103 int[] parentRevs = new int[2];
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104 detectParentFromDirstate(parentRevs);
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105 if (parentRevs[0] != NO_REVISION && parentRevs[1] != NO_REVISION) {
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106 throw new HgBadArgumentException("Sorry, I'm not yet smart enough to perform merge commits", null);
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107 }
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108 HgWorkingCopyStatusCollector sc = new HgWorkingCopyStatusCollector(repo);
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109 Record status = sc.status(HgRepository.WORKING_COPY);
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110 if (status.getModified().size() == 0 && status.getAdded().size() == 0 && status.getRemoved().size() == 0) {
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111 newRevision = Nodeid.NULL;
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112 return new Outcome(Kind.Failure, "nothing to add");
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113 }
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114 CommitFacility cf = new CommitFacility(Internals.getInstance(repo), parentRevs[0], parentRevs[1]);
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115 for (Path m : status.getModified()) {
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116 HgDataFile df = repo.getFileNode(m);
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117 cf.add(df, new WorkingCopyContent(df));
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118 }
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119 ArrayList<FileContentSupplier> toClear = new ArrayList<FileContentSupplier>();
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120 for (Path a : status.getAdded()) {
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121 HgDataFile df = repo.getFileNode(a); // TODO need smth explicit, like repo.createNewFileNode(Path) here
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122 // XXX might be an interesting exercise not to demand a content supplier, but instead return a "DataRequester"
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123 // object, that would indicate interest in data, and this code would "push" it to requester, so that any exception
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124 // is handled here, right away, and won't need to travel supplier and CommitFacility. (although try/catch inside
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125 // supplier.read (with empty throws declaration)
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126 FileContentSupplier fcs = new FileContentSupplier(repo, a);
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127 cf.add(df, fcs);
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128 toClear.add(fcs);
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129 }
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130 for (Path r : status.getRemoved()) {
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131 HgDataFile df = repo.getFileNode(r);
73c20c648c1f HgCommitCommand initial support
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132 cf.forget(df);
73c20c648c1f HgCommitCommand initial support
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133 }
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134 cf.branch(detectBranch());
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135 cf.user(detectUser());
617
65c01508f002 Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
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parents: 591
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136 Transaction.Factory trFactory = new COWTransaction.Factory();
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diff changeset
137 Transaction tr = trFactory.create(repo);
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138 try {
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139 newRevision = cf.commit(message, tr);
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140 tr.commit();
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diff changeset
141 } catch (RuntimeException ex) {
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142 tr.rollback();
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143 throw ex;
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144 } catch (HgException ex) {
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parents: 591
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145 tr.rollback();
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146 throw ex;
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147 }
586
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148 // TODO toClear list is awful
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149 for (FileContentSupplier fcs : toClear) {
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150 fcs.done();
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151 }
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152 return new Outcome(Kind.Success, "Commit ok");
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153 } catch (HgRuntimeException ex) {
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154 throw new HgLibraryFailureException(ex);
617
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155 } finally {
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diff changeset
156 repoLock.release();
586
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157 }
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158 }
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159
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160 public Nodeid getCommittedRevision() {
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161 if (newRevision == null) {
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162 throw new IllegalStateException("Call #execute() first!");
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163 }
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164 return newRevision;
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165 }
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166
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167 private String detectBranch() {
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168 return repo.getWorkingCopyBranchName();
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169 }
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170
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171 private String detectUser() {
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172 if (user != null) {
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173 return user;
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174 }
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diff changeset
175 // TODO HgInternals is odd place for getNextCommitUsername()
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176 return new HgInternals(repo).getNextCommitUsername();
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177 }
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178
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179 private void detectParentFromDirstate(int[] parents) {
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diff changeset
180 Pair<Nodeid, Nodeid> pn = repo.getWorkingCopyParents();
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diff changeset
181 HgChangelog clog = repo.getChangelog();
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parents:
diff changeset
182 parents[0] = pn.first().isNull() ? NO_REVISION : clog.getRevisionIndex(pn.first());
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
183 parents[1] = pn.second().isNull() ? NO_REVISION : clog.getRevisionIndex(pn.second());
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184 }
73c20c648c1f HgCommitCommand initial support
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diff changeset
185
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diff changeset
186 private static class WorkingCopyContent implements CommitFacility.ByteDataSupplier {
73c20c648c1f HgCommitCommand initial support
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diff changeset
187 private final HgDataFile file;
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diff changeset
188 private ByteBuffer fileContent;
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parents:
diff changeset
189
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diff changeset
190 public WorkingCopyContent(HgDataFile dataFile) {
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diff changeset
191 file = dataFile;
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parents:
diff changeset
192 if (!dataFile.exists()) {
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193 throw new IllegalArgumentException();
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parents:
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194 }
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parents:
diff changeset
195 }
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parents:
diff changeset
196
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diff changeset
197 public int read(ByteBuffer dst) {
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parents:
diff changeset
198 if (fileContent == null) {
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diff changeset
199 try {
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parents:
diff changeset
200 ByteArrayChannel sink = new ByteArrayChannel();
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parents:
diff changeset
201 // TODO desperately need partial read here
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parents:
diff changeset
202 file.workingCopy(sink);
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
203 fileContent = ByteBuffer.wrap(sink.toArray());
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parents:
diff changeset
204 } catch (CancelledException ex) {
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
205 // ByteArrayChannel doesn't cancel, never happens
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
206 assert false;
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
207 }
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
208 }
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
209 if (fileContent.remaining() == 0) {
73c20c648c1f HgCommitCommand initial support
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parents:
diff changeset
210 return -1;
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
211 }
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
212 int dstCap = dst.remaining();
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
213 if (fileContent.remaining() > dstCap) {
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
214 // save actual limit, and pretend we've got exactly desired amount of bytes
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
215 final int lim = fileContent.limit();
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
216 fileContent.limit(dstCap);
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
217 dst.put(fileContent);
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
218 fileContent.limit(lim);
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
219 } else {
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
220 dst.put(fileContent);
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
221 }
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
222 return dstCap - dst.remaining();
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
223 }
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
224 }
73c20c648c1f HgCommitCommand initial support
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff changeset
225 }