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annotate src/org/tmatesoft/hg/internal/COWTransaction.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
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children 99ad1e3a4e4d
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617
65c01508f002 Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
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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 java.io.File;
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20 import java.io.IOException;
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21 import java.util.Iterator;
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22 import java.util.LinkedList;
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23 import java.util.List;
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24
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25 import org.tmatesoft.hg.core.HgIOException;
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26 import org.tmatesoft.hg.core.SessionContext;
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27
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28 /**
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29 * This transaction strategy makes a copy of original file and breaks origin hard links, if any.
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30 * Changes are directed to actual repository files.
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31 *
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32 * On commit, remove all backup copies
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33 * On rollback, move all backup files in place of original
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34 *
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35 * @author Artem Tikhomirov
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36 * @author TMate Software Ltd.
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37 */
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38 public final class COWTransaction extends Transaction {
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39
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40 private final FileUtils fileHelper;
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41 private final List<RollbackEntry> entries = new LinkedList<RollbackEntry>();
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42
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43 public COWTransaction(SessionContext.Source ctxSource) {
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44 fileHelper = new FileUtils(ctxSource.getSessionContext().getLog());
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45 }
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46
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47 @Override
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48 public File prepare(File f) throws HgIOException {
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49 if (!f.exists()) {
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50 record(f, null);
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51 return f;
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52 }
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53 if (known(f)) {
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54 return f;
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55 }
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56 final File parentDir = f.getParentFile();
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57 assert parentDir.canWrite();
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58 File copy = new File(parentDir, f.getName() + ".hg4j.copy");
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59 fileHelper.copy(f, copy);
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60 final long lm = f.lastModified();
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61 copy.setLastModified(lm);
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62 File backup = new File(parentDir, f.getName() + ".hg4j.orig");
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63 if (backup.exists()) {
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64 backup.delete();
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65 }
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66 if (!f.renameTo(backup)) {
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67 throw new HgIOException(String.format("Failed to backup %s to %s", f.getName(), backup.getName()), backup);
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68 }
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69 if (!copy.renameTo(f)) {
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70 throw new HgIOException(String.format("Failed to bring on-write copy in place (%s to %s)", copy.getName(), f.getName()), copy);
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71 }
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72 f.setLastModified(lm);
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73 record(f, backup);
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74 return f;
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75 }
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76
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77 @Override
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78 public File prepare(File origin, File backup) throws HgIOException {
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79 if (known(origin)) {
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80 return origin;
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81 }
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82 fileHelper.copy(origin, backup);
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83 final RollbackEntry e = record(origin, backup);
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84 e.keepBackup = true;
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85 return origin;
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86 }
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87
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88 @Override
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89 public void done(File f) throws HgIOException {
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90 find(f).success = true;
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91 }
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92
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93 @Override
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94 public void failure(File f, IOException ex) {
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95 find(f).failure = ex;
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96 }
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97
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98 // XXX custom exception for commit and rollback to hold information about files rolled back
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99
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100 @Override
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101 public void commit() throws HgIOException {
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102 for (Iterator<RollbackEntry> it = entries.iterator(); it.hasNext();) {
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103 RollbackEntry e = it.next();
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104 assert e.success;
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105 if (e.failure != null) {
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106 throw new HgIOException("Can't close transaction with a failure.", e.failure, e.origin);
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107 }
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108 if (!e.keepBackup && e.backup != null) {
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109 e.backup.delete();
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110 }
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111 it.remove();
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112 }
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113 }
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114
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115 @Override
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116 public void rollback() throws HgIOException {
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117 LinkedList<RollbackEntry> success = new LinkedList<RollbackEntry>();
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118 for (Iterator<RollbackEntry> it = entries.iterator(); it.hasNext();) {
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119 RollbackEntry e = it.next();
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120 e.origin.delete();
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121 if (e.backup != null) {
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122 if (!e.backup.renameTo(e.origin)) {
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123 String msg = String.format("Transaction rollback failed, could not rename backup %s back to %s", e.backup.getName(), e.origin.getName());
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124 throw new HgIOException(msg, e.origin);
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125 }
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126 }
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127 success.add(e);
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128 it.remove();
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129 }
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130 }
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131
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132 private RollbackEntry record(File origin, File backup) {
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133 final RollbackEntry e = new RollbackEntry(origin, backup);
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134 entries.add(e);
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135 return e;
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136 }
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137
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138 private boolean known(File f) {
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139 for (RollbackEntry e : entries) {
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140 if (e.origin.equals(f)) {
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141 return true;
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142 }
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143 }
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144 return false;
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145 }
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146 private RollbackEntry find(File f) {
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147 for (RollbackEntry e : entries) {
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148 if (e.origin.equals(f)) {
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149 return e;
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150 }
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151 }
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152 assert false;
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153 return new RollbackEntry(f,f);
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154 }
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155
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156 private static class RollbackEntry {
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157 public final File origin;
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158 public final File backup; // may be null to indicate file didn't exist
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159 public boolean success = false;
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160 public IOException failure = null;
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161 public boolean keepBackup = false;
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162
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163 public RollbackEntry(File o, File b) {
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164 origin = o;
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165 backup = b;
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166 }
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167 }
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168
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169 public static class Factory implements Transaction.Factory {
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170
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171 public Transaction create(SessionContext.Source ctxSource) {
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172 return new COWTransaction(ctxSource);
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173 }
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174
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175 }
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176 }