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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
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22 import org.tmatesoft.hg.core.HgIOException;
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23 import org.tmatesoft.hg.core.SessionContext;
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24 import org.tmatesoft.hg.repo.HgInvalidStateException;
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25
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26 /**
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27 * Implementation strategies possible:<ul>
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28 * <li> Get a copy, write changes to origin, keep copy as backup till #commit
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29 * <p>(-) doesn't break hard links
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30 * <li> Get a copy, write changes to a copy, on commit rename copy to origin.
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31 * <p>(-) What if we read newly written data (won't find it);
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32 * <p>(-) complex #commit
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33 * <p>(+) simple rollback
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34 * <li> Get a copy, rename origin to backup (breaks hard links), rename copy to origin, write changes
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35 * <p>(+) Modified file is in place right away;
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36 * <p>(+) easy #commit
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37 * <li> Do not copy, just record file size, truncate to that size on rollback
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38 * <li> ...?
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39 * </ul>
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40 * @author Artem Tikhomirov
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41 * @author TMate Software Ltd.
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42 */
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43 public abstract class Transaction {
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44 /**
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45 * Record the file is going to be modified during this transaction, obtain actual
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46 * destination to write to.
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47 */
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48 public abstract File prepare(File f) throws HgIOException;
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49 /**
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50 * overwrites backup if exists, backup is kept after successful {@link #commit()}
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51 */
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52 public abstract File prepare(File origin, File backup) throws HgIOException;
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53 /**
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54 * Tell that file was successfully processed
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55 */
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56 public abstract void done(File f) throws HgIOException;
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57 /**
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58 * optional?
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59 */
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60 public abstract void failure(File f, IOException ex);
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61 /**
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62 * Complete the transaction
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63 */
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64 public abstract void commit() throws HgIOException;
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65 /**
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66 * Undo all the changes
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67 */
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68 public abstract void rollback() throws HgIOException;
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69
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70 public interface Factory {
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71 public Transaction create(SessionContext.Source ctxSource);
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72 }
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73
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74 public static class NoRollback extends Transaction {
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75
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76 @Override
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77 public File prepare(File f) throws HgIOException {
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78 return f;
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79 }
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80
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81 @Override
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82 public File prepare(File origin, File backup) throws HgIOException {
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83 return origin;
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84 }
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85
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86 @Override
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87 public void done(File f) throws HgIOException {
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88 // no-op
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89 }
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90
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91 @Override
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92 public void failure(File f, IOException ex) {
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93 // no-op
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94 }
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95
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96 @Override
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97 public void commit() throws HgIOException {
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98 // no-op
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99 }
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100
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101 @Override
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102 public void rollback() throws HgIOException {
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103 throw new HgInvalidStateException("This transaction doesn't support rollback");
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104 }
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105 }
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106 }