Mercurial > jhg
annotate src/org/tmatesoft/hg/internal/Transaction.java @ 686:f1f095e42555
Annotated file is not always changed in the latest changeset, need to find out last changest it was changed at (iow, diffed to with BlameHelper)
author | Artem Tikhomirov <tikhomirov.artem@gmail.com> |
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date | Thu, 25 Jul 2013 22:12:14 +0200 (2013-07-25) |
parents | 99ad1e3a4e4d |
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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 * The file to be modified not necessarily exists, might be just a name of an added file |
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48 */ |
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49 public abstract File prepare(File f) throws HgIOException; |
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50 /** |
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51 * overwrites backup if exists, backup is kept after successful {@link #commit()} |
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52 */ |
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53 public abstract File prepare(File origin, File backup) throws HgIOException; |
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54 /** |
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55 * Tell that file was successfully processed |
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56 */ |
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57 public abstract void done(File f) throws HgIOException; |
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58 /** |
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59 * optional? |
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60 */ |
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61 public abstract void failure(File f, IOException ex); |
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62 /** |
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63 * Complete the transaction |
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64 */ |
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65 public abstract void commit() throws HgIOException; |
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66 /** |
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67 * Undo all the changes |
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68 */ |
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69 public abstract void rollback() throws HgIOException; |
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70 |
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71 public interface Factory { |
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72 public Transaction create(SessionContext.Source ctxSource); |
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73 } |
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74 |
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75 public static class NoRollback extends Transaction { |
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76 |
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77 @Override |
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78 public File prepare(File f) throws HgIOException { |
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79 return f; |
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80 } |
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81 |
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82 @Override |
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83 public File prepare(File origin, File backup) throws HgIOException { |
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84 return origin; |
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85 } |
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86 |
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87 @Override |
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88 public void done(File f) throws HgIOException { |
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89 // no-op |
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90 } |
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91 |
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92 @Override |
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93 public void failure(File f, IOException ex) { |
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94 // no-op |
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95 } |
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96 |
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97 @Override |
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98 public void commit() throws HgIOException { |
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99 // no-op |
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100 } |
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101 |
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102 @Override |
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103 public void rollback() throws HgIOException { |
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104 throw new HgInvalidStateException("This transaction doesn't support rollback"); |
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105 } |
65c01508f002
Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
|
106 } |
65c01508f002
Rollback support for commands that modify repository. Strategy to keep complete copy of a file being changed
Artem Tikhomirov <tikhomirov.artem@gmail.com>
parents:
diff
changeset
|
107 } |