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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 // | |
| 5 // A class that watches the syncer and attempts to resolve any conflicts that | |
| 6 // occur. | |
| 7 | |
| 8 #ifndef CHROME_BROWSER_SYNC_ENGINE_CONFLICT_RESOLVER_H_ | |
| 9 #define CHROME_BROWSER_SYNC_ENGINE_CONFLICT_RESOLVER_H_ | |
| 10 #pragma once | |
| 11 | |
| 12 #include <map> | |
| 13 #include <set> | |
| 14 #include <string> | |
| 15 | |
| 16 #include "base/basictypes.h" | |
| 17 #include "base/gtest_prod_util.h" | |
| 18 #include "chrome/browser/sync/engine/syncer_types.h" | |
| 19 | |
| 20 namespace syncable { | |
| 21 class BaseTransaction; | |
| 22 class Id; | |
| 23 class MutableEntry; | |
| 24 class WriteTransaction; | |
| 25 } // namespace syncable | |
| 26 | |
| 27 namespace browser_sync { | |
| 28 | |
| 29 class Cryptographer; | |
| 30 | |
| 31 namespace sessions { | |
| 32 class ConflictProgress; | |
| 33 class StatusController; | |
| 34 } // namespace sessions | |
| 35 | |
| 36 class ConflictResolver { | |
| 37 friend class SyncerTest; | |
| 38 FRIEND_TEST_ALL_PREFIXES(SyncerTest, | |
| 39 ConflictResolverMergeOverwritesLocalEntry); | |
| 40 public: | |
| 41 // Enumeration of different conflict resolutions. Used for histogramming. | |
| 42 enum SimpleConflictResolutions { | |
| 43 OVERWRITE_LOCAL, // Resolved by overwriting local changes. | |
| 44 OVERWRITE_SERVER, // Resolved by overwriting server changes. | |
| 45 UNDELETE, // Resolved by undeleting local item. | |
| 46 IGNORE_ENCRYPTION, // Resolved by ignoring an encryption-only server | |
| 47 // change. | |
| 48 NIGORI_MERGE, // Resolved by merging nigori nodes. | |
| 49 CHANGES_MATCH, // Resolved by ignoring both local and server | |
| 50 // changes because they matched. | |
| 51 CONFLICT_RESOLUTION_SIZE, | |
| 52 }; | |
| 53 | |
| 54 ConflictResolver(); | |
| 55 ~ConflictResolver(); | |
| 56 // Called by the syncer at the end of a update/commit cycle. | |
| 57 // Returns true if the syncer should try to apply its updates again. | |
| 58 bool ResolveConflicts(syncable::WriteTransaction* trans, | |
| 59 const Cryptographer* cryptographer, | |
| 60 const sessions::ConflictProgress& progress, | |
| 61 sessions::StatusController* status); | |
| 62 | |
| 63 private: | |
| 64 enum ProcessSimpleConflictResult { | |
| 65 NO_SYNC_PROGRESS, // No changes to advance syncing made. | |
| 66 SYNC_PROGRESS, // Progress made. | |
| 67 }; | |
| 68 | |
| 69 void IgnoreLocalChanges(syncable::MutableEntry* entry); | |
| 70 void OverwriteServerChanges(syncable::WriteTransaction* trans, | |
| 71 syncable::MutableEntry* entry); | |
| 72 | |
| 73 ProcessSimpleConflictResult ProcessSimpleConflict( | |
| 74 syncable::WriteTransaction* trans, | |
| 75 const syncable::Id& id, | |
| 76 const Cryptographer* cryptographer, | |
| 77 sessions::StatusController* status); | |
| 78 | |
| 79 bool ResolveSimpleConflicts(syncable::WriteTransaction* trans, | |
| 80 const Cryptographer* cryptographer, | |
| 81 const sessions::ConflictProgress& progress, | |
| 82 sessions::StatusController* status); | |
| 83 | |
| 84 DISALLOW_COPY_AND_ASSIGN(ConflictResolver); | |
| 85 }; | |
| 86 | |
| 87 } // namespace browser_sync | |
| 88 | |
| 89 #endif // CHROME_BROWSER_SYNC_ENGINE_CONFLICT_RESOLVER_H_ | |
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