1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SYNC_ENGINE_IMPL_CONFLICT_RESOLVER_H_
#define COMPONENTS_SYNC_ENGINE_IMPL_CONFLICT_RESOLVER_H_
#include <set>
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "components/sync/engine_impl/syncer_types.h"
namespace syncer {
namespace syncable {
class Id;
class WriteTransaction;
} // namespace syncable
class Cryptographer;
class StatusController;
struct UpdateCounters;
// A class that watches the syncer and attempts to resolve any conflicts that
// occur.
class ConflictResolver {
public:
// Enumeration of different conflict resolutions. Used for histogramming.
enum SimpleConflictResolutions {
OVERWRITE_LOCAL, // Resolved by overwriting local changes.
OVERWRITE_SERVER, // Resolved by overwriting server changes.
UNDELETE, // Resolved by undeleting local item.
IGNORE_ENCRYPTION, // Resolved by ignoring an encryption-only server
// change.
NIGORI_MERGE, // Resolved by merging nigori nodes.
CHANGES_MATCH, // Resolved by ignoring both local and server
// changes because they matched.
CONFLICT_RESOLUTION_SIZE,
};
ConflictResolver();
~ConflictResolver();
// Called by the syncer at the end of a update/commit cycle.
// Returns true if the syncer should try to apply its updates again.
void ResolveConflicts(syncable::WriteTransaction* trans,
const Cryptographer* cryptographer,
const std::set<syncable::Id>& simple_conflict_ids,
StatusController* status,
UpdateCounters* counters);
private:
friend class SyncerTest;
FRIEND_TEST_ALL_PREFIXES(SyncerTest,
ConflictResolverMergeOverwritesLocalEntry);
void ProcessSimpleConflict(syncable::WriteTransaction* trans,
const syncable::Id& id,
const Cryptographer* cryptographer,
StatusController* status,
UpdateCounters* counters);
DISALLOW_COPY_AND_ASSIGN(ConflictResolver);
};
} // namespace syncer
#endif // COMPONENTS_SYNC_ENGINE_IMPL_CONFLICT_RESOLVER_H_
|
