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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
// 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.
//
// An UpdateApplicator is used to iterate over a number of unapplied updates,
// applying them to the client using the given syncer session.
//
// UpdateApplicator might resemble an iterator, but it actually keeps retrying
// failed updates until no remaining updates can be successfully applied.
#ifndef SYNC_ENGINE_UPDATE_APPLICATOR_H_
#define SYNC_ENGINE_UPDATE_APPLICATOR_H_
#pragma once
#include <vector>
#include "base/basictypes.h"
#include "base/port.h"
#include "sync/internal_api/public/engine/model_safe_worker.h"
#include "sync/syncable/syncable.h"
namespace browser_sync {
namespace sessions {
class ConflictProgress;
class UpdateProgress;
}
class ConflictResolver;
class Cryptographer;
class UpdateApplicator {
public:
typedef std::vector<int64>::iterator UpdateIterator;
UpdateApplicator(ConflictResolver* resolver,
Cryptographer* cryptographer,
const UpdateIterator& begin,
const UpdateIterator& end,
const ModelSafeRoutingInfo& routes,
ModelSafeGroup group_filter);
~UpdateApplicator();
// returns true if there's more we can do.
bool AttemptOneApplication(syncable::WriteTransaction* trans);
// return true if we've applied all updates.
bool AllUpdatesApplied() const;
// This class does not automatically save its progress into the
// SyncSession -- to get that to happen, call this method after update
// application is finished (i.e., when AttemptOneAllocation stops returning
// true).
void SaveProgressIntoSessionState(
sessions::ConflictProgress* conflict_progress,
sessions::UpdateProgress* update_progress);
private:
// Track the status of all applications.
class ResultTracker {
public:
explicit ResultTracker(size_t num_results);
virtual ~ResultTracker();
void AddSimpleConflict(syncable::Id);
void AddEncryptionConflict(syncable::Id);
void AddHierarchyConflict(syncable::Id);
void AddSuccess(syncable::Id);
void SaveProgress(sessions::ConflictProgress* conflict_progress,
sessions::UpdateProgress* update_progress);
void ClearConflicts();
// Returns true iff conflicting_ids_ is empty. Does not check
// encryption_conflict_ids_.
bool no_conflicts() const;
private:
std::vector<syncable::Id> conflicting_ids_;
std::vector<syncable::Id> successful_ids_;
std::vector<syncable::Id> encryption_conflict_ids_;
std::vector<syncable::Id> hierarchy_conflict_ids_;
};
// If true, AttemptOneApplication will skip over |entry| and return true.
bool SkipUpdate(const syncable::Entry& entry);
// Adjusts the UpdateIterator members to move ahead by one update.
void Advance();
// Used to resolve conflicts when trying to apply updates.
ConflictResolver* const resolver_;
// Used to decrypt sensitive sync nodes.
Cryptographer* cryptographer_;
UpdateIterator const begin_;
UpdateIterator end_;
UpdateIterator pointer_;
ModelSafeGroup group_filter_;
bool progress_;
const ModelSafeRoutingInfo routing_info_;
// Track the result of the attempts to update applications.
ResultTracker application_results_;
DISALLOW_COPY_AND_ASSIGN(UpdateApplicator);
};
} // namespace browser_sync
#endif // SYNC_ENGINE_UPDATE_APPLICATOR_H_
|
