conflict_resolver.h revision e5d81f57cb97b3b6b7fccc9c5610d21eb81db09d 
1// Copyright 2013 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#ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_CONFLICT_RESOLVER_H_
6#define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_CONFLICT_RESOLVER_H_
7
8#include <string>
9#include <utility>
10#include <vector>
11
12#include "base/memory/scoped_ptr.h"
13#include "base/memory/weak_ptr.h"
14#include "chrome/browser/sync_file_system/drive_backend/sync_task.h"
15#include "chrome/browser/sync_file_system/sync_callbacks.h"
16#include "google_apis/drive/gdata_errorcode.h"
17
18namespace drive {
19class DriveServiceInterface;
20}
21
22namespace google_apis {
23class ResourceEntry;
24}
25
26namespace sync_file_system {
27namespace drive_backend {
28
29class MetadataDatabase;
30class SyncEngineContext;
31class TrackerIDSet;
32
33// Resolves server side file confliction.
34// If a remote file has an active tracker and multiple managed parents,
35// ConflictResolver detaches the file from all parents other than the parent
36// of the active tracker.
37// If multiple trackers have the same local path or the same remote file,
38// ConflictResolver picks up one of them and delete others.
39class ConflictResolver : public ExclusiveTask {
40 public:
41  typedef std::vector<std::string> FileIDList;
42
43  explicit ConflictResolver(SyncEngineContext* sync_context);
44  virtual ~ConflictResolver();
45  virtual void RunExclusive(const SyncStatusCallback& callback) OVERRIDE;
46
47 private:
48  typedef std::pair<std::string, std::string> FileIDAndETag;
49
50  void DetachFromNonPrimaryParents(const SyncStatusCallback& callback);
51  void DidDetachFromParent(const SyncStatusCallback& callback,
52                           google_apis::GDataErrorCode error);
53
54  std::string PickPrimaryFile(const TrackerIDSet& trackers);
55  void RemoveNonPrimaryFiles(const SyncStatusCallback& callback);
56  void DidRemoveFile(const SyncStatusCallback& callback,
57                     const std::string& file_id,
58                     google_apis::GDataErrorCode error);
59
60  void UpdateFileMetadata(const std::string& file_id,
61                          const SyncStatusCallback& callback);
62  void DidGetRemoteMetadata(const std::string& file_id,
63                            const SyncStatusCallback& callback,
64                            google_apis::GDataErrorCode error,
65                            scoped_ptr<google_apis::ResourceEntry> entry);
66
67  std::string target_file_id_;
68  std::vector<std::string> parents_to_remove_;
69
70  std::vector<FileIDAndETag> non_primary_file_ids_;
71  FileIDList deleted_file_ids_;
72
73  bool IsContextReady();
74  drive::DriveServiceInterface* drive_service();
75  MetadataDatabase* metadata_database();
76
77  SyncEngineContext* sync_context_;  // Not owned.
78
79  base::WeakPtrFactory<ConflictResolver> weak_ptr_factory_;
80
81  DISALLOW_COPY_AND_ASSIGN(ConflictResolver);
82};
83
84}  // namespace drive_backend
85}  // namespace sync_file_system
86
87#endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_CONFLICT_RESOLVER_H_
88