Upstream version 7.36.149.0
[platform/framework/web/crosswalk.git] / src / sync / engine / directory_update_handler.h
1 // Copyright 2014 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 SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
6 #define SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
7
8 #include <map>
9
10 #include "base/basictypes.h"
11 #include "base/memory/ref_counted.h"
12 #include "base/memory/scoped_ptr.h"
13 #include "sync/base/sync_export.h"
14 #include "sync/engine/process_updates_util.h"
15 #include "sync/engine/update_handler.h"
16 #include "sync/internal_api/public/base/model_type.h"
17 #include "sync/internal_api/public/util/syncer_error.h"
18
19 namespace sync_pb {
20 class DataTypeProgressMarker;
21 class GarbageCollectionDirective;
22 class GetUpdatesResponse;
23 }
24
25 namespace syncer {
26
27 namespace sessions {
28 class StatusController;
29 }
30
31 namespace syncable {
32 class Directory;
33 }
34
35 class DirectoryTypeDebugInfoEmitter;
36 class ModelSafeWorker;
37
38 // This class represents the syncable::Directory's processes for requesting and
39 // processing updates from the sync server.
40 //
41 // Each instance of this class represents a particular type in the
42 // syncable::Directory.  It can store and retreive that type's progress markers.
43 // It can also process a set of received SyncEntities and store their data.
44 class SYNC_EXPORT_PRIVATE DirectoryUpdateHandler : public UpdateHandler {
45  public:
46   DirectoryUpdateHandler(syncable::Directory* dir,
47                          ModelType type,
48                          scoped_refptr<ModelSafeWorker> worker,
49                          DirectoryTypeDebugInfoEmitter* debug_info_emitter);
50   virtual ~DirectoryUpdateHandler();
51
52   // UpdateHandler implementation.
53   virtual void GetDownloadProgress(
54       sync_pb::DataTypeProgressMarker* progress_marker) const OVERRIDE;
55   virtual void GetDataTypeContext(sync_pb::DataTypeContext* context) const
56       OVERRIDE;
57   virtual SyncerError ProcessGetUpdatesResponse(
58       const sync_pb::DataTypeProgressMarker& progress_marker,
59       const sync_pb::DataTypeContext& mutated_context,
60       const SyncEntityList& applicable_updates,
61       sessions::StatusController* status) OVERRIDE;
62   virtual void ApplyUpdates(sessions::StatusController* status) OVERRIDE;
63   virtual void PassiveApplyUpdates(sessions::StatusController* status) OVERRIDE;
64
65  private:
66   friend class DirectoryUpdateHandlerApplyUpdateTest;
67   friend class DirectoryUpdateHandlerProcessUpdateTest;
68
69   // Sometimes there is nothing to do, so we can return without doing anything.
70   bool IsApplyUpdatesRequired();
71
72   // Processes the given SyncEntities and stores their data in the directory.
73   // Their types must match this update handler's type.
74   void UpdateSyncEntities(
75       syncable::ModelNeutralWriteTransaction* trans,
76       const SyncEntityList& applicable_updates,
77       sessions::StatusController* status);
78
79   // Expires entries according to GC directives.
80   void ExpireEntriesIfNeeded(
81       syncable::ModelNeutralWriteTransaction* trans,
82       const sync_pb::DataTypeProgressMarker& progress_marker);
83
84   // Stores the given progress marker in the directory.
85   // Its type must match this update handler's type.
86   void UpdateProgressMarker(
87       const sync_pb::DataTypeProgressMarker& progress_marker);
88
89   bool IsValidProgressMarker(
90       const sync_pb::DataTypeProgressMarker& progress_marker) const;
91
92   // Skips all checks and goes straight to applying the updates.
93   SyncerError ApplyUpdatesImpl(sessions::StatusController* status);
94
95   syncable::Directory* dir_;
96   ModelType type_;
97   scoped_refptr<ModelSafeWorker> worker_;
98   DirectoryTypeDebugInfoEmitter* debug_info_emitter_;
99
100   scoped_ptr<sync_pb::GarbageCollectionDirective> cached_gc_directive_;
101
102   DISALLOW_COPY_AND_ASSIGN(DirectoryUpdateHandler);
103 };
104
105 }  // namespace syncer
106
107 #endif  // SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_