Upstream version 9.38.198.0
[platform/framework/web/crosswalk.git] / src / components / bookmarks / browser / bookmark_storage.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 COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_STORAGE_H_
6 #define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_STORAGE_H_
7
8 #include "base/callback_forward.h"
9 #include "base/files/file_path.h"
10 #include "base/files/important_file_writer.h"
11 #include "base/memory/ref_counted.h"
12 #include "base/memory/scoped_ptr.h"
13 #include "base/memory/scoped_vector.h"
14 #include "base/memory/weak_ptr.h"
15 #include "components/bookmarks/browser/bookmark_node.h"
16
17 class BookmarkModel;
18
19 namespace base {
20 class SequencedTaskRunner;
21 }
22
23 namespace bookmarks {
24
25 class BookmarkIndex;
26
27 // A list of BookmarkPermanentNodes that owns them.
28 typedef ScopedVector<BookmarkPermanentNode> BookmarkPermanentNodeList;
29
30 // A callback that generates a BookmarkPermanentNodeList, given a max ID to
31 // use. The max ID argument will be updated after any new nodes have been
32 // created and assigned IDs.
33 typedef base::Callback<BookmarkPermanentNodeList(int64*)> LoadExtraCallback;
34
35 // BookmarkLoadDetails is used by BookmarkStorage when loading bookmarks.
36 // BookmarkModel creates a BookmarkLoadDetails and passes it (including
37 // ownership) to BookmarkStorage. BookmarkStorage loads the bookmarks (and
38 // index) in the background thread, then calls back to the BookmarkModel (on
39 // the main thread) when loading is done, passing ownership back to the
40 // BookmarkModel. While loading BookmarkModel does not maintain references to
41 // the contents of the BookmarkLoadDetails, this ensures we don't have any
42 // threading problems.
43 class BookmarkLoadDetails {
44  public:
45   BookmarkLoadDetails(BookmarkPermanentNode* bb_node,
46                       BookmarkPermanentNode* other_folder_node,
47                       BookmarkPermanentNode* mobile_folder_node,
48                       const LoadExtraCallback& load_extra_callback,
49                       BookmarkIndex* index,
50                       int64 max_id);
51   ~BookmarkLoadDetails();
52
53   void LoadExtraNodes();
54
55   BookmarkPermanentNode* bb_node() { return bb_node_.get(); }
56   BookmarkPermanentNode* release_bb_node() { return bb_node_.release(); }
57   BookmarkPermanentNode* mobile_folder_node() {
58     return mobile_folder_node_.get();
59   }
60   BookmarkPermanentNode* release_mobile_folder_node() {
61     return mobile_folder_node_.release();
62   }
63   BookmarkPermanentNode* other_folder_node() {
64     return other_folder_node_.get();
65   }
66   BookmarkPermanentNode* release_other_folder_node() {
67     return other_folder_node_.release();
68   }
69   const BookmarkPermanentNodeList& extra_nodes() {
70     return extra_nodes_;
71   }
72   void release_extra_nodes(std::vector<BookmarkPermanentNode*>* extra_nodes) {
73     extra_nodes_.release(extra_nodes);
74   }
75   BookmarkIndex* index() { return index_.get(); }
76   BookmarkIndex* release_index() { return index_.release(); }
77
78   const BookmarkNode::MetaInfoMap& model_meta_info_map() const {
79     return model_meta_info_map_;
80   }
81   void set_model_meta_info_map(const BookmarkNode::MetaInfoMap& meta_info_map) {
82     model_meta_info_map_ = meta_info_map;
83   }
84
85   int64 model_sync_transaction_version() const {
86     return model_sync_transaction_version_;
87   }
88   void set_model_sync_transaction_version(int64 sync_transaction_version) {
89     model_sync_transaction_version_ = sync_transaction_version;
90   }
91
92   // Max id of the nodes.
93   void set_max_id(int64 max_id) { max_id_ = max_id; }
94   int64 max_id() const { return max_id_; }
95
96   // Computed checksum.
97   void set_computed_checksum(const std::string& value) {
98     computed_checksum_ = value;
99   }
100   const std::string& computed_checksum() const { return computed_checksum_; }
101
102   // Stored checksum.
103   void set_stored_checksum(const std::string& value) {
104     stored_checksum_ = value;
105   }
106   const std::string& stored_checksum() const { return stored_checksum_; }
107
108   // Whether ids were reassigned. IDs are reassigned during decoding if the
109   // checksum of the file doesn't match, some IDs are missing or not
110   // unique. Basically, if the user modified the bookmarks directly we'll
111   // reassign the ids to ensure they are unique.
112   void set_ids_reassigned(bool value) { ids_reassigned_ = value; }
113   bool ids_reassigned() const { return ids_reassigned_; }
114
115  private:
116   scoped_ptr<BookmarkPermanentNode> bb_node_;
117   scoped_ptr<BookmarkPermanentNode> other_folder_node_;
118   scoped_ptr<BookmarkPermanentNode> mobile_folder_node_;
119   LoadExtraCallback load_extra_callback_;
120   BookmarkPermanentNodeList extra_nodes_;
121   scoped_ptr<BookmarkIndex> index_;
122   BookmarkNode::MetaInfoMap model_meta_info_map_;
123   int64 model_sync_transaction_version_;
124   int64 max_id_;
125   std::string computed_checksum_;
126   std::string stored_checksum_;
127   bool ids_reassigned_;
128
129   DISALLOW_COPY_AND_ASSIGN(BookmarkLoadDetails);
130 };
131
132 // BookmarkStorage handles reading/write the bookmark bar model. The
133 // BookmarkModel uses the BookmarkStorage to load bookmarks from disk, as well
134 // as notifying the BookmarkStorage every time the model changes.
135 //
136 // Internally BookmarkStorage uses BookmarkCodec to do the actual read/write.
137 class BookmarkStorage : public base::ImportantFileWriter::DataSerializer {
138  public:
139   // Creates a BookmarkStorage for the specified model. The data will be loaded
140   // from and saved to a location derived from |profile_path|. The IO code will
141   // be executed as a task in |sequenced_task_runner|.
142   BookmarkStorage(BookmarkModel* model,
143                   const base::FilePath& profile_path,
144                   base::SequencedTaskRunner* sequenced_task_runner);
145   virtual ~BookmarkStorage();
146
147   // Loads the bookmarks into the model, notifying the model when done. This
148   // takes ownership of |details| and send the |OnLoadFinished| callback from
149   // a task in |task_runner|. See BookmarkLoadDetails for details.
150   void LoadBookmarks(
151       scoped_ptr<BookmarkLoadDetails> details,
152       const scoped_refptr<base::SequencedTaskRunner>& task_runner);
153
154   // Schedules saving the bookmark bar model to disk.
155   void ScheduleSave();
156
157   // Notification the bookmark bar model is going to be deleted. If there is
158   // a pending save, it is saved immediately.
159   void BookmarkModelDeleted();
160
161   // Callback from backend after loading the bookmark file.
162   void OnLoadFinished(scoped_ptr<BookmarkLoadDetails> details);
163
164   // ImportantFileWriter::DataSerializer implementation.
165   virtual bool SerializeData(std::string* output) OVERRIDE;
166
167  private:
168   // Serializes the data and schedules save using ImportantFileWriter.
169   // Returns true on successful serialization.
170   bool SaveNow();
171
172   // The model. The model is NULL once BookmarkModelDeleted has been invoked.
173   BookmarkModel* model_;
174
175   // Helper to write bookmark data safely.
176   base::ImportantFileWriter writer_;
177
178   // Sequenced task runner where file I/O operations will be performed at.
179   scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner_;
180
181   base::WeakPtrFactory<BookmarkStorage> weak_factory_;
182
183   DISALLOW_COPY_AND_ASSIGN(BookmarkStorage);
184 };
185
186 }  // namespace bookmarks
187
188 #endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_STORAGE_H_