chrome/browser/bookmarks/bookmark_storage.h

   1 // Copyright (c) 2011 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_BOOKMARKS_BOOKMARK_STORAGE_H_
   6 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_STORAGE_H_
   7
   8 #include "base/files/important_file_writer.h"
   9 #include "base/memory/ref_counted.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "chrome/browser/bookmarks/bookmark_model.h"
  12
  13 class BookmarkIndex;
  14 class BookmarkModel;
  15 class BookmarkPermanentNode;
  16
  17 namespace base {
  18 class SequencedTaskRunner;
  19 }
  20
  21 namespace content {
  22 class BrowserContext;
  23 }
  24
  25 // BookmarkLoadDetails is used by BookmarkStorage when loading bookmarks.
  26 // BookmarkModel creates a BookmarkLoadDetails and passes it (including
  27 // ownership) to BookmarkStorage. BookmarkStorage loads the bookmarks (and
  28 // index) in the background thread, then calls back to the BookmarkModel (on
  29 // the main thread) when loading is done, passing ownership back to the
  30 // BookmarkModel. While loading BookmarkModel does not maintain references to
  31 // the contents of the BookmarkLoadDetails, this ensures we don't have any
  32 // threading problems.
  33 class BookmarkLoadDetails {
  34  public:
  35   BookmarkLoadDetails(BookmarkPermanentNode* bb_node,
  36                       BookmarkPermanentNode* other_folder_node,
  37                       BookmarkPermanentNode* mobile_folder_node,
  38                       BookmarkIndex* index,
  39                       int64 max_id);
  40   ~BookmarkLoadDetails();
  41
  42   BookmarkPermanentNode* bb_node() { return bb_node_.get(); }
  43   BookmarkPermanentNode* release_bb_node() { return bb_node_.release(); }
  44   BookmarkPermanentNode* mobile_folder_node() {
  45     return mobile_folder_node_.get();
  46   }
  47   BookmarkPermanentNode* release_mobile_folder_node() {
  48     return mobile_folder_node_.release();
  49   }
  50   BookmarkPermanentNode* other_folder_node() {
  51     return other_folder_node_.get();
  52   }
  53   BookmarkPermanentNode* release_other_folder_node() {
  54     return other_folder_node_.release();
  55   }
  56   BookmarkIndex* index() { return index_.get(); }
  57   BookmarkIndex* release_index() { return index_.release(); }
  58
  59   const BookmarkNode::MetaInfoMap& model_meta_info_map() const {
  60     return model_meta_info_map_;
  61   }
  62   void set_model_meta_info_map(const BookmarkNode::MetaInfoMap& meta_info_map) {
  63     model_meta_info_map_ = meta_info_map;
  64   }
  65
  66   int64 model_sync_transaction_version() const {
  67     return model_sync_transaction_version_;
  68   }
  69   void set_model_sync_transaction_version(int64 sync_transaction_version) {
  70     model_sync_transaction_version_ = sync_transaction_version;
  71   }
  72
  73   // Max id of the nodes.
  74   void set_max_id(int64 max_id) { max_id_ = max_id; }
  75   int64 max_id() const { return max_id_; }
  76
  77   // Computed checksum.
  78   void set_computed_checksum(const std::string& value) {
  79     computed_checksum_ = value;
  80   }
  81   const std::string& computed_checksum() const { return computed_checksum_; }
  82
  83   // Stored checksum.
  84   void set_stored_checksum(const std::string& value) {
  85     stored_checksum_ = value;
  86   }
  87   const std::string& stored_checksum() const { return stored_checksum_; }
  88
  89   // Whether ids were reassigned. IDs are reassigned during decoding if the
  90   // checksum of the file doesn't match, some IDs are missing or not
  91   // unique. Basically, if the user modified the bookmarks directly we'll
  92   // reassign the ids to ensure they are unique.
  93   void set_ids_reassigned(bool value) { ids_reassigned_ = value; }
  94   bool ids_reassigned() const { return ids_reassigned_; }
  95
  96  private:
  97   scoped_ptr<BookmarkPermanentNode> bb_node_;
  98   scoped_ptr<BookmarkPermanentNode> other_folder_node_;
  99   scoped_ptr<BookmarkPermanentNode> mobile_folder_node_;
 100   scoped_ptr<BookmarkIndex> index_;
 101   BookmarkNode::MetaInfoMap model_meta_info_map_;
 102   int64 model_sync_transaction_version_;
 103   int64 max_id_;
 104   std::string computed_checksum_;
 105   std::string stored_checksum_;
 106   bool ids_reassigned_;
 107
 108   DISALLOW_COPY_AND_ASSIGN(BookmarkLoadDetails);
 109 };
 110
 111 // BookmarkStorage handles reading/write the bookmark bar model. The
 112 // BookmarkModel uses the BookmarkStorage to load bookmarks from disk, as well
 113 // as notifying the BookmarkStorage every time the model changes.
 114 //
 115 // Internally BookmarkStorage uses BookmarkCodec to do the actual read/write.
 116 class BookmarkStorage : public base::ImportantFileWriter::DataSerializer,
 117                         public base::RefCountedThreadSafe<BookmarkStorage> {
 118  public:
 119   // Creates a BookmarkStorage for the specified model
 120   BookmarkStorage(content::BrowserContext* context,
 121                   BookmarkModel* model,
 122                   base::SequencedTaskRunner* sequenced_task_runner);
 123
 124   // Loads the bookmarks into the model, notifying the model when done. This
 125   // takes ownership of |details|. See BookmarkLoadDetails for details.
 126   void LoadBookmarks(BookmarkLoadDetails* details);
 127
 128   // Schedules saving the bookmark bar model to disk.
 129   void ScheduleSave();
 130
 131   // Notification the bookmark bar model is going to be deleted. If there is
 132   // a pending save, it is saved immediately.
 133   void BookmarkModelDeleted();
 134
 135   // Callback from backend after loading the bookmark file.
 136   void OnLoadFinished();
 137
 138   // ImportantFileWriter::DataSerializer implementation.
 139   virtual bool SerializeData(std::string* output) OVERRIDE;
 140
 141  private:
 142   friend class base::RefCountedThreadSafe<BookmarkStorage>;
 143
 144   virtual ~BookmarkStorage();
 145
 146   // Serializes the data and schedules save using ImportantFileWriter.
 147   // Returns true on successful serialization.
 148   bool SaveNow();
 149
 150   // The model. The model is NULL once BookmarkModelDeleted has been invoked.
 151   BookmarkModel* model_;
 152
 153   // Helper to write bookmark data safely.
 154   base::ImportantFileWriter writer_;
 155
 156   // See class description of BookmarkLoadDetails for details on this.
 157   scoped_ptr<BookmarkLoadDetails> details_;
 158
 159   // Sequenced task runner where file I/O operations will be performed at.
 160   scoped_refptr<base::SequencedTaskRunner> sequenced_task_runner_;
 161
 162   DISALLOW_COPY_AND_ASSIGN(BookmarkStorage);
 163 };
 164
 165 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_STORAGE_H_