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// Copyright (c) 2006-2008 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.
#ifndef CHROME_BROWSER_BOOKMARKS_BOOKMARK_STORAGE_H_
#define CHROME_BROWSER_BOOKMARKS_BOOKMARK_STORAGE_H_
#include "base/file_path.h"
#include "base/ref_counted.h"
#include "chrome/common/important_file_writer.h"
#include "chrome/common/notification_observer.h"
#include "chrome/common/notification_registrar.h"
class BookmarkModel;
class Profile;
class Task;
class Value;
namespace base {
class Thread;
}
// BookmarkStorage handles reading/write the bookmark bar model. The
// BookmarkModel uses the BookmarkStorage to load bookmarks from disk, as well
// as notifying the BookmarkStorage every time the model changes.
//
// Internally BookmarkStorage uses BookmarkCodec to do the actual read/write.
class BookmarkStorage : public NotificationObserver,
public ImportantFileWriter::DataSerializer,
public base::RefCountedThreadSafe<BookmarkStorage> {
public:
// Creates a BookmarkStorage for the specified model
BookmarkStorage(Profile* profile, BookmarkModel* model);
~BookmarkStorage();
// Loads the bookmarks into the model, notifying the model when done.
void LoadBookmarks();
// Schedules saving the bookmark bar model to disk.
void ScheduleSave();
// Notification the bookmark bar model is going to be deleted. If there is
// a pending save, it is saved immediately.
void BookmarkModelDeleted();
// ImportantFileWriter::DataSerializer
virtual bool SerializeData(std::string* output);
private:
class LoadTask;
// Callback from backend with the results of the bookmark file.
// This may be called multiple times, with different paths. This happens when
// we migrate bookmark data from database.
void OnLoadFinished(bool file_exists, const FilePath& path,
Value* root_value);
// Loads bookmark data from |file| and notifies the model when finished.
void DoLoadBookmarks(const FilePath& file);
// Load bookmarks data from the file written by history (StarredURLDatabase).
void MigrateFromHistory();
// Called when history has written the file with bookmarks data. Loads data
// from that file.
void OnHistoryFinishedWriting();
// Called after we loaded file generated by history. Saves the data, deletes
// the temporary file, and notifies the model.
void FinishHistoryMigration();
// NotificationObserver
void Observe(NotificationType type, const NotificationSource& source,
const NotificationDetails& details);
// Serializes the data and schedules save using ImportantFileWriter.
// Returns true on successful serialization.
bool SaveNow();
// Runs task on backend thread (or on current thread if backend thread
// is NULL). Takes ownership of |task|.
void RunTaskOnBackendThread(Task* task) const;
// Returns the thread the backend is run on.
const base::Thread* backend_thread() const { return backend_thread_; }
// Keep the pointer to profile, we may need it for migration from history.
Profile* profile_;
// The model. The model is NULL once BookmarkModelDeleted has been invoked.
BookmarkModel* model_;
// Thread read/writing is run on. This comes from the profile, and is null
// during testing.
const base::Thread* backend_thread_;
// Helper to write bookmark data safely.
ImportantFileWriter writer_;
// Helper to ensure that we unregister from notifications on destruction.
NotificationRegistrar notification_registrar_;
// Path to temporary file created during migrating bookmarks from history.
const FilePath tmp_history_path_;
DISALLOW_COPY_AND_ASSIGN(BookmarkStorage);
};
#endif // CHROME_BROWSER_BOOKMARKS_BOOKMARK_STORAGE_H_
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