| // Copyright 2013 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_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_ |
| #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_ |
| |
| #include <map> |
| #include <set> |
| #include <string> |
| |
| #include "base/callback_forward.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/memory/scoped_vector.h" |
| #include "base/memory/weak_ptr.h" |
| #include "chrome/browser/sync_file_system/drive_backend/tracker_set.h" |
| #include "chrome/browser/sync_file_system/sync_callbacks.h" |
| #include "chrome/browser/sync_file_system/sync_status_code.h" |
| |
| namespace base { |
| class FilePath; |
| class SequencedTaskRunner; |
| class SingleThreadTaskRunner; |
| } |
| |
| namespace leveldb { |
| class DB; |
| class WriteBatch; |
| } |
| |
| namespace google_apis { |
| class ChangeResource; |
| class FileResource; |
| class ResourceEntry; |
| } |
| |
| namespace sync_file_system { |
| namespace drive_backend { |
| |
| class FileMetadata; |
| class FileTracker; |
| class ServiceMetadata; |
| struct DatabaseContents; |
| |
| // MetadataDatabase instance holds and maintains database and its indexes. The |
| // database holds metadata of the server-side files/folders as |
| // DriveFileMetadata instances. |
| // The term "file" includes files, folders and other resources on Drive. |
| // |
| // Files have following state: |
| // - Unknown file |
| // - Is initial state of the files, only file_id and parent_folder_id field |
| // are known. |
| // - Has empty synced_details, must be active and dirty. |
| // - Folder |
| // - Is either one of sync-root folder, app-root folder or a regular folder. |
| // - Sync-root folder holds app-root folders as its direct children, and |
| // holds entire SyncFileSystem files as its descentants. Its file_id is |
| // stored in ServiceMetadata. |
| // - App-root folder holds all files for an application as its descendants. |
| // - File |
| // - Unsupported file |
| // - Represents unsupported files such as hosted documents. Must be |
| // inactive. |
| // |
| // Invariants: |
| // - Any file in the database must either: |
| // - be sync-root, |
| // - have an app-root as its parent folder, or |
| // - have an active folder as its parent. |
| // That is, all files must be reachable from sync-root via app-root folders |
| // and active folders. |
| // |
| // - Any active folder must either: |
| // - have needs_folder_listing flag and dirty flag, or |
| // - have all children at the stored largest change id. |
| // |
| class MetadataDatabase { |
| public: |
| typedef std::map<std::string, FileMetadata*> FileByID; |
| typedef std::map<int64, FileTracker*> TrackerByID; |
| typedef std::map<std::string, TrackerSet> TrackersByFileID; |
| typedef std::map<std::string, TrackerSet> TrackersByTitle; |
| typedef std::map<int64, TrackersByTitle> TrackersByParentAndTitle; |
| typedef std::map<std::string, FileTracker*> TrackerByAppID; |
| |
| typedef base::Callback< |
| void(SyncStatusCode status, scoped_ptr<MetadataDatabase> instance)> |
| CreateCallback; |
| |
| static void Create(base::SequencedTaskRunner* task_runner, |
| const base::FilePath& database_path, |
| const CreateCallback& callback); |
| ~MetadataDatabase(); |
| |
| int64 GetLargestChangeID() const; |
| |
| // Registers existing folder as the app-root for |app_id|. The folder |
| // must be an inactive folder that does not yet associated to any App. |
| // This method associates the folder with |app_id| and activates it. |
| void RegisterApp(const std::string& app_id, |
| const std::string& folder_id, |
| const SyncStatusCallback& callback); |
| |
| // Inactivates the folder associated to the app to disable |app_id|. |
| // Does nothing if |app_id| is already disabled. |
| void DisableApp(const std::string& app_id, |
| const SyncStatusCallback& callback); |
| |
| // Activates the folder associated to |app_id| to enable |app_id|. |
| // Does nothing if |app_id| is already enabled. |
| void EnableApp(const std::string& app_id, |
| const SyncStatusCallback& callback); |
| |
| // Unregisters the folder as the app-root for |app_id|. If |app_id| does not |
| // exist, does nothing. The folder is left as an inactive normal folder. |
| void UnregisterApp(const std::string& app_id, |
| const SyncStatusCallback& callback); |
| |
| // Updates database by |changes|. |
| // Marks dirty for each changed file if the file has the metadata in the |
| // database. Adds new metadata to track the file if the file doesn't have |
| // the metadata and its parent folder has the active metadata. |
| void UpdateByChangeList(ScopedVector<google_apis::ChangeResource> changes, |
| const SyncStatusCallback& callback); |
| |
| private: |
| struct DirtyTrackerComparator { |
| bool operator()(const FileTracker* left, |
| const FileTracker* right) const; |
| }; |
| |
| typedef std::set<FileTracker*, DirtyTrackerComparator> DirtyTrackers; |
| |
| friend class MetadataDatabaseTest; |
| |
| explicit MetadataDatabase(base::SequencedTaskRunner* task_runner); |
| static void CreateOnTaskRunner(base::SingleThreadTaskRunner* callback_runner, |
| base::SequencedTaskRunner* task_runner, |
| const base::FilePath& database_path, |
| const CreateCallback& callback); |
| static SyncStatusCode CreateForTesting( |
| scoped_ptr<leveldb::DB> db, |
| scoped_ptr<MetadataDatabase>* metadata_database_out); |
| SyncStatusCode InitializeOnTaskRunner(const base::FilePath& database_path); |
| void BuildIndexes(DatabaseContents* contents); |
| |
| void WriteToDatabase(scoped_ptr<leveldb::WriteBatch> batch, |
| const SyncStatusCallback& callback); |
| |
| scoped_refptr<base::SequencedTaskRunner> task_runner_; |
| scoped_ptr<leveldb::DB> db_; |
| |
| scoped_ptr<ServiceMetadata> service_metadata_; |
| |
| FileByID file_by_id_; // Owned. |
| TrackerByID tracker_by_id_; // Owned. |
| |
| // Maps FileID to trackers. The active tracker must be unique per FileID. |
| // This must be updated when updating |active| field of a tracker. |
| TrackersByFileID trackers_by_file_id_; // Not owned. |
| |
| // Maps AppID to the app-root tracker. |
| // This must be updated when a tracker is registered/unregistered as an |
| // app-root. |
| TrackerByAppID app_root_by_app_id_; // Not owned. |
| |
| // Maps |tracker_id| to its children grouped by their |title|. |
| // If the title is unknown for a tracker, treats its title as empty. Empty |
| // titled file must not be active. |
| // The active tracker must be unique per its parent_tracker and its title. |
| // This must be updated when updating |title|, |active| or |
| // |parent_tracker_id|. |
| TrackersByParentAndTitle trackers_by_parent_and_title_; |
| |
| // Holds all trackers which marked as dirty. |
| // This must be updated when updating |dirty| field of a tracker. |
| DirtyTrackers dirty_trackers_; // Not owned. |
| |
| base::WeakPtrFactory<MetadataDatabase> weak_ptr_factory_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MetadataDatabase); |
| }; |
| |
| } // namespace drive_backend |
| } // namespace sync_file_system |
| |
| #endif // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_ |