Expose bits of the Web Notification database in the //content API.

content/browser/notifications/platform_notification_context.h

-// Copyright 2015 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 CONTENT_BROWSER_NOTIFICATIONS_PLATFORM_NOTIFICATION_CONTEXT_H_
-#define CONTENT_BROWSER_NOTIFICATIONS_PLATFORM_NOTIFICATION_CONTEXT_H_
-
-#include <stdint.h>
-
-#include "base/callback.h"
-#include "base/files/file_path.h"
-#include "base/memory/ref_counted.h"
-#include "content/common/content_export.h"
-
-class GURL;
-
-namespace base {
-class SequencedTaskRunner;
-}
-
-namespace content {
-
-class NotificationDatabase;
-struct NotificationDatabaseData;
-
-// Implementation of the Web Notification storage context.
-//
-// Represents the storage context for persistent Web Notifications, specific to
-// the storage partition owning the instance. The public methods defined in this
-// interface must only be called on the IO thread.
-class CONTENT_EXPORT PlatformNotificationContext
-    : public base::RefCountedThreadSafe<PlatformNotificationContext> {
- public:
-  // Constructs a new platform notification context. If |path| is non-empty, the
-  // database will be initialized in the "Platform Notifications" subdirectory
-  // of |path|. Otherwise, the database will be initialized in memory.
-  explicit PlatformNotificationContext(const base::FilePath& path);
-
-  using ReadResultCallback =
-      base::Callback<void(bool /* success */,
-                          const NotificationDatabaseData&)>;
-
-  using WriteResultCallback =
-      base::Callback<void(bool /* success */,
-                          int64_t /* notification_id */)>;
-
-  using DeleteResultCallback = base::Callback<void(bool /* success */)>;
-
-  // Reads the data associated with |notification_id| belonging to |origin|
-  // from the database. |callback| will be invoked with the success status
-  // and a reference to the notification database data when completed.
-  void ReadNotificationData(int64_t notification_id,
-                            const GURL& origin,
-                            const ReadResultCallback& callback);
-
-  // Writes the data associated with a notification to a database. When this
-  // action completed, |callback| will be invoked with the success status and
-  // the persistent notification id when written successfully.
-  void WriteNotificationData(const GURL& origin,
-                             const NotificationDatabaseData& database_data,
-                             const WriteResultCallback& callback);
-
-  // Deletes all data associated with |notification_id| belonging to |origin|
-  // from the database. |callback| will be invoked with the success status
-  // when the operation has completed.
-  void DeleteNotificationData(int64_t notification_id,
-                              const GURL& origin,
-                              const DeleteResultCallback& callback);
-
- private:
-  friend class base::RefCountedThreadSafe<PlatformNotificationContext>;
-  friend class PlatformNotificationContextTest;
-
-  virtual ~PlatformNotificationContext();
-
-  // Initializes the database if neccesary. Must be called on the IO thread.
-  // |success_closure| will be invoked on a the |task_runner_| thread when
-  // everything is available, or |failure_closure_| will be invoked on the
-  // IO thread when initialization fails.
-  void LazyInitialize(const base::Closure& success_closure,
-                      const base::Closure& failure_closure);
-
-  // Opens the database. Must be called on the |task_runner_| thread. When the
-  // database has been opened, |success_closure| will be invoked on the task
-  // thread, otherwise |failure_closure_| will be invoked on the IO thread.
-  void OpenDatabase(const base::Closure& success_closure,
-                    const base::Closure& failure_closure);
-
-  // Actually reads the notification data from the database. Must only be
-  // called on the |task_runner_| thread. Will post a task to the IO thread
-  // for invoking |callback| on when the operation has completed.
-  void DoReadNotificationData(int64_t notification_id,
-                              const GURL& origin,
-                              const ReadResultCallback& callback);
-
-  // Actually writes the notification database to the database. Must only be
-  // called on the |task_runner_| thread. Will post a task to the IO thread
-  // for invoking |callback| on when the operation has completed.
-  void DoWriteNotificationData(const GURL& origin,
-                               const NotificationDatabaseData& database_data,
-                               const WriteResultCallback& callback);
-
-  // Actually deletes the notification information from the database. Must only
-  // be called on the |task_runner_| thread. Will post a task to the IO thread
-  // for invoking |callback| on when the operation has completed.
-  void DoDeleteNotificationData(int64_t notification_id,
-                                const GURL& origin,
-                                const DeleteResultCallback& callback);
-
-  // Returns the path in which the database should be initialized. May be empty.
-  base::FilePath GetDatabasePath() const;
-
-  // Sets the task runner to use for testing purposes.
-  void SetTaskRunnerForTesting(
-      const scoped_refptr<base::SequencedTaskRunner>& task_runner);
-
-  base::FilePath path_;
-
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
-  scoped_ptr<NotificationDatabase> database_;
-
-  DISALLOW_COPY_AND_ASSIGN(PlatformNotificationContext);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_NOTIFICATIONS_PLATFORM_NOTIFICATION_CONTEXT_H_