| // Copyright 2014 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_DEVICE_SENSORS_DEVICE_INERTIAL_SENSOR_SERVICE_H_ |
| #define CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_INERTIAL_SENSOR_SERVICE_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/callback_forward.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/memory/shared_memory.h" |
| #include "base/memory/singleton.h" |
| #include "base/threading/thread_checker.h" |
| #include "content/browser/device_sensors/inertial_sensor_consts.h" |
| #include "content/common/content_export.h" |
| |
| namespace content { |
| |
| class DataFetcherSharedMemory; |
| |
| // Owns the data fetcher for Device Motion and Orientation and keeps track of |
| // the number of consumers currently using the data. The data fetcher is stopped |
| // when there are no consumers. |
| class CONTENT_EXPORT DeviceInertialSensorService { |
| public: |
| // Returns the DeviceInertialSensorService singleton. |
| static DeviceInertialSensorService* GetInstance(); |
| |
| // Increments the number of users of the provider. The Provider is running |
| // when there's > 0 users, and is paused when the count drops to 0. |
| // Must be called on the I/O thread. |
| void AddConsumer(ConsumerType consumer_type); |
| |
| // Removes a consumer. Should be matched with an AddConsumer call. |
| // Must be called on the I/O thread. |
| void RemoveConsumer(ConsumerType cosumer_type); |
| |
| // Returns the shared memory handle of the device motion data duplicated |
| // into the given process. |
| base::SharedMemoryHandle GetSharedMemoryHandleForProcess( |
| ConsumerType consumer_type, base::ProcessHandle handle); |
| |
| // Stop/join with the background polling thread in |provider_|. |
| void Shutdown(); |
| |
| // Injects a custom data fetcher for testing purposes. This class takes |
| // ownership of the injected object. |
| void SetDataFetcherForTesting(DataFetcherSharedMemory* test_data_fetcher); |
| |
| private: |
| friend struct DefaultSingletonTraits<DeviceInertialSensorService>; |
| |
| DeviceInertialSensorService(); |
| virtual ~DeviceInertialSensorService(); |
| |
| bool ChangeNumberConsumers(ConsumerType consumer_type, |
| int delta); |
| int GetNumberConsumers(ConsumerType consumer_type) const; |
| |
| int num_motion_readers_; |
| int num_orientation_readers_; |
| bool is_shutdown_; |
| scoped_ptr<DataFetcherSharedMemory> data_fetcher_; |
| base::ThreadChecker thread_checker_; |
| |
| DISALLOW_COPY_AND_ASSIGN(DeviceInertialSensorService); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_INERTIAL_SENSOR_SERVICE_H_ |