| // Copyright 2016 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 DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_LINUX_H_ |
| #define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_LINUX_H_ |
| |
| #include "base/memory/ref_counted.h" |
| #include "device/generic_sensor/generic_sensor_export.h" |
| |
| namespace base { |
| class SingleThreadTaskRunner; |
| } |
| |
| namespace device { |
| |
| class PlatformSensorLinux; |
| class PlatformSensorConfiguration; |
| struct SensorInfoLinux; |
| |
| // A generic reader class that can be implemented with two different strategies: |
| // polling and on trigger. |
| class SensorReader { |
| public: |
| // Creates a new instance of SensorReader. At the moment, only polling |
| // reader is supported. |
| static std::unique_ptr<SensorReader> Create( |
| const SensorInfoLinux* sensor_device, |
| PlatformSensorLinux* sensor, |
| scoped_refptr<base::SingleThreadTaskRunner> polling_thread_task_runner); |
| |
| virtual ~SensorReader(); |
| |
| // Starts fetching data based on strategy this reader has chosen. |
| // Only polling strategy is supported at the moment. Thread safe. |
| virtual bool StartFetchingData( |
| const PlatformSensorConfiguration& configuration) = 0; |
| |
| // Stops fetching data. Thread safe. |
| virtual void StopFetchingData() = 0; |
| |
| protected: |
| SensorReader(PlatformSensorLinux* sensor, |
| scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner); |
| |
| // Notifies |sensor_| about an error. |
| void NotifyReadError(); |
| |
| // Non-owned pointer to a sensor that created this reader. |
| PlatformSensorLinux* sensor_; |
| |
| // A task runner that is used to poll data. |
| scoped_refptr<base::SingleThreadTaskRunner> polling_task_runner_; |
| |
| // A task runner that belongs to a thread this reader is created on. |
| scoped_refptr<base::SingleThreadTaskRunner> task_runner_; |
| |
| // Indicates if reading is active. |
| bool is_reading_active_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SensorReader); |
| }; |
| |
| } // namespace device |
| |
| #endif // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_READER_LINUX_H_ |