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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_H_ |
| 6 #define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_H_ |
| 7 |
| 8 #include "base/macros.h" |
| 9 |
| 10 #include "base/threading/non_thread_safe.h" |
| 11 #include "device/generic_sensor/platform_sensor.h" |
| 12 |
| 13 namespace device { |
| 14 |
| 15 // Base class that defines factory methods for PlatformSensor creation. |
| 16 // Its implementations must be accessed via GetInstance() method. |
| 17 class PlatformSensorProvider : public base::NonThreadSafe { |
| 18 public: |
| 19 // Note: returns 'nullptr' if there is no available implementation for |
| 20 // the current platform. |
| 21 static PlatformSensorProvider* GetInstance(); |
| 22 |
| 23 // Creates new instance of PlatformSensor. |
| 24 scoped_refptr<PlatformSensor> CreateSensor(mojom::SensorType type, |
| 25 uint64_t size, |
| 26 uint64_t offset); |
| 27 |
| 28 // Gets previously created instance of PlatformSensor by sensor type |type|. |
| 29 scoped_refptr<PlatformSensor> GetSensor(mojom::SensorType type); |
| 30 |
| 31 // Shared buffer getters. |
| 32 mojo::ScopedSharedBufferHandle CloneSharedBufferHandle(); |
| 33 |
| 34 protected: |
| 35 PlatformSensorProvider(); |
| 36 virtual ~PlatformSensorProvider(); |
| 37 |
| 38 // Method that must be implemented by platform specific classes. |
| 39 virtual scoped_refptr<PlatformSensor> CreateSensorInternal( |
| 40 mojom::SensorType type, |
| 41 mojo::ScopedSharedBufferMapping mapping, |
| 42 uint64_t buffer_size) = 0; |
| 43 |
| 44 private: |
| 45 friend class PlatformSensor; // To call RemoveSensor(); |
| 46 |
| 47 bool CreateSharedBufferIfNeeded(); |
| 48 void RemoveSensor(mojom::SensorType type); |
| 49 |
| 50 private: |
| 51 std::map<mojom::SensorType, PlatformSensor*> sensor_map_; |
| 52 mojo::ScopedSharedBufferHandle shared_buffer_handle_; |
| 53 |
| 54 static PlatformSensorProvider* s_instance_; |
| 55 DISALLOW_COPY_AND_ASSIGN(PlatformSensorProvider); |
| 56 }; |
| 57 |
| 58 } // namespace device |
| 59 |
| 60 #endif // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_H_ |
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