services/device/generic_sensor/platform_sensor_provider_linux.h

// 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 SERVICES_DEVICE_GENERIC_SENSOR_PUBLIC_PLATFORM_SENSOR_PROVIDER_LINUX_H_
#define SERVICES_DEVICE_GENERIC_SENSOR_PUBLIC_PLATFORM_SENSOR_PROVIDER_LINUX_H_

#include "services/device/generic_sensor/platform_sensor_provider.h"

#include "base/memory/weak_ptr.h"
#include "base/sequenced_task_runner.h"
#include "services/device/generic_sensor/linux/sensor_device_manager.h"

namespace device {

struct SensorInfoLinux;

class PlatformSensorProviderLinux : public PlatformSensorProvider,
                                    public SensorDeviceManager::Delegate {
 public:
  PlatformSensorProviderLinux();
  ~PlatformSensorProviderLinux() override;

  // Sets another service provided by tests.
  void SetSensorDeviceManagerForTesting(
      std::unique_ptr<SensorDeviceManager> sensor_device_manager);

 protected:
  void CreateSensorInternal(mojom::SensorType type,
                            SensorReadingSharedBuffer* reading_buffer,
                            const CreateSensorCallback& callback) override;

  void FreeResources() override;

 private:
  friend class PlatformSensorAndProviderLinuxTest;

  // This is also needed for testing, as we create one provider per test, and
  // std::unique_ptr needs access to the destructor here.
  friend std::unique_ptr<PlatformSensorProviderLinux>::deleter_type;

  using SensorDeviceMap =
      std::unordered_map<mojom::SensorType, std::unique_ptr<SensorInfoLinux>>;

  void SensorDeviceFound(
      mojom::SensorType type,
      SensorReadingSharedBuffer* reading_buffer,
      const PlatformSensorProviderBase::CreateSensorCallback& callback,
      const SensorInfoLinux* sensor_device);

  // Returns SensorInfoLinux structure of a requested type.
  // If a request cannot be processed immediately, returns nullptr and
  // all the requests stored in |requests_map_| are processed after
  // enumeration is ready.
  SensorInfoLinux* GetSensorDevice(mojom::SensorType type);

  // Returns all found iio devices. Currently not implemented.
  void GetAllSensorDevices();

  // Processed stored requests in |request_map_|.
  void ProcessStoredRequests();

  // Called when sensors are created asynchronously after enumeration is done.
  void CreateSensorAndNotify(mojom::SensorType type,
                             SensorInfoLinux* sensor_device);

  // SensorDeviceManager::Delegate implements:
  void OnSensorNodesEnumerated() override;
  void OnDeviceAdded(mojom::SensorType type,
                     std::unique_ptr<SensorInfoLinux> sensor_device) override;
  void OnDeviceRemoved(mojom::SensorType type,
                       const std::string& device_node) override;

  void CreateFusionSensor(mojom::SensorType type,
                          SensorReadingSharedBuffer* reading_buffer,
                          const CreateSensorCallback& callback);

  // Set to true when enumeration is ready.
  bool sensor_nodes_enumerated_;

  // Set to true when |sensor_device_manager_| has already started enumeration.
  bool sensor_nodes_enumeration_started_;

  // Stores all available sensor devices by type.
  SensorDeviceMap sensor_devices_by_type_;

  // A task runner that can run blocking tasks. SensorDeviceManager's methods
  // run in this task runner, as they need to interact with udev.
  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;

  // This manager is being used to get |SensorInfoLinux|, which represents
  // all the information of a concrete sensor provided by OS.
  std::unique_ptr<SensorDeviceManager, base::OnTaskRunnerDeleter>
      sensor_device_manager_;

  base::WeakPtrFactory<PlatformSensorProviderLinux> weak_ptr_factory_{this};

  DISALLOW_COPY_AND_ASSIGN(PlatformSensorProviderLinux);
};

}  // namespace device

#endif  // SERVICES_DEVICE_GENERIC_SENSOR_PUBLIC_PLATFORM_SENSOR_PROVIDER_LINUX_H_