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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_POWER_AUTO_SCREEN_BRIGHTNESS_ALS_READER_H_
#define CHROME_BROWSER_ASH_POWER_AUTO_SCREEN_BRIGHTNESS_ALS_READER_H_
#include <memory>
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
namespace ash {
namespace power {
namespace auto_screen_brightness {
class AlsFileReader;
class AlsReaderTest;
class FakeLightProvider;
class LightProviderInterface;
class LightProviderMojo;
class LightSamplesObserver;
// If IIO Service is present, it uses LightProviderMojo as the implementation of
// LightProviderInterface; otherwise, it uses AlsFileReader.
class AlsReader {
public:
// Status of AlsReader initialization.
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class AlsInitStatus {
kSuccess = 0,
kInProgress = 1,
kDisabled = 2,
kIncorrectConfig = 3,
kMissingPath = 4,
kMaxValue = kMissingPath
};
// Frequency in hertz at which we read ALS samples.
// TODO(jiameng): currently set frequency to 1hz. May revise.
static constexpr double kAlsPollFrequency = 1.0;
// AlsReader must outlive the observers.
class Observer : public base::CheckedObserver {
public:
Observer() = default;
Observer(const Observer&) = delete;
Observer& operator=(const Observer&) = delete;
~Observer() override = default;
virtual void OnAmbientLightUpdated(int lux) = 0;
virtual void OnAlsReaderInitialized(AlsInitStatus status) = 0;
};
AlsReader();
~AlsReader();
void Init();
// Adds or removes an observer.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
private:
friend AlsFileReader;
friend AlsReaderTest;
friend FakeLightProvider;
friend LightProviderMojo;
friend LightSamplesObserver;
void SetLux(int lux);
void SetAlsInitStatus(AlsInitStatus status);
void SetAlsInitStatusForTesting(AlsInitStatus status);
// Background task runner for checking ALS status and reading ALS values.
scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
base::ObserverList<Observer> observers_;
AlsInitStatus status_ = AlsInitStatus::kInProgress;
std::unique_ptr<LightProviderInterface> provider_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<AlsReader> weak_ptr_factory_{this};
};
class LightProviderInterface {
public:
LightProviderInterface(const LightProviderInterface&) = delete;
LightProviderInterface& operator=(const LightProviderInterface&) = delete;
virtual ~LightProviderInterface();
protected:
explicit LightProviderInterface(AlsReader* als_reader);
raw_ptr<AlsReader, DanglingUntriaged> als_reader_;
};
} // namespace auto_screen_brightness
} // namespace power
} // namespace ash
#endif // CHROME_BROWSER_ASH_POWER_AUTO_SCREEN_BRIGHTNESS_ALS_READER_H_
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