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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_AUDIO_POWER_OBSERVER_HELPER_H_
#define MEDIA_AUDIO_POWER_OBSERVER_HELPER_H_
#include "base/functional/callback_forward.h"
#include "base/gtest_prod_util.h"
#include "base/memory/weak_ptr.h"
#include "base/power_monitor/power_observer.h"
#include "base/task/sequenced_task_runner.h"
#include "media/base/media_export.h"
namespace media {
// Helper class that implements PowerSuspendObserver and handles threading. A
// task runner is given, on which suspend and resume notification callbacks are
// run. It also provides a function to check if we are suspending on the task
// runner.
class MEDIA_EXPORT PowerObserverHelper : public base::PowerSuspendObserver {
public:
PowerObserverHelper(scoped_refptr<base::SequencedTaskRunner> task_runner,
base::RepeatingClosure suspend_callback,
base::RepeatingClosure resume_callback);
PowerObserverHelper(const PowerObserverHelper&) = delete;
PowerObserverHelper& operator=(const PowerObserverHelper&) = delete;
~PowerObserverHelper() override;
// Must be called on |task_runner|.
virtual bool IsSuspending() const;
protected:
base::SequencedTaskRunner* TaskRunnerForTesting() const {
return task_runner_.get();
}
base::RepeatingClosure* SuspendCallbackForTesting() {
return &suspend_callback_;
}
base::RepeatingClosure* ResumeCallbackForTesting() {
return &resume_callback_;
}
private:
FRIEND_TEST_ALL_PREFIXES(PowerObserverHelperTest,
SuspendAndResumeNotificationsTwice);
FRIEND_TEST_ALL_PREFIXES(PowerObserverHelperTest,
TwoSuspendAndTwoResumeNotifications);
// The task runner on which |is_suspending_| should live and the callbacks
// should be run on.
scoped_refptr<base::SequencedTaskRunner> task_runner_;
// Suspend and resume callbacks. Run on |task_runner_|.
base::RepeatingClosure suspend_callback_;
base::RepeatingClosure resume_callback_;
// base::PowerSuspendObserver implementation.
void OnSuspend() override;
void OnResume() override;
// Flag if we are suspending.
bool is_suspending_ = false;
base::WeakPtrFactory<PowerObserverHelper> weak_factory_{this};
};
} // namespace media
#endif // MEDIA_AUDIO_POWER_OBSERVER_HELPER_H_
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