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/*
* Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef API_METRONOME_METRONOME_H_
#define API_METRONOME_METRONOME_H_
#include "absl/functional/any_invocable.h"
#include "api/units/time_delta.h"
#include "rtc_base/system/rtc_export.h"
namespace webrtc {
// The Metronome posts OnTick() calls requested with RequestCallOnNextTick.
// The API is designed to be fully used from a single task queue. Scheduled
// callbacks are executed on the same sequence as they were requested on. There
// are no features implemented for cancellation. When that's needed, use e.g.
// ScopedTaskSafety from the client.
//
// The metronome concept is still under experimentation, and may not be availble
// in all platforms or applications. See https://crbug.com/1253787 for more
// details.
//
// Metronome implementations must be thread-compatible.
class RTC_EXPORT Metronome {
public:
virtual ~Metronome() = default;
// Requests a call to `callback` on the next tick. Scheduled callbacks are
// executed on the same sequence as they were requested on. There are no
// features for cancellation. When that's needed, use e.g. ScopedTaskSafety
// from the client.
virtual void RequestCallOnNextTick(absl::AnyInvocable<void() &&> callback) {}
// Returns the current tick period of the metronome.
virtual TimeDelta TickPeriod() const = 0;
};
} // namespace webrtc
#endif // API_METRONOME_METRONOME_H_
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