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// Copyright 2017 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 NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_
#define NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_
#include <stdint.h>
#include "base/compiler_specific.h"
#include "base/time/time.h"
#include "net/base/net_export.h"
namespace net {
// Observes changes in the network quality.
class NET_EXPORT_PRIVATE RTTAndThroughputEstimatesObserver {
public:
// Notifies the observer when estimated HTTP RTT, estimated transport RTT or
// estimated downstream throughput is computed. NetworkQualityEstimator
// computes the RTT and throughput estimates at regular intervals.
// Additionally, when there is a change in the connection type of the
// device, then the estimates are immediately computed.
//
// |http_rtt|, |transport_rtt| and |downstream_throughput_kbps| are the
// computed estimates of the HTTP RTT, transport RTT and downstream
// throughput (in kilobits per second), respectively. If an estimate of the
// HTTP or transport RTT is unavailable, it will be set to
// nqe::internal::InvalidRTT(). If the throughput estimate is unavailable,
// it will be set to nqe::internal::INVALID_RTT_THROUGHPUT.
virtual void OnRTTOrThroughputEstimatesComputed(
base::TimeDelta http_rtt,
base::TimeDelta transport_rtt,
int32_t downstream_throughput_kbps) = 0;
RTTAndThroughputEstimatesObserver(const RTTAndThroughputEstimatesObserver&) =
delete;
RTTAndThroughputEstimatesObserver& operator=(
const RTTAndThroughputEstimatesObserver&) = delete;
virtual ~RTTAndThroughputEstimatesObserver() = default;
protected:
RTTAndThroughputEstimatesObserver() = default;
};
} // namespace net
#endif // NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_
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