// 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 NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_ #define NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_ #include #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_