1 // Copyright 2017 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_ 6 #define NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_ 7 8 #include <stdint.h> 9 10 #include "base/compiler_specific.h" 11 #include "base/time/time.h" 12 #include "net/base/net_export.h" 13 14 namespace net { 15 16 // Observes changes in the network quality. 17 class NET_EXPORT_PRIVATE RTTAndThroughputEstimatesObserver { 18 public: 19 // Notifies the observer when estimated HTTP RTT, estimated transport RTT or 20 // estimated downstream throughput is computed. NetworkQualityEstimator 21 // computes the RTT and throughput estimates at regular intervals. 22 // Additionally, when there is a change in the connection type of the 23 // device, then the estimates are immediately computed. 24 // 25 // |http_rtt|, |transport_rtt| and |downstream_throughput_kbps| are the 26 // computed estimates of the HTTP RTT, transport RTT and downstream 27 // throughput (in kilobits per second), respectively. If an estimate of the 28 // HTTP or transport RTT is unavailable, it will be set to 29 // nqe::internal::InvalidRTT(). If the throughput estimate is unavailable, 30 // it will be set to nqe::internal::INVALID_RTT_THROUGHPUT. 31 virtual void OnRTTOrThroughputEstimatesComputed( 32 base::TimeDelta http_rtt, 33 base::TimeDelta transport_rtt, 34 int32_t downstream_throughput_kbps) = 0; 35 36 RTTAndThroughputEstimatesObserver(const RTTAndThroughputEstimatesObserver&) = 37 delete; 38 RTTAndThroughputEstimatesObserver& operator=( 39 const RTTAndThroughputEstimatesObserver&) = delete; 40 41 virtual ~RTTAndThroughputEstimatesObserver() = default; 42 43 protected: 44 RTTAndThroughputEstimatesObserver() = default; 45 }; 46 47 } // namespace net 48 49 #endif // NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_ 50