| // 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/macros.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; |
| |
| virtual ~RTTAndThroughputEstimatesObserver() {} |
| |
| protected: |
| RTTAndThroughputEstimatesObserver() {} |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(RTTAndThroughputEstimatesObserver); |
| }; |
| |
| } // namespace net |
| |
| #endif // NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_ |