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49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
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// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_
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#define NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_
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#include <stdint.h>
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#include "base/compiler_specific.h"
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#include "base/macros.h"
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#include "base/time/time.h"
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#include "net/base/net_export.h"
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namespace net {
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// Observes changes in the network quality.
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class NET_EXPORT RTTAndThroughputEstimatesObserver {
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public:
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// Notifies the observer when estimated HTTP RTT, estimated transport RTT or
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// estimated downstream throughput is computed. NetworkQualityEstimator
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// computes the RTT and throughput estimates at regular intervals.
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// Additionally, when there is a change in the connection type of the
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// device, then the estimates are immediately computed.
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//
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// |http_rtt|, |transport_rtt| and |downstream_throughput_kbps| are the
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// computed estimates of the HTTP RTT, transport RTT and downstream
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// throughput (in kilobits per second), respectively. If an estimate of the
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// HTTP or transport RTT is unavailable, it will be set to
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// nqe::internal::InvalidRTT(). If the throughput estimate is unavailable,
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// it will be set to nqe::internal::kInvalidThroughput.
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virtual void OnRTTOrThroughputEstimatesComputed(
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base::TimeDelta http_rtt,
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base::TimeDelta transport_rtt,
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int32_t downstream_throughput_kbps) = 0;
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virtual ~RTTAndThroughputEstimatesObserver() {}
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protected:
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RTTAndThroughputEstimatesObserver() {}
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private:
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DISALLOW_COPY_AND_ASSIGN(RTTAndThroughputEstimatesObserver);
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};
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} // namespace net
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#endif // NET_NQE_RTT_THROUGHPUT_ESTIMATES_OBSERVER_H_
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