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59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
// Copyright 2015 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_EXTERNAL_ESTIMATE_PROVIDER_H_
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#define NET_NQE_EXTERNAL_ESTIMATE_PROVIDER_H_
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#include <stdint.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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// Base class used by external providers such as operating system APIs to
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// provide network quality estimates to NetworkQualityEstimator.
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class NET_EXPORT ExternalEstimateProvider {
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public:
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class NET_EXPORT UpdatedEstimateDelegate {
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public:
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// Will be called with updated RTT, and downstream throughput (in kilobits
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// per second) when an updated estimate is available. If the estimate is
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// unavailable, it is set to a negative value.
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virtual void OnUpdatedEstimateAvailable(
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const base::TimeDelta& rtt,
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int32_t downstream_throughput_kbps) = 0;
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protected:
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UpdatedEstimateDelegate() {}
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virtual ~UpdatedEstimateDelegate() {}
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private:
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DISALLOW_COPY_AND_ASSIGN(UpdatedEstimateDelegate);
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};
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ExternalEstimateProvider() {}
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virtual ~ExternalEstimateProvider() {}
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// Requests the provider to clear its cached network quality estimate.
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virtual void ClearCachedEstimate() = 0;
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// Sets delegate that is notified when an updated estimate is available.
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// |delegate| should outlive |ExternalEstimateProvider|.
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virtual void SetUpdatedEstimateDelegate(
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UpdatedEstimateDelegate* delegate) = 0;
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// Requests an updated network quality estimate from the external estimate
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// provider.
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virtual void Update() const = 0;
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private:
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DISALLOW_COPY_AND_ASSIGN(ExternalEstimateProvider);
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};
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} // namespace net
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#endif // NET_NQE_EXTERNAL_ESTIMATE_PROVIDER_H_
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