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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <chrono>
// Implementation inspired from RFC6298
// (https://tools.ietf.org/search/rfc6298#ref-JK88)
namespace transport {
namespace protocol {
class RtoEstimator {
public:
typedef std::chrono::microseconds Duration;
static Duration getInitialRtt() { return std::chrono::seconds(1); }
RtoEstimator(Duration min_rto = std::chrono::seconds(1));
void addMeasurement(Duration measure);
Duration computeRto() const;
private:
double smoothed_rtt_;
double rtt_variation_;
bool first_measurement_;
double last_rto_;
};
} // end namespace protocol
} // end namespace transport
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