retx-suppression-exponential.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2022,  Regents of the University of California,
 *                           Arizona Board of Regents,
 *                           Colorado State University,
 *                           University Pierre & Marie Curie, Sorbonne University,
 *                           Washington University in St. Louis,
 *                           Beijing Institute of Technology,
 *                           The University of Memphis.
 *
 * This file is part of NFD (Named Data Networking Forwarding Daemon).
 * See AUTHORS.md for complete list of NFD authors and contributors.
 *
 * NFD is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation,
 * either version 3 of the License, or (at your option) any later version.
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 * PURPOSE.  See the GNU General Public License for more details.
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 * You should have received a copy of the GNU General Public License along with
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#ifndef NFD_DAEMON_FW_RETX_SUPPRESSION_EXPONENTIAL_HPP
#define NFD_DAEMON_FW_RETX_SUPPRESSION_EXPONENTIAL_HPP
 
#include "retx-suppression.hpp"
#include "strategy.hpp"
 
namespace nfd::fw {
 
class RetxSuppressionExponential
{
public:
  using Duration = time::milliseconds;
 
  explicit
  RetxSuppressionExponential(Duration initialInterval = DEFAULT_INITIAL_INTERVAL,
                             Duration maxInterval = DEFAULT_MAX_INTERVAL,
                             float multiplier = DEFAULT_MULTIPLIER);
 
  RetxSuppressionResult
  decidePerPitEntry(pit::Entry& pitEntry);
 
  RetxSuppressionResult
  decidePerUpstream(pit::Entry& pitEntry, Face& outFace);
 
  void
  incrementIntervalForOutRecord(pit::OutRecord& outRecord);
 
  static std::unique_ptr<RetxSuppressionExponential>
  construct(const StrategyParameters& params);
 
private: // non-member operators (hidden friends)
  friend std::ostream&
  operator<<(std::ostream& os, const RetxSuppressionExponential& retxSupp)
  {
    return os << "RetxSuppressionExponential initial-interval=" << retxSupp.m_initialInterval
              << " max-interval=" << retxSupp.m_maxInterval
              << " multiplier=" << retxSupp.m_multiplier;
  }
 
public:
  static constexpr Duration DEFAULT_INITIAL_INTERVAL = 10_ms;
  static constexpr Duration DEFAULT_MAX_INTERVAL = 250_ms;
  static constexpr float DEFAULT_MULTIPLIER = 2.0f;
 
NFD_PUBLIC_WITH_TESTS_ELSE_PRIVATE:
  const Duration m_initialInterval;
  const Duration m_maxInterval;
  const float m_multiplier;
};
 
} // namespace nfd::fw
 
#endif // NFD_DAEMON_FW_RETX_SUPPRESSION_EXPONENTIAL_HPP