dead-nonce-list.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2021,  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.
 *
 * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.  See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef NFD_DAEMON_TABLE_DEAD_NONCE_LIST_HPP
#define NFD_DAEMON_TABLE_DEAD_NONCE_LIST_HPP

#include "core/common.hpp"

#include <boost/multi_index_container.hpp>
#include <boost/multi_index/hashed_index.hpp>
#include <boost/multi_index/sequenced_index.hpp>

namespace nfd {

class DeadNonceList : noncopyable
{
public:
  explicit
  DeadNonceList(time::nanoseconds lifetime = DEFAULT_LIFETIME);

  bool
  has(const Name& name, Interest::Nonce nonce) const;

  void
  add(const Name& name, Interest::Nonce nonce);

  size_t
  size() const;

  time::nanoseconds
  getLifetime() const
  {
    return m_lifetime;
  }

private:
  using Entry = uint64_t;

  static Entry
  makeEntry(const Name& name, Interest::Nonce nonce);

  size_t
  countMarks() const;

  void
  mark();

  void
  adjustCapacity();

  void
  evictEntries();

public:
  static constexpr time::nanoseconds DEFAULT_LIFETIME = 6_s;
  static constexpr time::nanoseconds MIN_LIFETIME = 50_ms;

private:
  const time::nanoseconds m_lifetime;

  struct Queue {};
  struct Hashtable {};
  using Container = boost::multi_index_container<
    Entry,
    boost::multi_index::indexed_by<
      boost::multi_index::sequenced<boost::multi_index::tag<Queue>>,
      boost::multi_index::hashed_non_unique<boost::multi_index::tag<Hashtable>,
                                            boost::multi_index::identity<Entry>>
    >
  >;

  Container m_index;
  Container::index<Queue>::type& m_queue = m_index.get<Queue>();
  Container::index<Hashtable>::type& m_ht = m_index.get<Hashtable>();

NFD_PUBLIC_WITH_TESTS_ELSE_PRIVATE:

  // ---- current capacity and hard limits

  size_t m_capacity;

  static constexpr size_t INITIAL_CAPACITY = 1 << 14;

  static constexpr size_t MIN_CAPACITY = 1 << 10;

  static constexpr size_t MAX_CAPACITY = 1 << 24;

  // ---- actual entry lifetime estimation

  static constexpr Entry MARK = 0;

  static constexpr size_t EXPECTED_MARK_COUNT = 5;

  std::multiset<size_t> m_actualMarkCounts;

  const time::nanoseconds m_markInterval;
  scheduler::ScopedEventId m_markEvent;

  // ---- capacity adjustments

  static constexpr double CAPACITY_UP = 1.2;
  static constexpr double CAPACITY_DOWN = 0.9;
  const time::nanoseconds m_adjustCapacityInterval;
  scheduler::ScopedEventId m_adjustCapacityEvent;

  static constexpr size_t EVICT_LIMIT = 64;
};

} // namespace nfd

#endif // NFD_DAEMON_TABLE_DEAD_NONCE_LIST_HPP