cs-policy-lru.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2014-2023,  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_CS_POLICY_LRU_HPP
#define NFD_DAEMON_TABLE_CS_POLICY_LRU_HPP
 
#include "cs-policy.hpp"
 
#include <boost/multi_index_container.hpp>
#include <boost/multi_index/sequenced_index.hpp>
#include <boost/multi_index/ordered_index.hpp>
 
namespace nfd::cs {
namespace lru {
 
using Queue = boost::multi_index_container<
                Policy::EntryRef,
                boost::multi_index::indexed_by<
                  boost::multi_index::sequenced<>,
                  boost::multi_index::ordered_unique<boost::multi_index::identity<Policy::EntryRef>>
                >
              >;
 
class LruPolicy final : public Policy
{
public:
  LruPolicy();
 
private:
  void
  doAfterInsert(EntryRef i) final;
 
  void
  doAfterRefresh(EntryRef i) final;
 
  void
  doBeforeErase(EntryRef i) final;
 
  void
  doBeforeUse(EntryRef i) final;
 
  void
  evictEntries() final;
 
  void
  insertToQueue(EntryRef i, bool isNewEntry);
 
public:
  static constexpr std::string_view POLICY_NAME{"lru"};
 
private:
  Queue m_queue;
};
 
} // namespace lru
 
using lru::LruPolicy;
 
} // namespace nfd::cs
 
#endif // NFD_DAEMON_TABLE_CS_POLICY_LRU_HPP