cs-policy-lru.hpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#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/hashed_index.hpp>

namespace nfd {
namespace cs {
namespace lru {

struct EntryItComparator
{
  bool
  operator()(const iterator& a, const iterator& b) const
  {
    return *a < *b;
  }
};

typedef boost::multi_index_container<
    iterator,
    boost::multi_index::indexed_by<
      boost::multi_index::sequenced<>,
      boost::multi_index::ordered_unique<
        boost::multi_index::identity<iterator>, EntryItComparator
      >
    >
  > Queue;

class LruPolicy : public Policy
{
public:
  LruPolicy();

public:
  static const std::string POLICY_NAME;

private:
  virtual void
  doAfterInsert(iterator i) override;

  virtual void
  doAfterRefresh(iterator i) override;

  virtual void
  doBeforeErase(iterator i) override;

  virtual void
  doBeforeUse(iterator i) override;

  virtual void
  evictEntries() override;

private:
  void
  insertToQueue(iterator i, bool isNewEntry);

private:
  Queue m_queue;
};

} // namespace lru

using lru::LruPolicy;

} // namespace cs
} // namespace nfd

#endif // NFD_DAEMON_TABLE_CS_POLICY_LRU_HPP