/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/**
 * Copyright (c) 2014,  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_MEASUREMENTS_HPP
#define NFD_DAEMON_TABLE_MEASUREMENTS_HPP

#include "measurements-entry.hpp"
#include "name-tree.hpp"

namespace nfd {

namespace fib {
class Entry;
}

namespace pit {
class Entry;
}


/** \class Measurement
 *  \brief represents the Measurements table
 */
class Measurements : noncopyable
{
public:
  explicit
  Measurements(NameTree& nametree);

  ~Measurements();

  /// find or insert a Measurements entry for name
  shared_ptr<measurements::Entry>
  get(const Name& name);

  /// find or insert a Measurements entry for fibEntry->getPrefix()
  shared_ptr<measurements::Entry>
  get(const fib::Entry& fibEntry);

  /// find or insert a Measurements entry for pitEntry->getName()
  shared_ptr<measurements::Entry>
  get(const pit::Entry& pitEntry);

  /** find or insert a Measurements entry for child's parent
   *
   *  If child is the root entry, returns null.
   */
  shared_ptr<measurements::Entry>
  getParent(shared_ptr<measurements::Entry> child);

  /// perform a longest prefix match
  shared_ptr<measurements::Entry>
  findLongestPrefixMatch(const Name& name) const;

  /// perform an exact match
  shared_ptr<measurements::Entry>
  findExactMatch(const Name& name) const;

  static time::nanoseconds
  getInitialLifetime();

  /** extend lifetime of an entry
   *
   *  The entry will be kept until at least now()+lifetime.
   */
  void
  extendLifetime(measurements::Entry& entry, const time::nanoseconds& lifetime);

  size_t
  size() const;

private:
  void
  cleanup(shared_ptr<measurements::Entry> entry);

  shared_ptr<measurements::Entry>
  get(shared_ptr<name_tree::Entry> nameTreeEntry);

private:
  NameTree& m_nameTree;
  size_t m_nItems;
  static const time::nanoseconds s_defaultLifetime;
};

inline time::nanoseconds
Measurements::getInitialLifetime()
{
  return time::seconds(4);
}

inline size_t
Measurements::size() const
{
  return m_nItems;
}

} // namespace nfd

#endif // NFD_DAEMON_TABLE_MEASUREMENTS_HPP