aria2/src/BtLeecherStateChoke.h

/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2006 Tatsuhiro Tsujikawa
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#ifndef D_BT_LEECHER_STATE_CHOKE_H
#define D_BT_LEECHER_STATE_CHOKE_H

#include "common.h"

#include <vector>
#include <memory>

#include "TimerA2.h"
#include "PeerStorage.h"

namespace aria2 {

class Peer;

class BtLeecherStateChoke {
private:
  int round_;

  Timer lastRound_;

  class PeerEntry {
  private:
    std::shared_ptr<Peer> peer_;
    int downloadSpeed_;
    bool regularUnchoker_;

  public:
    PeerEntry(const std::shared_ptr<Peer>& peer);
    PeerEntry(const PeerEntry& c);
    ~PeerEntry();

    PeerEntry& operator=(const PeerEntry& c);

    bool operator<(const PeerEntry& rhs) const;

    void swap(PeerEntry& c);

    const std::shared_ptr<Peer>& getPeer() const;

    int getDownloadSpeed() const;

    bool isRegularUnchoker() const;

    void enableChokingRequired();

    void disableChokingRequired();

    void enableOptUnchoking();

    void disableOptUnchoking();
  };

  void plannedOptimisticUnchoke(std::vector<PeerEntry>& peerEntries);

  void regularUnchoke(std::vector<PeerEntry>& peerEntries);

  class PeerFilter {
  private:
    bool amChoking_;
    bool peerInterested_;

  public:
    PeerFilter(bool amChoking, bool peerInterested)
        : amChoking_(amChoking), peerInterested_(peerInterested)
    {
    }

    bool operator()(const PeerEntry& peerEntry) const;
  };

public:
  BtLeecherStateChoke();

  ~BtLeecherStateChoke();

  void executeChoke(const PeerSet& peerSet);

  const Timer& getLastRound() const;

  friend void swap(PeerEntry& a, PeerEntry& b);
};

void swap(BtLeecherStateChoke::PeerEntry& a, BtLeecherStateChoke::PeerEntry& b);

} // namespace aria2

#endif // D_BT_LEECHER_STATE_CHOKE_H