PongCache.h

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/*

Copyright (C) 2005-2007 by Peter Dimov.

This file is part of Calitko (http://www.calitko.org).

Calitko 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.

Calitko 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 Calitko; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

*/

#ifndef PONGCACHE_H
#define PONGCACHE_H

#include "Gnutella/Namespace.h"
#include "Gnutella/Packets/Ping.h"
#include "Gnutella/Packets/Pong.h"
#include "Gnutella/PacketProcessing/PacketProcessor.h"
#include "Gnutella/PacketProcessing/PacketSession.h"
#include "Gnutella/Handshaking/Namespace.h"

// Open containing namespaces:
namespace Gnutella {
namespace PacketProcessing {

using Gnutella::LocalPeer;
using Gnutella::PacketProcessing::PacketProcessor;
using Gnutella::PacketProcessing::PacketSession;
using Gnutella::Packets::Ping;
using Gnutella::Packets::Pong;
using Gnutella::Handshaking::SlotAllocator;


class PongCache : QObject
{
    Q_OBJECT
    REFERENCE_OBJECT (PongCache)

public:
    typedef PacketProcessor::Sessions Paths;

            PongCache (PacketProcessor *pp, LocalPeer *);
            ~PongCache();

    void    addSession (PacketSession *session);
    void    removeSession (PacketSession *session);

    void    cachePong (const Pong &, PacketSession *);
    void    sendCachedPongs (const Ping &, PacketSession *session);
    Paths   pingRoutePaths (const Ping &);

private slots:
    void refreshCache();

private:

    enum Constants
    {
        MinimalPingInterval     = 1000,
        PongExpirationTime      = 10000,
        MaximalPongHops         = 5,
        PongsPerHops            = 1
    };

    struct SessionData
    {
        Pong            directPong;
        Pong            neighborPong;
        QTime           lastInPingTime;
        QTime           lastOutPingTime;

        SessionData();
    };

    LocalPeer           *localPeer; // \todo mayber remove dependency
    PacketProcessor     *packetProcessor;
    SlotAllocator       *slotAllocator;

    Ping                directPing;
    Pong                directPong;
    Pong                hostPong;
    QTimer              pingTimer;

    typedef QPair <Pong, PacketSession *>           PongInfo;
    typedef QQueue <PongInfo *>                     PongForwardQueue;
    typedef QMap <PacketSession *, SessionData *>   Sessions;

    PongForwardQueue    pongForwardQueue[MaximalPongHops];
    PongForwardQueue    cachedPongForwardQueue[MaximalPongHops];
    Sessions            sessions;
};

// Close containing namespaces:
} // namespace PacketProcessing
} // namespace Gnutella

#endif // PONGCACHE_H

Copyright © 2006 Peter Dimov.
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