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# torrentserver.cpp Example File
network/torrent/torrentserver.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #include "connectionmanager.h"
    #include "peerwireclient.h"
    #include "ratecontroller.h"
    #include "torrentclient.h"
    #include "torrentserver.h"

    Q_GLOBAL_STATIC(TorrentServer, torrentServer)

    TorrentServer *TorrentServer::instance()
    {
        return torrentServer();
    }

    void TorrentServer::addClient(TorrentClient *client)
    {
        clients << client;
    }

    void TorrentServer::removeClient(TorrentClient *client)
    {
        clients.removeAll(client);
    }

    void TorrentServer::incomingConnection(int socketDescriptor)
    {
        PeerWireClient *client = new PeerWireClient(ConnectionManager::instance()->clientId(), this);
        if (clients.isEmpty())
            client->abort();

        if (ConnectionManager::instance()->canAddConnection()) {
            if (client->setSocketDescriptor(socketDescriptor)) {
                connect(client, SIGNAL(infoHashReceived(const QByteArray &)),
                        this, SLOT(processInfoHash(const QByteArray &)));
                connect(client, SIGNAL(error(QAbstractSocket::SocketError)),
                        this, SLOT(removeClient()));
                RateController::instance()->addSocket(client);
                ConnectionManager::instance()->addConnection(client);
                if (clients.size() == 1) {
                    client->disconnect(client, 0, this, 0);
                    clients.first()->setupIncomingConnection(client);
                }
                return;
            }
        }

        delete client;
    }

    void TorrentServer::removeClient()
    {
        PeerWireClient *peer = qobject_cast<PeerWireClient *>(sender());
        peer->deleteLater();
        RateController::instance()->removeSocket(peer);
        ConnectionManager::instance()->removeConnection(peer);
    }

    void TorrentServer::processInfoHash(const QByteArray &infoHash)
    {
        PeerWireClient *peer = qobject_cast<PeerWireClient *>(sender());
        foreach (TorrentClient *client, clients) {
            if (client->state() >= TorrentClient::Searching && client->infoHash() == infoHash) {
                peer->disconnect(peer, 0, this, 0);
                client->setupIncomingConnection(peer);
                return;
            }
        }
        removeClient();
    }