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

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     #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 (client->setSocketDescriptor(socketDescriptor)) {
             if (ConnectionManager::instance()->canAddConnection()) {
                 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();
     }