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# ratecontroller.h Example File
network/torrent/ratecontroller.h

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     #ifndef RATECONTROLLER_H
     #define RATECONTROLLER_H

     #include <QObject>
     #include <QSet>
     #include <QTime>

     class PeerWireClient;

     class RateController : public QObject
     {
         Q_OBJECT

     public:
         inline RateController(QObject *parent = 0)
             : QObject(parent), transferScheduled(false) { }
         static RateController *instance();

         void addSocket(PeerWireClient *socket);
         void removeSocket(PeerWireClient *socket);

         inline int uploadLimit() const { return upLimit; }
         inline int downloadLimit() const { return downLimit; }
         inline void setUploadLimit(int bytesPerSecond) { upLimit = bytesPerSecond; }
         void setDownloadLimit(int bytesPerSecond);

     public slots:
         void transfer();
         void scheduleTransfer();

     private:
         QTime stopWatch;
         QSet<PeerWireClient *> sockets;
         int upLimit;
         int downLimit;
         bool transferScheduled;
     };

     #endif