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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