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<pre> /****************************************************************************
 **
 ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
 ** License version 2.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
 ** this file.  Please review the following information to ensure GNU
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 #ifndef RATECONTROLLER_H
 #define RATECONTROLLER_H

 #include &lt;QObject&gt;
 #include &lt;QSet&gt;
 #include &lt;QTime&gt;

 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&lt;PeerWireClient *&gt; sockets;
     int upLimit;
     int downLimit;
     bool transferScheduled;
 };

 #endif</pre>
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