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

        /****************************************************************************
        **
        ** 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.
        **
        ****************************************************************************/

        #ifndef TRACKERCLIENT_H
        #define TRACKERCLIENT_H

        #include <QByteArray>
        #include <QList>
        #include <QObject>
        #include <QHostAddress>
        #include <QHttp>

        #include "metainfo.h"
        #include "torrentclient.h"

        class TorrentClient;

        class TrackerClient : public QObject
        {
            Q_OBJECT

        public:
            TrackerClient(TorrentClient *downloader, QObject *parent = 0);

            void start(const MetaInfo &info);
            void stop();

            inline qint64 uploadCount() const { return uploadedBytes; }
            inline qint64 downloadCount() const { return downloadedBytes; }
            inline void setUploadCount(qint64 bytes) { uploadedBytes = bytes; }
            inline void setDownloadCount(qint64 bytes) { downloadedBytes = bytes; }

        signals:
            void connectionError(QHttp::Error error);

            void failure(const QString &reason);
            void warning(const QString &message);
            void peerListUpdated(const QList<TorrentPeer> &peerList);

            void uploadCountUpdated(qint64 newUploadCount);
            void downloadCountUpdated(qint64 newDownloadCount);

            void stopped();

        protected:
            void timerEvent(QTimerEvent *event);

        private slots:
            void fetchPeerList();
            void httpRequestDone(bool error);

        private:
            TorrentClient *torrentDownloader;

            int requestInterval;
            int requestIntervalTimer;
            QHttp http;
            MetaInfo metaInfo;
            QByteArray trackerId;
            QList<TorrentPeer> peers;
            qint64 uploadedBytes;
            qint64 downloadedBytes;
            qint64 length;

            bool firstTrackerRequest;
            bool lastTrackerRequest;
        };

        #endif