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

        /****************************************************************************
        **
        ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation 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
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
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        **
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        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        #include "connectionmanager.h"

        #include <QByteArray>
        #include <QDateTime>

        static const int MaxConnections = 250;

        Q_GLOBAL_STATIC(ConnectionManager, connectionManager)

        ConnectionManager *ConnectionManager::instance()
        {
            return connectionManager();
        }

        bool ConnectionManager::canAddConnection() const
        {
            return (connections.size() < MaxConnections);
        }

        void ConnectionManager::addConnection(PeerWireClient *client)
        {
            connections << client;
        }

        void ConnectionManager::removeConnection(PeerWireClient *client)
        {
            connections.remove(client);
        }

        int ConnectionManager::maxConnections() const
        {
            return MaxConnections;
        }

        QByteArray ConnectionManager::clientId() const
        {
            if (id.isEmpty()) {
                // Generate peer id
                int startupTime = int(QDateTime::currentDateTime().toTime_t());

                QString s;
                s.sprintf("-QT%06x", QT_VERSION);
                id += s.toLatin1();
                id += QByteArray::number(startupTime, 16);
                id += QByteArray(20 - id.size(), '-');
            }
            return id;
        }