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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef CONNECTION_H
#define CONNECTION_H
#include <QHostAddress>
#include <QString>
#include <QTcpSocket>
#include <QTime>
#include <QTimer>
static const int MaxBufferSize = 1024000;
class Connection : public QTcpSocket
{
Q_OBJECT
public:
enum ConnectionState {
WaitingForGreeting,
ReadingGreeting,
ReadyForUse
};
enum DataType {
PlainText,
Ping,
Pong,
Greeting,
Undefined
};
Connection(QObject *parent = 0);
QString name() const;
void setGreetingMessage(const QString &message);
bool sendMessage(const QString &message);
signals:
void readyForUse();
void newMessage(const QString &from, const QString &message);
protected:
void timerEvent(QTimerEvent *timerEvent);
private slots:
void processReadyRead();
void sendPing();
void sendGreetingMessage();
private:
int readDataIntoBuffer(int maxSize = MaxBufferSize);
int dataLengthForCurrentDataType();
bool readProtocolHeader();
bool hasEnoughData();
void processData();
QString greetingMessage;
QString username;
QTimer pingTimer;
QTime pongTime;
QByteArray buffer;
ConnectionState state;
DataType currentDataType;
int numBytesForCurrentDataType;
int transferTimerId;
bool isGreetingMessageSent;
};
#endif
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