chatserver.cpp Example File | Qt WebChannel 5.4

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- Qt WebChannel Chatserver Example
- chatserver.cpp Example File
- Qt 5.4.2 Reference Documentation

# chatserver.cpp Example File

chatserver-cpp/chatserver.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the QtWebChannel module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
    ** a written agreement between you and Digia. For licensing terms and
    ** conditions see http://qt.digia.com/licensing. For further information
    ** use the contact form at http://qt.digia.com/contact-us.
    **
    ** 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 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
    ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
    ** In addition, as a special exception, Digia gives you certain additional
    ** rights. These rights are described in the Digia Qt LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include "chatserver.h"

    #include <QtCore/QDebug>
    #include <QTimer>
    #include <QTime>

    ChatServer::ChatServer(QObject *parent)
        : QObject(parent)
    {
        QTimer* t = new QTimer(this);
        connect(t, SIGNAL(timeout()), this, SLOT(sendKeepAlive()));
        t->start(10000);

        m_keepAliveCheckTimer = new QTimer(this);
        m_keepAliveCheckTimer->setSingleShot(true);
        m_keepAliveCheckTimer->setInterval(2000);
        connect(m_keepAliveCheckTimer, SIGNAL(timeout()), this, SLOT(checkKeepAliveResponses()));
    }

    ChatServer::~ChatServer()
    {}

    bool ChatServer::login(const QString& userName)
    {
        //stop keepAliveCheck, when a new user logged in
        if (m_keepAliveCheckTimer->isActive()) {
            m_keepAliveCheckTimer->stop();
            m_stillAliveUsers.clear();
        }

        if (m_userList.contains(userName)) {
            return false;
        }

        qDebug() << "User logged in:" << userName;
        m_userList.append(userName);
        m_userList.sort();
        emit userListChanged();
        emit userCountChanged();
        return true;
    }

    bool ChatServer::logout(const QString& userName)
    {
        if (!m_userList.contains(userName)) {
            return false;
        } else {
            m_userList.removeAt(m_userList.indexOf(userName));
            emit userListChanged();
            emit userCountChanged();
            return true;
        }
    }

    bool ChatServer::sendMessage(const QString& user, const QString& msg)
    {
        if (m_userList.contains(user)) {
            emit newMessage(QTime::currentTime().toString("HH:mm:ss"), user, msg);
            return true;
        } else {
            return false;
        }
    }

    void ChatServer::sendKeepAlive() {
        emit keepAlive();
        m_keepAliveCheckTimer->start();
    }

    void ChatServer::checkKeepAliveResponses() {
        qDebug() << "Keep Alive Check" << m_stillAliveUsers;
        m_userList = m_stillAliveUsers;
        m_stillAliveUsers.clear();
        m_userList.sort();
        emit userListChanged();
    }

    void ChatServer::keepAliveResponse(const QString& user) {
        m_stillAliveUsers.append(user);
    }

    QStringList ChatServer::userList() const
    {
        return m_userList;
    }