Qt 5.9 | Qt WebChannel | Qt WebChannel ChatServer Example | chatserver.cpp Example File

Qt 5.9.3 Reference Documentation

# chatserver.cpp Example File

chatserver-cpp/chatserver.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2016 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
      ** Contact: https://www.qt.io/licensing/
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      ** This file is part of the QtWebChannel module of the Qt Toolkit.
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      #include "chatserver.h"

      #include <QDebug>
      #include <QTime>
      #include <QTimer>

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

          m_keepAliveCheckTimer = new QTimer(this);
          m_keepAliveCheckTimer->setSingleShot(true);
          m_keepAliveCheckTimer->setInterval(2000);
          connect(m_keepAliveCheckTimer, &QTimer::timeout, this, &ChatServer::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;
      }