Time Server Application

The Time Server Application instantiates a MinuteTimer object and shares it with all connected Time Client Applications.

Defining Remote Objects using a REP-file

The REP-file "timemodel.rep" in the parent directory of the example is used to generate the header-files used by both applications. For this application, the generated "rep_timemodel_source.h" file defines MinuteTimerSource, the the class to subclass for the implementation of MinuteTimer, and other related classes.

The TimeModel Class

The TimeModel class in timemodel.h and timemodel.cpp implements the time object to share. It uses a QBasicTimer to ensure that the time is updated by calling the timerEvent member function.

void MinuteTimer::timerEvent(QTimerEvent *)
{
    QTime now = QTime::currentTime();
    if (now.second() == 59 && now.minute() == time.minute() && now.hour() == time.hour()) {
        // just missed time tick over, force it, wait extra 0.5 seconds
        time = time.addSecs(60);
        timer.start(60500, this);
    } else {
        time = now;
        timer.start(60000-time.second()*1000, this);
    }
    qDebug()<<"Time"<<time;
    setHour(time.hour());
    setMinute(time.minute());
    emit timeChanged();
}

Sharing an Instance of TimeModel

Instances of QRemoteObjectHost and a QRemoteObjectRegistryHost are created to host an object and having a registry to find it. A MinuteTimer object is then created and it is shared using the enableRemoting member function of the QRemoteObjectRegistryHost object.

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    #if defined(Q_OS_UNIX) || defined(Q_OS_LINUX) || defined(Q_OS_QNX)
        signal(SIGINT, &unix_handler);
    #elif defined(Q_OS_WIN32)
        SetConsoleCtrlHandler((PHANDLER_ROUTINE)WinHandler, TRUE);
    #endif
    QRemoteObjectHost node(QUrl(QStringLiteral("local:replica")),QUrl(QStringLiteral("local:registry")));
    QRemoteObjectRegistryHost node2(QUrl(QStringLiteral("local:registry")));
    MinuteTimer timer;
    node2.enableRemoting(&timer);

    Q_UNUSED(timer)
    return app.exec();
}

Example project @ code.qt.io