daemon.cpp

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#include "daemon.h"


#include <iostream>
#include <QtCore/QDateTime>

#include "exceptionhandler.h"

using namespace AlarmNotifications;

Daemon& Daemon::instance()
{
    try
    {
        static Daemon global_instance;
        return global_instance;
    }
    catch ( std::exception& e )
    {
        ExceptionHandler ( e, "while starting the AlarmNotifications daemon.", true );
        exit ( 1 ); // ExceptionHandler will also call exit(), but g++ does not know when compiling this
        // so it will complain about a missing return value
    }
    catch ( ... )
    {
        ExceptionHandler ( "while starting the AlarmNotifications daemon.", true );
        exit ( 1 ); // ExceptionHandler will also call exit(), but g++ does not know when compiling this
        // so it will complain about a missing return value
    }
}

Daemon::Daemon()
    : _run ( true )
{
    hsigint = signal ( SIGINT, &signalReceiver );
    hsighup = signal ( SIGHUP, &signalReceiver );
    hsigquit = signal ( SIGQUIT, &signalReceiver );
    hsigusr1 = signal ( SIGUSR1, &signalReceiver );
    hsigusr2 = signal ( SIGUSR2, &signalReceiver );
    hsigterm = signal ( SIGTERM, &signalReceiver );
    std::cout << QDateTime::currentDateTime().toString ( QString::fromUtf8 ( "dd. MMM yyyy hh:mm:ss" ) ).toStdString() << ": Starting AlarmNotifications daemon..." << std::endl;
}

Daemon::~Daemon()
{
    std::cout << QDateTime::currentDateTime().toString ( QString::fromUtf8 ( "dd. MMM yyyy hh:mm:ss" ) ).toStdString() << ": Stopping AlarmNotifications daemon..." << std::endl;
}

void Daemon::run()
{
    try
    {
        while ( _run )
        {
            sleep ( DaemonSleepTimeout );
            std::cout << QDateTime::currentDateTime().toString ( QString::fromUtf8 ( "dd. MMM yyyy hh:mm:ss" ) ).toStdString() << ": ";
            if ( _asc.getNumberOfAlarms() == 0 )
                std::cout << "No alarms active.";
            else
                std::cout << "Number of active alarms: " << _asc.getNumberOfAlarms();
            std::cout << std::endl;
        }
    }
    catch ( std::exception& e )
    {
        ExceptionHandler ( e, "while running the AlarmNotifications daemon.", true );
    }
    catch ( ... )
    {
        ExceptionHandler ( "while running the AlarmNotifications daemon.", true );
    }
}

void Daemon::signalReceiver ( int signum )
{
    if ( signum != SIGINT && signum != SIGHUP && signum != SIGQUIT && signum != SIGUSR1 && signum != SIGUSR2 && signum != SIGTERM )
        return;
    instance()._run = false;
    signal ( SIGINT, instance().hsigint );
    signal ( SIGHUP, instance().hsighup );
    signal ( SIGQUIT, instance().hsigquit );
    signal ( SIGUSR1, instance().hsigusr1 );
    signal ( SIGUSR2, instance().hsigusr2 );
    signal ( SIGTERM, instance().hsigterm );
}