def set_stop_handler(self):
        """
        Initializes functions that are invoked when the user or OS wants to kill this process.
        :return:
        """
        signal.signal(signal.SIGTERM, self.graceful_stop)
        signal.signal(signal.SIGABRT, self.graceful_stop)
        signal.signal(signal.SIGINT, self.graceful_stop)