def handle_subscribed_event(self, event_obj, event_name):
        """Execute the registered handler of an event.

        Retrieve the handler and its arguments, and execute the handler in a
            new thread.

        Args:
            event_obj: Json object of the event.
            event_name: Name of the event to call handler for.
        """
        handler, args = self.handlers[event_name]
        self.executor.submit(handler, event_obj, *args)