Request a job execution.

        The job will be executed after the delay specified in the
        DelayJobRunner contructor elapsed if no other job is requested until
        then.

        :param job: job.
        :type job: callable
        :param args: job's position arguments
        :param kwargs: job's keyworded arguments

def request_job(self, job, *args, **kwargs):
        """
        Request a job execution.

        The job will be executed after the delay specified in the
        DelayJobRunner contructor elapsed if no other job is requested until
        then.

        :param job: job.
        :type job: callable
        :param args: job's position arguments
        :param kwargs: job's keyworded arguments
        """
        self.cancel_requests()
        self._job = job
        self._args = args
        self._kwargs = kwargs
        self._timer.start(self.delay)