'Force-fire the callback
Raises:
AssertionError: When trying to force a task that is not
running.'

def force_repeat(self):

    assert self.running, 'Tried    to    fire    an    ExtendedLoopingCall    that    was    not    running.'
    self.call.cancel()
    self.call = None
    self.starttime = self.clock.seconds()
    self()
