Example of making controller for server (start/stop)

server_controlls

class Statuses(object):
	ON = 1
	OFF = 2


class Singleton(type):

	_instance = None

	def __call__(cls, *args, **kwargs):
		if cls._instance is None:
			cls._instance = super(Singleton, cls).__call__(*args, **kwargs)
		return cls._instance


class ControlMixin(object):

	status = Statuses.OFF

	def start(self):
		print 'I`am running'
		self.status = Statuses.ON

	def stop(self):
		print 'I`am stopping'
		self.status = Statuses.OFF

	def is_enable(self):
		return self.status == Statuses.ON

	def is_disable(self):
		return self.status == Statuses.OFF


class Server(ControlMixin):

	__metaclass__ = Singleton
	
	def __init__(self, func, *args, **kwargs):
		self.func = func
		self.f_args = args
		self.f_kwargs = kwargs

	def loop_run(self):
		if self.is_disable():
			raise SystemError('Can`t run loop while server is not running')
		print 'run processing...'
		for i, x in enumerate(xrange(100)):
			self.func(self.f_args, self.f_kwargs)
			if self.is_disable():
				break
		print 'stop processing...'


def main():

	def same_func(*args, **kwargs):
		print 'I`m calling!'

	p = Server(same_func)
	p.start()
	p.loop_run()
	p.stop()

if __name__ == '__main__':
	main()