signals.py

#!/usr/bin/env python
"""circuits Signal Handling

A modified version of the circuits Hello World example to demonstrate
how to customize signal handling and cause a delayed system terminate.
"""
from __future__ import print_function

from circuits import Component, Debugger, Event, Timer


class hello(Event):

    """hello Event"""


class App(Component):

    def hello(self):
        """Hello Event Handler"""

        print("Hello World!")

    def signal(self, event, signo, stack):
        Timer(3, Event.create("terminate")).register(self)
        print("Terminating in 3 seconds...")

    def terminate(self):
        self.stop()

    def started(self, component):
        """Started Event Handler

        This is fired internally when your application starts up
        and can be used to trigger events that only occur once
        during startup.
        """

        self.fire(hello())  # Fire hello Event


(App() + Debugger()).run()