examples/python/reactor/handlers.py

#!/usr/bin/python
#
# Licensed to the Apache Software Foundation (ASF) under one
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# distributed with this work for additional information
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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from __future__ import print_function
import time
from proton.reactor import Reactor


class World:

    def on_reactor_init(self, event):
        print("World!")

class Goodbye:

    def on_reactor_final(self, event):
        print("Goodbye, World!")

class Hello:

    def __init__(self):
        # When an event dispatches itself to a handler, it also checks
        # if that handler has a "handlers" attribute and dispatches
        # the event to any children.
        self.handlers = [World(), Goodbye()]

    # The parent handler always receives the event first.
    def on_reactor_init(self, event):
        print("Hello", end=' ')

r = Reactor(Hello())
r.run()