examples/python/reactor/reactor-logger.py

#!/usr/bin/python
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# 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
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
#

from __future__ import print_function
import time
from proton.reactor import Reactor

class Logger:

    def on_unhandled(self, name, event):
        print("LOG:", name, event)

class Program:

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

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

# You can pass multiple handlers to a reactor when you construct it.
# Each of these handlers will see every event the reactor sees. By
# combining this with on_unhandled, you can log each event that goes
# to the reactor.
r = Reactor(Program(), Logger())
r.run()

# Note that if you wanted to add the logger later, you could also
# write the above as below. All arguments to the reactor are just
# added to the default handler for the reactor.

def logging_enabled():
    return False

r = Reactor(Program())
if logging_enabled():
    r.handler.add(Logger())
r.run()