blob: fb3709a072d24607c0931a43b41b70827b81655e [file] [log] [blame]
# 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
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# 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, random
from proton.reactor import Reactor
# Let's try to modify our counter example. In addition to counting to
# 10 in quarter second intervals, let's also print out a random number
# every half second. This is not a super easy thing to express in a
# purely sequential program, but not so difficult using events.
class Counter:
def __init__(self, limit):
self.limit = limit
self.count = 0
def on_timer_task(self, event):
self.count += 1
if not self.done():
event.reactor.schedule(0.25, self)
# add a public API to check for doneness
def done(self):
return self.count >= self.limit
class Program:
def on_reactor_init(self, event):
self.start = time.time()
print("Hello, World!")
# Save the counter instance in an attribute so we can refer to
# it later.
self.counter = Counter(10)
event.reactor.schedule(0.25, self.counter)
# Now schedule another event with a different handler. Note
# that the timer tasks go to separate handlers, and they don't
# interfere with each other.
event.reactor.schedule(0.5, self)
def on_timer_task(self, event):
# keep on shouting until we are done counting
print("Yay, %s!" % random.randint(10, 100))
if not self.counter.done():
event.reactor.schedule(0.5, self)
def on_reactor_final(self, event):
print("Goodbye, World! (after %s long seconds)" % (time.time() - self.start))
# In we said the reactor exits when there are no more
# events to process. While this is true, it's not actually complete.
# The reactor exits when there are no more events to process and no
# possibility of future events arising. For that reason the reactor
# will keep running until there are no more scheduled events and then
# exit.
r = Reactor(Program())