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# Copyright 2013 Red Hat, Inc.
# Copyright 2013 New Dream Network, LLC (DreamHost)
#
# Licensed 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 oslo.messaging._executors import base
class BlockingExecutor(base.ExecutorBase):
"""A message executor which blocks the current thread.
The blocking executor's start() method functions as a request processing
loop - i.e. it blocks, processes messages and only returns when stop() is
called from a dispatched method.
Method calls are dispatched in the current thread, so only a single method
call can be executing at once. This executor is likely to only be useful
for simple demo programs.
"""
def __init__(self, conf, listener, dispatcher):
super(BlockingExecutor, self).__init__(conf, listener, dispatcher)
self._running = False
def start(self):
self._running = True
while self._running:
with self.dispatcher(self.listener.poll()) as callback:
callback()
def stop(self):
self._running = False
def wait(self):
pass
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