c49594a62f
The context manager in the executor fit only for the blocking executor. Even the dispatcher needs to run code before and after the application callback, eventlet and future executors have to run the pre/post code into the main thread and can run the callback into an other thread, and that force them to run __enter__ and __exit__ manually and deal the exception path. This change adds a helper object instead of the context manager. It is designed to be explicit on what must be executed before and after the callback and what can be done in a thread or not. All the executor code is now in the impl_pooledexecutor.py and use the futures "PoolExecutor" API. This use futurist to provide a eventlet and aioeventlet futures friendly object. Change-Id: I8cd7640f36beeda47560e3c82671bad3530e38d1
52 lines
1.5 KiB
Python
52 lines
1.5 KiB
Python
# 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.
|
|
|
|
import futurist
|
|
|
|
from oslo_messaging._executors import impl_pooledexecutor
|
|
|
|
|
|
class FakeBlockingThread(object):
|
|
def __init__(self, target):
|
|
self._target = target
|
|
|
|
def start(self):
|
|
self._target()
|
|
|
|
@staticmethod
|
|
def join():
|
|
pass
|
|
|
|
@staticmethod
|
|
def stop():
|
|
pass
|
|
|
|
|
|
class BlockingExecutor(impl_pooledexecutor.PooledExecutor):
|
|
|
|
"""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.
|
|
"""
|
|
|
|
_executor_cls = lambda __, ___: futurist.SynchronousExecutor()
|
|
_thread_cls = FakeBlockingThread
|