57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
# Copyright 2013 Red Hat, Inc.
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# Copyright 2013 New Dream Network, LLC (DreamHost)
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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from oslo.messaging._executors import base
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from oslo.messaging._i18n import _
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LOG = logging.getLogger(__name__)
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class BlockingExecutor(base.ExecutorBase):
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"""A message executor which blocks the current thread.
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The blocking executor's start() method functions as a request processing
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loop - i.e. it blocks, processes messages and only returns when stop() is
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called from a dispatched method.
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Method calls are dispatched in the current thread, so only a single method
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call can be executing at once. This executor is likely to only be useful
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for simple demo programs.
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"""
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def __init__(self, conf, listener, dispatcher):
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super(BlockingExecutor, self).__init__(conf, listener, dispatcher)
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self._running = False
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def start(self):
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self._running = True
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while self._running:
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try:
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incoming = self.listener.poll(timeout=base.POLL_TIMEOUT)
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if incoming is not None:
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with self.dispatcher(incoming) as callback:
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callback()
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except Exception:
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LOG.exception(_("Unexpected exception occurred."))
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def stop(self):
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self._running = False
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def wait(self):
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pass
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