15aa5cbda8
It's up to the driver to set a suitable timeout for polling the broker, this one can be different that the one requested by the driver caller as long as the caller timeout is respected. This change also adds a new driver listener API, to be able to stop it cleanly, specially in case of timeout=None. Closes bug: #1400268 Closes bug: #1399257 Change-Id: I674c0def1efb420c293897d49683593a0b10e291
58 lines
1.9 KiB
Python
58 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()
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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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self.listener.stop()
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def wait(self):
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pass
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