5f760096d6
__metaclass__ cannot be used in python3.six be used in general for python 3 compatibility. Porting Change-Id I9fc7a59df3af29b4cc1287c40fa4e883d994a961 from oslo-incubator Change-Id: Icdacdcf5556b6d3b8450d1350c6f62b4f5a9690b
59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
# 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 abc
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import logging
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import sys
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import six
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from oslo import messaging
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_LOG = logging.getLogger(__name__)
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@six.add_metaclass(abc.ABCMeta)
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class ExecutorBase(object):
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def __init__(self, conf, listener, callback):
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self.conf = conf
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self.listener = listener
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self.callback = callback
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def _dispatch(self, incoming):
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try:
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incoming.reply(self.callback(incoming.ctxt, incoming.message))
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except messaging.ExpectedException as e:
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_LOG.debug('Expected exception during message handling (%s)' %
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e.exc_info[1])
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incoming.reply(failure=e.exc_info, log_failure=False)
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except Exception:
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# sys.exc_info() is deleted by LOG.exception().
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exc_info = sys.exc_info()
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_LOG.error('Exception during message handling',
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exc_info=exc_info)
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incoming.reply(failure=exc_info)
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@abc.abstractmethod
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def start(self):
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"Start polling for incoming messages."
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@abc.abstractmethod
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def stop(self):
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"Stop polling for messages."
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@abc.abstractmethod
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def wait(self):
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"Wait until the executor has stopped polling."
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