478502b3df
Now Python2 is not supported, this compatibility library for both versions is not needed anymore. Change-Id: Ic6da328a6219c8a00d38602f6b539a2ff5be1b2e
85 lines
2.6 KiB
Python
85 lines
2.6 KiB
Python
# 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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class WorkerBase(object):
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@property
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def _workers(self):
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try:
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return self.__workers
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except AttributeError:
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self.__workers = []
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return self.__workers
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def get_workers(self):
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"""Returns a collection NeutronWorker instances needed by this service.
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"""
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return list(self._workers)
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def add_worker(self, worker):
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"""Adds NeutronWorker needed for this service
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If a object needs to define workers thread/processes outside of API/RPC
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workers then it will call this method to register worker. Should be
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called on initialization stage before running services
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"""
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self._workers.append(worker)
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def add_workers(self, workers):
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"""Adds NeutronWorker list needed for this service
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The same as add_worker but adds a list of workers
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"""
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self._workers.extend(workers)
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class ServicePluginBase(WorkerBase, metaclass=abc.ABCMeta):
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"""Define base interface for any Advanced Service plugin."""
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supported_extension_aliases = []
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@classmethod
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def __subclasshook__(cls, klass):
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"""Checking plugin class.
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The __subclasshook__ method is a class method
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that will be called every time a class is tested
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using issubclass(klass, ServicePluginBase).
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In that case, it will check that every method
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marked with the abstractmethod decorator is
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provided by the plugin class.
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"""
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if not cls.__abstractmethods__:
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return NotImplemented
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for method in cls.__abstractmethods__:
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if any(method in base.__dict__ for base in klass.__mro__):
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continue
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return NotImplemented
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return True
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@abc.abstractmethod
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def get_plugin_type(self):
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"""Return one of predefined service types.
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"""
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pass
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@abc.abstractmethod
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def get_plugin_description(self):
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"""Return string description of the plugin."""
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pass
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