55 lines
1.8 KiB
Python
55 lines
1.8 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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from oslo_log import log
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import stevedore
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from dragonflow.common import exceptions
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LOG = log.getLogger(__name__)
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class AppDispatcher(object):
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def __init__(self, app_list):
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self.apps_list = app_list
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self.apps = {}
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def load(self, *args, **kwargs):
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mgr = stevedore.NamedExtensionManager(
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'dragonflow.controller.apps',
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self.apps_list,
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invoke_on_load=True,
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invoke_args=args,
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invoke_kwds=kwargs,
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)
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for ext in mgr:
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self.apps[ext.name] = ext.obj
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def dispatch(self, method, *args, **kwargs):
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errors = []
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for app in self.apps.values():
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handler = getattr(app, method, None)
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if handler is not None:
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try:
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handler(*args, **kwargs)
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except Exception as e:
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app_name = app.__class__.__name__
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LOG.exception("Dragonflow application '%(name)s' "
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"failed in %(method)s",
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{'name': app_name, 'method': method})
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errors.append(e)
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if errors:
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raise exceptions.DFMultipleExceptions(errors)
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