41 lines
1.5 KiB
Python
41 lines
1.5 KiB
Python
# Copyright 2014 OpenStack Foundation
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# All Rights Reserved.
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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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class L3EventObservers(object):
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"""Manages observers for L3 agent events."""
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def __init__(self):
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self.observers = set()
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def add(self, new_observer):
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"""Add a listener for L3 agent notifications."""
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for observer in self.observers:
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if isinstance(new_observer, type(observer)):
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raise ValueError('Only a single instance of AdvancedService '
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'may be registered, per type of service.')
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self.observers.add(new_observer)
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def notify(self, l3_event_action, *args, **kwargs):
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"""Give interested parties a chance to act on event.
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NOTE: Preserves existing behavior for error propagation.
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"""
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method_name = l3_event_action.__name__
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for observer in self.observers:
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getattr(observer, method_name)(*args, **kwargs)
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