26 lines
893 B
Python
26 lines
893 B
Python
# Copyright 2012 OpenStack, LLC
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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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def singleton(cls):
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"""Simple wrapper for classes that should only have a single instance."""
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instances = {}
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def getinstance():
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if cls not in instances:
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instances[cls] = cls()
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return instances[cls]
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return getinstance
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