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60 lines
1.6 KiB
60 lines
1.6 KiB
#
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# Copyright 2021 Splunk Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""
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Copyright (C) 2005-2019 Splunk Inc. All Rights Reserved.
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Commonly used design partten for python user, includes:
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- singleton (Decorator function used to build singleton)
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"""
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import warnings
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from functools import wraps
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def singleton(class_):
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"""
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Singleton decoorator function.
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"""
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warnings.warn(
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"This function is deprecated. "
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"Please see https://github.com/splunk/addonfactory-ta-library-python/issues/38",
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DeprecationWarning,
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stacklevel=2,
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)
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instances = {}
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@wraps(class_)
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def getinstance(*args, **kwargs):
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if class_ not in instances:
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instances[class_] = class_(*args, **kwargs)
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return instances[class_]
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return getinstance
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class Singleton(type):
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"""
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Singleton meta class
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"""
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_instances = {}
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def __call__(cls, *args, **kwargs):
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if cls not in cls._instances:
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cls._instances[cls] = super().__call__(*args, **kwargs)
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print(cls)
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return cls._instances[cls]
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