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divious1
43 lines
1.2 KiB
Python
Executable File
43 lines
1.2 KiB
Python
Executable File
# Copyright 2016 Splunk, Inc.
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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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'''
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This module provides some common used patterns.
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'''
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__all__ = ['Singleton']
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class Singleton(type):
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'''
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Singleton meta class
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Usage:
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>>> class Test(object):
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>>> __metaclass__ = Singleton
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>>>
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>>> def __init__(self):
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>>> pass
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'''
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def __init__(cls, name, bases, attrs):
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super(Singleton, cls).__init__(name, bases, attrs)
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cls._instance = None
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def __call__(cls, *args, **kwargs):
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if cls._instance is None:
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cls._instance = super(Singleton, cls).__call__(*args, **kwargs)
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return cls._instance
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