34 lines
1.1 KiB
Python
34 lines
1.1 KiB
Python
#!/usr/bin/env python3
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# -*- coding:utf-8 -*-
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#############################################################################
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# Copyright (c) 2023 Huawei Technologies Co.,Ltd.
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#
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# openGauss is licensed under Mulan PSL v2.
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# You can use this software according to the terms
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# and conditions of the Mulan PSL v2.
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# You may obtain a copy of Mulan PSL v2 at:
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#
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# http://license.coscl.org.cn/MulanPSL2
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#
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# THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OF ANY KIND,
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# EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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# MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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# See the Mulan PSL v2 for more details.
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# ----------------------------------------------------------------------------
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# Description : gs_upgradechk is a utility to check meta data in gaussdb after upgrade.
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#############################################################################
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"""
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单例模式
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"""
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def singleton(cls):
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_instance = {}
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def inner():
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if cls not in _instance:
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_instance[cls] = cls()
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return _instance.get(cls)
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return inner
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