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# Copyright (c) 2022, Dell Inc. or its subsidiaries. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
# See the LICENSE file for details.
#
# This file is part of NVMe STorage Appliance Services (nvme-stas).
#
# Authors: Martin Belanger <Martin.Belanger@dell.com>
#
'''Implementation of a singleton pattern'''
class Singleton(type):
'''metaclass implementation of a singleton pattern'''
_instances = {}
def __call__(cls, *args, **kwargs):
if cls not in cls._instances:
# This variable declaration is required to force a
# strong reference on the instance.
instance = super(Singleton, cls).__call__(*args, **kwargs)
cls._instances[cls] = instance
return cls._instances[cls]
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