1#!/usr/bin/env python3 2# -*- coding: utf-8 -*- 3 4# 5# Copyright (c) 2023 Huawei Device Co., Ltd. 6# Licensed under the Apache License, Version 2.0 (the "License"); 7# you may not use this file except in compliance with the License. 8# You may obtain a copy of the License at 9# 10# http://www.apache.org/licenses/LICENSE-2.0 11# 12# Unless required by applicable law or agreed to in writing, software 13# distributed under the License is distributed on an "AS IS" BASIS, 14# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15# See the License for the specific language governing permissions and 16# limitations under the License. 17 18class Singleton(type): 19 _instances = {} 20 21 def __call__(cls, *args, **kwargs): 22 if cls not in cls._instances: 23 cls._instances[cls] = super(Singleton, 24 cls).__call__(*args, **kwargs) 25 return cls._instances[cls]