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#!/usr/bin/python3

# -*- coding: utf-8 -*-

# @Date : 2020/8/6

# @Author : Bruce Liu /Lin Luo

# @Mail : 15869300264@163.com

class SingletonPipeline(object):

"""

单例模式流水线基类

"""

def __new__(cls, *args, **kwargs):

# 判断类变量中是否有singleton属性

if not hasattr(cls, '_instance'):

# 如果没有singleton属性，则调用super方法，创建一个实例并赋予singleton属性

cls._instance = super().__new__(cls)

print('return instance by created')

return cls._instance

else:

print('return instance from class attribute')

return cls._instance

class Pipeline(SingletonPipeline):

"""

流水线类，继承了单例的基类

"""

def produce_phone(self):

"""

工厂方法

:return:

"""