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Observer/python/Observer.py
88 строк
2 KB
georgedem
Observer
04 авг 2022, 17:45
04 авг 2022, 17:45
2a7602c
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import abc from typing import List class IObserver(metaclass=abc.ABCMeta): @abc.abstractmethod def update(self, p: int): pass class IObservable(metaclass=abc.ABCMeta): @abc.abstractmethod def add__observer(self, o: IObserver): pass @abc.abstractmethod def remove_observer(self, o: IObserver): pass @abc.abstractmethod def notify(self): pass class Product(IObservable): def __init__(self, price: int): self.__price = price self.__observers: List[IObserver] = [] def change_price(self, price: int): self.__price = price self.notify() def add__observer(self, o: IObserver): self.__observers.append(o) def remove_observer(self, o: IObserver): self.__observers.remove(o) def notify(self): for o in self.__observers: o.update(self.__price) class Wholesale(IObserver): def __init__(self, obj: IObservable): self.__product = obj obj.add__observer(self) def update(self, p: int): if p < 300: print('the wholesaler bought the goods at a price {}'.format(p)) self.__product.remove_observer(self) class Buyer(IObserver): def __init__(self, obj: IObservable): self.__product = obj obj.add__observer(self) def update(self, p: int): if p < 350: print('the buyer purchased the product at the price {}'.format(p)) self.__product.remove_observer(self) if __name__ == '__main__': product = Product(400) wholesale = Wholesale(product) buyer = Buyer(product) product.change_price(320) product.change_price(280)