python设计模式之监听模式

最新推荐文章于 2025-03-19 18:03:10 发布

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最新推荐文章于 2025-03-19 18:03:10 发布

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本文链接：https://blog.youkuaiyun.com/u011747152/article/details/85620016

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本文介绍了一种使用观察者模式来更新多个依赖于热水器温度变化的对象的设计模式。通过将热水器温度更新通知到饮茶和淋浴两个观察者，演示了如何在温度达到特定条件时触发相应的行为。

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class heatWater(object):
    def __init__(self):
        self.__observers=[]
        self.__waterHeater=25
    def addObserver(self,observer):
        self.__observers.append(observer)

    def getWatterHeater(self):
        return self.__waterHeater
    def heater(self,waterHeater):
        print(waterHeater)
        self.__waterHeater=waterHeater
        self.notify()
    def notify(self):
        for o in self.__observers:
            o.update(self)

class Observer(object):
    def update(self,heatHeater):
        pass

class DrinkWater(Observer):
    def update(self,heatHeater):
        if(heatHeater.getWatterHeater()>=100):
            print("drink")
class Shower(Observer):
    def update(self,heatHeater):
        if(heatHeater.getWatterHeater()<=70 and heatHeater.getWatterHeater()>=50):
            print("take shower")

t=heatWater()
t.addObserver(DrinkWater())
t.addObserver(Shower())
t.heater(70)
t.heater(100)

70
take shower
100
drink

现在是监听模式写死在对象里，我们现在把他分离出来

class Observer(object):
    def update(self,heatHeater):
        pass
class Observable(object):
    def __init__(self):
         self.__observers=[]
    def addObserver(self,observer):
        self.__observers.append(observer)
    def notify(self):
        for o in self.__observers:
            o.update(self)

class heatWater(Observable):
    def __init__(self):
        super().__init__()
        self.__waterHeater=25
    def getWatterHeater(self):
        return self.__waterHeater
    def heater(self,waterHeater):
        print(waterHeater)
        self.__waterHeater=waterHeater
        self.notify()


class DrinkWater(Observer):
    def update(self,heatHeater):
        if(heatHeater.getWatterHeater()>=100):
            print("drink")
class Shower(Observer):
    def update(self,heatHeater):
        if(heatHeater.getWatterHeater()<=70 and heatHeater.getWatterHeater()>=50):
            print("take shower")

t=heatWater()
t.addObserver(DrinkWater())
t.addObserver(Shower())
t.heater(70)
t.heater(100)

在这里插入图片描述