Python中介者模式

中介者模式,中介者提供多人联系沟通的平台。

class Mediator(object):
    def __init__(self):
        self.online_dct = {}

    def register(self, obj):
        self.online_dct[str(obj)] = obj

    def send(self, from_name, to_name, msg):
        if from_name in self.online_dct and to_name in self.online_dct:
            self.online_dct[to_name].recv(from_name, msg)


class Obj(object):
    def __init__(self, name):
        self.name = name

    def __str__(self):
        return self.name

    def recv(self, from_name, msg):
        print(from_name, "-->", self.name, ":", msg)


def main():
    mediator = Mediator()
    obj_a = Obj('a')
    obj_b = Obj('b')
    mediator.register(obj_a)
    mediator.register(obj_b)
    mediator.send(str(obj_a), str(obj_b), "hello")


if __name__ == '__main__':
    main()
Python中的中介者模式是一种行为型设计模式,它允许对象之间通过一个中介者对象进行通信,而不是直接相互引用。这种模式可以减少对象之间的耦合度,使得系统更加灵活和易于维护。 在Python中,可以通过定义一个中介者类来实现中介者模式。该类通常包含一个或多个方法,用于处理对象之间的通信。当一个对象需要与另一个对象通信时,它将消息发送给中介者对象,中介者对象再将消息转发给目标对象。 下面是一个简单的示例代码: ```python class Mediator: def __init__(self): self.colleague1 = Colleague1(self) self.colleague2 = Colleague2(self) def send_message(self, message, colleague): if colleague == self.colleague1: self.colleague2.receive_message(message) else: self.colleague1.receive_message(message) class Colleague1: def __init__(self, mediator): self.mediator = mediator def send_message(self, message): self.mediator.send_message(message, self) def receive_message(self, message): print("Colleague1 received message:", message) class Colleague2: def __init__(self, mediator): self.mediator = mediator def send_message(self, message): self.mediator.send_message(message, self) def receive_message(self, message): print("Colleague2 received message:", message) mediator = Mediator() mediator.colleague1.send_message("Hello from Colleague1") mediator.colleague2.send_message("Hello from Colleague2") ``` 在上面的示例中,Mediator类充当中介者,Colleague1和Colleague2类充当对象。当Colleague1需要与Colleague2通信时,它将消息发送给Mediator对象,Mediator对象再将消息转发给Colleague2对象。
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