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()