标签：join() media details bsp atp top cep sdn handle
中介者模式（Mediator Pattern）是用来降低多个对象和类之间的通信复杂性。这种模式提供了一个中介类，该类通常处理不同类之间的通信，并支持松耦合，使代码易于维护。想象一个乱糟糟的开发小组的工作状态，组员之间虽然在一起协同工作，但是意见难以统一，总是相互指挥，导致工作进度滞后。这时候，就需要一个仲裁者。所有的组员将自己的情况汇报给仲裁者，仲裁者会从团队的整体考虑，然后下达指令。仲裁者负责统一大家的意见。这样，团队的交流过程就变成了组员向仲裁者报告，仲裁者向组员下达指令的形式，而组员之间不再询问和沟通，这就是Mediator模式。
本文根据https://blog.csdn.net/niunai112/article/details/79913833所给的实例，用Matlab语言实现中介者模式
Mediator.m （抽象的中介者类）
classdef Mediator < handle
properties
userlist = User.empty();
end
methods(Abstract)
sendToAll(~,~);
sendToPerson(~,~,~);
join(~,~);
leave(~,~);
end
end
ChatPlatform.m （具体的中介者类，ConcreteMediator）
classdef ChatPlatform < Mediator
methods
function sendToAll(obj,msg)
for i=1:length(obj.userlist)
obj.userlist(i).accept(msg);
end
end
function sendToPerson(obj,name,msg)
user = obj.userlist([obj.userlist.name] == name);
for i = 1:length(user)
user.accept(msg);
end
end
function join(obj,user)
obj.userlist(end + 1) = user;
end
function leave(obj,user)
obj.userlist = obj.userlist(obj.userlist ~= user);
end
end
end
User.m (抽象的同事类， Colleague)
classdef User < handle & matlab.mixin.Heterogeneous
properties
mediator
name
end
methods
function obj = User(name, mediator)
obj.name = name;
obj.mediator = mediator;
end
function sendToAll(obj,msg)
obj.mediator.sendToAll(msg);
end
function sendToPerson(obj,name,msg)
obj.mediator.sendToPerson(name,msg);
end
function join(obj)
obj.mediator.join(obj);
end
function leave(obj)
obj.mediator.leave(obj);
end
end
methods(Abstract)
accept(~,~);
end
end
NormalUser.m (具体的同事类， ConcreteColleague)
classdef NormalUser < User
methods
function obj = NormalUser(name, mediator)
obj = obj@User(name, mediator);
end
function accept(obj,msg)
disp("[" + datestr(now) + "]" + obj.name + " accepted msg: " + msg);
end
end
end
测试代码：
chatPlatform = ChatPlatform();
a = NormalUser("A", chatPlatform);
b = NormalUser("B", chatPlatform);
c = NormalUser("C", chatPlatform);
a.join();
b.join();
c.join();
disp("-----------------A群发送消息------------------");
a.sendToAll("A：大家听得到吗?");
disp("-----------------A给B私发消息------------------");
a.sendToPerson("B", "A：B,我只想和你说");
disp("-----------------B给A私发消息------------------");
b.sendToPerson("A","B:可以，请说" );
disp("-----------------A离开聊天室------------------");
a.leave();
disp("-----------------B群发送消息------------------");
b.sendToAll("B:A能听到吗");
参考资料
https://www.runoob.com/design-pattern/mediator-pattern.html
https://blog.csdn.net/qq_39384184/article/details/80631275
https://blog.csdn.net/niunai112/article/details/79913833
标签：join() media details bsp atp top cep sdn handle
原文地址：https://www.cnblogs.com/usaddew/p/10960584.html
