Matlab中介者模式

中介者模式（Mediator Pattern）是用來下降多個對象和類之間的通訊複雜性。這種模式提供了一箇中介類，該類一般處理不一樣類之間的通訊，並支持鬆耦合，使代碼易於維護。想象一個亂糟糟的開發小組的工做狀態，組員之間雖然在一塊兒協同工做，可是意見難以統一，老是相互指揮，致使工做進度滯後。這時候，就須要一個仲裁者。全部的組員將本身的狀況彙報給仲裁者，仲裁者會從團隊的總體考慮，而後下達指令。仲裁者負責統一你們的意見。這樣，團隊的交流過程就變成了組員向仲裁者報告，仲裁者向組員下達指令的形式，而組員之間再也不詢問和溝通，這就是Mediator模式。

本文根據https://blog.csdn.net/niunai112/article/details/79913833所給的實例，用Matlab語言實現中介者模式

Mediator.m （抽象的中介者類）

classdef Mediator < handle 
    properties
        userlist = User.empty();
    end
    methods(Abstract)
        sendToAll(~,~);
        sendToPerson(~,~,~);
        join(~,~);
        leave(~,~);
    end
end

ChatPlatform.m （具體的中介者類，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 (抽象的同事類， 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 (具體的同事類， 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

測試代碼：

chatPlatform = ChatPlatform();
a = NormalUser("A", chatPlatform);
b = NormalUser("B", chatPlatform);
c = NormalUser("C", chatPlatform);
a.join();
b.join();
c.join();
disp("-----------------A羣發送消息------------------");
a.sendToAll("A：你們聽獲得嗎?");
disp("-----------------A給B私發消息------------------");
a.sendToPerson("B", "A：B,我只想和你說");
disp("-----------------B給A私發消息------------------");
b.sendToPerson("A","B:能夠，請說" );
disp("-----------------A離開聊天室------------------");
a.leave();
disp("-----------------B羣發送消息------------------");
b.sendToAll("B:A能聽到嗎");

參考資料

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