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命令模式(Command)将命令封装为对象,实现命令发送者和命令接收者的解耦。线程池、MVC框架用到了命令模式,本文根据以下类图,用matlab实现命令模式。
Invoker.m (传递命令对象Invoker:持有命令对象,要求命令对象执行请求)
- classdef Invoker < handle
- properties
- command
- end
- methods
- function setOrder(obj,command)
- obj.command = command;
- end
- function execute(obj)
- obj.command.execute();
- end
- end
- end
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Command.m (抽象命令接口Command:定义命令的接口,声明执行的方法)
- classdef Command < handle
- methods(Abstract)
- execute(obj);
- end
- end
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ConcreteCommand.m (具体的命令对象ConcreteCommand:持有具体的接受者对象,完成具体的具体的命令)
- classdef ConcreteCommand < Command
- properties
- receiver
- end
- methods
- function obj = ConcreteCommand(receiver)
- obj.receiver = receiver;
- end
- function execute(obj)
- obj.receiver.execute();
- end
- end
- end
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Receiver.m (接受者对象Receiver:接受者对象,真正执行命令的对象)
- classdef Receiver < handle
- methods
- function execute(~)
- disp("Receiver execute");
- end
- end
- end
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test.m
- r = Receiver();
- c = ConcreteCommand(r);
- i = Invoker();
- i.setOrder(c);
- i.execute();
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