JAVA 设计模式 中介者模式

用途

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中介者模式 (Mediator)

用一个中介对象来封装一系列的对象交互。中介者使各对象不需要显示地相互引用，从而使其耦合松散，而且可以独立地改变它们之间的交互。

中介者模式是一种行为型模式。

结构

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" alt="" />

图-中介者模式结构图

Mediator : 为 Colleague 对象定义一个交流接口。

abstract class Mediator {

    public abstract void Send(String message, Colleague colleague);

}

ConcreteMediator : 实现 Mediator 中的交流接口。 这个类中需要了解并维护所有的 colleague 对象。

class ConcreteMediator extends Mediator {

    private ConcreteColleague1 colleague1;

    private ConcreteColleague2 colleague2;

    public void setColleague1(ConcreteColleague1 colleague1) {

        this.colleague1 = colleague1;

    }

    

    public void setColleague2(ConcreteColleague2 colleague2) {

        this.colleague2 = colleague2;

    }

     

    @Override

    public void Send(String message, Colleague colleague) {

        if (colleague == colleague1) {

            colleague2.Notify(message);

        } else if (colleague == colleague2){

            colleague1.Notify(message);

        } else {

            System.out.println("Error!");

        }

    }

}

Colleague组 : 每个 Colleague 对象应该知道它的 Mediator 对象，但不知道其他同事对象。它只能联系 Mediator 对象。

abstract class Colleague {

    protected Mediator mediator;

    

    public Colleague(Mediator mediator) {

        this.mediator = mediator;

    }

    

    public void Send(String message) {

        mediator.Send(message, this);

    }

    

    public abstract void Notify(String message);

}

class ConcreteColleague1 extends Colleague {

    public ConcreteColleague1(Mediator mediator) {

        super(mediator);

    }

    

    @Override

    public void Notify(String message) {

        System.out.println("同事1得到信息：" + message);

    }

}

class ConcreteColleague2 extends Colleague {

    public ConcreteColleague2(Mediator mediator) {

        super(mediator);

    }

    @Override

    public void Notify(String message) {

        System.out.println("同事2得到信息：" + message);

    }

}

测试代码

public class MediatorPattern {

    public static void main(String[] args) {

        ConcreteMediator mediator = new ConcreteMediator();

        ConcreteColleague1 colleague1 = new ConcreteColleague1(mediator);

        ConcreteColleague2 colleague2 = new ConcreteColleague2(mediator);

        

        mediator.setColleague1(colleague1);

        mediator.setColleague2(colleague2);

        

        colleague1.Send("How are you?");

        colleague2.Send("Fine, thank you. And you?");

        colleague1.Send("I'm fine. Thankes.");

    }

}

运行结果

同事2得到信息：How are you?

同事1得到信息：Fine, thank you. And you?

同事2得到信息：I'm fine. Thankes.

应用场景

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中介者模式一般用于定义良好但是交互较为负责的对象集合。产生的相互依赖关系是无结构化的并且难以理解。

和很多其他对象有引用关系以及交互的对象很难被重用。

想定制一个分布在多个类中的行为，而又不想生成太多的子类的场合。

推荐

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本文属于 JAVA设计模式系列 。

参考资料

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《大话设计模式》

《HeadFirst设计模式》