JAVA设计模式(20)行为型-调停者模式

调停者犹如第三方中介一般，将所有的类与类之间的引用都导向调停者类，所有类的请求，一致发向调停者，由调停者再发向目标类，这样原本复杂的网状的类关系，变成了简单的星型类关系，调停者类位于核心，所有其他类位于外围，指向调停者。

//@author： v: jbossjf

/**
 * 调停者接口
 */
public interface Mediator {
    void change(String message,ZhiYuan zhiyuan,String nname);
}

/**
 * 职员接口
 */
public abstract class ZhiYuan {
    String name;
    private Mediator mediator;
    public ZhiYuan(Mediator mediator,String name){
        this.mediator = mediator;
        this.name = name;
    }
    //被调停者调用的方法
    public void called(String message,String nname){
        System.out.println(name + "接收到来自"+ nname + "的需求：" + message);
    }
    //调用调停者
    public void call(String message,ZhiYuan zhiyuan,String nname){
        System.out.println(nname + "发起需求："+ message);
        mediator.change(message,zhiyuan,nname);
    }
}

/**
 * 调停者：经理
 */
public class Jingli implements Mediator {
    @Override
    public void change(String message,ZhiYuan zhiyuan,String nname) {
        System.out.println("经理收到" + nname + "的需求：" + message);
        System.out.println("经理将" + nname + "的需求发送给目标职员");
        zhiyuan.called(message,nname);
    }
}

/**
 * 职员A
 */
public class ZhiyuanA extends ZhiYuan {
    public ZhiyuanA(Mediator mediator, String name) {
        super(mediator, name);
    }
}

/**
 * 职员B
 */
public class ZhiyuanB extends ZhiYuan {
    public ZhiyuanB(Mediator mediator, String name) {
        super(mediator, name);
    }
}

/**
 * 职员C
 */
public class ZhiyuanC extends ZhiYuan {
    public ZhiyuanC(Mediator mediator, String name) {
        super(mediator, name);
    }
}

public class Clienter {
    public static void main(String[] args) {
        //分配职员与经理
        Mediator jingli = new Jingli();
        ZhiYuan zhiyuanA = new ZhiyuanA(jingli,"职员A");
        ZhiYuan zhiyuanB = new ZhiyuanB(jingli,"职员B");
        ZhiYuan zhiyuanC = new ZhiyuanC(jingli,"职员C");
        //职员A的需求
        String messageA = "这些资料需要B职员操作";
        zhiyuanA.call(messageA,zhiyuanB,zhiyuanA.name);
        //职员C的请求
        String messageC = "这些资料需要B职员签名";
        zhiyuanC.call(messageC, zhiyuanB,zhiyuanC.name);
    }
}