中介者模式-Mediator Pattern

提供一个中介类，中介类和具体的子系统类进行交互，避免了子系统之间的直接交互比如MVC中的controller层，可以来调用不同的service来完成业务

package com.nike.erick.meditor;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

public class Test {
    public static void main(String[] args) {
        ChatRoom chatRoom = new ChatRoom();

        Worker firstWorker = new Worker(chatRoom,"Erick");
        firstWorker.message = "Hello, I am Erick";
        firstWorker.sendMessage();

        Worker secondWorker = new Worker(chatRoom,"Tommy");
        secondWorker.message = "Hello, I am Tommy";
        secondWorker.sendMessage();
    }
}



class ChatRoom {
    
    private Map serviceMap = new HashMap<>();

    

    public void register(String workerName, Worker service) {
        serviceMap.put(workerName, service);
    }

    public void showMessage(Worker worker, String message) {
        System.out.println(new Date() + ":" + message);
    }
}


class Worker {

    public ChatRoom chatRoom;

    public String workName;

    public String message;

    public Worker(ChatRoom chatRoom, String workName) {
        this.chatRoom = chatRoom;
        this.workName = workName;
    }

    public void sendMessage() {
        chatRoom.register(workName, this);
        chatRoom.showMessage(this, message);
    }
}