设计模式-中介者模式（Mediator）

/**
*中介者模式在消息队列中的应用
*/
package test.mediator;

public abstract class Message {

    private Messages messages;

    public void sendMessage(String messageFrom,String messageTo){
        messages.send(messageFrom, messageTo);
    }

    public abstract void receiveMessage (Message messageFrom);

    public abstract String getName();

    public Messages getMessages(){
        return messages;
    }

    public void setMessages(Messages messages){
        this.messages=messages;
    }

}

package test.mediator;

public class Message1 extends Message{

    @Override
    public void receiveMessage(Message messageFrom) {
        System.out.println(messageFrom.getName()+"堵塞了"+getName());
    }

    @Override
    public String getName() {
        return "消息队列1";
    }

}

package test.mediator;

public class Message2 extends Message{

    @Override
    public void receiveMessage(Message messageFrom) {
        System.out.println(messageFrom.getName()+"堵塞了"+getName());
    }

    @Override
    public String getName() {
        return "消息队列2";
    }

}

package test.mediator;

/**
 * 消息接口
 * @author lenovo
 *
 */
public interface Messages {
    void send(String messageFrom,String messageTo);
    void add(Message message);
}

package test.mediator;

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

public class MessagesImpl implements Messages {

    @SuppressWarnings("rawtypes")
    private Map map=new HashMap();

    @Override
    public void send(String messageFrom, String messageTo) {
        Message message1=(Message)map.get(messageFrom);
        Message message2=(Message)map.get(messageTo);
        message2.receiveMessage(message1);
    }

    @SuppressWarnings("unchecked")
    @Override
    public void add(Message message) {
        message.setMessages(this);
        map.put(message.getName(), message);
    }

}

package test.mediator;

public class Client {
    public static void main(String[] args) {
        Messages messages=new MessagesImpl();
        Message a=new Message1();
        Message b=new Message2();
        messages.add(a);
        messages.add(b);
        a.sendMessage("消息队列1", "消息队列2");
    }
}