设计模式-行为型-中介者模式

简介

中介者模式时行为型模式的一种，在生活中也比较常见。当我们去租房时，链家就是中介者角色，房东在它那里发布房源信息，房客去链家寻找房源。下面就以房东发布房源和房客寻找房源为例来示例。

Demo示例

1.定义房产中介接口，然后链家实现该接口。

public interface HouseMediator {
     void sendRentInfo(Client client, String info);
}

public class Lianjia implements HouseMediator{

    @Override
    public void sendRentInfo(Client client, String info) {
        System.out.println(client.getRole() + " send info: " + info);
    }
}

2.定义客户，对于链家，房东和房客均为其客户。

import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;

@Setter
@Getter
@AllArgsConstructor
@NoArgsConstructor
public class Client {
    private String role;
    private HouseMediator mediator;

    public void printRoomInfo(String info) {
        this.mediator.sendRentInfo(this, info);
    }
}

3.客户端调用

public class Test {
    public static void main(String[] args) {
        HouseMediator lianjia = new Lianjia();
        Client houseOwner = new Client("House owner", lianjia);
        Client tenant = new Client("Tenant", lianjia);

        houseOwner.printRoomInfo("I want to rent my house.");
        tenant.printRoomInfo("I want to rent a house");
        /**
         * House owner send info: I want to rent my house.
         * Tenant send info: I want to rent a house
         */
    }
}