dubbo复习: （5）和springboot集成时的标签路由

标签路由：服务提供者和服务消费者都可以指定标签。
只有服务提供者的标签和服务消费者的标签一致时，才会进行请求路由。

给服务提供者指定标签有两种方式，一种是通过在@DubboService注解的tag属性来指定，如下示例

package cn.edu.tju.service;

import org.apache.dubbo.config.annotation.DubboService;

import java.util.Date;


@DubboService(loadbalance = "",tag = "good")
public class DemoServiceImpl implements DemoService {

    public String sayHello(String name) {


        return "Hello " + name;
    }
}

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另一种是通过dubbo admin进行动态指定，后者的优先级更高。
如下示例：

force: false
enabled: true
runtime: false
tags:
 - name: good
   addresses: [192.168.31.226:28093]
 - name: bad
   addresses: [192.168.31.226:28095]


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如果consumer指定了标签为good，示例代码如下：

package cn.edu.tju.service;

import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.PostConstruct;
import java.util.Date;

@Service
public class RemoteService {

    //@DubboReference(loadbalance = "roundrobin")
    @DubboReference(tag = "good")
    private DemoService demoService;
    
    public String  callRemoteService(){
        try {
            Thread. sleep(10);
            return new Date() + " Receive result ======> " + demoService.sayHello("world");
        } catch (InterruptedException e) {
            e.printStackTrace();
            return e.getMessage();
        }
    }
}

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,则会将请求路由到192.168.31.226:28093