feign结合Hystrix使用

一导入依赖

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>

        <!--hystrix依赖，主要是用  @HystrixCommand -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

        <!--服务注册-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!--服务调用-->
       <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

二在配置文件中添加hystrix配置

#开启熔断机制
feign.hystrix.enabled=true
# 设置hystrix超时时间，默认1000ms
hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=6000

三在service-edu的client包里面创建熔断器的实现类

package com.atguigu.eduservice.client;

import com.atguigu.commonutils.R;
import org.springframework.stereotype.Component;

@Component
public class VodFileDegradeFeignClient implements VodeClient {
    //删除一个视频，出错之后会执行
    @Override
    public R removeAlyVideo(String id) {
        return R.error().message("视频出错了" );
    }
}

四修改VodClient接口的注解

package com.atguigu.eduservice.client;

import com.atguigu.commonutils.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.PathVariable;

@Component
@FeignClient(name = "service-vod",fallback = VodFileDegradeFeignClient.class)
public interface VodeClient {

    @DeleteMapping("/eduvod/video/removeAlyVideo/{id}")
    public R removeAlyVideo(@PathVariable("id") String id);
}