Sentinel整合Open Feign

1、环境搭建

以8884模块为例

pom文件添加依赖

<!-- openfign -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

yml添加

# 激活sentinel对feign的支持
feign:
  sentinel:
    enabled: true

启动类

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class OrderMain84 {
    public static void main(String[] args) {
        SpringApplication.run(OrderMain84.class, args);
    }
}

创建远程调用接口

@FeignClient(value = "nacos-payment-provider")
public interface PaymentService {

    @GetMapping("/payment/{id}")
    public CommonResult<Payment> payment(@PathVariable("id")Long id);
}

实现类（用于服务降级）

@Component
public class PaymentFallbackService implements PaymentService {
    @Override
    public CommonResult<Payment> payment(Long id) {
        return new CommonResult<Payment>(444, "服务降级返回--PaymentService", new Payment(id, "errorSerial"));
    }
}

接口指定降级的类

@FeignClient(value = "nacos-payment-provider", fallback = PaymentFallbackService.class)
public interface PaymentService {

    @GetMapping("/payment/{id}")
    public CommonResult<Payment> payment(@PathVariable("id")Long id);
}

controller

@Resource
private PaymentService service;

@GetMapping("/payment/{id}")
public CommonResult<Payment> payment(@PathVariable("id")Long id){
    return service.payment(id);
}

2、测试

启动9003、8884，如果中途9003出现问题关闭，8884服务降级成功

3、熔断框架比较

图片来源：尚硅谷 - 周阳 - Spring Cloud Alibaba