OpenFeign整合我们的Sentinel

OpenFeign整合我们的Sentinel

• 第一步加配置: 在tulingvip05-ms-alibaba-feignwithsentinel-order上 pom.xml中添加配置

<dependency>
	<groupId>com.tulinggroupId>
	<artifactId>03-ms-alibaba-feign-apiartifactId>
	<version>0.0.1-SNAPSHOTversion>
dependency>


<dependency>
	<groupId>com.alibaba.cloudgroupId>
	<artifactId>spring-cloud-starter-alibaba-sentinelartifactId>
dependency>


<dependency>
	<groupId>org.springframework.bootgroupId>
	<artifactId>spring-boot-starter-actuatorartifactId>
dependency>

• 第二步:在我们的Feign的声明式接口上添加fallback属性或者 fallbackFactory属性
  1）为我们添加fallback属性的api

@FeignClient(name = "product-center",fallback = ProductCenterFeignApiWithSentinelFallback.class)
/*
@FeignClient(name = "product-center",fallbackFactory = ProductCenterFeignApiWithSentielFallbackFactory.class)
*/
public interface ProductCenterFeignApiWithSentinel {

    /**
     * 声明式接口,远程调用http://product-center/selectProductInfoById/{productNo}
     * @param productNo
     * @return
     */
    @RequestMapping("/selectProductInfoById/{productNo}")
    ProductInfo selectProductInfoById(@PathVariable("productNo") String productNo);

}

我们feign的限流降级接口(通过fallback没有办法获取到异常的)

@Component
public class ProductCenterFeignApiWithSentinelFallback implements ProductCenterFeignApiWithSentinel {
    @Override
    public ProductInfo selectProductInfoById(String productNo) {
        ProductInfo productInfo = new ProductInfo();
        productInfo.setProductName("默认商品");
        return productInfo;
    }
}

2)通过FallbackFactory属性可以处理我们的异常

/*
@FeignClient(name = "product-center",fallback = ProductCenterFeignApiWithSentinelFallback.class)*/
@FeignClient(name = "product-center",fallbackFactory = ProductCenterFeignApiWithSentielFallbackFactory.class)
public interface ProductCenterFeignApiWithSentinel {

    /**
     * 声明式接口,远程调用http://product-center/selectProductInfoById/{productNo}
     * @param productNo
     * @return
     */
    @RequestMapping("/selectProductInfoById/{productNo}")
    ProductInfo selectProductInfoById(@PathVariable("productNo") String productNo);

}

@Component
@Slf4j
public class ProductCenterFeignApiWithSentielFallbackFactory implements FallbackFactory<ProductCenterFeignApiWithSentinel> {
    @Override
    public ProductCenterFeignApiWithSentinel create(Throwable throwable) {
        return new ProductCenterFeignApiWithSentinel(){

            @Override
            public ProductInfo selectProductInfoById(String productNo) {
                ProductInfo productInfo = new ProductInfo();
                if (throwable instanceof FlowException) {
                    log.error("流控了....{}",throwable.getMessage());
                    productInfo.setProductName("我是被流控的默认商品");
                }else {
                    log.error("降级了....{}",throwable.getMessage());
                    productInfo.setProductName("我是被降级的默认商品");
                }

                return productInfo;
            }
        };
    }
}