SpringCloud2微服务Hystrix服务降级案例

古城微笑少年丶 2023-05-21 13:59 10阅读 0赞

### 一、相关依赖 ###

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

### 二、案例核心代码 ###

1）、方式一：通过@HystrixCommand方法的方式给部分接口配置单独的线程池实现服务降级

对外FeigClient案例代码

@FeignClient(name = "app-kingseok-framework")
    public interface FrameworkServiceFeign extends IUserService {
    
    }

本地服务案例代码

@RestController
    public class PatientServiceImpl extends BaseApiService implements IPatientService {
    
        /**
         * framework服务
         */
        @Autowired
        private FrameworkServiceFeign frameworkServiceFeign;
    
    
    
        /**
         * 处理了雪崩 服务降级执行
         *  HystrixCommand默认开启线程池隔离方式，服务降级，服务熔断
         * @return ResponseBase
         */
        @HystrixCommand(fallbackMethod = "patientToUserInfoHystrixFallback")
        @RequestMapping("/patientToUserInfoHystrix")
        public ResponseBase patientToUserInfoHystrix() {
            System.out.println("patientToUserInfoHystrix线程池名称："+Thread.currentThread().getName());
            return frameworkServiceFeign.getUserInfo();
        }
        public  ResponseBase patientToUserInfoHystrixFallback(){
            return setResultSuccess("返回一个友好的提示:服务降级！服务器忙，请稍后重试！");
        }
    
    }

2）、方式二：通过类方式给整个对外服务配置独立线程池

服务降级类

@Component
    public class FrameworkServiceFallback extends BaseApiService implements FrameworkServiceFeign {
    
        @Override
        public ResponseBase getUserInfo() {
            return setResultError("服务器忙，走服务降级");
        }
    }

对外FeigClient案例代码

@FeignClient(name = "app-kingseok-framework",fallback = FrameworkServiceFallback.class)
    public interface FrameworkServiceFeign extends IUserService {
    }

本地服务类

@RestController
    public class PatientServiceImpl extends BaseApiService implements IPatientService {
    
        /**
         * framework服务
         */
        @Autowired
        private FrameworkServiceFeign frameworkServiceFeign;
    
    
        @RequestMapping("/patientToUserInfoHystrixDemo2")
        public ResponseBase patientToUserInfoHystrixDemo2() {
            System.out.println("patientToUserInfoHystrix线程池名称："+Thread.currentThread().getName());
            return frameworkServiceFeign.getUserInfo();
        }
    
    }

###  三、JMeter测试结果 ###

1）、压测前

![20200419120618557.png][]

2）、压测后

编写压测脚本

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3htMzkzMzkyNjI1_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3htMzkzMzkyNjI1_size_16_color_FFFFFF_t_70 1][]

结果

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3htMzkzMzkyNjI1_size_16_color_FFFFFF_t_70 2][]

## ##

[20200419120618557.png]: /images/20230521/17f2a71a406d4f81bd9c5a1c592f7d08.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3htMzkzMzkyNjI1_size_16_color_FFFFFF_t_70]: /images/20230521/a69f2417524642fda7a11c76141c3981.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3htMzkzMzkyNjI1_size_16_color_FFFFFF_t_70 1]: /images/20230521/5f33023e2f8a4dfda5f71e231720cc4a.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3htMzkzMzkyNjI1_size_16_color_FFFFFF_t_70 2]: /images/20230521/fe81173a5a494d41bf9e61e88ab93fb0.png