一, Feign是自带断路器的

feign.hystrix.enabled=true  是否开启熔断器

hystrix.command.default.execution.timeout.enabled=true  是否开启超时熔断, 如果为false, 则熔断机制只在服务不可用时开启

hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=300   设置超时熔断时间

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1. @FeignClient(value = "YunCai-SearchServer", fallback=ServiceHystrix.class)

2. public interface SchedualServiceHi {

3. @RequestMapping(value = "/luke/itemsearch",method = RequestMethod.GET)

4. ResponseMap sayHiFromClientOne(@RequestParam(value = "start") Integer start,

5. @RequestParam(value = "rows") Integer rows,

6. @RequestParam(value = "tenantId") Integer tenantId,

7. @RequestParam(value = "status") Integer status,

8. @RequestParam(value = "key") String key);

9. }

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1. @Component

2. public class ServiceHystrix implements SchedualServiceHi {

3. @Override

4. public ResponseMap sayHiFromClientOne(Integer start, Integer rows, Integer tenantId, Integer status, String key) {

5. SearchResult result = new SearchResult(0, new ArrayList<>(Arrays.asList(1L,2L,3L)));

6. return new ResponseMap(false, "111", 506, result);

7. }

8. }

二, Hystrix 仪表盘

首选在pom.xml引入spring-cloud-starter-hystrix-dashboard的起步依赖：

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2. org.springframework.boot

3. spring-boot-starter-actuator

6. org.springframework.cloud

7. spring-cloud-starter-hystrix-dashboard

在主程序启动类中加入@EnableHystrixDashboard注解，开启hystrixDashboard：

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1. @SpringBootApplication

2. @EnableDiscoveryClient

3. @EnableHystrix

4. @EnableHystrixDashboard

5. public class ServiceRibbonApplication {

6. public static void main(String[] args) {

7. SpringApplication.run(ServiceRibbonApplication.class, args);

8. }

9. @Bean

10. @LoadBalanced

11. RestTemplate restTemplate() {

12. return new RestTemplate();

13. }

14. }

打开浏览器：访问http://localhost:8764/hystrix,界面如下：

点击monitor stream，进入下一个界面，访问：http://localhost:8764/hi?name=forezp

此时会出现监控界面：