FeignClient中使用熔断机制hystrix

冷不防 2022-05-27 01:18 351阅读 0赞

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

**\[java\]**  [view plain][]   [copy][view plain]

1.  @FeignClient(value = "YunCai-SearchServer", fallback=ServiceHystrix.class)  
2.  public interface SchedualServiceHi \{  
3.    
4.      @RequestMapping(value = "/luke/itemsearch",method = RequestMethod.GET)  
5.      ResponseMap sayHiFromClientOne(@RequestParam(value = "start") Integer start,  
6.              @RequestParam(value = "rows") Integer rows,  
7.              @RequestParam(value = "tenantId") Integer tenantId,  
8.              @RequestParam(value = "status") Integer status,  
9.              @RequestParam(value = "key") String key);  
10. \}

**\[java\]**  [view plain][]   [copy][view plain]

1.  @Component  
2.  public class ServiceHystrix implements SchedualServiceHi \{  
3.    
4.      @Override  
5.      public ResponseMap sayHiFromClientOne(Integer start, Integer rows, Integer tenantId, Integer status, String key) \{  
6.          SearchResult result = new SearchResult(0, new ArrayList<>(Arrays.asList(1L,2L,3L)));  
7.          return new ResponseMap(false, "111", 506, result);  
8.      \}  
9.  \}

二, Hystrix 仪表盘

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

**\[java\]**  [view plain][]   [copy][view plain]

1.  <dependency>  
2.              <groupId>org.springframework.boot</groupId>  
3.              <artifactId>spring-boot-starter-actuator</artifactId>  
4.          </dependency>  
5.    
6.          <dependency>  
7.              <groupId>org.springframework.cloud</groupId>  
8.              <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>  
9.          </dependency>

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

**\[java\]**  [view plain][]   [copy][view plain]

1.  @SpringBootApplication  
2.  @EnableDiscoveryClient  
3.  @EnableHystrix  
4.  @EnableHystrixDashboard  
5.  public class ServiceRibbonApplication \{  
6.    
7.      public static void main(String\[\] args) \{  
8.          SpringApplication.run(ServiceRibbonApplication.class, args);  
9.      \}  
10.   
11.     @Bean  
12.     @LoadBalanced  
13.     RestTemplate restTemplate() \{  
14.         return new RestTemplate();  
15.     \}  
16.   
17. \}

打开浏览器：访问[http://localhost:8764/hystrix][http_localhost_8764_hystrix],界面如下：

![Paste\_Image.png][Paste_Image.png]

点击monitor stream，进入下一个界面，访问：[http://localhost:8764/hi?name=forezp][http_localhost_8764_hi_name_forezp]

此时会出现监控界面：

![Paste\_Image.png][Paste_Image.png 1]

[view plain]: https://blog.csdn.net/asdfsadfasdfsa/article/details/79286960#
[http_localhost_8764_hystrix]: http://localhost:8764/hystrix
[Paste_Image.png]: /images/20220527/806281e84fd64b4c8a638b2f0969510b.png
[http_localhost_8764_hi_name_forezp]: http://localhost:8764/hi?name=forezp
[Paste_Image.png 1]: /images/20220527/09a196acb2ef4479a601c774956d727e.png