spring cloud: Hystrix(五):如禁止单个FeignClient使用hystrix
首先application.yml / applicatoin.propreties的配置项:feign.hystrix.enabled=true是针对全局的。
feign.hystrix.enabled=true 或者 feign: hystrix: enabled: true
那么怎么配置禁止单个的FeignClient使用hystrix呢。
在自定义的configuration.java的配置文件里加入:
//关闭feign的hystrix @Bean @Scope("property") public Feign.Builder feignBuilder() { return Feign.builder(); }
例子:复写Feign的默认配置(fooConfiguration.java)
看例子:
1.入口文件,开启eureka, feign配置
@EnableEurekaClient @SpringBootApplication @EnableFeignClients public class FeignApp { public static void main(String[] args) { SpringApplication.run(FeignApp.class, args); } }
2.复写Feign的默认配置(fooConfiguration.java, fooConfiguration2.java,这两个文件一个是关闭hystrix的,一个没有关闭)
a.返回默认的feign配置
@Configuration public class FooConfiguration { @Bean public Contract feignContract() { return new feign.Contract.Default(); } }
b.返回默认的feign配置,以及关闭Hystrix
@Configuration public class FooConfiguration2 { /** * 配置Url用户和密码,当eureka启用用户名和密码时 * @return */ /*@Bean public BasicAuthRequestInterceptor basicAuthRequestInterceptor() { return new BasicAuthRequestInterceptor("root", "root123"); }*/ //默认配置 @Bean public Contract getContract() { return new feign.Contract.Default(); } //feign日志配置 @Bean Logger.Level feignLoggerLevel() { return Logger.Level.FULL; } //关闭feign的hystrix @Bean @Scope("prototype") public Feign.Builder feignBuilder() { return Feign.builder(); } }
3.FeignClient的代码
a.调取spring-boot-user服务器
@FeignClient(name="spring-boot-user", configuration=FooConfiguration.class, fallback=HystrixClientFallback.class) public interface UserFeignClient { /** * 代用feign原生模式 * @param id * @return */ @RequestLine("GET /simple/{id}") public User findById(@Param("id") Long id); }
b.调取eureka的apps/serviceName(要填入具体项目名称)服务
/** * 当@FeignClient有name和url还有configuration时,取值为url的地址,name只是为一个名称而已(无意义) * 当@FeignClient只有name和configuration时,name的取值为eureka中的application项目的名称即虚拟地址 * @author Administrator * */ @FeignClient(name="boot-user", url="http://localhost:8761", configuration=FooConfiguration2.class, fallback=HystrixClientFallback2.class) public interface UserFeignClient2 { @RequestLine("GET /eureka/apps/{serviceName}") public String findServiceInfoFromEurekaByServiceName(@Param("serviceName") String serviceName); //@RequestLine("GET /simple/{id}") //public User findById(@Param("id") Long id); }
4.fallback方法,hystrix的断容器代码
a.
@Component public class HystrixClientFallback implements UserFeignClient{ @Override public User findById(Long id) { // TODO Auto-generated method stub User user = new User(); user.setId(0L); return user; } }
b.直接返回字符
@Component public class HystrixClientFallback2 implements UserFeignClient2 { @Override public String findServiceInfoFromEurekaByServiceName(String serviceName) { // TODO Auto-generated method stub return "hahah"; } }
5.controller代码
@RestController public class UserController { @Autowired private UserFeignClient userFeignClient; @Autowired private UserFeignClient2 userFeignClient2; @GetMapping("/simple/{id}") public User findById(@PathVariable Long id) { return this.userFeignClient.findById(id); } @GetMapping("/eureka/apps/{serviceName}") public String findEurekaInfo(@PathVariable String serviceName) { return this.userFeignClient2.findServiceInfoFromEurekaByServiceName(serviceName); } }
6测试
a.eureka服务,spring-boot-user服务未关闭的情况
b.eureka服务器、spring-boot-user服务器关闭