跟我學Spring Cloud(Finchley版)-14-Feign使用Hystrix
阿新 • • 發佈:2019-01-21
client nbu vid 直接 所有 配套 class 禁用 scope Feign默認已經整合了Hystrix,本節詳細探討Feign使用Hystrix的具體細節。
服務降級
-
加配置,默認Feign是不啟用Hystrix的,需要添加如下配置啟用Hystrix,這樣所有的Feign Client都會受到Hystrix保護!
feign: hystrix: enabled: true
-
提供Fallback:
@FeignClient(name = "microservice-provider-user", fallback = UserFeignClientFallback.class) public interface UserFeignClient { @GetMapping("/users/{id}") User findById(@PathVariable("id") Long id); } @Component class UserFeignClientFallback implements UserFeignClient { @Override public User findById(Long id) { return new User(id, "默認用戶", "默認用戶", 0, new BigDecimal(1)); } }
獲得造成fallback的原因
@FeignClient(name = "microservice-provider-user", fallbackFactory = UserFeignClientFallbackFactory.class) public interface UserFeignClient { @GetMapping("/users/{id}") User findById(@PathVariable("id") Long id); } @Component @Slf4j class UserFeignClientFallbackFactory implements FallbackFactory<UserFeignClient> { @Override public UserFeignClient create(Throwable throwable) { return new UserFeignClient() { @Override public User findById(Long id) { log.error("進入回退邏輯", throwable); return new User(id, "默認用戶", "默認用戶", 0, new BigDecimal(1)); } }; } }
Feign啟用/禁用Hystrix
全局啟用
feign.hystrix.enabled: true
全局禁用
feign.hystrix.enabled: false
或直接省略不寫。
局部啟用
利用Feign配置的自定義,為指定Feign Client指定如下配置類即可,Feign配置自定義詳見:跟我學Spring Cloud(Finchley版)-10-Feign深入
public class FeignDisableHystrixConfiguration { @Bean @Scope("prototype") public HystrixFeign.Builder feignBuilder() { return HystrixFeign.builder(); } }
局部禁用
public class FeignDisableHystrixConfiguration {
@Bean
@Scope("prototype")
public Feign.Builder feignBuilder() {
return Feign.builder();
}
}
配套代碼
服務降級:
- GitHub:<https://github.com/eacdy/spring-cloud-study/tree/master/2018-Finchley/microservice-consumer-movie-feign-hystrix>
- Gitee:<https://gitee.com/itmuch/spring-cloud-study/tree/master/2018-Finchley/microservice-consumer-movie-feign-hystrix>
獲得造成fallback的原因:
- GitHub:<https://github.com/eacdy/spring-cloud-study/tree/master/2018-Finchley/microservice-consumer-movie-feign-hystrix-fallback-factory>
- Gitee:<https://gitee.com/itmuch/spring-cloud-study/tree/master/2018-Finchley/microservice-consumer-movie-feign-hystrix-fallback-factory>
本文首發
<http://www.itmuch.com/spring-cloud/finchley-14/>
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跟我學Spring Cloud(Finchley版)-14-Feign使用Hystrix