SpringCloud学习笔记（14）----Spring Cloud Netflix之Hystrix对Feign的支持,SpringCloud学习笔记（14）----Spring Cloud Netflix之Hystrix对Feign的支持

佚名 6年前 (2019-05-10) 随笔 1455人围观抢沙发百度已收录

1. Hystrix对Feign的支持

　　添加Feign中IUserBiz的实现类HystrixFallBack：

SRE实战互联网时代守护先锋，助力企业售后服务体系运筹帷幄！一键直达领取阿里云限量特价优惠。

package com.wangx.cloud.springcloud02consumer.configure; import com.wangx.cloud.springcloud02consumer.api.UserApi; import org.springframework.stereotype.Component; @Component public class HystrixFallBack implements UserApi { @Override public String getUser(Integer id) { System.out.println("连接超时....."); return "system error"; } }

　　使用@component注解注册成组件。在@FeignClient注解里面添加fallback属性即可。

　　如下：

package com.wangx.cloud.springcloud02consumer.api; import com.wangx.cloud.springcloud02consumer.configure.FooConfiguration; import com.wangx.cloud.springcloud02consumer.configure.HystrixFallBack; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; @FeignClient(value = "spring-cloud-provider", configuration = FooConfiguration.class, fallback = HystrixFallBack.class) public interface UserApi { @RequestMapping(value = "/user/getUser") String getUser(@RequestParam(value = "id") Integer id); }

　　当出现请求错误或超时时，就会执行实现类中的方法。

　　熔断设置

#默认为false，如果想用断路由，要打开这个设置
feign.hystrix.enabled=true #断路器线程池超时时间,这个值一定要比ribbon超时时间长，毫秒 hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=16000

　　单个应用禁用Hystrix

　　在FooConfiguration中配置一个bean

package com.wangx.cloud.springcloud02consumer.configure; import feign.Feign; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Scope; @Configuration public class FooConfiguration { @Bean @Scope("prototype") public Feign.Builder feignBuilder() { return Feign.builder(); } }

　　配置隔离级别

# 在feign和Ribbon里面配置隔离策略（全局配置）
#hystrix.command.default.execution.isolation.strategy=SEMAPHORE # 配置单个 ystrixCommandKey在Ribbon下面默认为方法名，在feign下面默认为类名#方法名（参数类型） #hystrix.command.HystrixCommandKey.execution.isolation.strategy=SEMAPHORE

　　说明：HystrixCommandKey在Ribbon下面默认为方法名，在feign下面默认为类名#方法名（参数类型）

　　Feign下的HystrixCommandKey类的配置

package com.wangx.cloud.springcloud02consumer.configure; import com.netflix.hystrix.HystrixCommand; import com.netflix.hystrix.HystrixCommand.Setter; import com.netflix.hystrix.HystrixCommandGroupKey; import com.netflix.hystrix.HystrixCommandKey; import feign.Feign; import feign.Target; import feign.hystrix.HystrixFeign; import feign.hystrix.SetterFactory; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Scope; import java.lang.reflect.Method; @Configuration public class FooConfiguration { @Bean @Scope("prototype") public Feign.Builder feignBuilder() { class RcSetterFactory implements SetterFactory { @Override public Setter create(Target<?> target, Method method) { String groupKey = target.name(); String commandKey = method.getName(); return HystrixCommand.Setter.withGroupKey(HystrixCommandGroupKey.Factory.asKey(groupKey)) .andCommandKey(HystrixCommandKey.Factory.asKey(commandKey)); } } return HystrixFeign.builder().setterFactory(new RcSetterFactory()); //return Feign.builder();  } }

原文 SpringCloud学习笔记（14）----Spring Cloud Netflix之Hystrix对Feign的支持