SpringCloud之Feign与Hystrix的整合

- 日理万妓 2024-02-18 21:12 57阅读 0赞

**配置信息**

server:
      port: 8010
    spring:
      application:
        name: microservice-consumer-order
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
      instance:
        prefer-ip-address: true
    
    feign:
      hystrix:
        enabled: true
    # 说明：请务必注意，从Spring Cloud Dalston开始，Feign默认是不开启Hystrix的。
    # 因此，如使用Dalston请务必额外设置属性：feign.hystrix.enabled=true，否则
    断路器不会生效。
    # 而，Spring Cloud Angel/Brixton/Camden中，Feign默认都是开启Hystrix的。
    无需设置该属性。

**UserFeignClient**

/**
     * Feign的fallback测试
     * 使用@FeignClient的fallback属性指定回退类
     */
    @FeignClient(name = "microservice-provider-user",
     fallback = FeignClientFallback.class/*, 
     configuration = FeignDisableHystrixConfiguration.class*/)
    public interface UserFeignClient {
        
      @RequestMapping(value = "/{id}", method = RequestMethod.GET)
      public User findById(@PathVariable("id") Long id);
    
    }
    
    /**
     * 回退类FeignClientFallback需实现Feign Client接口
     * FeignClientFallback也可以是public class，没有区别
     */
    @Component
    class FeignClientFallback implements UserFeignClient {
      @Override
      public User findById(Long id) {
        User user = new User();
        user.setId(-1L);
        user.setUsername("默认用户");
        return user;
      }
    }

**OrderController**

@RestController
    public class OrderController {
        
      @Autowired
      private UserFeignClient userFeignClient;
    
      @GetMapping("/user/{id}")
      public User findById(@PathVariable Long id) {
        return userFeignClient.findById(id);
      }
    }

**启动类不需要加Hystrix的注解,有配置文件配置**

@EnableDiscoveryClient
    @SpringBootApplication
    @EnableFeignClients
    public class ConsumerOrderApplication {
        
      public static void main(String[] args) {
        SpringApplication.run(ConsumerOrderApplication.class, args);
      }
    }

**Feign禁用Hystrix**

server:
      port: 8010
    spring:
      application:
        name: microservice-consumer-order
    eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8761/eureka/
      instance:
        prefer-ip-address: true
    
    feign:
      hystrix:
        enabled: false
    # 说明：请务必注意，从Spring Cloud Dalston开始，Feign默认是不开启Hystrix的。
    否则断路器不会生效。
    # 而，Spring Cloud Angel/Brixton/Camden中，Feign默认都是开启Hystrix的。
    无需设置该属性。

package com.tuling.cloud.study.user.feign;
    
    import org.springframework.cloud.netflix.feign.FeignClient;
    import org.springframework.stereotype.Component;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import com.tuling.cloud.study.user.entity.User;
    
    /**
     * Feign的fallback测试
     * 使用@FeignClient的fallback属性指定回退类
     */
    @FeignClient(name = "microservice-provider-user",
     fallback = FeignClientFallback.class, 
     configuration = FeignDisableHystrixConfiguration.class)
    public interface UserFeignClient {
        
      @RequestMapping(value = "/{id}", method = RequestMethod.GET)
      public User findById(@PathVariable("id") Long id);
    
    }
    
    /**
     * 回退类FeignClientFallback需实现Feign Client接口
     * FeignClientFallback也可以是public class，没有区别
     */
    @Component
    class FeignClientFallback implements UserFeignClient {
      @Override
      public User findById(Long id) {
        User user = new User();
        user.setId(-1L);
        user.setUsername("默认用户");
        return user;
      }
    }

/*
    *
    * 为Feign禁用Hystrix功能
    *
    */
    
    
    @Configuration
    public class FeignDisableHystrixConfiguration {
          
    
        @Bean  
        @Scope("prototype")   
        public Feign.Builder feignBuilder() {  
            return Feign.builder();  
        }  
    }