一、fallback

1. yml

   server:
     port: 80
   
   spring:
     application:
       name: cloud-provider-hystrix-order
   
   eureka:
     client:
       register-with-eureka: true    #示表不向注册中心注册自己
       fetch-registry: true   #表示自己就是注册中心，职责是维护服务实例，并不需要去检索服务
       service-url:
         defaultZone: http://eureka7001.com:7001/eureka/
   
   ####################以下配置需要新增(ribbon相关配置和Feign超时相关)##################
   #全局配置
   # 请求连接的超时时间 默认的时间为 1 秒
   ribbon:
     ConnectTimeout: 5000
     # 请求处理的超时时间
     ReadTimeout: 5000
   
   # feign 配置
   feign:
     hystrix:
       enabled: true
   
   # hystrix 配置
   hystrix:
     command:
       default:
         execution:
           isolation:
             thread:
               timeoutInMilliseconds: 3000
   

2. service

   @Component
   @FeignClient(value = "CLOUD-PROVIDER-HYSTRIX-PAYMENT",fallback = PaymentHystixServiceFallBackImpl.class)
   public interface PaymentHystrixService {
       @GetMapping("/payment/hystrix/ok/{id}")
       String paymentInfo_OK(@PathVariable("id") Integer id);
   
       @GetMapping("/payment/hystrix/timeout/{id}")
       String paymentInfo_TimeOut(@PathVariable("id") Integer id);
   
   }
   

3. fallbackImpl

   @Component
   public class PaymentHystixServiceFallBackImpl implements PaymentHystrixService {
   
       @Override
       public String paymentInfo_OK(Integer id) {
           return "服务降级";
       }
   
       @Override
       public String paymentInfo_TimeOut(Integer id) {
           return "服务降级";
       }
   
   }
   

二、fallbackFactory

1. yml同上

2. service

   @Component
   @FeignClient(value = "CLOUD-PROVIDER-HYSTRIX-PAYMENT",fallbackFactory = PaymentHytrixServiceFallBackFactory.class)
   public interface PaymentHystrixService {
       @GetMapping("/payment/hystrix/ok/{id}")
       String paymentInfo_OK(@PathVariable("id") Integer id);
   
       @GetMapping("/payment/hystrix/timeout/{id}")
       String paymentInfo_TimeOut(@PathVariable("id") Integer id);
   
   }
   

3. fallbackFactory

   @Component
   public class PaymentHytrixServiceFallBackFactory implements FallbackFactory<PaymentHystrixService> {
   
       @Override
       public PaymentHystrixService create(Throwable throwable) {
           return new PaymentHystrixService() {
               @Override
               public String paymentInfo_OK(Integer id) {
                   return "服务降级";
               }
   
               @Override
               public String paymentInfo_TimeOut(Integer id) {
                   return "服务降级";
               }
           };
       }
   }
   

三、两者结合

1. fallbackImpl同一

2. 修改fallbackFactory

   @Component
   public class PaymentHytrixServiceFallBackFactory implements FallbackFactory<PaymentHystrixService> {
   
       @Override
       public PaymentHystrixService create(Throwable throwable) {
           PaymentHystixServiceFallBackImpl paymentHystixServiceFallBack = new PaymentHystixServiceFallBackImpl();
           return paymentHystixServiceFallBack;
       }
   }