实践bug总结-Feign使用Hystrix配置

@Slf4j
@Component
public class AdditionCommand {
    @Autowired
    private AdditionClient additionClient;
    @HystrixCommand(fallbackMethod = "fallback")
    public ResponseEntity<ResultData> add(Integer a, Integer b) {
        // 模拟接口异常
        Random random = new Random();
        int r = random.nextInt(10);
        if (r % 2 == 0) {
            throw new RuntimeException();
        }
        return additionClient.add(a, b);
    }
    public ResponseEntity<ResultData> fallback(Integer a, Integer b) {
        ResultData resultData = new ResultData();
        Message message = Message.builder().code(10000).message("xxxx").build();
        resultData.setMessage(message);
        return ResponseEntity.ok(resultData);
    }
}

26. import com.gemantic.commons.ResultData;
27. import org.springframework.cloud.netflix.feign.FeignClient;
28. import org.springframework.http.ResponseEntity;
29. import org.springframework.web.bind.annotation.GetMapping;
30. import org.springframework.web.bind.annotation.RequestParam;
31. 
32. /**
33.  * @author Yezhiwei
34.  * @date 17/12/14
35.  */
36. @FeignClient(name = "springcloud-subtraction-service", fallback = SubtractionClientFallBack.class)
37. public interface SubtractionClient {
38. 
39.     /**
40.      * 减法接口
41.      * @param a
42.      * @param b
43.      * @return
44.      */
45.     @GetMapping(value = "/sub")
46.     ResponseEntity<ResultData> sub(@RequestParam("a") Integer a, @RequestParam("b") Integer b);
47. }
回调实现 SubtractionClient接口：
1. import com.gemantic.commons.ResultData;
2. import org.springframework.http.ResponseEntity;
3. import org.springframework.stereotype.Component;
4. import org.springframework.web.bind.annotation.RequestParam;
5. 
6. /**
7.  * @author Yezhiwei
8.  * @date 17/12/14
9.  */
10. @Component
11. public class SubtractionClientFallBack implements SubtractionClient {
12.     @Override
13.     public ResponseEntity<ResultData> sub(@RequestParam("a") Integer a, @RequestParam("b") Integer b) {
14.         // 这里是实现的回调逻辑！
15.         return null;
16.     }
17. }