利用伪码解码器处理伪码错误

Question

我已经创建了服务'A'，它需要由服务'B'通过使用假客户端调用，如果服务'A'由于某些验证而失败，那么服务'A'会发送回包含以下详细信息的错误响应，(1)http状态代码（2）错误消息（3）自定义错误映射，它包含自定义错误代码和它们的错误消息，例如<“EMP-1001”，“无效雇员ID”>

请就此提供一些建议

Answer 1

您可以启用断路器,也可以根据返回的错误配置应用程序以应用不同的回退方法,请执行以下步骤：

1.-使能断路器本身

@SpringBootApplication
@EnableFeignClients("com.perritotutorials.feign.client")
@EnableCircuitBreaker
public class FeignDemoClientApplication {

2.-创建回退bean

@Slf4j
@Component
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class PetAdoptionClientFallbackBean implements PetAdoptionClient {
@Setter
    private Throwable cause;
@Override
    public void savePet(@RequestBody Map<String, ?> pet) {
        log.error("You are on fallback interface!!! - ERROR: {}", cause);
    }
}

null

public class MyErrorDecoder implements ErrorDecoder {
private final ErrorDecoder defaultErrorDecoder = new Default();
@Override
    public Exception decode(String methodKey, Response response) {
        if (response.status() >= 400 && response.status() <= 499) {
            return new MyCustomBadRequestException();
        }
if (response.status() >= 500) {
            return new RetryableException();
        }
        return defaultErrorDecoder.decode(methodKey, response);
    }
}

@Bean
public MyErrorDecoder myErrorDecoder() {
  return new MyErrorDecoder();
}

@Bean
public Retryer retryer() {
    return new Retryer.Default();
}

您还可以将自定义项添加到复试器：

class CustomRetryer implements Retryer {
private final int maxAttempts;
    private final long backoff;
    int attempt;
public CustomRetryer() {
        this(2000, 5); //5 times, each 2 seconds
    }
public CustomRetryer(long backoff, int maxAttempts) {
        this.backoff = backoff;
        this.maxAttempts = maxAttempts;
        this.attempt = 1;
    }
public void continueOrPropagate(RetryableException e) {
        if (attempt++ >= maxAttempts) {
            throw e; 
        }
try {
            Thread.sleep(backoff);
        } catch (InterruptedException ignored) {
            Thread.currentThread().interrupt();
        }
    }
@Override
    public Retryer clone() {
        return new CustomRetryer(backoff, maxAttempts);
    }
}

如果您想获得一个关于如何在应用程序中实现Feign的函数示例，请阅读本文。