SpringFramework DeferredResult和Hystrix

Question

我想知道在对要立即返回对象的方法上返回DeferredResult的方法上使用@HysterixCommand注释有什么区别吗？这是我的代码示例

@HystrixCommand(fallbackMethod = "getAlertsFallbackMethod")
public DeferredResult<List<AlertsBodyVO>> getAlerts(String userId) {
    LOGGER.info("Entered getAlerts - userId:{}", userId);
    final DeferredResult<List<AlertsBodyVO>> alertsDeferredResult = new DeferredResult<>();

    try {
        String requestURI = alertsEndpoint + userId.toUpperCase();
        LOGGER.info("requestURI:{}", requestURI);

        HttpHeaders headers = buildHttpHeader(userName, password);
        LOGGER.info("headers:{}", headers);
        HttpEntity<String> request = new HttpEntity<>(headers);
        LOGGER.info("request:{}", request);
        ResponseEntity<AlertsResponseVO> responseEntity = syncRestTemplate.exchange(requestURI, HttpMethod.GET, request, AlertsResponseVO.class);
        LOGGER.info("responseEntity:" + responseEntity);

        List<AlertsBodyVO> alertsBodyList = Arrays.asList(responseEntity.getBody().getAlertsBody());
        alertsDeferredResult.setResult(alertsBodyList);

    } catch (final RestClientException rce) {
        LOGGER.error("ServiceImpl::getAlerts: failed for user__{}, --Cause::", userId, rce);
        ErrorResponseVO alertsResponse = new ErrorResponseVO();
        alertsResponse.setErrorMessage("ServiceImpl::getAlerts: failed for user__" + userId );
        alertsDeferredResult.setErrorResult(alertsResponse);
    }
    LOGGER.info("Exiting:{}", alertsDeferredResult);
    return alertsDeferredResult;
}

public DeferredResult<List<AlertsBodyVO>> getAlertsFallbackMethod(String userId) {
    final DeferredResult<List<AlertsBodyVO>> alertsDeferredResult = new DeferredResult<>();
    LOGGER.info("CircuitBreaker:Fallback method for getAlerts returning empty object::userId: {}",userId);
    return alertsDeferredResult;
}

此行之后

 ResponseEntity<AlertsResponseVO> responseEntity = syncRestTemplate.exchange(requestURI, HttpMethod.GET, request, AlertsResponseVO.class)

1秒后调用回退方法。 我在日志中看到restTemplate成功完成。

对于Hysterix-我使用的是默认设置，在其他返回对象的方法中，这对我来说效果很好。

如果任何人都可以提供有关此行为的任何见解，将不胜感激。