How to use

Resp$FallbackException

in

com.ecfront.dew.common

@RequestMapping()
@ResponseBody
public Object error(HttpServletRequest request) {
  Object specialError = request.getAttribute(SPECIAL_ERROR_FLAG);
  if (specialError instanceof Resp.FallbackException) {
    return ResponseEntity.status(FALL_BACK_STATUS).contentType(MediaType.APPLICATION_JSON_UTF8).body(((Resp.FallbackException) specialError).getMessage());
  }
  Map<String, Object> error = getErrorAttributes(request, true);
  String path;
  if (error.containsKey("path")) {
    path = (String) error.getOrDefault("path", Dew.context().getRequestUri());
  } else {
    path = ((RequestFacade) ((ServletRequestWrapper) request).getRequest()).getRequestURI();
  }
  int statusCode = (int) error.getOrDefault("status", -1);
  String message = error.getOrDefault("message", "").toString();
  String exClass = (String) error.getOrDefault("exception", "");
  String exMsg = (String) error.getOrDefault("error", "");
  List exDetail = null;
  if (error.containsKey("errors") && !((List) error.get("errors")).isEmpty()) {
    exDetail = (List) error.get("errors");
  }
  Object[] result = error(request, path, statusCode, message, exClass, exMsg, exDetail, (Throwable) specialError);
  if (statusCode > 499) {
    // 服务错误才通知
    Dew.notify.sendAsync(Dew.dewConfig.getBasic().getFormat().getErrorFlag(), (Throwable) specialError, ((Throwable) specialError).getMessage());
  }
  return ResponseEntity.status((int) result[0]).contentType(MediaType.APPLICATION_JSON_UTF8).body(result[1]);
}

@RequestMapping()
@ResponseBody
public Object error(HttpServletRequest request) {
  Object specialError = request.getAttribute(SPECIAL_ERROR_FLAG);
  if (specialError instanceof Resp.FallbackException) {
    addRequestRecord(request);
    return ResponseEntity.status(FALL_BACK_STATUS).contentType(MediaType.APPLICATION_JSON_UTF8).body(((Resp.FallbackException) specialError).getMessage());
  }
  Map<String, Object> error = getErrorAttributes(request, false);
  String path = (String) error.getOrDefault("path", Dew.context().getRequestUri());
  int statusCode = (int) error.getOrDefault("status", -1);
  String message = error.getOrDefault("message", "").toString();
  String exClass = (String) error.getOrDefault("exception", "");
  String exMsg = (String) error.getOrDefault("error", "");
  List exDetail = null;
  if (error.containsKey("errors") && !((List) error.get("errors")).isEmpty()) {
    exDetail = (List) error.get("errors");
  }
  Object[] result = error(request, path, statusCode, message, exClass, exMsg, exDetail, (Throwable) specialError);
  return ResponseEntity.status((int) result[0]).contentType(MediaType.APPLICATION_JSON_UTF8).body(result[1]);
}

/**
 * 声明返回需要降级
 *
 */
public Resp fallback(){
  if(true) {
    throw new FallbackException(this);
  }
  // 使用返回值是为了保持结构统一
  return this;
}