@Override
  public Set<Resource> getResources(Request request, Predicate predicate)
      throws SystemException, UnsupportedPropertyException, NoSuchResourceException, NoSuchParentResourceException {

    Set<String> requestedIds = getRequestPropertyIds(request, predicate);
    Set<Resource> resources = new HashSet<>();

    String maxResultsRaw = request.getRequestInfoProperties().get(BaseRequest.PAGE_SIZE_PROPERTY_KEY);
    String ascOrderRaw = request.getRequestInfoProperties().get(BaseRequest.ASC_ORDER_PROPERTY_KEY);

    Integer maxResults = (maxResultsRaw == null ? null : Integer.parseInt(maxResultsRaw));
    Boolean ascOrder = (ascOrderRaw == null ? null : Boolean.parseBoolean(ascOrderRaw));

    if (null == predicate) {
      authorizeGetResources(null);
      // the no-arg call to /requests is here
      resources.addAll(getRequestResources(null, null, null, maxResults, ascOrder, requestedIds));
    } else {
      // process /requests with a predicate
      // process /clusters/[cluster]/requests
      // process /clusters/[cluster]/requests with a predicate

      for (Map<String, Object> properties : getPropertyMaps(predicate)) {
        String clusterName = (String) properties.get(REQUEST_CLUSTER_NAME_PROPERTY_ID);

        Long requestId = null;
        if (properties.get(REQUEST_ID_PROPERTY_ID) != null) {
          requestId = Long.valueOf((String) properties.get(REQUEST_ID_PROPERTY_ID));
        }

        String requestStatus = null;
        if (properties.get(REQUEST_STATUS_PROPERTY_ID) != null) {
          requestStatus = (String) properties.get(REQUEST_STATUS_PROPERTY_ID);
        }

        authorizeGetResources(clusterName);
        resources.addAll(getRequestResources(clusterName, requestId, requestStatus, maxResults,
            ascOrder, requestedIds));
      }
    }

    return resources;
  }
Create a  new resource provider for the given management controller.

@param managementController the management controller
ambari-server/src/main/java/org/apache/ambari/server/controller/internal/RequestResourceProvider.java