code: public ServiceFuture<SummarizeResultsInner> summarizeForSubscriptionLevelPolicyAssignmentAsync(String subscriptionId, String policyAssignmentName, QueryOptions queryOptions, final ServiceCallback<SummarizeResultsInner> serviceCallback) {
          return ServiceFuture.fromResponse(summarizeForSubscriptionLevelPolicyAssignmentWithServiceResponseAsync(subscriptionId, policyAssignmentName, queryOptions), serviceCallback);
      }
docs: Summarizes policy states for the subscription level policy assignment.
  
  @param subscriptionId Microsoft Azure subscription ID.
  @param policyAssignmentName Policy assignment name.
  @param queryOptions Additional parameters for the operation
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object