code: public ServiceFuture<List<RoleInner>> listByDataBoxEdgeDeviceAsync(final String deviceName, final String resourceGroupName, final ListOperationCallback<RoleInner> serviceCallback) {
          return AzureServiceFuture.fromPageResponse(
              listByDataBoxEdgeDeviceSinglePageAsync(deviceName, resourceGroupName),
              new Func1<String, Observable<ServiceResponse<Page<RoleInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<RoleInner>>> call(String nextPageLink) {
                      return listByDataBoxEdgeDeviceNextSinglePageAsync(nextPageLink);
                  }
              },
              serviceCallback);
      }
docs: Lists all the roles configured in a data box edge/gateway device.
  
  @param deviceName The device name.
  @param resourceGroupName The resource group name.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object