code: public ServiceFuture<List<PoolNodeCounts>> listPoolNodeCountsAsync(final ListOperationCallback<PoolNodeCounts> serviceCallback) {
          return AzureServiceFuture.fromHeaderPageResponse(
              listPoolNodeCountsSinglePageAsync(),
              new Func1<String, Observable<ServiceResponseWithHeaders<Page<PoolNodeCounts>, AccountListPoolNodeCountsHeaders>>>() {
                  @Override
                  public Observable<ServiceResponseWithHeaders<Page<PoolNodeCounts>, AccountListPoolNodeCountsHeaders>> call(String nextPageLink) {
                      return listPoolNodeCountsNextSinglePageAsync(nextPageLink, null);
                  }
              },
              serviceCallback);
      }
docs: Gets the number of nodes in each state, grouped by pool.
  
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object