code: public ServiceFuture<List<DatabaseInner>> listByElasticPoolAsync(final String resourceGroupName, final String serverName, final String elasticPoolName, final ListOperationCallback<DatabaseInner> serviceCallback) {
          return AzureServiceFuture.fromPageResponse(
              listByElasticPoolSinglePageAsync(resourceGroupName, serverName, elasticPoolName),
              new Func1<String, Observable<ServiceResponse<Page<DatabaseInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<DatabaseInner>>> call(String nextPageLink) {
                      return listByElasticPoolNextSinglePageAsync(nextPageLink);
                  }
              },
              serviceCallback);
      }
docs: Gets a list of databases in an elastic pool.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param elasticPoolName The name of the elastic 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