code: public ServiceFuture<List<ExpressRouteCrossConnectionPeeringInner>> listAsync(final String resourceGroupName, final String crossConnectionName, final ListOperationCallback<ExpressRouteCrossConnectionPeeringInner> serviceCallback) {
          return AzureServiceFuture.fromPageResponse(
              listSinglePageAsync(resourceGroupName, crossConnectionName),
              new Func1<String, Observable<ServiceResponse<Page<ExpressRouteCrossConnectionPeeringInner>>>>() {
                  @Override
                  public Observable<ServiceResponse<Page<ExpressRouteCrossConnectionPeeringInner>>> call(String nextPageLink) {
                      return listNextSinglePageAsync(nextPageLink);
                  }
              },
              serviceCallback);
      }
docs: Gets all peerings in a specified ExpressRouteCrossConnection.
  
  @param resourceGroupName The name of the resource group.
  @param crossConnectionName The name of the ExpressRouteCrossConnection.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object