code: public Observable<Page<WorkloadItemResourceInner>> listAsync(final String vaultName, final String resourceGroupName, final String fabricName, final String containerName) {
          return listWithServiceResponseAsync(vaultName, resourceGroupName, fabricName, containerName)
              .map(new Func1<ServiceResponse<Page<WorkloadItemResourceInner>>, Page<WorkloadItemResourceInner>>() {
                  @Override
                  public Page<WorkloadItemResourceInner> call(ServiceResponse<Page<WorkloadItemResourceInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Provides a pageable list of workload item of a specific container according to the query filter and the pagination parameters.
  
  @param vaultName The name of the recovery services vault.
  @param resourceGroupName The name of the resource group where the recovery services vault is present.
  @param fabricName Fabric name associated with the container.
  @param containerName Name of the container.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;WorkloadItemResourceInner&gt; object