code: private Iterator<String> getSpaceListing(final StorageProvider store,
                                               final String spaceId)
          throws TaskExecutionFailedException {
          try {
              return new Retrier().execute(new Retriable() {
                  @Override
                  public Iterator<String> retry() throws Exception {
                      // The actual method being executed
                      return store.getSpaceContents(spaceId, null);
                  }
              });
          } catch (Exception e) {
              String msg = "Error attempting to retrieve space listing: " +
                           e.getMessage();
              throw new DuplicationTaskExecutionFailedException(
                  buildFailureMessage(msg), e);
          }
      }
docs: Retrieve the content listing for a space
  
  @param store   the storage provider in which the space exists
  @param spaceId space from which to retrieve listing
  @return