code: @Override
      public Xid[] recover(final int _flag)
      {
          if (VFSStoreResource.LOG.isDebugEnabled()) {
              VFSStoreResource.LOG.debug("recover (flag = " + _flag + ")");
          }
          return null;
      }
docs: Obtains a list of prepared transaction branches from a resource manager.
  
  @param _flag flag
  @return always <code>null</code>