code: public static I_CmsVfsServiceAsync getVfsService() {
  
          if (VFS_SERVICE == null) {
              VFS_SERVICE = GWT.create(I_CmsVfsService.class);
              String serviceUrl = CmsCoreProvider.get().link("org.opencms.gwt.CmsVfsService.gwt");
              ((ServiceDefTarget)VFS_SERVICE).setServiceEntryPoint(serviceUrl);
          }
          return VFS_SERVICE;
      }
docs: Returns the vfs service instance.<p>
  
  @return the vfs service instance