@FormParam("rows") List<Integer> rows,
@FormParam("columns") List<Integer> columns,
@FormParam("cells") List<GridCell> cells,
@FormParam("format") TypeFormatter.Format format,
@FormParam("enableLogging") Boolean enableLogging) {
ViewportDefinition viewportDefinition = ViewportDefinition.create(version, rows, columns, cells, format, enableLogging);
int viewportId = s_nextId.getAndIncrement();
String viewportIdStr = Integer.toString(viewportId);
UriBuilder viewportUriBuilder = uriInfo.getAbsolutePathBuilder().path(viewportIdStr);
String callbackId = viewportUriBuilder.build().getPath();
String structureCallbackId = viewportUriBuilder.path(AbstractViewportResource.class, "getGridStructure").build().getPath();