> a) If the dataTable is defined with its preserveDataModel set to "true", > then the data from your backend will be requested twice: > > 1) One in the RENDER PHASE by the HtmlTableRenderer as a consequence of the > execution of the HtmlTableTag doEndTag() method (obviously to be able to > 'paint' the data in the view) > 2) Another one again in the RENDER PHASE, but this time due to the > execution of the ViewTag doAfterBody() method, that in turn calls the > UIViewRoot processSaveState() method, and then the HtmlDataTable saveState() > method. More precisely, when saving the state of the dataTable, as we have > set preservedDataModel to "true", the data is again request from the backend > to be serialized and stored in the session (if server state saving) or the > client (if client state saving, gzipping and base 64 enconding it).
The second time is not necessary but it is implemented as You said. We should change this because that would make it possible (at least theoretically) that the data changed between the two calls. Regards, Mathias
