Michaël Michaud wrote: > One limitation of DataStore framework, as far as I experienced it, is > that each time you zoom > or pan, needed features are loaded into memory as if they were new > features (new fid), and you > loose other features (features located out of the window) as if they had > never existed. This way, > it is not possible to process a whole featurecollection. > My vision woud be something between, with only references loaded into > memory (id and > envelope) but references for every features of the featurecollection. > With a good cache system, > it should make it possible to load much bigger datasets than with > in-memory loaders and > caching should make it possible to keep reasonable performance. > Even if it seems reasonable and feasable to me, until now, I could not > realize it (or only > versions with terrible performance drawbacks :-( ) > > Interesting. Maybe.... show us and let's see!
I don't think it would solve the billion-point problem, though, since point BBs are larger than the data. > I agree that managing large dataset in a read/write mode is quite > difficult and needs a good > framework to manage transactions (I think kosmo team did a good work > this way). > But I think read-only datasets is also an interesting usecase, and is > not as difficult to manage > as a read/write driver. > Actually the DataStore framework *is* read-only right now. > Agile (alvaro zabala) wrote a good scalable shapefile driver in the > past. I could make it work > with OJ after a minor modification, but I remember there were many > dependencies. > Hmmm... would be nice to have, but not if it means dragging in a pile of other JARs. This can't be that difficult to create more-or-less standalone, surely? -- Martin Davis Senior Technical Architect Refractions Research, Inc. (250) 383-3022 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
