Bob, Great, thanks a lot, it's a pure java solution and is working fine.
It's clear that if i would like to preserve other sessions trying to do the same, i should use a global object, in this case, could i use the ClickServlet or something like that ? Hans ----- "Bob Schellink" <[email protected]> escribió: > Bob Schellink wrote: > > > >> The problem is that if i open "more than one document uploading > >> window" and press submit at once, eventually a race condition arise > > >> and two documents get registered, breaking the business rule. > > > Btw it seems as if you want to use Transaction isolation to serialize > > the upload requests. If that is the case I don't think transactions is > > the ideal way to solve this. Rather synchronize on the session object: > > e.g: > > public void processDocument(File file, Context context) { > HttpSession session = context.getSession(); > > // concurrent requests will queue up here > synchronize(session) { > > validateDocument(file); > > } > } > > The above assumes validation is done by an automatic process. If it > requires human intervention or the validation process takes a long > time, you might want to think about using asynchronous requests and > dumping the documents into a Queue to be processed later. > > I'm sure there are many other ways to approach the problem as well. > > kind regards > > bob -- Hans Poo, WeLinux S.A. Oficina: 697.25.42, Celular: 09-319.93.05 Bombero Ossa # 1010, Santiago
