I know :( I just thought there maybe be some trick with special case : Sending Mail. Good is it forces to think :)
On Jul 11, 11:57 pm, dflorey <daniel.flo...@gmail.com> wrote: > AFAIK there is no (simple) way to turn requests with undefined result > into idempotent tasks. I've been struggling to execute gdata insert > requests in a transaction as they may return with a timeout. > It would be very nice if google would provide the standard services in > an idempotent manner. > > On 10 Jul., 18:43, Marcus Brody <mhrab...@gmail.com> wrote: > > > Hello, > > > I would like to ask, if there is some way how to send mail only in > > case that some db transaction will be successful. > > I am not very experienced with gae, but I did study it now for about 2 > > weeks. > > > Desired output: > > > 1) prepare email > > 2) db transaction.begin() > > 3) do some db operation > > 4) bind sending mail with current transaction (similar to > > how can you can attach Task to queue) > > 5) db transaction.commit() > > > I am aware that I can queue mail sending task to task queue, but i > > cannot find the way how to do that mail sending task Idempotent > > without (i think) complicated locking mechanism . > > Most simple solution would be to put mail sending task to task queue, > > but this means mail could be send twice in some rare situation. (this > > is maybe not that bad but if there is some way how to avoid it, I > > would like to know) > > > Thank you, > > > Marcus > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
