On Feb 17, 8:23 am, Takashi Matsuo <matsuo.taka...@gmail.com> wrote: > In my opinion, the only problem is the task for sending mail is *not* > idempotent. In other words, what if the task is executed more than > once? Presumably recipients will receive more than one mail. Its > somewhat annoying, isn't it?
true! good point. idempotence is an important, general concern, across most systems. on app engine, if it's important that you only do something once, doing it in a request handler directly isn't really any better than doing it in a task, since both could die at any point and/or run multiple times. idempotence is expensive and difficult to get right, and the specifics often change significantly from project to project, so we generally leave it to developers themselves or client-side libraries. if you need it, i actually think i've seen open source libraries for app engine that do much of the heavy lifting for you. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
