Hi Salman, It seems like there would be quite a few ways to detecting when a user is not longer active in the application and deciding how long without an incoming request is "too long" would be up to you.
When you receive an incoming HTTP request in your app, you can check the current user using the Google accounts API. One suggestion for keeping the user list fresh could be to have an Ajax request periodically hit the server, when the user closes the tab/window, the requests would stop flowing in. Just an idea, you could do this many other ways. To filter on certain properties of your users, you'll need to have entities in the datastore with this additional information and associate them with a user. I'm not sure how much you've used App Engine before, but if you are completely new to App Engine, the getting started guide's guestbook example would be a good place to start. Happy coding, Jeff On Fri, Apr 10, 2009 at 7:13 AM, slmnhq <salman....@gmail.com> wrote: > > Hi, > > I am trying to build a community website which has a very familiar > pattern: > - it displays the list of all users that are currently logged-in > - it allows each user to filter the above list by some criteria (eg: > geo-location, age, etc). > > I've never done this before, so I was hoping somebody could point me > to articles that talk about the ins-and-outs of these features. Also, > I want to understand how the DB and Memcache will factor into this. > > One issue that is completely stumping me is when a user may be logged > in, but has been inactive for a long enough period of time that he/she > is effectively logged-out and should be removed from the list. > > I will appreciate any ideas. > > Thanks, > Salman > > > > > > --~--~---------~--~----~------------~-------~--~----~ 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-appengine@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 -~----------~----~----~----~------~----~------~--~---
