I think that you should look at PubSubHubbub. Seems to be GAE's official approach to feeds and events. There was a presentation at this year's Google I/O conference on a different solution called Channel API but it hasn't been released. I just wish they had a service API for either one on the Java sdk.
On Jul 23, 3:44 pm, Mark <[email protected]> wrote: > Hi, > > I'm looking to implement a pub/sub mechanism for my web app, similar > to twitter. Users can follow one another. When a user performs some > action, I'd like their followers to be able to see those actions in > their follower stream. > > I can't figure a good way to do this on app engine. The most naive > implementation would be to write a record per follower when an action > is performed, like: > > public void userAction(String username, String actionDescription) { > List<Follower> followers = getAllFriends(username); > for (Follower it : followers) { > Action action = new Action(it.getUsername(), > actionDescription); > pm.makePersistent(action); > } > } > > then next time a user logs onto the site, they could simply query all > actions (in pages) that have been prepared for them. > > This would work horribly though as it would require lots of writes as > users get more followers. Is there an optimized way to do this on app > engine? I don't need a method that works in realtime, accuracy is not > that important either, meaning I could live with a 'sprinkling' of > action records. > > I'm looking at the pub/sub topics in the dev forum and property lists > are coming up a lot - is this a pattern to look into for this type of > application (not familiar with property lists)? > > Thanks -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
