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
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