Hmm. Good thinking Andrew. I've done a bit more digging along those lines..I don't think Jaiku has publically said if and what messaging protocols they might use, but there seems to be some speculation that it uses XMPP.
That might also neatly align with their comment that they are in some cases "extending" GAE in their port..and the recent news that XMPP is scheduled to come to GAE at some point in the next 6 months. Perhaps it's the work on the Jaiku port that's bringing that functionality... I didn't know anything about messaging protocols or XMPP until I dug around after your post, so it's all new to me. I found a project purporting to provide XMPP functionality in advance of Google's official support, at http://imified-demo.appspot.com/, but looking at the code for it, I cannot for the life of me see how this could be used to address the problems discussed in my original email. That project seems only to take instant messages via a POST to a URL and save them to the datastore..but there doesn't seem to be any of the 'instant distribution' of updates to people subscribed to your presence etc. that other XMPP software boast about. Using that xmpp project linked, there doesn't seem to be anything there about pushing updates to subscribed users etc. I dug around the app gallery for other open source apps along similar lines..there are some would-be twitter/jaiku clones..all I've seen use non-messaging approaches, but they all make one compromise or another similar to solutions I'd come up with myself (e.g. taking the last 5 updates from friends and sorting them yourself in memory by date..which has its own issues, for example, if one user had made >5 updates recently..+ you'd inevitably hit a roadblock on all these reads beyond a certain number of friends..there's only so many friends you could do this for before it gets too slow). Any thoughts/ideas...? On Mar 11, 1:54 pm, Andrew Badera <and...@badera.us> wrote: > you'd have to wonder if there's a push out to Gnip somewhere ... or if > protocol buffers are involved .. > > Thanks- > - Andy Badera > - and...@badera.us > - (518) 641-1280 > - Tech Valley Code Camp 2009.1:http://www.techvalleycodecamp.com/ > - Google me:http://www.google.com/search?q=andrew+badera > > On Wed, Mar 11, 2009 at 9:21 AM, peterk <peter.ke...@gmail.com> wrote: > > > I just read on your blog (from January) the intention to release the > > appengine port of Jaiku as open source when the port is finished..but > > I was wondering if I could be so cheeky as to jump ahead with a couple > > of questions about it. The requirements of Jaiku seem to line up > > roughly similarly with issues I'm having in a slightly different > > context, that I'm finding pretty challenging to implement efficiently > > on app engine. > > > With your service, you seem to track updates for friends and other > > people I follow..so I might have a long list of people I'm following, > > and you feed me their updates. > > > How do you implement this on GAE? > > > I've been toying with a very similar problem for some time now. It > > seems to me you cannot chain together queries such as > > me.friends.updates.order(..) to get your friends' latest updates, for > > example. You can't make n writes to n update queues for n people > > following you, since writes are so costly. If I store my friends in a > > list of keys, this limits the number of friends I can query at a given > > time to 30. e.g. updates.all().filter('user IN', me.friends) is > > limited to 30 subqueries. I may have many more friends, so this > > approach doesn't seem to be sufficient. > > > I've been scratching my head over a similar problem for some time now, > > coming up with various hairbrained schemes that have been overly- > > complex, none of which deliver scalability to the nth degree. So I'd > > really, really, really appreciate any insight you could provide in > > implementing this kind of data model on GAE!! Many 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 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 -~----------~----~----~----~------~----~------~--~---
