Yes, that's what I was thinking about: retrieve multiple times until get the top 20. Not convenient enough but it is a solution.
I wonder if XEP-024 can help in this case? Making my subscriptions as a collection? On 2012-05-21, at 8:55 AM, Robin Collier wrote: > > > > To: d...@cridland.net; pubsub@xmpp.org > > From: feiya...@gmail.com > > Date: Thu, 17 May 2012 19:04:58 +0000 > > Subject: Re: [PubSub] How to retrieve events from all subscribed nodes? > > > > Thanks for your quick reply. My concern is really the timestamp. I'll have > > to retrieve all, store them somewhere than sort by timestamp. > > > > > > > > ------Original Message------ > > From: Dave Cridland > > To: Fei Yan > > To: XMPP PubSub > > Subject: Re: [PubSub] How to retrieve events from all subscribed nodes? > > Sent: May 17, 2012 1:02 PM > > > > On Thu May 17 19:55:29 2012, Fei Yan wrote: > > > Hello, > > > > > > For example in a RSS scenario I'm subscribed to 20 blogs (nodes). I > > > want to retrieve the latest 20 entries (events) from all my > > > subscribed nodes. > > > > > > I can't find out how to do that by reading XEP60. It seems only > > > allow retrieve from a single node at a time. > > > Fei Yan > > > Sent from my BlackBerry > > > > Yes, you'd need to retriev all your subscriptions from the service, > > and then iterate through that list fetching the items. > > > > There is some interest in working on a kind of "PubSub Inbox" > > metaphor, which would avoid this. > > > > Dave. > > -- > > Dave Cridland - mailto:d...@cridland.net - xmpp:d...@dave.cridland.net > > - acap://acap.dave.cridland.net/byowner/user/dwd/bookmarks/ > > - http://dave.cridland.net/ > > Infotrope Polymer - ACAP, IMAP, ESMTP, and Lemonade > > > > > > Fei Yan > > Sent from my BlackBerry > > I would simply get a sample of 20 from each subscribed node, calculate the > most recent 20, refetch more from the appropriate nodes as necessary until > you know you have the 20 most recent overall. > > This would reduce the amount of data you have to retrieve, assuming there > are a lot of items stored in your nodes. If the number of items persisted is > not > that large, then it may be simpler to simply get them all and sort it out. > > If you control the server, a better solution may be to provide a custom > plugin of > some sort that will provide you this functionality. > > Robin
