[standards-jig] JEP-0024: Publish/Subscribe - Topic based messaging

DJ Adams dj.adams at pobox.com
Sat May 11 15:20:16 UTC 2002


On Wed, Apr 24, 2002 at 02:40:33PM -0700, Iain Shigeoka wrote:
> > 3.  On subscription to a topic it would be convenient to elect to receive
> >   the last message that was published on that topic, if one is available.
> 
> Interesting.  From an efficiency standpoint, this could place a big burden on
> the server though.  You'd never be sure when a message is done and can be
> discarded from a queue because someone can always come along and request the
> last x messages.

I may have read what Dave wrote differently. To me, storing _only_ the
last published payload for each publisher/subject is a burden, but not
a big one, as there's no concept of queue lengths or 'last x messages',
just 'last message (if any)'. 

Or did I miss something?

dj



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