On Tuesday 10 November 2009 14:36:38 Jim Easterbrook wrote:
> Is it possible to subclass Backplane() in order to create a backplane
> that knows when a subscriber is added or removed?
>
> I have a CPU intensive process creating stuff that is published to a
> backplane, and I'd like to suspend processing when there aren't any
> subscribers, to minimise load on the system. My first thought was to
> subclass Backplane(), but I'm not getting anywhere with that.
>
> Is this a silly idea? Is there another way of doing it that I haven't
> discovered?
It's not a silly thought - the backplane code was written incredibly quickly,
and is really quite simple so changing it to support this would be useful.
I'll have a brief ponder. (The way to do it would be to also change the
primary data inbox to a null sink so that it can throw away data no one is
listening to without reactivating)
An overview of how the backplane works inside is described incidentally on
pages 49 - 52 of the kamaelia tutorial which can be downloaded from here:
* http://www.kamaelia.org/PragmaticConcurrency
(Incidentally, if you'd like a paper version, I can send you a copy in the the
internal mail :)
Michael.
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