[rabbitmq-discuss] Regex exchange? (was: Binding to topic exchange with a negation wildcard)
curylod at asme.org
Thu Sep 13 21:27:34 BST 2012
I'm not so interested in regex, and certainly wouldn't prefer that over
performance. In my case, I have control over the names of topics, so I'm
not going to be matching any complex patterns that would see the need for a
regex. If it's easy enough to add, I'm sure there are others that could
take advantage of it.
On Thu, Sep 13, 2012 at 12:05 PM, Laing, Michael P. <
Michael.Laing at nytimes.com> wrote:
> Interesting! It's more of a "nice-to-have" option for me, much less
> important than good performance, reliable federation, etc.
> Multiple bindings and sender-selected distribution add richness as well
> that mitigate the need.
> And we have a scheme for distilling complex combinations of subscriber
> roles and topic interests into multiple pairs of symmetric 128 character
> strings which, with separating periods, create 255 char keys that are used
> for binding 'sieves' and publishing 'patterns' respectively in topic
> Seems quite fast. Actually my developers are still scratching their heads
> and not actually using it yet - but it's good to get out in front of them
> sometimes :)
> Plus there's a lot of headroom left in the scheme if we fully exploit the
> depth of each character position, so we should be able to stay out front
> for awhileŠ
> On 9/13/12 11:20 AM, "Simon MacMullen" <simon at rabbitmq.com> wrote:
> >On 13/09/12 15:53, Laing, Michael P. wrote:
> >> We would find a regular expression matching option for topic exchanges
> >> most useful.
> >> My 2 cents:)
> >Well, there's a reason AMQP didn't just specify regexs for topic
> >exchanges in the first place - it won't go anything like as fast when
> >you have a reasonable number of bindings.
> >Basically, the topic globbing in AMQP is simple enough that we don't
> >have to look at every binding for every message (and yes, this really
> >does make a huge difference!):
> >If we were to have a regex exchange, we'd have to check every binding
> >against every published message. There's no clever way to do it.
> >You might not actually care, if your RabbitMQ broker is nowhere near CPU
> >bound already. And it would be pretty easy to write. So is there general
> >interest in a regex exchange? (With the proviso that it would be notably
> >slower than the existing topic exchange...)
> >Cheers, Simon
> >Simon MacMullen
> >RabbitMQ, VMware
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