[rabbitmq-discuss] Message Aggregating Queue

[Alexis Richardson]

On Thu, Apr 28, 2011 at 4:42 PM, Tim Fox <tim at rabbitmq.com> wrote:
>
> Going further, I think it makes sense to allow things other than queues to
> be bound into exchanges.

+1


> The only thing that really matters is the thing that's bound into the
> exchange can accept a message. What it does with the message afterwards
> (queues it, puts it in a map, or whatever) the exchange doesn't need to know
> about.
>
> FWIW, this was actually at the core of the design of HornetQ when I was
> doing that. In some ways the HQ model is similar to AMQP 0.8/0.9.x, there is
> a concept of an postoffice (which is similar to an exchange), then things
> called "bindings" are bound into the exchange using a specific key (binding
> key). Binding is just an interface which accepts a message (or not).
>
> Concrete binding types are Queue (which is like an AMQP queue only more a
> bit more sophisticated - (it supports message selectors, priorities etc),
> LVQ, and Divert - this takes a message and re-routes back through the
> postoffice under a different routing key, it can also copy a message and
> "siphon" it off elsewhere. You can also create your own and add them to the
> postoffice.
>
> Anyway, the point is you can do some really sophisticated things when you
> combine exchanges and "things that accept messages" rather than just
> exchanges and queues.
>
> More generally, AMQP in some sense wants to be a model of a
> named-soup-of-objects-in-the-broker (hence AMQP 1.0's approach, as I
> understand it), so from this point of view having named classes (fanout
> exchange, direct exchange, queue-backed-by-rabbit, queue-backed-by-riak,
> etc) and as generic a factory/constructor method as possible (in 0-9-1
> unavoidably split into at least exchange.declare and queue.declare) makes a
> fair bit of sense.
>
> Regards,
>   Tony
>
>
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