On 06/24/2011 03:05 PM, fadams wrote:
I'm a bit confused.
Surely the subject has to have been set *somewhere* by the producer, after
all I'm successfully subscribing to
"qmf.default.topic/agent.ind.event.org_apache_qpid_broker.#" so the topic
exchange would be using the subject to apply the binding.
have I missed something???
It is a little confusing. The concept of subject doesn't actually exist
in AMQP 0-10. There is the concept of a routing-key which is in many
ways like a subject, especially when using topics. However the exact
correspondence breaks down a little for queues. Hence we introduced a
qpid specific variable through which a subject could be carried in a
message.
So in your case the subscription is being mapped to a binding using a
particular binding key. Messages received over that binding will have
the routing key set, but in this case they don't have that special
subject property set.
We could in these cases (i.e. where there is no qpid.subject) fall back
to returning the routing key. That might make things less confusing (or
possibly more?!).
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