On 13/07/12 12:33, Gordon Sim wrote:
On 07/13/2012 10:34 AM, Toralf Lund wrote:
What happens if I send a message to an exchange without any queues
connected to it? Are they just thrown away? I'm assuming that they are,
and that raises another question: Is there any way I can know if a
message I just sent reached a queue, without actually checking queues
directly?
You can define an alternate exchange for the exchange in question. If
that is defined then messages which could not be routed to a queue
will be re-routed to the alternate exchange.
That allows you to subscribe and receive such unrouted messages.
Oh, I see.
Its a little clunky, but it works and fits in well with existing
clients as all they need to be able to do is subscribe and receive
messages.
We'll, at least it's better than checking or subscribing to "subscriber"
queues in the publishing application...
In theory, with AMQP 0-10, by setting the accept-mode on the transfer
you send, you can instead cause the broker to send back a
message-reject. However (a) the c++ broker does not implement this[1]
(not sure about the java broker), and (b) the clients don't in general
handle the rejects in a useful way.
Fair enough.
Thanks,
- Toralf
[1] https://issues.apache.org/jira/browse/QPID-1490
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