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Posted to users@qpid.apache.org by Toralf Lund <to...@pgs.com> on 2012/07/13 11:34:29 UTC
Messages to exchange without queues connected?
Hi,
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?
- Toralf
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Re: Messages to exchange without queues connected?
Posted by Toralf Lund <to...@pgs.com>.
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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Re: Messages to exchange without queues connected?
Posted by Gordon Sim <gs...@redhat.com>.
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. 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.
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.
[1] https://issues.apache.org/jira/browse/QPID-1490
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