[rabbitmq-discuss] Trouble with confirms

Tom Anderson tom.anderson at timgroup.com
Tue Jul 30 16:30:06 BST 2013

On 29/07/13 17:51, Ceri Storey wrote:
> (29/07/13 17:25), Tom Anderson wrote:
>> On 29/07/13 13:40, Matthias Radestock wrote:
>>> ...
>> Aha. I didn't realise, that, thanks.
>> What i'm looking for is a way to get some sort of feedback at the 
>> sender when a message has been acknowledged by the consumer. Given 
>> that transient messages are confirmed as soon as the message has 
>> reached the queue, and persistent messages are confirmed as soon as 
>> they are written to disk, am i right in concluding that there is no 
>> way to do this with confirms? Is there any other mechanism in 
>> RabbitMQ that might let me do this?
>> My real goal here is to write a test for an application of ours, to 
>> assert that it is only acknowledging messages after it has 
>> successfully processed them, and not immediately on receipt. If 
>> anyone has any thoughts on how i might be able to do that, i would be 
>> very excited to hear them!
> For your test, I'd be very tempted to provide an adapter which 
> enforces the guarantees you want to make. Then you can have tests that:
>   * For the happy path, asserts that no more messages exist on the
>     expected (ie: that a basic.get will return no messages)
>   * For the failure path, asserts that the sent message is available
>     to other consumers once your adapter has properly failed and shut
>     down.
> Granted, the latter does assume that you can shut down the adapter 
> reasonably easily.

Apologies if i'm being thick, but what do you mean by "adapter"? Do you 
mean code that sits between the application code and the AMQP library? 
Or code that the test can use to take a grip on the application code? Or 
something else?



Tom Anderson | Developer | +44 20 7826 4312 | timgroup.com 

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