[rabbitmq-discuss] A few questions about RabbitMQ and the .NET Client

[Matthew Whitfield]

I have a few questions - and I'd be very grateful if someone could point me in the right direction as to where to read more about the answers.
 1)      Headers exchanges

a.       I can see headers exchanges mentioned on http://www.rabbitmq.com/tutorials/amqp-concepts.html but I can't find any reference to it in the .NET client (for instance, it's missing from the ExchangeType class) - even though the prototypes for ExchangeDeclare and QueueBind would seem to allow for a headers exchange to be handled. Is this just something that is 'on the list'?

b.      I can't find any documentation on exactly how header matching works. I can see it mentioned in section 3.1.3.4 of the AMQP 0.9.1 spec, but I can't see any examples. For instance, if I wanted to match on messages where the 'type' header was 'action', the 'sub-type' header contained any value and the 'source' header was 'distribution' - would that be possible?

2)      TxSelect, TxCommit and TxRollback

a.       I can't really find any good examples of the usage or implications of transactions. My use case is that I want to receive a message, then generate 100 messages which either all get routed to their queue or not (basically an atomic publish) before acking the message that I receive. This is, in part, to allow for message durability to be handled in the broker (as per the 'Not on message persistence' that is about two-thirds of the way down http://www.rabbitmq.com/tutorials/tutorial-two-python.html). I wanted to know how TxCommit would react if the broker commit failed, and for this I had to re-compile the source because the documentation doesn't say anything about it. As far as I can see a failed commit throws an UnexpectedMessageException. Is that right?

b.      While researching this, I found a recent commit which has the comment 'don't use tx in examples. The less it's mentioned the better.'. Why is that?

c.       In that commit, a message was changed to mention BasicQos instead of TxCommit - is that really the intention? Is there anywhere I can read more about that as the API documentation doesn't give much away...
Thanks very much!
Matt




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Matthew Whitfield
Software Architect


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