[rabbitmq-discuss] asynchronous fetching messages from rabbitMQ queues

Wed Nov 9 05:50:10 GMT 2011

Hello Matthew,

Calling BaiscQos on my channel helped me prefetch(say 100 messages) as
required.

But, when I call "consumer.Queue.Dequeue()" I get only 1 message. Do I have
to call Dequeue 100 times to fetch 100 messages? Cant I do it with one call
??

Matthew Sackman-3 wrote:
> 
> On Mon, Oct 24, 2011 at 04:51:35AM -0700, pavuuu wrote:
>> Is it possible to fetch messages asynchronously from rabbitMQ queues ?
> 
> Yes. Basic.consume will deliver msgs asynchronously to the client.
> 
>> Colz when I do two consecutive BasicConsume's on any particular queue, I
>> get
>> the same message twice.
> 
> Please provide code that demonstrates this - this should not happen.
> Multiple basic.consumes on the _same_ queue will make the queue deliver
> each message to one consumer (in the absence of requeuings).
> 
>> If I have to fetch the first two messages, I have to do
>> 
>> BasicConsume -- BasicAck -- BasicConsume -- BasicAck
> 
> No.
> 
> BasicConsume -> BasicDeliver -> BasicAck -> BasicDeliver -> BasicAck ...
> 
>> Also, will the client library supports fetching, say top 100, messages of
>> any particular queue. ?
> 
> Yes, you want want to use basic.qos and set the msg prefetch count to
> 100.
> 
> Matthew
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> 
> 

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