[rabbitmq-discuss] how to consume one message at a time

Tue Nov 17 03:42:59 GMT 2009

Thanks Scott. But I do want to subscribe/consume (I think), as it is unknown whether there will be any data in the queue, and I want to be notified immediately when there is. I don't really want to poll rabbit using a basic.get and would rather be notified asynchronously when new items are in the queue. I have hundreds (thousands soon) of queues waiting for data across a cluster and the polling overhead would be higher than I want it to be. 

-JD 

----- Original Message ----- 
From: "Scott Brooks" <scott.brooks at epicadvertising.com> 
To: "JD Conley" <jdc at hive7.com> 
Cc: rabbitmq-discuss at lists.rabbitmq.com 
Sent: Monday, November 16, 2009 6:59:35 PM GMT -08:00 US/Canada Pacific 
Subject: Re: [rabbitmq-discuss] how to consume one message at a time 

I'm not sure what the .NET api looks like, but you want to do a basic get, rather then a basic subscribe. 

It will return a single message from the queue, and then when you call it again, you will get the next message(or null/something similar) 

Scott 

On 2009-11-16, at 5:41 PM, JD Conley wrote: 

> I'm using the .NET client and can't figure out how to consume only one 
> message at a time. Basically I would like to simply: 
> 
> 1. Consume one message from a queue 
> 2. Cancel consumption so I don't lose any messages 
> 
> My confusion comes with the statement in the user guide that "Application 
> callback handlers must not invoke blocking AMQP operations (such as 
> IModel.QueueDeclare or IModel.BasicCancel). If they do, the channel will 
> deadlock." But, a BasicCancel is precisely what I want to do in the 
> callback. 
> 
> I want to use the EventingBasicConsumer. What would be the best way to 
> accomplish this? Which options do I set? 
> 
> -JD 
> 
> 
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