Retrieving specific messages from Last Value Queue

[Rajesh Khan <ra...@gmail.com>]

Hi I have a receiver in C# that is suppose to retrieve messages from a LV
Queue.
Currently I traverse through all the messages in that queue. AS follows
     while (receiver.Fetch(ref msg, timeout))
      {
*         prop = msg.Properties;*
      }
I wanted to know if there is a way to retrieve a message that has a
specific value.
For instance The sender sends the following value

 msga.SetProperty("stock-symbol", "ORCL");
 sender.Send(msga);

Is there any way that I could retrieve the ORCL message without iterating
through other messages?

Re: Retrieving specific messages from Last Value Queue

[Pavel Moravec <pm...@redhat.com>]

Hi Rajesh,
you are in fact asking for message selectors that work well in Java client but dont exist in C++ client or in broker (https://issues.apache.org/jira/browse/QPID-530). I *think* only Java / JMS client currently supports so.

The only way to workaround is to have separate queues for each stock symbol (or at least separate queue for each symbol you wish to _select_) and subscribe consumers to all such queues (plus optionally consume from the designated queue for e.g. ORCL quote).

Kind regards,
Pavel


----- Original Message -----
> From: "Rajesh Khan" <ra...@gmail.com>
> To: users@qpid.apache.org
> Sent: Wednesday, January 9, 2013 10:53:30 PM
> Subject: Retrieving specific messages from Last Value Queue
> 
> Hi I have a receiver in C# that is suppose to retrieve messages from
> a LV
> Queue.
> Currently I traverse through all the messages in that queue. AS
> follows
>      while (receiver.Fetch(ref msg, timeout))
>       {
> *         prop = msg.Properties;*
>       }
> I wanted to know if there is a way to retrieve a message that has a
> specific value.
> For instance The sender sends the following value
> 
>  msga.SetProperty("stock-symbol", "ORCL");
>  sender.Send(msga);
> 
> Is there any way that I could retrieve the ORCL message without
> iterating
> through other messages?
> 

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