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Posted to users@qpid.apache.org by "Hamid.Shahid" <ha...@hotmail.com> on 2012/08/27 17:09:13 UTC
Is possible to start reading a message queue from a specific
message number
Hi,
I am trying to read a message queue in the 'browse' mode, using following
connection properties;
{ node: { type: queue }, create: never, assert: never, mode: browse }
Everytime, I read the queue it starts from the message#1 to message#n, since
it is in browsing mode.
Is it possible that I can start reading the queue in browing mode but from a
specific message# ?
For example: The first time I read the queue, I want to start from the
begining but the next time I want to start from a specific message number.
Please let me know, if it is possible, while using the browsing mode.
Thank you.
regards,
Hamid Shahid
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Re: Is possible to start reading a message queue from a specific
message number
Posted by Gordon Sim <gs...@redhat.com>.
On 09/04/2012 01:36 PM, Hamid.Shahid wrote:
> Yes, I am using JMS. Can you please describe more about the selectors? and
> How can they be used?
Any decent JMS tutorial or book will include a description of selectors,
e.g. http://docs.oracle.com/javaee/6/tutorial/doc/bnceh.html#bncer.
> Moreover, How can I subscribe to a queue existing on the Qpid server, by
> creating a topic on the client end?
I'm sorry but the question doesn't make sense to me, so I'm not sure how
to answer.
I'd recommend reading
http://qpid.apache.org/books/0.18/Programming-In-Apache-Qpid/html/
however as well as a good introduction to JMS.
In JMS you have two types of 'Destination' from which you can receive
messages: Queues and Topics. (Basically corresponding to point-to-point
and pub-sub patterns respectively if that terminology is more familiar).
Qith the Qpid JMS client, you configure the Destinations using an
address syntax described in the programming guide above. In its simplest
form that can be the name of a queue or an 'exchange' (which is the AMQP
concept used to model JMS Topics). These can be created on the server
with administrative tools. However the address syntax support more
advanced options for cases where on demand creation is needed.
For a topic subscription, the Qpid client will create a 'subscription
queue' and 'bind' that to the exchange used for the topic. It will then
subscribe to that subscription queue. However this is all done by the
library for you. All you need to do is define the name of the topic (and
optionally decide if it should do any filtering).
Hope this helps. As I say the question wasn't really clear to me, so if
it didn't please feel free to ask again :-)
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Re: Is possible to start reading a message queue from a specific
message number
Posted by "Hamid.Shahid" <ha...@hotmail.com>.
Hi Gordon,
Thank you for your suggestions.
Yes, I am using JMS. Can you please describe more about the selectors? and
How can they be used?
Moreover, How can I subscribe to a queue existing on the Qpid server, by
creating a topic on the client end?
- Hamid
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Re: Is possible to start reading a message queue from a specific
message number
Posted by Gordon Sim <gs...@redhat.com>.
On 08/27/2012 04:09 PM, Hamid.Shahid wrote:
>
> Hi,
>
> I am trying to read a message queue in the 'browse' mode, using following
> connection properties;
>
> { node: { type: queue }, create: never, assert: never, mode: browse }
>
> Everytime, I read the queue it starts from the message#1 to message#n, since
> it is in browsing mode.
>
> Is it possible that I can start reading the queue in browing mode but from a
> specific message# ?
There is nothing that directly does that. You could emulate something
similar with selectors (you are using JMS, right?).
An alternative would be to use a durable topic subscription instead of
browsing the queue. Whether that is any use will depend on the bigger
picture in your system.
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