Re: [Fwd: [xmlblaster] oid or xml key ?]

[Marcel Ruff <mr at marcelruff.info>]

Nelson Silva wrote:
> Hi,
>
> I've come up with this explanation so far:
>
> - The server has TopicHandlers and has a queue for each topic.
Yes, it is called history queue.
> - These topics/queues are identified by an oid
Yes, from the <key oid='...'/>
> - There are several messages in a queue.
Historical messages
> - Clients subscribe to these topics/queues with exact queries or using 
> access filters.
Yes, to the message events.
> My question now is.. can i subscribe to a single topic many times 
> using different XPath queries on the Qos and having a different 
> callback for each subscription?
If you are using java:
  SubscribeReturnQos subscribe(SubscribeKey subscribeKey, SubscribeQos 
subscribeQos, I_Callback cb)
If you use C++:
   org::xmlBlaster::client::qos::SubscribeReturnQos subscribe(const 
org::xmlBlaster::client::key::SubscribeKey& key, const 
org::xmlBlaster::client::qos::SubscribeQos& qos, I_Callback *callback=0);
Those client side methods dispatch the messages on client side to the 
given I_Callback.
For other programming languages you need to dispatch yourself.

regards
Marcel

> I'm thinking of using multiple subscribes and the XPath Qos queries 
> available in the subversion repository...
>
> Hope i'm on the rigth path .. any comment/suggestions are welcome =)
>
> Regards,
>
>    Nelson