Re: [cosmos-dev] Some questions on COSMOS framework..Pls help

[Saurabh Dravid <sadravid@xxxxxxxxxx>]

Hi Mano,

Thanks for your questions.

If you download COSMOS Demo and Runtimes
package, you will find that we provide AperiMDR as an example of MDR. We
execute some SQL queries on provided Aperi database in that example.

You can find the instructions on setting
up AperiMDR in COSMOS Installation Guide (please refer Installing and
Running the COSMOS Demo and Prerequisites)

thanks

With best regards,

Saurabh Dravid,
Staff Software Engineer - Autonomic Computing,
India Software Lab, IBM Software Group
4205 S MIAMI BLVD, DURHAM NC 27703-9141
D148/B500
Phone: +919-254-8783, e-mail: sadravid@xxxxxxxxxx
About India Software Lab

cosmos-dev-bounces@xxxxxxxxxxx wrote on 11/20/2008
02:50:23 PM:

> [image removed] 
> 
> [cosmos-dev] Some questions on COSMOS framework..Pls help
> 
> Mano S 
> 
> to:
> 
> cosmos-dev
> 
> 11/20/2008 02:50 PM
> 
> Sent by:
> 
> cosmos-dev-bounces@xxxxxxxxxxx
> 
> Please respond to writetomano, Cosmos Dev
> 
> Hi,
> 
> We're trying to adopt COSMOS for one of our projects that's trying
> to federate heterogeneous data sources. I'm pretty new to COSMOS and
> was doing a little ground work analysis to study the capabilities
of
> the framework to start with. I debugged the StudentTeacherSample 
> that comes with the cosmos-demo and following are my inferences.
> 
> Could some one kindly review my understanding and correct me if I'm
> wrong somewhere?
> 
> 1. COSMOS provides a data federation framework with classes and 
> interfaces that can parse through the CMDBf query requests & only
> "orchestrates" the query execution by calling appropriate
query 
> handlers, but DOES NOT transform the CMDBf query into a SQL and 
> execute it against the physical data source.
> 
> 2. COSMOS provides features that generate the query handler factory
> and the actual handlers have to be implemented by the developer.
> 
> 3. CMDBf query doesn't query against the physical source but the MDR
> has to be a data provider (but how?) and the Query framework in 
> COSMOS as part of the execution, will provide the handle (Context
& 
> Constraint) to the handlers and the actual query join / filtering
is
> to be "handcoded" inside the handlers.
> 
> For instance, in the StudentTeacher example, the data provider being
> an XML, the parsed XML is filled into a data provider object 
> (XMLRepository) and the query handlers execute the CMDBf query 
> against this data provider. How does this work for an RDBMS table?
> 
> 4. Is there a GUI support (either in WebUI or through any other 
> plugin) to model the relationships between two entities?
> 
> I would be very thankful if someone can clarify these doubts of mine.
> 
> Thanks
> Mano

> 
> 
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