component diagram clarification

[ananthakrishnan ramachandran]

Hi,

I have shown stateless session bean using proxy class to access web service in the class diagram.Can i show the proxy component in the integration tier of the component diagram?Please clarify.

[Rajan Choudhary]

Integration Tier is used for integration of components between business and EIS tiers. Your EJB call is between Presentation and Business Tiers so to me, showing your proxy in integration is an invitation to get into trouble.

[ananthakrishnan ramachandran]

Hi Rajan,
Thanks for your reply.In that case how to show the flow in the component diagram because webservice call involves external system.

[Rajan Choudhary]

My apologies. I mis-interpreted your question while doing multitasking, I thought you want to use proxy for calling the EJB from web tier. But you want to use proxy for calling web service from EJB. There is nothing wrong in your approach. You WS proxy or WSDAO can very well sit in Integration tier.

[John Lincoln]

One more way to clarify to the exam evaluator to specify WSDAO - has the proxy for making webservice call in design decisions.

So we can specify or use "DAO" for any data abstraction, not necessarily database ? right

[Rajan Choudhary]

Yes, John. That's correct as per my understanding. I used DAO for non-DB calls as well as mentioned in Cade's book.

[ananthakrishnan ramachandran]

Hi Rajan,

Thanks for your response.