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Design problem on consuming external libraries / services

Tue, 03/09/2010 - 14:00 — mzaj
Hello,
the following problem appears in my applications quite often and I am not sure about my solution so I would like to consult it with you.
In a nutshell I have got application which consumes two or more external components - it could be [web]service or library. I take some data from the first one and then convert it to my domain objects format - I take only data needed for performing my business operations, I don't want to pollute my domain object with external stuff. After processing I need to save output data using another service. The problem is that the second service needs all the informations that I trunk on conversion to domain objects.
To be more concrete: there is library which calculates fees and returns them in its own object format containing actual fee value and many other data completely useless for my domain model. On the other hand the web service that I am saving output in needs to receive xml which contains all data returned in object from calculations library (simply put it wants serialized form of this object).
How should I manage this? I usually create interface (eg. IFee) containing business data used in domain layer and its implementation which additionally contains all data needed by infrastructure. Domain is not coupled witch external format and when I need to get data for web service I simply cast down IFee to concrete implementation I get it.

Have you got any better solutions?

--
Best regards
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