How to reduce tight coupling between two data sources

Posted by fstuijt on Programmers See other posts from Programmers or by fstuijt
Published on 2012-11-16T15:11:25Z Indexed on 2012/11/16 17:16 UTC
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architecture

I'm having some trouble finding a proper solution to the following architecture problem.

In our setting (sketched below) we have 2 data sources, where data source A is the primary source for items of type Foo. A secondary data source exists which can be used to retrieve additional information on a Foo; however this information does not always exist.

Furthermore, data source A can be used to retrieve items of type Bar. However, each Bar refers to a Foo. The difficulty here is that each Bar should refer to a Foo which, if available, also contains the information as augmented by data source B.

My question is: how to remove the tight coupling between data source A and B?

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