DRY and cross domain logic

We have a discussion in my current project group about the following:
- There are two bounded context.
- In each bounded context there is an person-alike entity, in one BC it is Client in the other it is Patient, mostly with their own business logic and methods specific to their roles.
- However, at some point Patient requires some determining logic that is implemented in Client. For simplicity let's assume both have a date-of-birth and the to-be-called logic is calculateAge().

This is not something that can be done with events, and because of DRY you do not want to implement calculateAge() twice. What is the best option to calculate the age of a patient? Client and Patient share a unique id, so Patient knows which Client to get. (N.B. I seek a conceptual solution, not one specific to the calculate age problem.)

Tom



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Posted by: Tom Eugelink <[email protected]>
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