Managing Strategy objects with Hibernate & Spring

Posted by Francois on Stack Overflow See other posts from Stack Overflow or by Francois
Published on 2010-05-28T15:50:41Z Indexed on 2010/05/28 15:51 UTC
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hibernate

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spring

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strategy-pattern

This is a design question better explained with a Stack Overflow analogy:

Users can earn Badges. Users, Badges and Earned Badges are stored in the database. A Badge’s logic is run by a Badge Condition Strategy. I would prefer not to have to store Badge Condition Strategies in the database, because they are complex tree structure objects.

How do I associate a Badge stored in the database with its Badge Condition Strategy? I can only think of workaround solutions. For example: create 1 class per badge and use a SINGLE_TABLE inheritance strategy. Or get the badge from the database, and then programmatically lookup and inject the correct Badge Condition Strategy.

Thanks for suggesting a better design.

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