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From: Apache Wiki <wikidiffs@apache.org>
To: derby-commits@db.apache.org
Date: Fri, 23 Sep 2005 17:36:20 -0000
Message-ID: <20050923173620.3018.37153@ajax.apache.org>
Subject: [Db-derby Wiki] Update of "ModuleVersioningGuidelinesReviewDjd1" by
 DavidVanCouvering

Dear Wiki user,

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The following page has been changed by DavidVanCouvering:
http://wiki.apache.org/db-derby/ModuleVersioningGuidelinesReviewDjd1

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  To answer Craig's concern, I believe you can. Strictly, you don't need the check at all, you just get a !NoSuchMethodError if you try to invoke a method that does not exist (which you could catch and ignore but I think that's ugly).
  
  ----
- '''TMNK:''' I'm not sure what module means in this context ... The word module was used in paper of derby as next. [http://db.apache.org/derby/papers/derby_arch.html#Modules] Are they, which mentioned in the paper and in this discussion, refer same existance ?
  
+ '''DVC:''' I moved Tomohito's comments as separate items in ModuleVersioningGuidelinesReview as I felt they were separate topics from the discussion of version detection and how to decide if a feature is available.
- Furthermore, what is the code to be shared as module in this discussion ? 
- If it were just java apis, they are shared already ....
  
+ ----
+ 
+ '''DVC:''' Jeremy, can you explain why internalized Strings have more meaning than ints?  In the code whether they're strings or not they'll be declared as a constant and used as such in the code.
+ 
+ So whether you have {{{public static final String FANCY_FEATURE = "FancyFeature"}}} or {{{public static final int FANCY_FEATURE = 2}}} it still looks the same in the calling code, e.g. {{{if CommonModule.implementsFeature(CommonModule.FANCY_FEATURE)}}}.  I prefer ints because then I could do a simple array and look up by index, and determine if a feature is not implemented by noticing that the index is out of range. 
+