[webbeans-dev] Replacement pattern for Manager.getInstanceByType

[David Allen]

On Tue, 2009-05-26 at 20:42 -0500, Clint Popetz wrote:
> >From what I can tell, code that used to do:
> 
>    manager.getInstanceByType(clazz) 
> 
> now need to do:
> 
> 
> manager.getReference(manager.getBeans(clazz).iterator().next(),clazz);  
> 
> (plus checking that the set contains only one element and throwing an
> exception if not.)

Yes, this is the first case I mentioned earlier that I postponed
yesterday.  This is a drastic API difference that does affect many of
the other projects too.

For the TCK, I was thinking of just adding the corresponding behavior
into the abstract test class we use so that the changes are localized to
a single line of code (each call to getInstanceByType).

Outside of the TCK, I am not sure how much it is used.  And since there
will be less of a framework involved in some cases, many instances of
the call will need to be replaced with a number of lines of code (a lot
of duplicate code as you mentioned above).

> 
> Is that really true?  Is there no more direct way to obtain this in
> the SPI?  It seems like a pretty common case.  If not, I can have a
> utility method to do the above in the core, as many things don't cast
> to ManagerImpl, so I'd rather not put it there.
> 
> -Clint
> 
> 
> -- 
> Clint Popetz
> http://42lines.net
> Scalable Web Application Development
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