[jboss-dev-forums] [Design the new POJO MicroContainer] - Re: WiredMicrocontainerTest

[adrian@jboss.org]

"alesj" wrote : "adrian at jboss.org" wrote : 
  |   | I already went through and fixed this once and combined three or four classes you'd created in the package back into the main test class. :-)
  |   | There's a previous thread about it somewhere?
  |   | 
  | You call it 'N<->M problem', I call it OO approach. :-)
  | 

No. If it is OO you ask the question, isA (inheritance) or hasA (encapsulation)

In this case it isn't very clear, you can make arguments for either.

My test isA wired test
My test hasA wired controller registration

In general, if it is not clear, use hasA because it avoid the N<->M problem
(absent multiple inheritance :-) and enables greater reuse.

NOTE: Many people would argue that setters are not a correct use of encapsulation
(I just call it externalising the policy ;-). 

But you can just make it a protected setter if you think it really breaks encapsulation
and you want policy controlled by subclasses (that ways its really no different from
constructor parameters except you don't have to create 5,000 constructors 
for all the different policy parameters and their permutations. :-)

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