[jboss-dev-forums] [Design of Messaging on JBoss (Messaging/JBoss)] - Re: New package structure

[ataylor]

anonymous wrote : Being dependent on the implementation in one place (at construction) is better than being dependent on the implementation in N places (each place the class is used), so it's an improvement. 
I agree, but that is what IOC is all about, it class doesnt have to worry about how a pluggable component is constructed.

anonymous wrote : 1) Makes testing a whole lot easier since can easily create mock / fake implementions  i agree

anonymous wrote : 2) Makes code easier to read / understand 
again i agree

anonymous wrote : 3) If user wants to create their own implementation of the interface they can. If it's a concrete class they'd have to extend that class. That may not be possible or desirable.

defo.

I'm not against using interfaces where we can, just making a point. We have to make sure that we dont just introduce interfaces that are dragged out of the implementation, the abstraction still needs to make sense.

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