[vwnc] DCI: a very interesting OO paradigm; and a very nice characterization of Smalltalk

Dear all,

Smalltalk demonstrates once more its innovative: Trygve Reenskaug, the inventor of Model-View-Controller, has come up with some very interesting new thoughts. Very Smalltalk-ish and realized in Squeak. Read this: http://heim.ifi.uio.no/~trygver/2008/commonsense.pdf

In the Appendix he also gives a, IMO very good, definition of Smalltalk:

Smalltalk A powerful information system, one in which the user can store,
access and manipulate information so that the system can grow as the
user’s ideas grow. The programs are constitute an important part of
this information.

Tell your (Smalltalk-, Java-, C++#-, Ruby- ...) friends!

Cheers
Helge

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Helge K. Nowak
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Dear *,

then please also read the draft of Jim Coplien's new book:
http://sites.google.com/a/gertrudandcope.com/info/Publications/LeanArchitecture.pdf

Cope is speaking at OOP in Munich if you want to hear about DCI.

For Smalltalkers there are a couple of take-aways: Cope says MVC needs an update, it lacks the possibility to express algorithms. That's what he calls DCI. Role-based modeling and traits as a language feature help to overcome this. In C++ you could do all this 10 years ago with template metaprogramming (which I never understood ;-) ). In Smalltalk can do that, for the JVM there is Scala with traits support. Plain Java is more painful.

Cope has quite non-mainstream views on test-driven and refactoring.

Frank.


Nowak, Helge schrieb:

Dear all,

Smalltalk demonstrates once more its innovative: Trygve Reenskaug, the inventor of Model-View-Controller, has come up with some very interesting new thoughts. Very Smalltalk-ish and realized in Squeak. Read this: http://heim.ifi.uio.no/~trygver/2008/commonsense.pdf

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