[Pdx-pm] [Follow-Up] DCI: A new way to OOP

Chad Granum exodist7 at gmail.com
Thu Nov 10 22:34:45 PST 2011

Since there seemed to be interested I figured I would send this out:

DCI IRC channel: $dci on irc.perl.org
My Slides: exodist.github.com/DCI
Github project: github.com/exodist/DCI

On Thu, Nov 10, 2011 at 2:40 PM, Seven till Seven <enobacon at gmail.com> wrote:
>  Thu. November 10th, 6:53pm at FreeGeek – 1731 SE 10th Ave.
> DCI: A new way to OOP.
>  speaker: Chad 'Exodist' Granum
> The DCI concept was created by Trygve Reenskaug, (inventor of MVC) and
> James Coplien.
>  DCI Stands for Data, Context, Interactions. It was created to solve the
> problem of unpredictable emergent behavior in networks of interacting
> objects. This problem shows itself in complex OOP projects, most
> commonly in projects with deep polymorphism. This is a problem that
> Procedural/Imperative Programming does not have.
>  DCI does not replace OOP, instead it augments it with lessons learned
> from looking back at Procedural Programming. It defines a way to
> encapsulate use cases into a single place. This provides an advantage
> to the programmer by reducing the number of interactions that need to
> be tracked. Another advantage is the reduction of side-effects between
> contexts.
>  Another way to look at it is that a DCI implementation is much more
> maintainable as a project matures. Changes to requirements and
> additional features cause clean OOP project to degrade into spaghetti.
> DCI on the other hand maintains code clarity under changing
> requirements.
> You will Learn:
>  * How to think in DCI
>  * How the DCI cpan package helps you write DCI
>  * That you may already write things in a form of DCI
>  * How a DCI implementation compares to an OOP implementation (in a
> generic task)
>  As usual, the meeting will be followed by social hour at the Lucky Lab.
> --
>        http://pdx.pm.org
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