[Pdx-pm] meeting tonight -- DCI: A new way to OOP
Seven till Seven
enobacon at gmail.com
Thu Nov 10 14:40:36 PST 2011
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
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
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
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
As usual, the meeting will be followed by social hour at the Lucky Lab.
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