DDDをめぐる話題（James Coplien, Eric Evans ほか、2016年1月DDD Europe の前に）

Eric Evans @ericevans0

A lot of #dddesign going on in Europe these days. twitter.com/mathiasverraes…

Mathias Verraes @mathiasverraes

Got new Domain-Driven Design workshops coming up in Ossa (Poland), Amsterdam, Brussels, Leuven, Berlin verraes.net/workshops/ #DDDesign

2015-09-11 00:38:12

James Coplien @jcoplien

Start the year off right. twitter.com/ddd_eu/status/…

DDD Europe @ddd_eu

"Building DCI Systems on a DDD Foundation" full day pre-conference workshop with @jcoplien on Jan 27 ow.ly/RJzci

2015-09-15 17:02:22

James Coplien @jcoplien

@ericevans0 @mathiasverraes Or at least a lot of stuff called #DDDesign...

Eric Evans @ericevans0

@jcoplien @mathiasverraes Yeah.:)

James Coplien @jcoplien

@ericevans0 @mathiasverraes So, in one Tweet, what is DDD? That is, what's the unifying underlying principle?

Mathias Verraes @mathiasverraes

@jcoplien @ericevans0 How about DCI-in-a-tweet?

James Coplien @jcoplien

@DTraub @ericevans0 Indistingiishable from OO, rule-based programming, or <fill-in-the-blank>

James Coplien @jcoplien

@mathiasverraes @ericevans0 Easy. Structuring software after operational models people carry in their head to solve problems, using objects.

Jef Cλaes @JefClaes

@jcoplien @mathiasverraes @ericevans0 Do you think objects are a good fit for each model?

Eric Evans @ericevans0

@JefClaes @jcoplien @mathiasverraes Objects are versatile, but It's been ages since I've heard anyone claim they're good for everything.

Eric Evans @ericevans0

@jcoplien @DTraub I think an explanation of #DDDesign reduced to 140 characters is going to be incomplete to the point of being misleading.

James Coplien @jcoplien

@ericevans0 @pwyczes @mathiasverraes Is it just a collection of disembodied "good things?" I'm looking for the insight or unifying principle

James Coplien @jcoplien

@ericevans0 @JefClaes @mathiasverraes Here, I define object in the sense that Kay used it, in the tradition of cognitive modeling.

James Coplien @jcoplien

@ericevans0 @JefClaes @mathiasverraes Hey — I'm the multi paradigm guy and would never mislead people into thinking objects are a panacea.

James Coplien @jcoplien

@ericevans0 @mathiasverraes I asked is if you could explain the underlying principle in 140 characters. If not, I suspect it's an amalgam.

James Coplien @jcoplien

@ericevans0 @mathiasverraes Is there *anything* that was considered good design practice at the time of the book that is outside DDD?

James Coplien @jcoplien

@egonelbre @ericevans0 @mathiasverraes That's been the holy grail of just about every design method. You find it in SASD, in OO...

James Coplien @jcoplien

@ericevans0 @nkoder @pwyczes @mathiasverraes Or philosophy? Or world model?

Eric Evans @ericevans0

@jcoplien @mathiasverraes Yes, lots of stuff! For one thing, in #dddesign I advocated using just one model for analysis, design, etc.

Eric Evans @ericevans0

@jcoplien @mathiasverraes The emphasis on multiple specialized models, was in contrast to enterprise modeling and also defacto norms.

Eric Evans @ericevans0

@jcoplien @mathiasverraes It might well be an amalgam. I don't see that as a problem if the whole is more than the sum of the parts.

Eric Evans @ericevans0

@jcoplien @pwyczes @mathiasverraes Starting from this framing, I think it is hard to get anywhere good.

Eric Evans @ericevans0

@jcoplien @pwyczes @mathiasverraes constrained to less than sound bites (140 char), we try to squeeze a 'good thing' and lose the whole.

Eric Evans @ericevans0

@jcoplien @mathiasverraes I've thought about trying to explain DDD in a series of tweets. Not a formal definition, but the gist.

Eric Evans @ericevans0

@jcoplien @JefClaes @mathiasverraes Agreed