domínio: dividir e conquistar

R E S O U R C E O R I E N T E D A R C H I T E C T U R E

R E S O U R C E O R I E N T E D A R C H I T E C T U R E

D I V I D I R E C O N Q U I S TA RDOMÍN IO

Q U E M S O U E U ?

•Programador

•Glio

•@nelson_senna

D I S C L A I M E R

S O B R E A I M A G E M

Esse é o coliseu romano e, é uma referência à estratégia do imperador Júlio César.

– J Ú L I O C É S A R

“Divide et vinces”

D O M Í N I O É S O B R E C O M U N I C A Ç Ã O

– M . E . C O N W AY

“Organizations which design systems are constrained to produce systems which are copies of the communication structures of

these organizations.”

P R O B L E M A S D E C O M U N I C A Ç Ã O , D E S A L I N H A M E N T O S D E O B J E T I V O S E

C O N C E I T O S N Ã O S Ã O S A U D ÁV E I S

– M I C H A E L F E AT H E R S

“Misalignments between business knowledge and development knowledge persist in the code. We work around them and, more often than not, end up building on top of them rather than fixing them.”

– B R I A N F O O T E A N D J O S E P H Y O D E R

“Domain experience is an essential ingredient in any framework design

effort… Without knowing the architectural demands of the domain, such an attempt

is premature, if not foolhardy…”

O Q U E É D O M Í N I O ?

U M P R O B L E M A Q U E S E R Á R E S O LV I D O U S A N D O U M S O F T W A R E

– VA U G H N V E R N O N

“When you develop software for an organization, you’re working in its

Domain. It should be pretty obvious to you what your Domain is. Your work in

it.”

O U S E J A …

P R I M E I R A D I V I S Ã O :

D O M Í N I O = C O R E D O M A I N + S U B D O M A I N S

C O R E D O M A I N

1. Por que escrever esse software vale a pena?

2. Por que não comprar uma solução pronta?

3. Por que não contratar alguém para construir esse software pra você?

É O C O N C E I T O F U N D A M E N TA L P O R T R Á S D O N E G Ó C I O

– VA U G H N V E R N O N

“It’s a nontrivial problem to solve, and succeeding would help the company

establish a new competitive advantage.”

– E R I C E VA N S

“...the Core domain should deliver about 20% of the total value of the entire

system, be about 5% of the code base, and take about 80% of the effort.”

S U B D O M A I N S

PA R T E S D O S I S T E M A , Q U E A P E S A R D E S E R E M E S S E N C I A I S PA R A O N E G Ó C I O , N Ã O FA Z E M

PA R T E D O C O R E D O M A I N

S E G U N D A D I V I S Ã O :

S U B D O M A I N S = G E N E R I C + S U P P O R T I N G

G E N E R I C S U B D O M A I N S

P R O B L E M A S Q U E P O S S U E M U M A L I T E R AT U R A E X T E N S A , B E M E S TA B E L E C I D O S E E S TÁV E I S . N Ã O

N E C E S S A R I A M E N T E L I G A D O S A O N E G Ó C I O .

M Ó D U L O D E R E C O M E N D A Ç Ã O D E P R O D U T O S

S U P P O R T I N G S U B D O M A I N S

D I F E R E N T E D O S S U B D O M Í N I O S G E N É R I C O S , O S S U B D O M Í N I O S D E S U P O R T E G A R A N T E M Q U E F U N C I O N A L I D A D E S E S S E N C I A I S

P R O N E G Ó C I O E S T E J A M D I S P O N Í V E I S .

M Ó D U L O D E PA G A M E N T O N U M E - C O M M E R C E

R E G I S T R A N D O N O S S A C O N Q U I S TA

Domínio

Entrega

Catálogo

Pagamento

Recomendação

Domínio

Entrega

Catálogo

Pagamento

Recomendação

Supporting

Generic

Supporting

Core

R E F L E X Õ E S D A C O N Q U I S TA

U S E O D O M Í N I O C O M O P O N T E PA R A S E C O M U N I C A R

C O N H E C E R S E U D O M Í N I O E V I TA E R R O S A R Q U I T E T U R A I S G R AV E S N A C O N C E P Ç Ã O D O

S O F T W A R E

U M S O F T W A R E M E L H O R O R G A N I Z A D O E C O M “ B A R R E I R A S ” E R E S P O N S A B I L I D A D E S B E M

D E F I N I D A S

P O S S I B I L I TA O A L I N H A M E N T O D E O B J E T I V O S E N T R E A S Á R E A S D A E M P R E S A

U M S O F T W A R E B A S E A D O N U M D O M Í N I O R E S P O N D E R Á P I D O A M U D A N Ç A S

– E R I C E VA N S

“...if programmers are not interested in the domain, they learn only what the application

should do, not the principles behind it. Useful software can be built that way, but the

project will never arrive at a point where powerful new features unfold as corollaries

to older features.”

AV E , D O M Í N I O !

D Ú V I D A S ?

A G R A D E C I M E N T O S

• Augusto Pascutti (@augustohp)

• Eriksen Costa (@eriksencosta)

• Ivo Nascimento (@iannsp)

• Luís Cobucci (@lcobucci)

O B R I G A D O !

F O T O S

• https://flic.kr/p/r5VdWE - Green field

• https://flic.kr/p/pfiFkX - Bridging the gap

• https://flic.kr/p/5V6RA2 - Collaboration

• https://flic.kr/p/vqdF4d - Cornerstone

• https://flic.kr/p/ppsKuz - Library

• https://flic.kr/p/kbSRnu - Big ball of mud

R E F E R Ê N C I A S•http://www.laputan.org/mud/

•http://www.jefclaes.be/2014/02/strategic-ddd-in-nutshell.html

•https://blog.8thlight.com/uncle-bob/2012/08/13/the-clean-architecture.html

•http://c2.com/cgi/wiki?ConwaysLaw

•http://www.r7krecon.com/#!provocation/gfqa5

•http://www.r7krecon.com/#!implications/t2tbw

•http://gorodinski.com/blog/2013/04/29/sub-domains-and-bounded-contexts-in-domain-driven-design-ddd/

•http://blog.jonathanoliver.com/ddd-strategic-design-core-supporting-and-generic-subdomains

•Domain-Driven Design: Tackling Complexity in the Heart of Software - Eric Evans

• Implementing Domain-Driven Design - Vaughn Vernon