1.
Domain Driven Design
Zero to Hero
Fabrício Rissetto

2.
fabriciorissetto.com
fabriciorissetto
fabriciorissetto
fabriciorissetto@gmail.com

3.
Schedule
● Basic Concepts
● Ubiquitous Language
● Domain Expert
● Domain Model
● Architectures types
○ DDD,
○ Smart UI,
○ …
● Strategic Design
○ Bounded Context
○ Context Maps
○ Domain Events
○ Event Storming
● Tactical Design (building
blocks)
○ Layered Architecture
○ Entities
○ Value Objects
○ Aggregates
○ Domain Services
○ Factories
○ Repositories
● CQRS
● SOA
○ Event Driven Architecture
● Event Sourcing
● Final Thoughts

4.
Domain Expert

5.
Ubiquitous Language

6.
Domain == problem
Model == solution
Distilled knowledge​
“The model isn’t just the knowledge in a domain expert's head; it is
a rigorously organized and selective abstraction of that.”
- Eric Evans
Can be expressed in several ways:​
● Code
● Diagrams
● Written Documentation
What is a Domain Model?

7.
Ubiquitous Language

8.
C#

9.
C#

10.
C#

11.
C#

12.
Ruby

13.
Before we start
● An iterative process
● Business involvement (domain experts)
● Being fluent with Object-Oriented (OO) programming paradigm
● Being familiar with SOLID principles

14.
Schedule
● Basic Concepts
● Ubiquitous Language
● Domain Expert
● Domain Model
● Architectures types
○ DDD,
○ Smart UI,
○ ...
● Strategic Design
○ Bounded Context
○ Context Maps
○ Domain Events
○ Event Storming
● Tactical Design (building
blocks)
○ Layered Architecture
○ Entities
○ Value Objects
○ Aggregates
○ Domain Services
○ Factories
○ Repositories
● CQRS
● SOA
○ Event Driven Architecture
● Event Sourcing
● Final Thoughts

15.
The Two Sides of Domain-Driven Design
Tactical
vs
Strategic

16.
DDD Tools
Strategic
Tactical

17.
Strategic

18.
Big Ball of Mud

19.
Strategic

20.
Effective design
with
Bounded Contexts

21.
Contexts aren’t just folders or “packages”
Everything could be a context
Even a microservice...

22.
Sales Support
DDDDDD

23.
Data-driven Context
Sales Support Account
CRUD!DDDDDD

24.
Big Ball of Mud as a Context
Sales Support Account
DDD DDD CRUD

25.
Big Ball of Mud as a Context
Sales Support Account Payment
Legacy
(big ball of mud)
DDD DDD CRUD

26.
Squads
Bounded Contexts

27.
Strategic

28.
Contex Map

29.
Contex Map - Shared Kernel
Contex Map - Customer/Supplier
Contex Map - Conformist
Contex Map - Partner
Contex Map - Open Host Service
Contex Map - Published Language

30.
Contex Map - Shared Kernel

31.
Contex Map - Anticorruption Layer

32.
Integration Approaches

33.
Strategic

34.
Integrating between bounded contexts
using
Domain Events

35.
Domain Events
http://udidahan.com/2009/06/14/domain-events-salvation/

36.
Domain Events

37.
Schedule
● Basic Concepts
● Ubiquitous Language
● Domain Expert
● Domain Model
● Architectures types
○ DDD,
○ Smart UI,
○ ...
● Strategic Design
○ Bounded Context
○ Context Maps
○ Domain Events
○ Event Storming
● Tactical Design (building
blocks)
○ Layered Architecture
○ Entities
○ Value Objects
○ Aggregates
○ Domain Services
○ Factories
○ Repositories
● CQRS
● SOA
○ Event Driven Architecture
● Event Sourcing
● Final Thoughts

38.
Tactical

39.
Layered Architecture
Domain
}Bounded Contexts

40.
Layered Architecture
}
CRUD Context
Bounded Contexts
Domain

41.
Layered Architecture

42.
Tactical

43.
Entities

44.
Tactical

45.
Value Objects

46.
Mostrar money object… bem melhor pra mostrar vo

47.
Tactical

48.
Aggregates

49.
Aggregates

50.
Aggregates

51.
Tactical

52.
Domain Services

53.
Domain Services
VS
Application Services

54.
Domain Service vs Application Service
Application Service
Domain Services
}

55.
Application Service

56.
Tactical

57.
Factories

58.
Factory Method

59.
Factory Object

60.
Tactical

61.
Repositories
Repositories

62.
Schedule
● Basic Concepts
● Ubiquitous Language
● Domain Expert
● Domain Model
● Architectures types
○ DDD,
○ Smart UI,
○ ...
● Strategic Design
○ Bounded Context
○ Context Maps
○ Domain Events
○ Event Storming
● Tactical Design (building
blocks)
○ Layered Architecture
○ Entities
○ Value Objects
○ Aggregates
○ Domain Services
○ Factories
○ Repositories
● CQRS
● SOA
○ Event Driven Architecture
● Event Sourcing
● Final Thoughts

63.
CAMADINHAS

64.
CQRS

65.
CQRS
Command

66.
CQRS
QueryCommand

67.
Integrating
between
external contexts

68.
EVENT SOURCING

69.
Schedule
● Basic Concepts
● Ubiquitous Language
● Domain Expert
● Domain Model
● Architectures types
○ DDD,
○ Smart UI,
○ ...
● Strategic Design
○ Bounded Context
○ Context Maps
○ Domain Events
○ Event Storming
● Tactical Design (building
blocks)
○ Layered Architecture
○ Entities
○ Value Objects
○ Aggregates
○ Domain Services
○ Factories
○ Repositories
● CQRS
● SOA
○ Event Driven Architecture
● Event Sourcing
● Final Thoughts

70.
Referências
https://github.com/VaughnVernon/IDDD_Samples_NET
https://github.com/heynickc/awesome-ddd

71.
Obrigado!
fabriciorissetto@gmail.com
fabriciorissetto