Domain Driven Design Workshop

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

17. 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

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

19. DDD Tools
Strategic
Tactical

20. Strategic

21. Big Ball of Mud

28. Strategic

29. Effective design
with
Bounded Contexts

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

33. Sales Support
DDDDDD

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

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

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

37. Squads
Bounded Contexts

38. Strategic

39. Contex Map

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

41. Contex Map - Shared Kernel

42. Contex Map - Anticorruption Layer

43. Integration Approaches

44. Strategic

45. Integrating between bounded contexts
using
Domain Events

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

47. Domain Events

48. 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

49. Tactical

50. Layered Architecture
Domain
}Bounded Contexts

51. Layered Architecture
}
CRUD Context
Bounded Contexts
Domain

52. Layered Architecture

53. Tactical

54. Entities

56. Tactical

57. Value Objects

58. Mostrar money object… bem melhor pra mostrar vo

60. Tactical

61. Aggregates

62. Aggregates

63. Aggregates

65. Tactical

66. Domain Services

67. Domain Services
VS
Application Services

68. Domain Service vs Application Service
Application Service
Domain Services
}

69. Application Service

70. Tactical

71. Factories

72. Factory Method

73. Factory Object

74. Tactical

75. Repositories
Repositories

77. 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

78. CAMADINHAS

79. CQRS

80. CQRS
Command

81. CQRS
QueryCommand

82. Integrating
between
external contexts

83. EVENT SOURCING

84. 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

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

86. Obrigado!
fabriciorissetto@gmail.com
fabriciorissetto