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Getting Started: Domain-Driven Design
Course overview
Welcome (1:11)
What will you learn in this course? (2:13)
Who is the course for and prerequisites (3:10)
Introduction to Domain-Driven Design
What is Domain-Driven Design? (1:27)
What is a Domain? (4:26)
Why you should learn and practice DDD (2:19)
The two parts of DDD (4:57)
Section Recap (1:47)
Exploring a Complex Domain
The domain we’ll be exploring (6:06)
The domain’s Ubiquitous Language (4:30)
Ubiquitous Language as a tool for detecting Domain Objects (3:41)
The domain’s invariants (3:00)
Enforcing invariants (2:44)
Creating the domain objects (5:20)
Invariants as Unit Tests (10:41)
Enforcing Invariants that rely on dependencies (12:22)
The Result Pattern (10:08)
Section Recap (2:10)
Tactical Design and Patterns
What are Tactical Patterns? (3:15)
What is Tactical Design? (3:33)
Entities (3:49)
Implementing the Entity base class (2:23)
Value Objects (7:29)
Implementing the Value Object base class (2:39)
Aggregates (6:02)
Shifting the focus to Aggregates (6:16)
Implementing the Aggregate base class (1:09)
Structuring the Domain Layer around Aggregates (8:34)
Domain Services (5:32)
Factories (3:34)
Implementing a Static Factory Method (5:05)
Repositories (4:40)
Disconnected Domain Models (1:40)
Repositories and EF Core (3:18)
Implementing a Repository (3:14)
Section Recap (1:16)
Domain Events
Accessing the Domain Layer via a web API (4:49)
A system without Domain Events (6:45)
Eventual Consistency (1:16)
What is a Domain Event? (5:27)
The Domain Event Sausage Factory (6:43)
Implementing a Domain Event (6:41)
Section Recap (1:23)
Key Domain Modeling Rules
Domain Modeling & Analysis Paralysis (1:41)
Domain Model Identity Uniqueness (2:28)
Domain Object Deletion (3:38)
One Aggregate Per Transaction (3:21)
Reference Between Domain Models (3:43)
Section Recap (0:55)
Key Concepts
Application Services vs Domain Services (5:11)
Transactional vs. Eventual Consistency (5:08)
Rich vs. Anemic Domain Models (3:57)
Always Valid vs. Not Always Valid (2:32)
Persistence Ignorance (1:09)
Section Recap (1:20)
Strategic Design
What is Strategic Design? (4:41)
Sub-Domains (3:30)
The 3 types of Sub-Domains (3:40)
Context Mapping and Context Maps (4:14)
Context Map example (4:43)
Team Relationships (1:44)
Context Map Patterns (3:07)
Section Recap (1:18)
Bounded Contexts
Bounded Contexts (5:29)
Bounded Contexts vs. Sub-Domains (Problem vs. Solution Space) (5:17)
Exploring our Domain’s Bounded Contexts (4:06)
Exploring relationships between our Bounded Contexts (6:10)
Defining our Context Map (5:00)
Section Recap (1:09)
Integration Events
What are Integration Events? (2:46)
The chain of Integration and Domain Events (4:21)
Using a Message Broker for distributing Integration Events (4:29)
Error handling when publishing Integration Events (3:56)
The Outbox Pattern (4:25)
The Integration Events Sausage Factory - Outbox Writer (4:18)
The Integration Events Sausage Factory - Integration Event Publisher (1:56)
The Integration Events Sausage Factory - Consuming Integration Events (5:17)
Section Recap (0:45)
Conclusion
Conclusion (1:31)
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Application Services vs Domain Services
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