DOMAIN-DRIVEN DESIGN, CQRS AND EVENT SOURCING Vladimir Shalamanov Nikola Bogdanov
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DOMAIN-DRIVEN DESIGN, CQRS AND EVENT SOURCING
Vladimir ShalamanovNikola Bogdanov
WhereWe are always in a hurry
Where
Where~45 minutes later
Where… it could be much easier
REWE Digital Domain
About Us
VladoNikola
Microservices
DDD
Event Sourcing
CQRS
Demo
WhereMicro Services
Microservices
Tackle complexity via Modularization
Quick and Efficient Scaling
https://www.martinfowler.com/articles/microservices.html
Microservices
Based on Business Capabilities
Decentralized Governance
https://www.martinfowler.com/articles/microservices.html
Microservices
Decentralized Data management
Smart Endpoints and Dumb Pipes
Infrastructure Automation
https://www.martinfowler.com/articles/microservices.html
Microservices
Design for Failure
Evolutionary Design
https://www.martinfowler.com/articles/microservices.html
Demo
Imagine You are a Photographer
PhotographerCameraPhoto Photo
REWE Portfolio Service Photo
Upload Service
REST
Photo
REWE Photo Library
Kafka
Checkout my Kubernetes cluster
Domain Driven Design
Universal Domain Model is not needed
Bounded Context
Domain ModelBounded Context
Ubiquitous Language
Domain ModelBounded Context
Ubiquitous Language
Context Map
Domain ModelBounded Context
Explicit Boundaries
Context Map
REWE Digital Domain Model
Design inside a bounded context
Now code
So a photos related service?
PhotoService.java
Now code
Really a photos related service?
PhotoService.javaCameraService.java
Now code
What about the people?
PhotoService.javaCameraService.javaPhotographer.java
Consistency problem
Event Sourcing
From CRUD
To Events
https://martinfowler.com/bliki/CQRS.html https://martinfowler.com/eaaDev/EventSourcing.html
Event Sourcing
From CRUD
To Events
https://martinfowler.com/bliki/CQRS.html https://martinfowler.com/eaaDev/EventSourcing.html
Event Sourcing
From CRUD
To Events
https://martinfowler.com/bliki/CQRS.html https://martinfowler.com/eaaDev/EventSourcing.html
Benefits
Complete rebuild is possible
Temporal queries
Debugging
https://martinfowler.com/bliki/CQRS.html https://martinfowler.com/eaaDev/EventSourcing.html
Benefits
Suitable for transactional domains
Focus in domain behavior
Think temporal about your system
https://martinfowler.com/bliki/CQRS.html https://martinfowler.com/eaaDev/EventSourcing.html
Multiple Application States
(CQRS)
Command Query Responsibility Segregation
CQRS
Command Query Responsibility Segregation
CQRS + Event Sourcing
Demo? Where?
Thank You!Find us in LinkedIn
Q & A
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