DDD

Concepts

Ubiquitous language

• use the same terms in code as the user use
• have common language between delivery team and actual people (aka customers)
  • helps to understand business by logic
  • helps with communication
• use real-world language in code

Aggregates

• a representatino of real domain concept
  • something like an Order, an Invoice, Stock Item
• aggregates typically have an information cycle around them
• in general
  • aggregate as something that has
    • state
    • identity
    • information cycle
      • that will be managed as part of the system
• aggregates can have relationships to other aggregates

Bounded context

• a larger organizational boundary
  • within it explicit responsibilities need to be carried out
• bounded contexts hide implementation details ()
• bounded contexts contain 1-n aggregates
  • some aggregates may be exposed outside the bounded context
  • others may be hidden internally

Event Storming

• collaborative brainstorming exercise designed to help design a domain model
• invented by Alberto Brandolini

Boundaries between microservices

• There are some factors when defining clear boundaries between Microservices
  • volatility
  • data
    • also with concern to security
  • technology
  • organizational
    • Layering Inside vs Layering Outside

Resources

• 2024-04-18 ◦ Domain Driven Design - Awesome Software Architecture
• 2024-02-01 ◦ Warum spricht jeder über DDD?
• 2024-02-01 ◦ DDD Beyond the Basics: Mastering Aggregate Design | by Mario Bittencourt | SSENSE-TECH | Medium
• 2024-02-01 ◦ Introduction - Domain Driven Microservices on AWS in Practice
• 2024-02-01 ◦ GitHub - ddd-crew/free-ddd-learning-resources: A collection of resources for learning DDD. All are free to access.
• 2024-02-01 ◦ GitHub - AlexNek/ddd-for-developers: Domain Driver Design - Overview for Software Developers
• 2023-05-11 ◦ Domain-Driven Design: Bridging the Gap Between Business and Technology
• 2023-03-13 ◦ A gentle introduction to Domain Driven Design | by The Lone Architect | Medium
• 2022-12-01 ◦ Michael Plöd (@mploed) on Speaker Deck
  • Hands-on Domain-driven Design - by Example (on leanpub)
  • writes about DDD in general