DDD Workshop

bounded-context.md

Advanced Bounded Context Design

Maxime Sanglan-Charlier - https://blog.onehundredacorns.com/ Nick Tune - https://www.ntcoding.co.uk/ https://github.com/ddd-crew/bounded-context-canvas

Gray sky holidays

ddd.md

Domain-driven Design workshop

Instructor: Jimmy Bogard

Strategic Design

Not all subdomains require software!

Generic subdomains, might be good to outsource / integrate different product Supporting subdomains, low complexity / may or may not require (custom) software

Questions:

• Solved problem? Yes / No
• Competitive advantage? Important / Not important
• Complexity? High / Low
• Volatility? High / Low
• Implementation? In-house / Buy / Outsource
• Problem? Interesting / Solved / Obvious

Ubiquitous language: A single, shared language describing the busines domain

• Use same language in all layers (screen, api, code, database)

SKIL

Domains:

• Course
  • Course admin
  • Tasks (Meeting, Scorm, Forms)
  • Progress
  • Stats
  • Signup
  • Participant / Invitee / Admin
  • Meetings (Attendee)
  • Groups (Member / Previous member / Counselor / Leader)
• Forms
  • Edit form
  • View results
  • Answerset
    • Tasks Variants (these belong in respected domain/subdomain):
      • Variants is about who is allowed to create/edit/see them, and specifically Course which is a required Task to complete a course.
      • Each should have their own endpoints to create/updateAnswerset/view, but the API should be identical, so the frontend can be as simple as possible.
      • Variants:
        • Course-Anonumous *Regular form task w/Anonumous
        • Course *Regular form task
        • SKIL *Global forms
        • Office *New
        • Doctor *New
        • Kommunedashboard *New
        • Preview *Hack
• Kommunedashboard
  • Backoffice
  • Frontoffice
• Profile / Office
• Nefle
  • Setup
  • Venterom
• Automatic emails (core)
• Helfo (supporting domain)
• PraksisNett
• Authentication (keycloak, generic/supportiv subdomain?)

Tactical design

• Implement outbox pattern for Integration (old Domain) events, for example "UserCreated"
• Remove "SKIL Integration messages" like UserProfileChanged, and have the domain dispatch its own messages
• Async Events (Domain Events) vs Integration Events

Misc

Link domain to Sharepoint folder? upload files there instead of to S3?

Saga = Specialized Aggregate / Entity

Book tips

• Learning Domain-driven design, Khonov
• Event storming
• Value stream mapping
• Team Topologies, Matthew skelton
• Life beyond Distributed Transactions: an Apostate’s Opinion https://www.ics.uci.edu/~cs223/papers/cidr07p15.pdf