The World's Shortest and Most Chaotic Introduction to Event Storming

Transcript

1. The World's Shortest and Most Chaotic Introduction to Event Storming

   @mathiasverraes @jbpros

2. Mathias Verraes Independent Consultant @mathiasverraes verraes.net

3. Julien Biezemans Co-founder at Cucumber @jbpros

4. None

5. The Grand Dichotomy of Systems1 Things vs Processes 1 "Rethinking

   System Analysis and Design" — Gerald M. Weinberg

6. Event Storming: visually modelling behaviour over time

7. Today: Big Picture Event Storming Exploration — Ubiquitous Language —

   Processes

8. Going further: Design Level Event Storming Precision — Constraints —

   Processes Dependencies — Messaging — Event Sourcing Bounded Contexts — Concurrency — Race Conditions — ...
9. None

10. Domain Event Something has happened in the past that is

    relevant to the business Past tense: Trip has Started

11. Command An instruction that a user (or another system) sends

    to your system Imperative: Start Trip

12. Business Rule A constraint that determines the outcome (Events) of

    a particular Command

13. Given there is a user vs Given a user has

    registered Given Event And Event When Command Then Event

14. @mathiasverraes verraes.net