Introduction to cqrs
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Slides from Code Mastery meetup 22 Mar 2017
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Introduction to cqrs
- 1. CQRS EXPLAINED DARIUSZ SADOWSKI (@DARSADOW)
- 2. AT THE BEGINNING THERE WAS CRUD
- 5. COMMAND
- 6. QUERY
- 7. FIRST STEP INTO BETTER WORLD
- 8. REAL WORLD
- 9. IN PRACTICE ▸Command as a Request ▸Command Handler ▸Response is optional ▸… but it can be very helpful ▸State is still your main concern
- 10. STATE CHANGE ONLY IN COMMAND HANDLER
- 11. COMMAND REFLECTS ONE INTERACTION WITH THE SYSTEM
- 12. WHEN INTERACTION CHANGES ONLY ONE HANDLER NEEDS TO CHANGE
- 14. LETS ADD THE MISSING “R”
- 16. WRITE MODEL
- 17. READ MODEL
- 18. BUT WHY?
- 19. WHY TO SEPARATE READ MODEL? ▸Prepare data for many different views ▸Transformation at write to keep data readable ▸Integration with other systems ▸Performance
- 20. LETS TALK ABOUT WHAT HAPPENED
- 21. EVENT IS A DESCRIPTION OF THE FACT OF THE PAST
- 22. COMMAND IS A COMMAND ;)
- 23. FROM COMMAND TO THE EVENT
- 24. EVENT CAN BE ADDED BUT CAN’T BE MODIFIED
- 26. WHEN YOU KNOW WHAT HAPPENED YOU CAN DO QUITE A LOT WITH IT
- 27. TEXT {GOOD THINGS} ABOUT EVENT SOURCING ▸Replay-ability ▸Undo ▸Audit trail ▸Reactive system modelling
- 29. SUMMARY
- 30. THANK YOU