Event Sourcing + CQRS
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The document discusses event sourcing as a powerful pattern for managing state changes in systems, illustrating its application in user account balances and transaction logs. It explores concepts such as Command Query Responsibility Segregation (CQRS) versus traditional CRUD operations, highlighting the complexities involved in data modeling and replaying events. Additionally, it touches on external updates and notifications in the context of maintaining data consistency.
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Event Sourcing + CQRS
- 1. Event Sourcing THE BEST, UBIQUITOUS PATTERN YOU’VE NEVER HEARD OF @blimpyacht
- 5. 5
- 11. +4 -2 +5 +7 -4 +9 -3 -6 +2 +1 +1 -5 t(12) = 9 Event Sourcing
- 12. +4 -2 +5 +7 -4 +9 -3 -6 +2 +1 +1 -5 t(5) = 10 Event Sourcing
- 13. +4 -2 +5 +7 -4 +9 -3 -6 +2 +1 +1 -5 t(9) = 12 Event Sourcing
- 17. Res Gestae Divi Augusti
- 22. 2ndaryPrimary
- 23. 2ndaryPrimary
- 24. 2ndaryPrimary
- 26. +4 -2 +5 +7 -4 +9 -3 -6 +2 +1 +1 -5 t(4) = 14 Event Sourcing t(8) = 10 t(12) = 9
- 27. +4 -2 +5 +7 -4 +9 -3 -6 +2 +1 +1 -5 t(4) = 14 Event Sourcing t(8) = 10 t(12) = 9 t’(4) = -2 t’(8) = -17 t’(12) = -22
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- 33. Data Modeling Domain Events Domain Objects
- 35. Accounts Payable
- 40. CQRS
- 43. CRUD vs. CQRS
- 44. CRUD equals CQRS
- 46. WRITE READ Variant Read Models: VIEWS READ READ READ READ
- 49. Where it Gets Tricky
- 52. Consistent Replay +4 -2 +5 +7 -4 +9 -3 -6 +2 +1 +1 -5 t(5) = 10 Exchange Rate Server 10 / 0.88 = 8.82€
- 53. Consistent Replay +4 -2 +5 +7 -4 +9 -3 -6 +2 +1 +1 -5 t(5) = 10 Exchange Rate Server 10 / 0.87 = 8.70€
- 55. Where it Gets Trickier Still
- 64. Gaining Insight