Introduction to Event sourcing, it's benefits and challenges.

1. fromSumerian clay tablets to modern 21st century software
Event Sourcing

2. Hadi Ahmadi
HAhmadi15
Ahmadi.hadi@outlook.com

3. Commands -Events
Actor
Command
Application
Event
Event
Event

4. EventsCommands
OpenTicket TicketOpened
RegisterUser UserRegistered
PlaceBid BidPlaced

5. Data as Last state

6. Data as series ofevents

7. “Current State is Transient”
G r e g Yo u n g

9. Ancient Sumerians wrote accounting info on clay tablets and
baked them

10. “Looking at mature domains it is
odd that almost none have a
concept of current state”
G r e g Yo u n g

11. Bright Side

12. “ Data is the new oil”
- Clive Humby

13. Are they the same?

14. Domain Analysis

15. Performance

16. What about queries?

17. CQRS

18. Projections

19. Debugging
Time Traveling
Domain Functionality

20. Simplicity

21. Dark Side

22. Eventual Consistency

23. How most developers see Eventual
consistency

25. What is the business risk of
having a failure?

26. Versioning

27. THANK YOU