Building time machine with .net core
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This document summarizes a presentation about building a time machine using .NET Core and event sourcing. The presentation covers getting started with event sourcing, the history and concepts of event sourcing like commands, events, aggregates and projections. It also demonstrates a banking example and addresses challenges like replaying large numbers of events through rolling snapshots and fixing past issues by adding new events. The presentation aims to explain how to use event sourcing to build scalable and asynchronous applications that can rebuild state from immutable event records.
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Building time machine with .net core
- 1. Buildıng a tıme machine with .NET Core Alper Hankendi @alper_hankendi github.com/alperhankendi
- 2. Agenda ➔ Getting Started Event Sourcing ➔ History of Event Sourcing ➔ Building Aggregates ➔ Projections ➔ Rolling Snapshot ➔ Demo yey!
- 3. Join at slido.com #U520 Audience Q&A Session
- 4. Once upon a time...
- 8. COMMANDs >>> Event sourcing
- 9. COMMANDS vs events Command “Create Account” —> A request (imperative sentence) —> May fail —> May affect multiple Aggregates Rebuild Aggregate State From Commands
- 10. COMMANDS vs events Event “Account Created” —> Statement of fact (past tense) —> Never fails —> May affect a signle Aggregates —> Events are immutable Rebuild Aggregate State From Events
- 14. CQRS and Event sourcıng
- 15. A couple of concepts from ddd
- 17. Projections
- 18. Demo tıme!
- 20. How do I replay tons of events ? The problem is that there may be a large number of events between the beginning of time and the current point. You can imagine that an event stream with a million or more events would be inefficient to load.
- 21. The answer is “rollıng snapshot” Snapshot is a projection of the current state of an aggregate at a given point. It presents the state when all events to that point have been replayed.
- 22. UPS! The bank says “Where ıs my commısıon ffs”? You can’t delete events...
- 23. How we gonna fıx ıt? WithdrewFix you can fıx the past wıth adding a new event