Current state vs. (eve)nt sourcing
summary
A lightweight Clojure framework called Eve extracts event sourcing and CQRS helpers from a production codebase and provides functions to: append immutable event maps with an explicit _position logical clock, rebuild state with reduce and snapshots, and have command handlers return sequences of events that update write models; the event store is designed as an append-only durable key–value store; library exists but ships without documentation yet and is slated for release soon.
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chapters (10)
- 0:00Introduction
- 1:33Motivation for event sourcing
- 4:24Event sourcing example
- 9:55Advantages over current state
- 15:17Three-layer vs CQS
- 18:30CQS architecture
- 24:06Domain-driven design and aggregates
- 28:24Repository and state
- 34:12Introducing E library
- 35:43Q&A
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