Durable Event-sourced Workflow Monad... Seriously!
summary
Workflows4s is a Scala 3 library that implements event-sourced persistence and a declarative workflow DSL with signals, timers, error channels, forks, loops and embedded subworkflows, requiring only a database not a separate server. Runtimes include in-memory, Postgres and Pekko and an odd per-instance SQLLight file storage, plus timer backends like quartz. It is a proof-of-concept that runs and visualizes instances via BPMN or mermaid, production-ready-ish but missing migration/versioning strategy and polish.
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chapters (8)
- 0:00Introduction and history
- 1:06Understanding workflows
- 4:40Challenges with existing tools
- 8:33Defining Workflows4s
- 14:19Workflow runtimes and design
- 17:14Runtimes and knocker-uppers
- 21:06Visualization and debugging
- 23:34Conclusion and future outlook
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