Designing a Multi-Language Live Programming Tool With Phoenix and Genstage
summary
Nextjournal becomes a browser‑based live programming environment that actually runs code in isolated Docker images, exchanges structured values via JSON/Transit, and wires cells into a directed runtime graph using GenStage so only dependent nodes reexecute. Browser sync and updates flow over Phoenix channels, each evaluation happens in an Erlang port to a language runtime, and the system surfaces execution results and errors back to the editor immediately.
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chapters (9)
- 0:00Introduction and motivation
- 2:16Nextjournal core features
- 4:21Data flow and cell logic
- 8:30System architecture
- 12:12Evolution of the backend
- 15:00Implementing GenStage
- 21:54Execution life cycle
- 27:30Final remarks
- 29:57Q&A session
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