Production-ready direct-style Scala

on YouTube ↗32m

" summary

A production-ready direct-style Scala microservice is built and demoed: a backend + React frontend with live-reload, automatic OpenAPI→TypeScript generation, and a new “next trip” feature that calls two external services in parallel, persists an audit row inside an explicit transaction, and streams audits to Kafka every second. Uses Tapir for HTTP, Magnum and Flyway for DB mapping and migrations, ox flows and virtual threads on JVM 21 for concurrency, and OpenTelemetry tracing; the demo runs end-to-end with propagated traces and Kafka messages.

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" chapters (14)

1. 0:00Direct-style Scala intro
2. 1:49Focus on direct-style Scala
3. 3:38Demo app overview and setup
4. 6:08Adding trip planning
5. 9:16Database transactions in direct style
6. 12:29Parallel HTTP requests and errors
7. 14:14Dependency injection with MacWire
8. 16:06API layer and OpenAPI
9. 19:57Java ecosystem with OpenTelemetry
10. 22:28Streaming with Kafka and Ox
11. 26:27Frontend with TypeScript
12. 28:34Key principles of direct-style Scala
13. 29:37Future plans and OSS
14. 31:27Summary and closing

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