The framework-less Scala Dependency Injection framework
summary
Live-coding shows replacement of DI containers with pure, type-safe Scala: manual constructor wiring, then using the wire[] macro from the acquire library, producing the same bytecode as handwritten new calls. Uses lazy vals to get correct initialization order and simple scoping to create per-application or per-user singletons, modules to swap implementations, Java proxy–based interceptors for AOP, and a Play integration. Everything compiles and runs in the demos, enabling easier testing and modular configuration.
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chapters (15)
- 0:00Framework-less Scala DI
- 1:54Avoiding traditional DI
- 3:51Live coding restaurant
- 9:03Lazy vals for init order
- 10:08Acquire library automation
- 12:59Singleton dependencies in modules
- 15:29Reusable wiring modules
- 18:22Module dependencies with types
- 20:32Swapping implementations
- 25:19Adding interceptors
- 29:18Testing with interceptors
- 32:11Play Framework integration
- 35:24Alternatives and patterns
- 36:59Resources and contribution
- 38:30Q&A
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