kotlin-compiler-di

Introduction: Experiment with Kotlin compiler code generation
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An experiment on the idea of Google's Dagger using different means of code generation: Kotlin compiler.

For now I continue working on implementing richer feature-set. Most of the code is generated in frontend using KotlinPoet. IDE support works out of the box (at least for JB products) thanks to gradle integration. As a side effect of this project, I am exploring how DI can be done better using Kotlin (in compile time safe way).

If you, for any reason, want to look through this:

  • The plugin files are in: buildSrc/compiler-plugin/kotlin-plugin (this is what attaches to compiler)
  • The test project files is in src/main/kotlin (this is what gets compiled)

Right now I have implemented the concept of:

  • exposing dependencies through Component.
  • providing them through Module implemented as object or class instance.
  • providing using @Inject annotated constructor
  • inject dependencies into @Inject annotated fields
  • inject dependencies into @Inject annotated functions (one param only)
  • local scoping inside component using @Scope annotations
  • provide external dependencies using @Factory
  • Support of @BindsInstance for components
  • Support for @Qualifier
  • external dependencies through @Builder
  • Default builder
  • Type mapping using @Binds
  • Lazy and Provider support

TODO (in any order):

  • Default module instantiation when class has an empty constructor
  • Reusable support
  • IntoSet / IntoMap
  • Subcomponents
  • Proper scope support
  • ... the rest

To launch test file

Use ./gradlew run. It will build and install plugin to maven local, after it will compile the test project using freshly built plugin and run it. Yay!

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