Day to day stuff: December 2022

Sunday, December 4, 2022

ZIO service layer pattern

While reading about ZIO-config in 2.0.4, the following pattern to create services caught my eye. I am copying it here for easy lookup. Enjoy.

val myLayer: ZLayer[PaymentRepo, Nothing, MyService] = 
  ZLayer.scoped {
    for {
      repo   <- ZIO.service[PaymentRepo]
      config <- ZIO.config(MyServiceImpl.config)
      ref    <- Ref.make(MyState.Initial)
      impl   <- ZIO.succeed(new MyServiceImpl(config, ref, repo))
      _      <- impl.initialize
      _      <- ZIO.addFinalizer(impl.destroy)
    } yield impl
  }