softwaremill / softwaremill/macwire

wire all implementations of given base trait/class

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Dominant language
Scala
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Description

building on the example of multi-wiring via wireSet would it be possible to achieve this:

trait Musician
class RockBand(musicians: Iterable[Musician])

class Singer extends Musician
class Guitarist extends Musician
class Drummer extends Musician
class Bassist extends Musician

trait RockBandModule {

  lazy val musicians: Iterable[Musician] = wireAll[Musician] // all above musicians classes will be instantiated

  lazy val rockBand  = wire[RockBand]
}

namely: have a wireAll[Base] method to instantiate all non-abstract classes derived from Base

it would be handy not to have to list all implementations (as in the wireSet example) of given trait and have it wired automatically so in case you add more implementations they will be added to the collection without any modifications to the module code

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked multi-wiring via wireSet example and inspect the existing wireSet API. Determine how a wireAll[Base] entry point should discover and instantiate all non-abstract implementations, including implementations added later. Done means the RockBand example can obtain the complete collection without listing each implementation.

Written by the indexing model from the issue text.

Assessment

Tech stack
scala
Domain
tooling
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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