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• 0.27.0
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• EntityRunFunctions.scala

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endless.core.interpret.EntityRunFunctions.scala Maven / Gradle / Ivy

package endless.core.interpret

import cats.conversions.all.*
import cats.data.{Chain, NonEmptyChain}
import cats.syntax.applicative.*
import cats.syntax.either.*
import cats.{Applicative, Monad}
import endless.core.data.{EventsFolder, Folded}

trait EntityRunFunctions {
  def pure[F[_]: Applicative, S, E, A](a: A)(events: Chain[E]): F[Folded[E, A]] =
    (events, a).asRight.pure

  def read[F[_]: Monad, S, E](
      folder: EventsFolder[S, E],
      events: Chain[E]
  ): F[Folded[E, Option[S]]] = folder.applyOnFoldable(events).map((events, _)).pure

  def write[F[_]: Applicative, S, E](
      newEvents: NonEmptyChain[E]
  )(existingEvents: Chain[E]): F[Folded[E, Unit]] =
    (existingEvents ++ newEvents.toChain, ()).asRight.pure
}