/
customComponentTypes.scala
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/
customComponentTypes.scala
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package pl.touk.nussknacker.engine.lite.api
import cats.data.ValidatedNel
import cats.{Monad, ~>}
import pl.touk.nussknacker.engine.api.Context
import pl.touk.nussknacker.engine.api.context.ProcessCompilationError
import pl.touk.nussknacker.engine.api.process.{Sink, Source}
import pl.touk.nussknacker.engine.api.typed.typing.TypingResult
import pl.touk.nussknacker.engine.lite.api.commonTypes.{DataBatch, ErrorType, ResultType}
import scala.language.higherKinds
import scala.reflect.runtime.universe._
object customComponentTypes {
// Some components work with any monad (e.g. Union, Split etc.) Some require specific monad (e.g. State, probably transactional Kafka)
// This trait allows to convert effects if it's possible. See sample.SumTransformer for usage
// More complex implementations would allow e.g. to transform State[StateType, _] => Future[State[StateType, _]] and so on
trait CapabilityTransformer[Target[_]] {
def transform[From[_]](implicit tag: TypeTag[From[Any]]): ValidatedNel[ProcessCompilationError, From ~> Target]
}
case class CustomComponentContext[F[_]](
nodeId: String,
capabilityTransformer: CapabilityTransformer[F]
)
trait LiteSource[Input] extends Source {
def createTransformation[F[_]: Monad](
evaluateLazyParameter: CustomComponentContext[F]
): Input => ValidatedNel[ErrorType, Context]
}
trait LiteCustomComponent {
// Result is generic parameter, as Component should not change it/interfer with it
def createTransformation[F[_]: Monad, Result](
continuation: DataBatch => F[ResultType[Result]],
context: CustomComponentContext[F]
): DataBatch => F[ResultType[Result]]
}
case class BranchId(value: String)
case class JoinDataBatch(value: List[(BranchId, Context)])
trait LiteJoinCustomComponent {
def createTransformation[F[_]: Monad, Result](
continuation: DataBatch => F[ResultType[Result]],
context: CustomComponentContext[F]
): JoinDataBatch => F[ResultType[Result]]
}
trait LiteSink[Res] extends Sink {
def createTransformation[F[_]: Monad](
evaluateLazyParameter: CustomComponentContext[F]
): (TypingResult, DataBatch => F[ResultType[(Context, Res)]])
}
}