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Backport ZLayer#flatmap To ZIO 1.0 #5372

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Merged
merged 1 commit into from
Aug 10, 2021
Merged

Backport ZLayer#flatmap To ZIO 1.0 #5372

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13 changes: 13 additions & 0 deletions core/shared/src/main/scala/zio/ZLayer.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,14 @@ sealed abstract class ZLayer[-RIn, +E, +ROut] { self =>
fold(failureOrDie >>> handler, ZLayer.identity)
}

/**
* Constructs a layer dynamically based on the output of this layer.
*/
final def flatMap[RIn1 <: RIn, E1 >: E, ROut2](
f: ROut => ZLayer[RIn1, E1, ROut2]
): ZLayer[RIn1, E1, ROut2] =
ZLayer.Flatten(self.map(f))

/**
* Feeds the error or output services of this layer into the input of either
* the specified `failure` or `success` layers, resulting in a new layer with
Expand Down Expand Up @@ -284,6 +292,8 @@ sealed abstract class ZLayer[-RIn, +E, +ROut] { self =>

private final def scope: Managed[Nothing, ZLayer.MemoMap => ZManaged[RIn, E, ROut]] =
self match {
case ZLayer.Flatten(self) =>
ZManaged.succeed(memoMap => memoMap.getOrElseMemoize(self).flatMap(memoMap.getOrElseMemoize))
case ZLayer.Fold(self, failure, success) =>
ZManaged.succeed(memoMap =>
memoMap
Expand All @@ -310,6 +320,9 @@ object ZLayer {
@deprecated("use Layer", "1.0.0")
type NoDeps[+E, +B] = ZLayer[Any, E, B]

private final case class Flatten[-RIn, +E, +ROut](
self: ZLayer[RIn, E, ZLayer[RIn, E, ROut]]
) extends ZLayer[RIn, E, ROut]
private final case class Fold[RIn, E, E1, ROut, ROut1](
self: ZLayer[RIn, E, ROut],
failure: ZLayer[(RIn, Cause[E]), E1, ROut1],
Expand Down