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adds Stream.resourceK and Stream.resourceWeakK methods #2884

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merged 3 commits into from
Oct 17, 2022
Merged

adds Stream.resourceK and Stream.resourceWeakK methods #2884

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1e8a147
add Stream.resourceK method
Apr 11, 2022
371cc74
add Stream.resourceWeakK method
Apr 11, 2022
99121ef
Merge branch 'main' into stream-resourceK
mpilquist Oct 17, 2022
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12 changes: 12 additions & 0 deletions core/shared/src/main/scala/fs2/Stream.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3672,6 +3672,12 @@ object Stream extends StreamLowPriority {
def resource[F[_], O](r: Resource[F, O])(implicit F: MonadCancel[F, _]): Stream[F, O] =
resourceWeak(r).scope

/** Same as [[resource]], but expressed as a FunctionK. */
def resourceK[F[_]](implicit F: MonadCancel[F, _]): Resource[F, *] ~> Stream[F, *] =
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new (Resource[F, *] ~> Stream[F, *]) {
override def apply[A](fa: Resource[F, A]): Stream[F, A] = resource[F, A](fa)
}

/** Like [[resource]] but does not introduce a scope, allowing finalization to occur after
* subsequent appends or other scope-preserving transformations.
*
Expand All @@ -3691,6 +3697,12 @@ object Stream extends StreamLowPriority {
case Resource.Pure(o) => Stream.emit(o)
}

/** Same as [[resourceWeak]], but expressed as a FunctionK. */
def resourceWeakK[F[_]](implicit F: MonadCancel[F, _]): Resource[F, *] ~> Stream[F, *] =
new (Resource[F, *] ~> Stream[F, *]) {
override def apply[A](fa: Resource[F, A]): Stream[F, A] = resourceWeak[F, A](fa)
}

/** Converts the supplied [[java.lang.Autoclosable]] into a singleton stream. */
def fromAutoCloseable[F[_]: Sync, O <: AutoCloseable](fo: F[O]): Stream[F, O] =
Stream.resource(Resource.fromAutoCloseable(fo))
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