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Implement ZLayerAspect #8391

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Sep 21, 2023
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Implement ZLayerAspect #8391

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01ccc43
implement zlayer aspect
adamgfraser Sep 16, 2023
2c9a3f5
format
adamgfraser Sep 16, 2023
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17 changes: 17 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 @@ -73,6 +73,23 @@ sealed abstract class ZLayer[-RIn, +E, +ROut] { self =>
)(implicit ev: CanFail[E], trace: Trace): ZLayer[RIn1, E1, ROut1] =
self.orElse(that)

/**
* Returns a new layer that applies the specified aspect to this layer.
* Aspects are "transformers" that modify the behavior of their input in some
* well-defined way (for example, adding a timeout).
*/
final def @@[
LowerRIn <: UpperRIn,
UpperRIn <: RIn,
LowerE >: E,
UpperE >: LowerE,
LowerROut >: ROut,
UpperROut >: LowerROut
](
aspect: => ZLayerAspect[LowerRIn, UpperRIn, LowerE, UpperE, LowerROut, UpperROut]
)(implicit trace: Trace): ZLayer[UpperRIn, LowerE, LowerROut] =
ZLayer.suspend(aspect(self))

/**
* A named alias for `++`.
*/
Expand Down
98 changes: 98 additions & 0 deletions core/shared/src/main/scala/zio/ZLayerAspect.scala
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Original file line number Diff line number Diff line change
@@ -0,0 +1,98 @@
package zio

import zio.stacktracer.TracingImplicits.disableAutoTrace

trait ZLayerAspect[+LowerRIn, -UpperRIn, +LowerE, -UpperE, +LowerROut, -UpperROut] { self =>

def apply[RIn >: LowerRIn <: UpperRIn, E >: LowerE <: UpperE, ROut >: LowerROut <: UpperROut](
layer: ZLayer[RIn, E, ROut]
)(implicit
trace: Trace
): ZLayer[RIn, E, ROut]

def >>>[
LowerRIn1 >: LowerRIn,
UpperRIn1 <: UpperRIn,
LowerE1 >: LowerE,
UpperE1 <: UpperE,
LowerROut1 >: LowerROut,
UpperROut1 <: UpperROut
](
that: ZLayerAspect[LowerRIn1, UpperRIn1, LowerE1, UpperE1, LowerROut1, UpperROut1]
): ZLayerAspect[LowerRIn1, UpperRIn1, LowerE1, UpperE1, LowerROut1, UpperROut1] =
self.andThen(that)

/**
* Returns a new aspect that represents the sequential composition of this
* aspect with the specified one.
*/
def @@[
LowerRIn1 >: LowerRIn,
UpperRIn1 <: UpperRIn,
LowerE1 >: LowerE,
UpperE1 <: UpperE,
LowerROut1 >: LowerROut,
UpperROut1 <: UpperROut
](
that: ZLayerAspect[LowerRIn1, UpperRIn1, LowerE1, UpperE1, LowerROut1, UpperROut1]
): ZLayerAspect[LowerRIn1, UpperRIn1, LowerE1, UpperE1, LowerROut1, UpperROut1] =
self >>> that

def andThen[
LowerRIn1 >: LowerRIn,
UpperRIn1 <: UpperRIn,
LowerE1 >: LowerE,
UpperE1 <: UpperE,
LowerROut1 >: LowerROut,
UpperROut1 <: UpperROut
](
that: ZLayerAspect[LowerRIn1, UpperRIn1, LowerE1, UpperE1, LowerROut1, UpperROut1]
): ZLayerAspect[LowerRIn1, UpperRIn1, LowerE1, UpperE1, LowerROut1, UpperROut1] =
new ZLayerAspect[LowerRIn1, UpperRIn1, LowerE1, UpperE1, LowerROut1, UpperROut1] {
def apply[RIn >: LowerRIn1 <: UpperRIn1, E >: LowerE1 <: UpperE1, ROut >: LowerROut1 <: UpperROut1](
layer: ZLayer[RIn, E, ROut]
)(implicit trace: Trace): ZLayer[RIn, E, ROut] =
that(self(layer))
}
}

object ZLayerAspect {

/**
* An aspect that prints the results of layers to the console for debugging
* purposes.
*/
val debug: ZLayerAspect[Nothing, Any, Nothing, Any, Nothing, Any] =
new ZLayerAspect[Nothing, Any, Nothing, Any, Nothing, Any] {
def apply[RIn, E, ROut](layer: ZLayer[RIn, E, ROut])(implicit trace: Trace): ZLayer[RIn, E, ROut] =
layer.debug
}

/**
* An aspect that prints the results of a layer to the console for debugging
* purposes, using a specified user-defined prefix label.
*/
def debug(prefix: => String): ZLayerAspect[Nothing, Any, Nothing, Any, Nothing, Any] =
new ZLayerAspect[Nothing, Any, Nothing, Any, Nothing, Any] {
override def apply[RIn, E, ROut](layer: ZLayer[RIn, E, ROut])(implicit trace: Trace): ZLayer[RIn, E, ROut] =
layer.debug(prefix)
}

/**
* An aspect that returns layers unchanged.
*/
val identity: ZLayerAspect[Nothing, Any, Nothing, Any, Nothing, Any] =
new ZLayerAspect[Nothing, Any, Nothing, Any, Nothing, Any] {
def apply[RIn, E, ROut](layer: ZLayer[RIn, E, ROut])(implicit trace: Trace): ZLayer[RIn, E, ROut] =
layer
}

/**
* An aspect that retries layers according to the specified schedule.
*/
def retry[RIn1, E1](schedule: Schedule[RIn1, E1, Any]): ZLayerAspect[Nothing, RIn1, Nothing, E1, Nothing, Any] =
new ZLayerAspect[Nothing, RIn1, Nothing, E1, Nothing, Any] {
def apply[RIn <: RIn1, E <: E1, ROut](layer: ZLayer[RIn, E, ROut])(implicit trace: Trace): ZLayer[RIn, E, ROut] =
layer.retry(schedule)
}
}