sealed abstract class ZLayer[-RIn, +E, +ROut] extends AnyRef
A ZLayer[A, E, B]
describes a layer of an application: every layer in an
application requires some services (the input) and produces some services
(the output).
Layers can be thought of as recipes for producing bundles of services, given their dependencies (other services).
Construction of layers can be effectful and utilize resources that must be acquired and safely released when the services are done being utilized.
By default layers are shared, meaning that if the same layer is used twice the layer will only be allocated a single time.
Because of their excellent composition properties, layers are the idiomatic way in ZIO to create services that depend on other services.
- Self Type
- ZLayer[RIn, E, ROut]
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- ZLayer
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final
def
!=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
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final
def
##(): Int
- Definition Classes
- AnyRef → Any
- final def +!+[E1 >: E, RIn2, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2])(implicit ev: UnionAll[ROut1, ROut2]): ZLayer[RIn with RIn2, E1, ROut1 with ROut2]
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final
def
++[E1 >: E, RIn2, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2])(implicit ev: Union[ROut1, ROut2], tag: zio.Tag[ROut2]): ZLayer[RIn with RIn2, E1, ROut1 with ROut2]
Combines this layer with the specified layer, producing a new layer that has the inputs of both layers, and the outputs of both layers.
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final
def
<&>[E1 >: E, RIn2, ROut2](that: ZLayer[RIn2, E1, ROut2]): ZLayer[RIn with RIn2, E1, (ROut, ROut2)]
A symbolic alias for
zipPar
. -
def
<>[RIn1 <: RIn, E1, ROut1 >: ROut](that: ZLayer[RIn1, E1, ROut1])(implicit ev: CanFail[E]): ZLayer[RIn1, E1, ROut1]
A symbolic alias for
orElse
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final
def
==(arg0: Any): Boolean
- Definition Classes
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-
final
def
>+>[E1 >: E, RIn2 >: ROut, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2])(implicit ev: Union[ROut1, ROut2], tagged: zio.Tag[ROut2]): ZLayer[RIn, E1, ROut1 with ROut2]
Feeds the output services of this layer into the input of the specified layer, resulting in a new layer with the inputs of this layer, and the outputs of both this layer and the specified layer.
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final
def
>>>[E1 >: E, ROut2](that: ZLayer[ROut, E1, ROut2]): ZLayer[RIn, E1, ROut2]
Feeds the output services of this layer into the input of the specified layer, resulting in a new layer with the inputs of this layer, and the outputs of the specified layer.
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final
def
and[E1 >: E, RIn2, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2])(implicit ev: Union[ROut1, ROut2], tagged: zio.Tag[ROut2]): ZLayer[RIn with RIn2, E1, ROut1 with ROut2]
A named alias for
++
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final
def
andTo[E1 >: E, RIn2 >: ROut, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2])(implicit ev: Union[ROut1, ROut2], tagged: zio.Tag[ROut2]): ZLayer[RIn, E1, ROut1 with ROut2]
A named alias for
>+>
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final
def
asInstanceOf[T0]: T0
- Definition Classes
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final
def
build: ZManaged[RIn, E, ROut]
Builds a layer into a managed value.
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final
def
catchAll[RIn1 <: RIn, E1, ROut1 >: ROut](handler: ZLayer[(RIn1, E), E1, ROut1]): ZLayer[RIn1, E1, ROut1]
Recovers from all errors.
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def
clone(): AnyRef
- Attributes
- protected[lang]
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- @throws( ... ) @native()
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final
def
eq(arg0: AnyRef): Boolean
- Definition Classes
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def
equals(arg0: Any): Boolean
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-
def
finalize(): Unit
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- protected[lang]
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- @throws( classOf[java.lang.Throwable] )
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final
def
fold[E1, RIn1 <: RIn, ROut2](failure: ZLayer[(RIn1, Cause[E]), E1, ROut2], success: ZLayer[ROut, E1, ROut2])(implicit ev: CanFail[E]): ZLayer[RIn1, E1, ROut2]
Feeds the error or output services of this layer into the input of either the specified
failure
orsuccess
layers, resulting in a new layer with the inputs of this layer, and the error or outputs of the specified layer. -
final
def
fresh: ZLayer[RIn, E, ROut]
Creates a fresh version of this layer that will not be shared.
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final
def
getClass(): Class[_]
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
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final
lazy val
hashCode: Int
Returns the hash code of this layer.
Returns the hash code of this layer.
- Definition Classes
- ZLayer → AnyRef → Any
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final
def
isInstanceOf[T0]: Boolean
- Definition Classes
- Any
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final
def
launch(implicit ev: <:<[Any, RIn]): IO[E, Nothing]
Builds this layer and uses it until it is interrupted.
Builds this layer and uses it until it is interrupted. This is useful when your entire application is a layer, such as an HTTP server.
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final
def
map[ROut1](f: (ROut) ⇒ ROut1): ZLayer[RIn, E, ROut1]
Returns a new layer whose output is mapped by the specified function.
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final
def
mapError[E1](f: (E) ⇒ E1)(implicit ev: CanFail[E]): ZLayer[RIn, E1, ROut]
Returns a layer with its error channel mapped using the specified function.
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final
def
memoize: ZManaged[Any, Nothing, ZLayer[RIn, E, ROut]]
Returns a managed effect that, if evaluated, will return the lazily computed result of this layer.
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final
def
ne(arg0: AnyRef): Boolean
- Definition Classes
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-
final
def
notify(): Unit
- Definition Classes
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- @native()
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final
def
notifyAll(): Unit
- Definition Classes
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- @native()
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final
def
orDie(implicit ev1: <:<[E, Throwable], ev2: CanFail[E]): ZLayer[RIn, Nothing, ROut]
Translates effect failure into death of the fiber, making all failures unchecked and not a part of the type of the layer.
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final
def
orElse[RIn1 <: RIn, E1, ROut1 >: ROut](that: ZLayer[RIn1, E1, ROut1])(implicit ev: CanFail[E]): ZLayer[RIn1, E1, ROut1]
Executes this layer and returns its output, if it succeeds, but otherwise executes the specified layer.
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final
def
retry[RIn1 <: RIn with Clock](schedule: Schedule[RIn1, E, Any]): ZLayer[RIn1, E, ROut]
Retries constructing this layer according to the specified schedule.
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final
def
synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
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final
def
tap[RIn1 <: RIn, E1 >: E](f: (ROut) ⇒ ZIO[RIn1, E1, Any]): ZLayer[RIn1, E1, ROut]
Performs the specified effect if this layer succeeds.
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final
def
tapError[RIn1 <: RIn, E1 >: E](f: (E) ⇒ ZIO[RIn1, E1, Any]): ZLayer[RIn1, E1, ROut]
Performs the specified effect if this layer fails.
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final
def
to[E1 >: E, ROut2](that: ZLayer[ROut, E1, ROut2]): ZLayer[RIn, E1, ROut2]
A named alias for
>>>
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final
def
toRuntime(p: Platform)(implicit ev: <:<[Any, RIn]): Managed[E, Runtime[ROut]]
Converts a layer that requires no services into a managed runtime, which can be used to execute effects.
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def
toString(): String
- Definition Classes
- AnyRef → Any
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final
def
update[A](f: (A) ⇒ A)(implicit arg0: zio.Tag[A], ev1: IsHas[ROut], ev2: <:<[ROut, Has[A]]): ZLayer[RIn, E, ROut]
Updates one of the services output by this layer.
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final
def
wait(): Unit
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- @throws( ... )
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final
def
wait(arg0: Long, arg1: Int): Unit
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- @throws( ... )
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final
def
wait(arg0: Long): Unit
- Definition Classes
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- @throws( ... ) @native()
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final
def
zipPar[E1 >: E, RIn2, ROut2](that: ZLayer[RIn2, E1, ROut2]): ZLayer[RIn with RIn2, E1, (ROut, ROut2)]
Combines this layer with the specified layer, producing a new layer that has the inputs of both layers, and the outputs of both layers combined into a tuple.
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final
def
zipWithPar[E1 >: E, RIn2, ROut1 >: ROut, ROut2, ROut3](that: ZLayer[RIn2, E1, ROut2])(f: (ROut, ROut2) ⇒ ROut3): ZLayer[RIn with RIn2, E1, ROut3]
Combines this layer with the specified layer, producing a new layer that has the inputs of both layers, and the outputs of both layers combined using the specified function.