Packages

sealed abstract class ZLayer[-RIn, +E, +ROut] extends AnyRef

A ZLayer[E, A, B] describes how to build one or more services in your application. Services can be injected into effects via ZIO#provide. Effects can require services via ZIO.service."

Layer can be thought of as recipes for producing bundles of services, given their dependencies (other services).

Construction of services 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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Value Members

  1. final def !(implicit ev1: <:<[E, Throwable], ev2: CanFail[E], trace: ZTraceElement): ZLayer[RIn, Nothing, ROut]

    A symbolic alias for orDie.

  2. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  3. final def ##(): Int
    Definition Classes
    AnyRef → Any
  4. final def +!+[E1 >: E, RIn2, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2]): ZLayer[RIn with RIn2, E1, ROut1 with ROut2]
  5. final def ++[E1 >: E, RIn2, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2])(implicit tag: zio.EnvironmentTag[ROut2]): ZLayer[RIn with RIn2, E1, ROut1 with ROut2]

    Combines this layer with the specified layer, producing a new layer that has the inputs and outputs of = both.

  6. def <>[RIn1 <: RIn, E1, ROut1 >: ROut](that: ZLayer[RIn1, E1, ROut1])(implicit ev: CanFail[E], trace: ZTraceElement): ZLayer[RIn1, E1, ROut1]

    A symbolic alias for orElse.

  7. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  8. final def and[E1 >: E, RIn2, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2])(implicit tag: zio.EnvironmentTag[ROut2]): ZLayer[RIn with RIn2, E1, ROut1 with ROut2]

    A named alias for ++.

  9. final def andTo[E1 >: E, RIn2 >: ROut, ROut1 >: ROut, ROut2](that: ZLayer[RIn2, E1, ROut2])(implicit tagged: zio.EnvironmentTag[ROut2], trace: ZTraceElement): ZLayer[RIn, E1, ROut1 with ROut2]

    A named alias for >+>.

  10. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  11. final def build(implicit trace: ZTraceElement): ZManaged[RIn, E, ZEnvironment[ROut]]

    Builds a layer into a managed value.

  12. final def catchAll[RIn1 <: RIn, E1, ROut1 >: ROut](handler: (E) ⇒ ZLayer[RIn1, E1, ROut1])(implicit trace: ZTraceElement): ZLayer[RIn1, E1, ROut1]

    Recovers from all errors.

  13. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  14. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  15. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  16. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  17. final def flatMap[RIn1 <: RIn, E1 >: E, ROut2](f: (ZEnvironment[ROut]) ⇒ ZLayer[RIn1, E1, ROut2])(implicit trace: ZTraceElement): ZLayer[RIn1, E1, ROut2]

    Constructs a layer dynamically based on the output of this layer.

  18. final def flatten[RIn1 <: RIn, E1 >: E, ROut1 >: ROut, ROut2](implicit tag: Tag[ROut1], ev1: <:<[ROut1, ZLayer[RIn1, E1, ROut2]], trace: ZTraceElement): ZLayer[RIn1, E1, ROut2]
  19. final def foldCauseLayer[E1, RIn1 <: RIn, ROut2](failure: (Cause[E]) ⇒ ZLayer[RIn1, E1, ROut2], success: (ZEnvironment[ROut]) ⇒ ZLayer[RIn1, 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 or success layers, resulting in a new layer with the inputs of this layer, and the error or outputs of the specified layer.

  20. final def foldLayer[E1, RIn1 <: RIn, ROut2](failure: (E) ⇒ ZLayer[RIn1, E1, ROut2], success: (ZEnvironment[ROut]) ⇒ ZLayer[RIn1, E1, ROut2])(implicit ev: CanFail[E], trace: ZTraceElement): ZLayer[RIn1, E1, ROut2]

    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 the inputs of this layer, and the error or outputs of the specified layer.

  21. final def fresh: ZLayer[RIn, E, ROut]

    Creates a fresh version of this layer that will not be shared.

  22. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  23. final lazy val hashCode: Int

    Returns the hash code of this layer.

    Returns the hash code of this layer.

    Definition Classes
    ZLayer → AnyRef → Any
  24. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  25. final def launch(implicit trace: ZTraceElement): ZIO[RIn, 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.

  26. final def map[ROut1](f: (ZEnvironment[ROut]) ⇒ ZEnvironment[ROut1])(implicit trace: ZTraceElement): ZLayer[RIn, E, ROut1]

    Returns a new layer whose output is mapped by the specified function.

  27. final def mapError[E1](f: (E) ⇒ E1)(implicit ev: CanFail[E], trace: ZTraceElement): ZLayer[RIn, E1, ROut]

    Returns a layer with its error channel mapped using the specified function.

  28. final def memoize(implicit trace: ZTraceElement): ZManaged[Any, Nothing, ZLayer[RIn, E, ROut]]

    Returns a managed effect that, if evaluated, will return the lazily computed result of this layer.

  29. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  30. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  31. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  32. final def orDie(implicit ev1: IsSubtypeOfError[E, Throwable], ev2: CanFail[E], trace: ZTraceElement): 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.

  33. final def orElse[RIn1 <: RIn, E1, ROut1 >: ROut](that: ZLayer[RIn1, E1, ROut1])(implicit ev: CanFail[E], trace: ZTraceElement): ZLayer[RIn1, E1, ROut1]

    Executes this layer and returns its output, if it succeeds, but otherwise executes the specified layer.

  34. final def retry[RIn1 <: RIn with Clock](schedule: Schedule[RIn1, E, Any])(implicit trace: ZTraceElement): ZLayer[RIn1, E, ROut]

    Retries constructing this layer according to the specified schedule.

  35. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  36. final def tap[RIn1 <: RIn, E1 >: E](f: (ZEnvironment[ROut]) ⇒ ZIO[RIn1, E1, Any])(implicit trace: ZTraceElement): ZLayer[RIn1, E1, ROut]

    Performs the specified effect if this layer succeeds.

  37. final def tapError[RIn1 <: RIn, E1 >: E](f: (E) ⇒ ZIO[RIn1, E1, Any])(implicit trace: ZTraceElement): ZLayer[RIn1, E1, ROut]

    Performs the specified effect if this layer fails.

  38. final def to[E1 >: E, ROut2](that: ZLayer[ROut, E1, ROut2])(implicit trace: ZTraceElement): ZLayer[RIn, E1, ROut2]

    A named alias for >>>.

  39. final def toRuntime(runtimeConfig: RuntimeConfig)(implicit ev: <:<[Any, RIn], trace: ZTraceElement): Managed[E, Runtime[ROut]]

    Converts a layer that requires no services into a managed runtime, which can be used to execute effects.

  40. def toString(): String
    Definition Classes
    AnyRef → Any
  41. final def update[A >: ROut](f: (A) ⇒ A)(implicit arg0: Tag[A], trace: ZTraceElement): ZLayer[RIn, E, ROut]

    Updates one of the services output by this layer.

  42. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  43. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  44. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... ) @native()
  45. final def zipWithPar[E1 >: E, RIn2, ROut1 >: ROut, ROut2, ROut3](that: ZLayer[RIn2, E1, ROut2])(f: (ZEnvironment[ROut], ZEnvironment[ROut2]) ⇒ ZEnvironment[ROut3]): ZLayer[RIn with RIn2, E1, ROut3]

    Combines this layer the specified layer, producing a new layer that has the inputs of both, and the outputs of both combined using the specified function.

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