sealed trait Stage[-In, +Out] extends AnyRef

General interface for stream transformation.

Custom Stage implementations are intended to be used with akka.stream.scaladsl.FlowOps#transform or akka.stream.javadsl.Flow#transform to extend the Flow API when there is no specialized operator that performs the transformation.

Custom implementations are subclasses of PushPullStage or DetachedStage. Sometimes it is convenient to extend StatefulStage for support of become like behavior.

It is possible to keep state in the concrete Stage instance with ordinary instance variables. The Transformer is executed by an actor and therefore you do not have to add any additional thread safety or memory visibility constructs to access the state from the callback methods.

Annotations
@deprecated
Deprecated

(Since version 2.4.2) Please use GraphStage instead.

Source
Stage.scala
See also

akka.stream.javadsl.Flow#transform

akka.stream.scaladsl.Flow#transform

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Inherited
  1. Stage
  2. AnyRef
  3. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from Stage[In, Out] to any2stringadd[Stage[In, Out]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (Stage[In, Out], B)
    Implicit
    This member is added by an implicit conversion from Stage[In, Out] to ArrowAssoc[Stage[In, Out]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  5. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  8. def ensuring(cond: (Stage[In, Out]) ⇒ Boolean, msg: ⇒ Any): Stage[In, Out]
    Implicit
    This member is added by an implicit conversion from Stage[In, Out] to Ensuring[Stage[In, Out]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  9. def ensuring(cond: (Stage[In, Out]) ⇒ Boolean): Stage[In, Out]
    Implicit
    This member is added by an implicit conversion from Stage[In, Out] to Ensuring[Stage[In, Out]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: Boolean, msg: ⇒ Any): Stage[In, Out]
    Implicit
    This member is added by an implicit conversion from Stage[In, Out] to Ensuring[Stage[In, Out]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean): Stage[In, Out]
    Implicit
    This member is added by an implicit conversion from Stage[In, Out] to Ensuring[Stage[In, Out]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  13. def equals(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  14. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  15. def formatted(fmtstr: String): String
    Implicit
    This member is added by an implicit conversion from Stage[In, Out] to StringFormat[Stage[In, Out]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  16. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  17. def hashCode(): Int
    Definition Classes
    AnyRef → Any
  18. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  19. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  20. final def notify(): Unit
    Definition Classes
    AnyRef
  21. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  22. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  23. def toString(): String
    Definition Classes
    AnyRef → Any
  24. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  25. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  26. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  27. def [B](y: B): (Stage[In, Out], B)
    Implicit
    This member is added by an implicit conversion from Stage[In, Out] to ArrowAssoc[Stage[In, Out]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from Stage[In, Out] to any2stringadd[Stage[In, Out]]

Inherited by implicit conversion StringFormat from Stage[In, Out] to StringFormat[Stage[In, Out]]

Inherited by implicit conversion Ensuring from Stage[In, Out] to Ensuring[Stage[In, Out]]

Inherited by implicit conversion ArrowAssoc from Stage[In, Out] to ArrowAssoc[Stage[In, Out]]

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