final case class None[-I, +O, +E](status: Status[E], evolution: Evolution[I, O, E]) extends Yield[I, O, E] with Product with Serializable
A Yield that carries no output value.
This can occur when a stage decides not to emit a value for the current input (e.g. a filter stage that drops items). The pipeline still carries a Status and an Evolution so that processing can resume or terminate correctly.
When composing inside a Stage.AndThen, a None from the first stage is forwarded without invoking the second
stage; instead, the second stage is wired into the evolution so that it will be applied when the pipeline
eventually resumes.
- I
the input type for the evolution stages (contravariant)
- O
the (phantom) output type (covariant)
- E
the error type (covariant)
- status
the execution status
- evolution
the evolution strategy for re-processing
- Source
- Yield.scala
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- val evolution: Evolution[I, O, E]
The evolution strategy that determines which stage to invoke next, depending on status.
- def evolve(): Stage[I, O, E]
Returns the next Stage to invoke when the pipeline is ready to re-process.
Returns the next Stage to invoke when the pipeline is ready to re-process.
The stage returned depends on the current status: Status.Success yields the continuation for the normal path, Status.Complete for the finished path.
- returns
the next
Stageto use for re-processing
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- def map[_I, _O, _E](mapOut: (O) => _O, mapStatus: (Status[E]) => Status[_E], mapEvolution: (Evolution[I, O, E]) => Evolution[_I, _O, _E]): Yield[_I, _O, _E]
Returns a new
Yieldwith each component independently transformed.Returns a new
Yieldwith each component independently transformed.- _I
the new input type for the evolution
- _O
the new output type
- _E
the new error type
- mapOut
maps the output value (only applied in Yield.Some)
- mapStatus
maps the status
- mapEvolution
maps the evolution
- returns
a transformed
Yield
- final def ne(arg0: AnyRef): Boolean
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- def outOption: Option[O]
Returns
scala.Some(out)if this is a Yield.Some, orscala.Noneif this is a Yield.None.Returns
scala.Some(out)if this is a Yield.Some, orscala.Noneif this is a Yield.None.Prefer pattern-matching on Yield.Some / Yield.None when you also need the
statusorevolution. UseoutOptionwhen you only care about whether a value was produced. - def productElementNames: Iterator[String]
- Definition Classes
- Product
- val status: Status[E]
The status produced by the stage that created this
Yield. - final def synchronized[T0](arg0: => T0): T0
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- @throws(classOf[java.lang.Throwable]) @Deprecated
- Deprecated
(Since version 9)