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h8io.stages.operators

KeepLastOutput

object KeepLastOutput

A decorator that remembers the last output produced by the inner stage and re-emits it when the inner stage yields no value.

The decorator has two internal states:

  • **None state** (initial): no output has been seen yet. The inner stage's h8io.stages.Yield.None is forwarded unchanged; a h8io.stages.Yield.Some is forwarded and transitions the wrapper to the Some state.
  • **Some state**: a previous output out is remembered, so the wrapper always emits a value. A new h8io.stages.Yield.Some from the inner stage is forwarded as is and updates the remembered value; on h8io.stages.Yield.None the remembered value is emitted instead.

In both states the evolution is mapped so that continuations remain wrapped in the appropriate KeepLastOutput variant, preserving the last-value semantics.

Both variants are internal to the package: the decorator is reached through the KeepLastOutput.apply factory, which always starts in the None state, and the state it is in afterwards is not part of the API.

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  4. def apply[I, O, E](stage: Stage[I, O, E]): Stage[I, O, E]

    Wraps stage in a KeepLastOutput starting in the initial (no remembered value) state.

    Wraps stage in a KeepLastOutput starting in the initial (no remembered value) state.

    I

    the input type

    O

    the output type

    E

    the error type

    stage

    the stage to wrap

    returns

    a stage that re-emits the last seen output when the inner stage yields nothing

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