org.eclipse.microprofile.reactive.streams.operators.spi

## Interface Stage.FindFirst

All Superinterfaces:
  Stage

Enclosing interface:
  Stage

    public static interface Stage.FindFirst
    extends Stage

A subscriber stage that emits the first element encountered.

When built, the `CompletionStage` must emit an `Optional` of the first element encountered. If no element is emitted before completion of the stream, it must emit an empty optional. Once the element has been emitted, the stream must be cancelled if not already complete.

If an error is emitted before the first element is encountered, the stream must redeem the completion stage with that error.

### Nested Class Summary

### Nested classes/interfaces inherited from interface org.eclipse.microprofile.reactive.streams.operators.spi.Stage

`Stage.Cancel, Stage.Collect, Stage.Concat, Stage.Coupled, Stage.Distinct, Stage.DropWhile, Stage.Failed, Stage.Filter, Stage.FindFirst, Stage.FlatMap, Stage.FlatMapCompletionStage, Stage.FlatMapIterable, Stage.FromCompletionStage, Stage.FromCompletionStageNullable, Stage.Limit, Stage.Map, Stage.Of, Stage.OnComplete, Stage.OnError, Stage.OnErrorResume, Stage.OnErrorResumeWith, Stage.OnTerminate, Stage.Peek, Stage.ProcessorStage, Stage.PublisherStage, Stage.Skip, Stage.SubscriberStage, Stage.TakeWhile`