Packages

c

fs2.Stream

InvariantOps

final class InvariantOps[F[_], O] extends AnyVal

Provides syntax for streams that are invariant in F and O.

Source
Stream.scala
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AnyVal, Any
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Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    Any
  2. final def ##: Int
    Definition Classes
    Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def covary[F2[x] >: F[x]]: Stream[F2, O]

    Lifts this stream to the specified effect type.

    Lifts this stream to the specified effect type.

    Example:
    1. scala> import cats.effect.IO
      scala> Stream(1, 2, 3).covary[IO]
      res0: Stream[IO,Int] = Stream(..)
  6. def getClass(): Class[_ <: AnyVal]
    Definition Classes
    AnyVal → Any
  7. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  8. def observe(p: Pipe[F, O, Unit])(implicit F: Concurrent[F]): Stream[F, O]

    Synchronously sends values through p.

    Synchronously sends values through p.

    If p fails, then resulting stream will fail. If p halts the evaluation will halt too.

    Note that observe will only output full chunks of O that are known to be successfully processed by p. So if p terminates/fails in the middle of chunk processing, the chunk will not be available in resulting stream.

    Note that if your pipe can be represented by an O => F[Unit], evalTap will provide much greater performance.

    Example:
    1. scala> import cats.effect.{ContextShift, IO}
      scala> implicit val cs: ContextShift[IO] = IO.contextShift(scala.concurrent.ExecutionContext.Implicits.global)
      scala> Stream(1, 2, 3).covary[IO].observe(_.showLinesStdOut).map(_ + 1).compile.toVector.unsafeRunSync()
      res0: Vector[Int] = Vector(2, 3, 4)
  9. def observeAsync(maxQueued: Int)(p: Pipe[F, O, Unit])(implicit F: Concurrent[F]): Stream[F, O]

    Send chunks through p, allowing up to maxQueued pending _chunks_ before blocking s.

  10. def observeEither[L, R](left: Pipe[F, L, Unit], right: Pipe[F, R, Unit])(implicit F: Concurrent[F], ev: <:<[O, Either[L, R]]): Stream[F, Either[L, R]]

    Observes this stream of Either[L, R] values with two pipes, one that observes left values and another that observes right values.

    Observes this stream of Either[L, R] values with two pipes, one that observes left values and another that observes right values.

    If either of left or right fails, then resulting stream will fail. If either halts the evaluation will halt too.

  11. def pull: ToPull[F, O]

    Gets a projection of this stream that allows converting it to a Pull in a number of ways.

  12. def repeatPull[O2](f: (ToPull[F, O]) => Pull[F, O2, Option[Stream[F, O]]]): Stream[F, O2]

    Repeatedly invokes using, running the resultant Pull each time, halting when a pull returns None instead of Some(nextStream).

  13. def toString(): String
    Definition Classes
    Any

Inherited from AnyVal

Inherited from Any

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