PublisherOps

Value parameters

chunkSize

setup the number of elements asked each time from the Publisher. A high number may be useful if the publisher is triggering from IO, like requesting elements from a database. A high number will also lead to more elements in memory. The stream will not emit new element until, either the Chunk is filled or the publisher finishes.

Attributes

Note

The Publisher will not receive a Subscriber until the stream is run.

Example

scala> import cats.effect.IO
scala> import fs2.Stream
scala> import fs2.interop.flow.syntax._
scala> import java.util.concurrent.Flow.Publisher
scala>
scala> def getThirdPartyPublisher(): Publisher[Int] = ???
scala>
scala> // Interop with the third party library.
scala> Stream.eval(IO.delay(getThirdPartyPublisher())).flatMap { publisher =>
    |   publisher.toStream[IO](chunkSize = 16)
    | }
res0: Stream[IO, Int] = Stream(..)

Source

syntax.scala