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Merged
merged 4 commits into from
Mar 4, 2022
Merged

Add ZIO.raceFirst #6402

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993e6da
Add receAllFirst
cipriansofronia Mar 4, 2022
b90c9b9
Update docs
cipriansofronia Mar 4, 2022
6b25485
Move raceFirst to ZIO companion
cipriansofronia Mar 4, 2022
9249fbd
Update doc
cipriansofronia Mar 4, 2022
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22 changes: 22 additions & 0 deletions core-tests/shared/src/test/scala/zio/ZIOSpec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -2671,6 +2671,28 @@ object ZIOSpec extends ZIOBaseSpec {
b <- effect.await
} yield assert(b)(equalTo(42))
} @@ zioTag(interruption),
testM("raceAllFirst interrupts losers on success") {
for {
s <- Promise.make[Nothing, Unit]
effect <- Promise.make[Nothing, Int]
winner = s.await *> IO.fromEither(Right(()))
losers = List(ZIO.bracket(s.succeed(()))(_ => effect.succeed(42))(_ => ZIO.infinity))
race = ZIO.raceFirst(winner, losers)
_ <- race
b <- effect.await
} yield assert(b)(equalTo(42))
} @@ zioTag(interruption),
testM("raceAllFirst interrupts losers on failure") {
for {
s <- Promise.make[Nothing, Unit]
effect <- Promise.make[Nothing, Int]
winner = s.await *> IO.fromEither(Left(new Exception))
losers = List(ZIO.bracket(s.succeed(()))(_ => effect.succeed(42))(_ => ZIO.infinity))
race = ZIO.raceFirst(winner, losers)
_ <- race.either
b <- effect.await
} yield assert(b)(equalTo(42))
} @@ zioTag(interruption),
testM("mergeAll") {
val io = IO.mergeAll(List("a", "aa", "aaa", "aaaa").map(IO.succeed[String](_)))(0)((b, a) => b + a.length)

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15 changes: 15 additions & 0 deletions core/shared/src/main/scala/zio/ZIO.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3884,6 +3884,21 @@ object ZIO extends ZIOCompanionPlatformSpecific {
): ZIO[R1, E, A] =
zio.raceAll(ios)

/**
* Returns an effect that races this effect with all the specified effects,
* yielding the first result to complete, whether by success or failure. If
* neither effect completes, then the composed effect will not complete.
*
* WARNING: The raced effect will safely interrupt the "losers", but will not
* resume until the losers have been cleanly terminated. If early return is
* desired, then instead of performing `ZIO.raceFirst(l, rs)`, perform
* `ZIO.raceFirst(l.disconnect, rs.map(_.disconnect))`, which disconnects left
* and rights interrupt signal, allowing a fast return, with interruption
* performed in the background.
*/
def raceFirst[R, R1 <: R, E, A](zio: ZIO[R, E, A], ios: Iterable[ZIO[R1, E, A]]): ZIO[R1, E, A] =
(zio.run raceAll ios.map(_.run)).flatMap(ZIO.done(_)).refailWithTrace

/**
* Reduces an `Iterable[IO]` to a single `IO`, working sequentially.
*/
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