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Join FiberRefs In Order In ZipPar #8216

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Merged
merged 1 commit into from
Jul 14, 2023
Merged

Join FiberRefs In Order In ZipPar #8216

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10 changes: 10 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 @@ -4193,6 +4193,16 @@ object ZIOSpec extends ZIOBaseSpec {
test("propagates interruption") {
val zio = ZIO.never <&> ZIO.never <&> ZIO.fail("fail")
assertZIO(zio.exit)(fails(equalTo("fail")))
},
test("propagates FiberRef values") {
for {
fiberRef <- FiberRef.make(5)
workflow = fiberRef.set(10).delay(2.seconds) <&> fiberRef.set(15)
fiber <- workflow.fork
_ <- TestClock.adjust(2.seconds)
_ <- fiber.join
value <- fiberRef.get
} yield assertTrue(value == 10)
}
),
suite("toFuture")(
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12 changes: 7 additions & 5 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 @@ -2521,24 +2521,24 @@ sealed trait ZIO[-R, +E, +A]
)(f: (A, B) => C)(implicit trace: Trace): ZIO[R1, E1, C] =
ZIO.uninterruptibleMask { restore =>
ZIO.transplant { graft =>
val promise = Promise.unsafe.make[Unit, Unit](FiberId.None)(Unsafe.unsafe)
val promise = Promise.unsafe.make[Unit, Boolean](FiberId.None)(Unsafe.unsafe)
val ref = new java.util.concurrent.atomic.AtomicBoolean(false)

def fork[R, E, A](zio: => ZIO[R, E, A]): ZIO[R, Nothing, Fiber[E, A]] =
def fork[R, E, A](zio: => ZIO[R, E, A], side: Boolean): ZIO[R, Nothing, Fiber[E, A]] =
graft(restore(zio))
.foldCauseZIO(
cause => promise.fail(()) *> ZIO.refailCause(cause),
a =>
if (ref.getAndSet(true)) {
promise.unsafe.done(ZIO.unit)(Unsafe.unsafe)
promise.unsafe.done(ZIO.succeedNow(side))(Unsafe.unsafe)
ZIO.succeed(a)
} else {
ZIO.succeed(a)
}
)
.forkDaemon

fork(self).zip(fork(that)).flatMap { case (left, right) =>
fork(self, false).zip(fork(that, true)).flatMap { case (left, right) =>
restore(promise.await).foldCauseZIO(
cause =>
left.interruptFork *> right.interruptFork *>
Expand All @@ -2548,7 +2548,9 @@ sealed trait ZIO[-R, +E, +A]
case _ => ZIO.refailCause(cause.stripFailures)
}
},
_ => left.join.zipWith(right.join)(f)
leftWins =>
if (leftWins) left.join.zipWith(right.join)((a, b) => f(a, b))
else right.join.zipWith(left.join)((b, a) => f(a, b))
)
}
}
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