Created
February 14, 2020 06:34
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| import zio.{Promise, Ref, UIO, ZIO} | |
| trait CountDownLatch { | |
| def countDown: UIO[Unit] | |
| def await: UIO[Unit] | |
| } | |
| object CountDownLatch { | |
| def make(count: Int): UIO[CountDownLatch] = for { | |
| ready <- Promise.make[Nothing, Unit] | |
| ref <- Ref.make(count) | |
| } yield new CountDownLatch { | |
| override def countDown: UIO[Unit] = | |
| ref.update(_ - 1).flatMap { | |
| case 0 => ready.succeed(()).unit | |
| case _ => ZIO.unit | |
| } | |
| override def await: UIO[Unit] = ready.await | |
| } | |
| } |
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