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Test with Scala Cats IO
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| import java.time.Instant | |
| import java.util.concurrent.Executors | |
| import cats.effect._ | |
| import cats.syntax.all._ | |
| import scala.concurrent.duration._ | |
| import scala.concurrent.{ExecutionContext, ExecutionContextExecutor} | |
| import scala.util.{Failure, Success} | |
| object IOMain { | |
| private val exBlockingFileIO = ExecutionContext.fromExecutor(Executors.newCachedThreadPool()) | |
| private val exMain: ExecutionContextExecutor = ExecutionContext.global | |
| implicit val csMain: ContextShift[IO] = IO.contextShift(exMain) | |
| // Needed for `IO.sleep` | |
| implicit val timer: Timer[IO] = IO.timer(exMain) | |
| def task(): IO[Unit] = | |
| for { | |
| _ <- IO(println(s"${Instant.now()} - start task!")) | |
| _ <- IO.sleep(2.second) | |
| _ <- IO(println(s"${Instant.now()} - finished task!")) | |
| } yield () | |
| def program(args: List[String]): IO[Unit] = | |
| for { | |
| _ <- IO(println(s"${Instant.now()} - Sleep!")) | |
| fiber <- task().start | |
| _ <- IO(println(s"${Instant.now()} - Wake up!")) | |
| result <- IO.pure(fiber) | |
| } yield result | |
| def main(args: Array[String]): Unit = | |
| program(args.toList) | |
| .unsafeToFuture() | |
| .onComplete { | |
| case Failure(_) => println(s"${Instant.now()} - ERROR!") | |
| case Success(_) => println(s"${Instant.now()} - OK!") | |
| }(exMain) | |
| def run(args: List[String]): IO[ExitCode] = | |
| program(args).as(ExitCode.Success) | |
| def mai2(args: Array[String]): Unit = | |
| run(args.toList).runAsync(_ => IO(())).unsafeRunSync() | |
| } |
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