Trait

scalaz.zio

App

Related Doc: package zio

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trait App extends RTS

The entry point for a purely-functional application on the JVM.

import java.io.IOException
import scalaz.zio.{App, IO}
import scalaz.zio.console._

object MyApp extends App {

  def run(args: List[String]): IO[Nothing, ExitStatus] =
    myAppLogic.attempt.map(_.fold(_ => 1, _ => 0)).map(ExitStatus.ExitNow(_))

  def myAppLogic: IO[IOException, Unit] =
    for {
      _ <- putStrLn("Hello! What is your name?")
      n <- getStrLn
      _ <- putStrLn("Hello, " + n + ", good to meet you!")
    } yield ()
}
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Type Members

  1. sealed abstract class ExitStatus extends Serializable with Product

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Abstract Value Members

  1. abstract def run(args: List[String]): IO[Nothing, ExitStatus]

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    The main function of the application, which will be passed the command-line arguments to the program and has to return an IO with the errors fully handled.

Concrete Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. object ExitStatus extends Serializable

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  5. val YieldMaxOpCount: Int

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    Determines the maximum number of operations executed by a fiber before yielding to other fibers.

    Determines the maximum number of operations executed by a fiber before yielding to other fibers.

    FIXME: Replace this entirely with the new scheme.

    Definition Classes
    RTS

  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

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    Attributes
    protected[java.lang]
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    Annotations
    @throws( ... )

  8. def defaultHandler: (Cause[Any]) ⇒ IO[Nothing, Unit]

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    The default handler for unhandled exceptions in the main fiber, and any fibers it forks that recursively inherit the handler.

    The default handler for unhandled exceptions in the main fiber, and any fibers it forks that recursively inherit the handler.

    Definition Classes
    RTS

  9. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  10. def equals(arg0: Any): Boolean

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  11. def finalize(): Unit

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    Attributes
    protected[java.lang]
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    @throws( classOf[java.lang.Throwable] )

  12. final def getClass(): Class[_]

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  13. def hashCode(): Int

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  14. final def isInstanceOf[T0]: Boolean

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  15. final def main(args0: Array[String]): Unit

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    The Scala main function, intended to be called only by the Scala runtime.

  16. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  17. def nonFatal(t: Throwable): Boolean

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    Utility function to avoid catching truly fatal exceptions.

    Utility function to avoid catching truly fatal exceptions. Do not allocate memory here since this would defeat the point of checking for OOME.

    Attributes
    protected
    Definition Classes
    RTS

  18. final def notify(): Unit

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    Definition Classes
    AnyRef

  19. final def notifyAll(): Unit

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  20. final def schedule[E, A](block: ⇒ A, duration: Duration): Async[E, Unit]

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    Definition Classes
    RTS

  21. lazy val scheduledExecutor: ScheduledExecutorService

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    The thread pool for scheduling timed tasks.

    The thread pool for scheduling timed tasks.

    Definition Classes
    RTS

  22. final def submit[A](block: ⇒ A): Unit

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    Definition Classes
    RTS

  23. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
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  24. val threadPool: ExecutorService

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    The main thread pool used for executing fibers.

    The main thread pool used for executing fibers.

    Definition Classes
    RTS

  25. def toString(): String

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    Definition Classes
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  26. final def unsafeRun[E, A](io: IO[E, A]): A

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    Effectfully and synchronously interprets an IO[E, A], either throwing an error, running forever, or producing an A.

    Effectfully and synchronously interprets an IO[E, A], either throwing an error, running forever, or producing an A.

    Definition Classes
    RTS

  27. final def unsafeRunAsync[E, A](io: IO[E, A])(k: Callback[E, A]): Unit

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    Definition Classes
    RTS

  28. final def unsafeRunSync[E, A](io: IO[E, A]): ExitResult[E, A]

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    Effectfully interprets an IO, blocking if necessary to obtain the result.

    Effectfully interprets an IO, blocking if necessary to obtain the result.

    Definition Classes
    RTS

  29. final def unsafeShutdownAndWait(timeout: Duration): Unit

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    Definition Classes
    RTS

  30. final def wait(): Unit

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    Annotations
    @throws( ... )

  31. final def wait(arg0: Long, arg1: Int): Unit

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    Annotations
    @throws( ... )

  32. final def wait(arg0: Long): Unit

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    Definition Classes
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    Annotations
    @throws( ... )

Inherited from RTS

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