Packages

t

monix.eval

TaskApp

trait TaskApp extends AnyRef

Safe App type that executes a Task. Shutdown occurs after the Task completes, as follows:

- If completed with ExitCode.Success, the main method exits and shutdown is handled by the platform.

- If completed with any other ExitCode, sys.exit is called with the specified code.

- If the Task raises an error, the stack trace is printed to standard error and sys.exit(1) is called.

When a shutdown is requested via a signal, the Task is canceled and we wait for the IO to release any resources. The process exits with the numeric value of the signal plus 128.

import cats.effect._
import cats.implicits._
import monix.eval._

object MyApp extends TaskApp {
  def run(args: List[String]): Task[ExitCode] =
    args.headOption match {
      case Some(name) =>
        Task(println(s"Hello, \${name}.")).as(ExitCode.Success)
      case None =>
        Task(System.err.println("Usage: MyApp name")).as(ExitCode(2))
    }
}

N.B. this is homologous with cats.effect.IOApp, but meant for usage with Task.

Works on top of JavaScript as well ;-)

Source
TaskApp.scala
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Abstract Value Members

  1. abstract def run(args: List[String]): Task[ExitCode]

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. implicit lazy val catsEffect: ConcurrentEffect[Task]

    Provides the cats.effect.ConcurrentEffect instance of this runtime environment.

    Provides the cats.effect.ConcurrentEffect instance of this runtime environment.

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    protected
  6. def clone(): AnyRef
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  7. final def eq(arg0: AnyRef): Boolean
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  8. def equals(arg0: Any): Boolean
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  9. def finalize(): Unit
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  10. final def getClass(): Class[_]
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  11. def hashCode(): Int
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  12. final def isInstanceOf[T0]: Boolean
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  13. final def main(args: Array[String]): Unit
  14. final def ne(arg0: AnyRef): Boolean
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  15. final def notify(): Unit
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    @native()
  16. final def notifyAll(): Unit
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    @native()
  17. def options: Options

    Options for executing the Task action.

    Options for executing the Task action. The default value is defined in defaultOptions, but can be overridden.

    Attributes
    protected
  18. def scheduler: Scheduler

    Scheduler for executing the Task action.

    Scheduler for executing the Task action. Defaults to global, but can be overridden.

    Attributes
    protected
  19. final def synchronized[T0](arg0: ⇒ T0): T0
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  20. def toString(): String
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  21. final def wait(): Unit
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    @throws( ... )
  22. final def wait(arg0: Long, arg1: Int): Unit
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    @throws( ... )
  23. final def wait(arg0: Long): Unit
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