monix.eval.TaskApp.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) 2014-2016 by its authors. Some rights reserved.
 * See the project homepage at: https://monix.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package monix.eval

import monix.execution.Scheduler
import scala.concurrent.Await
import scala.concurrent.duration.Duration

/** Safe `App` type that runs a [[Task]] action.
  *
  * Clients should implement `run`, `runl`, or `runc`.
  *
  * Also available for Scala.js, but without the ability
  * to take arguments and without the blocking in main.
  */
trait TaskApp {
  def run(args: Array[String]): Task[Unit] =
    runl(args.toList)

  def runl(args: List[String]): Task[Unit] =
    runc

  def runc: Task[Unit] =
    Task.now(())

  /** Scheduler for executing the [[Task]] action.
    * Defaults to `global`, but can be overridden.
    */
  protected val scheduler: Coeval[Scheduler] =
    Coeval.evalOnce(monix.execution.Scheduler.global)

  final def main(args: Array[String]): Unit = {
    val f = run(args).runAsync(scheduler.value)
    Await.result(f, Duration.Inf)
  }
}