Futures

This trait is used to provide a non-blocking timeout on an operation that returns a Future.

Please note that the play.api.Application default ActorSystem should be used as input here, as the actorSystem.scheduler is responsible for scheduling the timeout, using akka.pattern.actor under the hood.

You can dependency inject the ActorSystem as follows to create a Future that will timeout after a certain period of time:

class MyService @Inject()(actorSystem: ActorSystem) extends Timeout {

  def calculateWithTimeout(timeoutDuration: FiniteDuration): Future[Int] = {
    timeout(actorSystem, timeoutDuration)(rawCalculation())
  }

  def rawCalculation(): Future[Int] = {
    import akka.pattern.after
    implicit val ec = actorSystem.dispatcher
    akka.pattern.after(300 millis, actorSystem.scheduler)(Future(42))(actorSystem.dispatcher)
  }
}

You should check for timeout by using scala.concurrent.Future.recover or scala.concurrent.Future.recoverWith and checking for scala.concurrent.TimeoutException:

val future = myService.calculateWithTimeout(100 millis).recover {
  case _: TimeoutException =>
    -1
}

Source: Futures.scala
See also: Futures and Promises

Linear Supertypes

AnyRef, Any

Known Subclasses

DefaultFutures

Abstract Value Members

abstract def delayed[A](duration: FiniteDuration)(f: Future[A]): Future[A]

Creates a future which will be completed after the specified duration.
Creates a future which will be completed after the specified duration.
A
the result type used in the Future.
duration
the duration to delay the future by.
f
the future to delay
abstract def timeout[A](timeoutDuration: FiniteDuration)(f: Future[A]): Future[A]

Creates a future which will resolve to a timeout exception if the given Future has not successfully completed within timeoutDuration.
Creates a future which will resolve to a timeout exception if the given Future has not successfully completed within timeoutDuration.
Note that timeout is not the same as cancellation. Even in case of timeout, the given future will still complete, even though that completed value is not returned.
A
the result type used in the Future.
timeoutDuration
the duration after which a Future.failed(TimeoutException) should be thrown.
f
a call by value Future[A]
returns
the future that completes first, either the failed future, or the operation.

Concrete Value Members

final def !=(arg0: Any): Boolean

Definition Classes
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final def ##(): Int

Definition Classes
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final def ==(arg0: Any): Boolean

Definition Classes
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final def asInstanceOf[T0]: T0

Definition Classes
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def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
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Annotations
@throws( ... )
final def eq(arg0: AnyRef): Boolean

Definition Classes
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def equals(arg0: Any): Boolean

Definition Classes
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def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
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Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
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def hashCode(): Int

Definition Classes
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final def isInstanceOf[T0]: Boolean

Definition Classes
Any
final def ne(arg0: AnyRef): Boolean

Definition Classes
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final def notify(): Unit

Definition Classes
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final def notifyAll(): Unit

Definition Classes
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final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
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def toString(): String

Definition Classes
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final def wait(): Unit

Definition Classes
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Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
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Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
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Annotations
@throws( ... )

Related Docs: object Futures | package concurrent

trait Futures extends AnyRef

Abstract Value Members

abstract def delayed[A](duration: FiniteDuration)(f: Future[A]): Future[A]

abstract def timeout[A](timeoutDuration: FiniteDuration)(f: Future[A]): Future[A]

Concrete Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

final def asInstanceOf[T0]: T0

def clone(): AnyRef

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

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

def toString(): String

final def wait(): Unit

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

final def wait(arg0: Long): Unit

Inherited from AnyRef

Inherited from Any

Ungrouped