Package

play.api.libs

concurrent

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package concurrent

Visibility
  1. Public
  2. All

Type Members

  1. class ActorRefProvider[T <: Actor] extends Provider[ActorRef]

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    Provider for creating actor refs

  2. class ActorSystemProvider extends Provider[ActorSystem]

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    Provider for the actor system

    Provider for the actor system

    Annotations
    @Singleton()
  3. trait AkkaComponents extends AnyRef

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    Components for configuring Akka.

  4. trait AkkaGuiceSupport extends AnyRef

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    Support for binding actors with Guice.

    Support for binding actors with Guice.

    Mix this trait in with a Guice AbstractModule to get convenient support for binding actors. For example:

    class MyModule extends AbstractModule with AkkaGuiceSupport {
      def configure = {
        bindActor[MyActor]("myActor")
      }
    }

    Then to use the above actor in your application, add a qualified injected dependency, like so:

    class MyController @Inject() (@Named("myActor") myActor: ActorRef, val controllerComponents: ControllerComponents)
        extends BaseController {
      ...
    }
  5. abstract class CustomExecutionContext extends ExecutionContextExecutor

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    This class defines a custom execution context that delegates to an akka.actor.ActorSystem.

    This class defines a custom execution context that delegates to an akka.actor.ActorSystem.

    It is very useful for situations in which the default execution context should not be used, for example if a database or blocking I/O is being used.

    To define a custom context, subclass CustomExecutionContext with the dispatcher name:

    @Singleton
    class DatabaseExecutionContext @Inject()(system: ActorSystem)
       extends CustomExecutionContext(system, "database-dispatcher")

    and then bind it in dependency injection:

    bind[DatabaseExecutionContext].to(classOf[DatabaseExecutionContext]).asEagerSingleton()

    Then have the execution context passed in as an implicit parameter:

    class DatabaseService @Inject()(implicit executionContext: DatabaseExecutionContext) {
      ...
    }
    See also

    Thread Pools

    Dispatchers

  6. class DefaultFutures extends Futures

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    ActorSystem based timeout.

  7. class ExecutionContextProvider extends Provider[ExecutionContextExecutor]

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    Provider for the default execution context

    Provider for the default execution context

    Annotations
    @Singleton()
  8. trait Futures extends AnyRef

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

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

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

    class MyService @Inject()(futures: Futures, piCalculator: PiCalculator) extends Timeout {
      def calculateWithTimeout(timeoutDuration: FiniteDuration): Future[Int] = {
        futures.timeout(timeoutDuration)(piCalculator.rawCalculation())
      }
    }

    And you can also use a delay to return data after a given period of time.

    class PiCalculator @Inject()(futures: Futures) {
      def rawCalculation(): Future[Int] = {
        futures.delay(300 millis) { Future.successful(42) }
      }
    }

    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
    }
    See also

    Futures and Promises

  9. trait InjectedActorSupport extends AnyRef

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    Support for creating injected child actors.

  10. trait LowPriorityFuturesImplicits extends AnyRef

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    Low priority implicits to add withTimeout methods to scala.concurrent.Future.

    Low priority implicits to add withTimeout methods to scala.concurrent.Future.

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

    class MyService @Inject()(piCalculator: PiCalculator)(implicit futures: Futures) {
    
      def calculateWithTimeout(timeoutDuration: FiniteDuration): Future[Int] = {
         piCalculator.rawCalculation().withTimeout(timeoutDuration)
      }
    }

    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
    }
  11. class MaterializerProvider extends Provider[Materializer]

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    Provider for the default flow materializer

    Provider for the default flow materializer

    Annotations
    @Singleton()
  12. trait Timeout extends AnyRef

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

    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(val 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 Future.recover() or Future.recoverWith() and checking for TimeoutException:

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

    (Since version 2.6.0) Use play.api.libs.concurrent.Futures.timeout

    See also

    Futures and Promises

Value Members

  1. object ActorSystemProvider

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  2. object Akka

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    Helper to access the application defined Akka Actor system.

  3. object Futures extends LowPriorityFuturesImplicits

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Deprecated Value Members

  1. object Execution

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    Annotations
    @deprecated
    Deprecated

    (Since version 2.6.0) Please see https://www.playframework.com/documentation/2.6.x/Migration26#play.api.libs.concurrent.Execution-is-deprecated

  2. object Timeout extends Timeout with LowPriorityFuturesImplicits

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    This is a static object that can be used to import timeout implicits, as a convenience.

    This is a static object that can be used to import timeout implicits, as a convenience.

    import play.api.libs.concurrent.Timeout._
    Annotations
    @deprecated
    Deprecated

    (Since version 2.6.0) Use play.api.libs.concurrent.Futures

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