Package org.apache.spark

Interface FutureAction<T>

All Superinterfaces:
scala.concurrent.Awaitable<T>, scala.concurrent.Future<T>
All Known Implementing Classes:
ComplexFutureAction, SimpleFutureAction
public interface FutureAction<T> extends scala.concurrent.Future<T>
A future for the result of an action to support cancellation. This is an extension of the Scala Future interface to support cancellation.

  • Nested Class Summary

    Nested classes/interfaces inherited from interface scala.concurrent.Future

    scala.concurrent.Future.never$

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    cancel()
    Cancels the execution of this action.
    T
    get()
    Blocks and returns the result of this job.
    boolean
    isCancelled()
    Returns whether the action has been cancelled.
    boolean
    isCompleted()
    Returns whether the action has already been completed with a value or an exception.
    scala.collection.immutable.Seq<Object>
    jobIds()
    Returns the job IDs run by the underlying async operation.
    <U> void
    onComplete(scala.Function1<scala.util.Try<T>,U> func, scala.concurrent.ExecutionContext executor)
    When this action is completed, either through an exception, or a value, applies the provided function.
    FutureAction<T>
    ready(scala.concurrent.duration.Duration atMost, scala.concurrent.CanAwait permit)
    Blocks until this action completes.
    T
    result(scala.concurrent.duration.Duration atMost, scala.concurrent.CanAwait permit)
    Awaits and returns the result (of type T) of this action.
    scala.Option<scala.util.Try<T>>
    value()
    The value of this Future.

    Methods inherited from interface scala.concurrent.Future

    andThen, collect, failed, fallbackTo, filter, flatMap, flatten, foreach, map, mapTo, recover, recoverWith, transform, transform, transformWith, withFilter, zip, zipWith

  • Method Details

    • cancel

      void cancel()
      Cancels the execution of this action.

    • get

      T get() throws SparkException
      Blocks and returns the result of this job.
      Returns:
      (undocumented)
      Throws:
      SparkException

    • isCancelled

      boolean isCancelled()
      Returns whether the action has been cancelled.
      Returns:
      (undocumented)

    • isCompleted

      boolean isCompleted()
      Returns whether the action has already been completed with a value or an exception.
      Specified by:
      isCompleted in interface scala.concurrent.Future<T>
      Returns:
      (undocumented)

    • jobIds

      scala.collection.immutable.Seq<Object> jobIds()
      Returns the job IDs run by the underlying async operation.

      This returns the current snapshot of the job list. Certain operations may run multiple jobs, so multiple calls to this method may return different lists.

      Returns:
      (undocumented)

    • onComplete

      <U> void onComplete(scala.Function1<scala.util.Try<T>,U> func, scala.concurrent.ExecutionContext executor)
      When this action is completed, either through an exception, or a value, applies the provided function.
      Specified by:
      onComplete in interface scala.concurrent.Future<T>
      Parameters:
      func - (undocumented)
      executor - (undocumented)

    • ready

      FutureAction<T> ready(scala.concurrent.duration.Duration atMost, scala.concurrent.CanAwait permit)
      Blocks until this action completes.

      Specified by:
      ready in interface scala.concurrent.Awaitable<T>
      Parameters:
      atMost - maximum wait time, which may be negative (no waiting is done), Duration.Inf for unbounded waiting, or a finite positive duration
      permit - (undocumented)
      Returns:
      this FutureAction

    • result

      T result(scala.concurrent.duration.Duration atMost, scala.concurrent.CanAwait permit) throws Exception
      Awaits and returns the result (of type T) of this action.

      Specified by:
      result in interface scala.concurrent.Awaitable<T>
      Parameters:
      atMost - maximum wait time, which may be negative (no waiting is done), Duration.Inf for unbounded waiting, or a finite positive duration
      permit - (undocumented)
      Returns:
      the result value if the action is completed within the specific maximum wait time
      Throws:
      Exception - exception during action execution

    • value

      scala.Option<scala.util.Try<T>> value()
      The value of this Future.

      If the future is not completed the returned value will be None. If the future is completed the value will be Some(Success(t)) if it contains a valid result, or Some(Failure(error)) if it contains an exception.

      Specified by:
      value in interface scala.concurrent.Future<T>
      Returns:
      (undocumented)