akka.dispatch

Filter

object Filter

Java API (not recommended): Callback for the Future.filter operation that creates a new Future which will conditionally contain the success of another Future.

Unfortunately it is not possible to express the type of a Scala filter in Java: Function1[T, Boolean], where “Boolean” is the primitive type. It is possible to use Future.filter by constructing such a function indirectly:

import static akka.dispatch.Filter.filterOf;
Future<String> f = ...;
f.filter(filterOf(new Function<String, Boolean>() {
  @Override
  public Boolean apply(String s) {
    ...
  }
}));

However, Future.filter exists mainly to support Scala’s for-comprehensions, thus Java users should prefer Future.map, translating non-matching values to failure cases.

Source
Future.scala
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  1. final def !=(arg0: AnyRef): Boolean

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  2. final def !=(arg0: Any): Boolean

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  3. final def ##(): Int

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  4. final def ==(arg0: AnyRef): Boolean

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  5. final def ==(arg0: Any): Boolean

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  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

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  8. final def eq(arg0: AnyRef): Boolean

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  9. def equals(arg0: Any): Boolean

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  10. def filterOf[T](f: Function[T, Boolean]): (T) ⇒ Boolean

  11. def finalize(): Unit

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  12. final def getClass(): Class[_]

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  13. def hashCode(): Int

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  14. final def isInstanceOf[T0]: Boolean

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  15. final def ne(arg0: AnyRef): Boolean

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  16. final def notify(): Unit

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  17. final def notifyAll(): Unit

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

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  19. def toString(): String

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  20. final def wait(): Unit

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

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  22. final def wait(arg0: Long): Unit

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