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