Hi Igmar,
You can do a map on the source and pass the new returned Source as the
second parameter to Flow.fromSinkAndSource instead of the original source.
Something like this (untested):
final Source<X, NotUsed> source = Source.range(1, 100).map(v -> new X());
final Sink<X, CompletionStage<Done>> sink = Sink.foreach(v ->
System.out.println(v));
final Flow<X, Integer, NotUsed> flow = Flow.fromSinkAndSource(sink, source);
Hope that helps,
Michał
On 03/05/17 10:42, Igmar Palsenberg wrote:
Hi,
I'm starting to learn the basics of Akka Streams, and I have this :
final Source<Integer, NotUsed> source = Source.range(1, 100);
final Sink<X, CompletionStage<Done>> sink = Sink.foreach(v ->
System.out.println(v));
final Flow<X, Integer, NotUsed> flow = Flow.fromSinkAndSource(sink,
source);
What I'v read from the docs :
Flow
A processing stage which has /exactly one input and output/, which
connects its up- and downstreams by transforming the data elements
flowing through it.
If I understand correctly, I could transform an Integer to an X. A map
on flow doesn't work, since that requires an Integer to be returned. I
tried :
Flow<X, X, NotUsed> x = flow.map(v -> return new X() );
but then I can't materialize the flow using runWith, since it requires
both a sink and a source (why ?? Since fromSinkAndSource already
provided that).
Can someone shed a light on this ?
Regards,
Igmar
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