Just curious the following code (adapted from
"http://doc.akka.io/docs/akka-stream-and-http-experimental/2.0.2/java/stream-graphs.html";)
compile fails with
an Error:
java: incompatible types:
akka.stream.UniformFanOutShape<java.lang.Object,java.lang.Object> cannot be
converted to akka.stream.UniformFanOutShape<java.lang.Integer,java.lang.Integer>
if I change
final UniformFanOutShape<Integer, Integer> bcast = (UniformFanOutShape<Integer,
Integer>)builder.add(Broadcast.create(2));
to
final UniformFanOutShape<Integer, Integer> bcast =
builder.add(Broadcast.create(2));
everything works.
Can Anybody explain to me what's the reason?
import akka.stream.ClosedShape;
import akka.stream.UniformFanOutShape;
import akka.stream.javadsl.*;
import scala.concurrent.Future;
import java.util.List;
public class Main {
public static void main(String[] args) {
final Sink<List<String>, Future<List<String>>> sink = Sink.head();
final RunnableGraph<Future<List<String>>> result =
RunnableGraph.<Future<List<String>>>fromGraph(
GraphDSL
.create(
sink,
(builder, out) -> {
final UniformFanOutShape<Integer, Integer>
bcast = (UniformFanOutShape<Integer, Integer>)builder.add(Broadcast.create(2));
return ClosedShape.getInstance();
}));
}
}
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