@Test
public void materializedValues() throws Exception {
// #mat-combine-1
// Materializes to Promise<BoxedUnit> (red)
final Source<Integer, CompletableFuture<Optional<Integer>>> source = Source.<Integer>maybe();
// Materializes to BoxedUnit (black)
final Flow<Integer, Integer, NotUsed> flow1 = Flow.of(Integer.class).take(100);
// Materializes to Promise<Option<>> (red)
final Source<Integer, CompletableFuture<Optional<Integer>>> nestedSource =
source.viaMat(flow1, Keep.left()).named("nestedSource");
// #mat-combine-1
// #mat-combine-2
// Materializes to BoxedUnit (orange)
final Flow<Integer, ByteString, NotUsed> flow2 =
Flow.of(Integer.class).map(i -> ByteString.fromString(i.toString()));
// Materializes to Future<OutgoingConnection> (yellow)
final Flow<ByteString, ByteString, CompletionStage<OutgoingConnection>> flow3 =
Tcp.get(system).outgoingConnection("localhost", 8080);
// Materializes to Future<OutgoingConnection> (yellow)
final Flow<Integer, ByteString, CompletionStage<OutgoingConnection>> nestedFlow =
flow2.viaMat(flow3, Keep.right()).named("nestedFlow");
// #mat-combine-2
// #mat-combine-3
// Materializes to Future<String> (green)
final Sink<ByteString, CompletionStage<String>> sink =
Sink.<String, ByteString>fold("", (acc, i) -> acc + i.utf8String());
// Materializes to Pair<Future<OutgoingConnection>, Future<String>> (blue)
final Sink<Integer, Pair<CompletionStage<OutgoingConnection>, CompletionStage<String>>>
nestedSink = nestedFlow.toMat(sink, Keep.both());
// #mat-combine-3
// #mat-combine-4b
// Materializes to Future<MyClass> (purple)
final RunnableGraph<CompletionStage<MyClass>> runnableGraph =
nestedSource.toMat(nestedSink, Combiner::f);
// #mat-combine-4b
}
