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+str Add Flow.lazyInit (#24427) (#24527)

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gosubpl 2018-02-22 08:11:31 +01:00 • committed by Patrik Nordwall
parent 80da4cadee
commit edc67e0c3f
7 changed files with 445 additions and 2 deletions
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20
akka-stream-tests/src/test/java/akka/stream/javadsl/FlowTest.java
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@ -961,4 +961,24 @@ public class FlowTest extends StreamTest {
final Flow<Integer, Integer, NotUsed> f = Flow.of(Integer.class).divertTo(Sink.ignore(), e -> true);
final Flow<Integer, Integer, String> f2 = Flow.of(Integer.class).divertToMat(Sink.ignore(), e -> true, (i, n) -> "foo");
}
@Test
public void mustBeAbleToUseLazyInit() throws Exception {
final CompletionStage<Flow<Integer, Integer, NotUsed>> future = new CompletableFuture<Flow<Integer, Integer, NotUsed>>();
future.toCompletableFuture().complete(Flow.fromFunction((id) -> id));
Creator<NotUsed> ignoreFunction = new Creator<NotUsed>() {
@Override
public NotUsed create() throws Exception {
return NotUsed.getInstance();
}
};
Integer result =
Source.range(1, 10)
.via(Flow.lazyInit((i) -> future, ignoreFunction))
.runWith(Sink.<Integer>head(), materializer)
.toCompletableFuture().get(3, TimeUnit.SECONDS);
assertEquals((Object) 1, result);
}
}