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#19444 simplify signature of FlowOps.expand

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Any previous usage can be represented in this fashion while typically
saving one function allocation and also saving the function literal’s
syntax overhead (for the seed). Plus a new feature: the provided
iterator does not have to be infinite, limiting how far expand is
allowed to go.
This commit is contained in:
Roland Kuhn 2016-01-18 11:29:14 +01:00
parent a12451e007
commit 7463c50fc9
16 changed files with 127 additions and 151 deletions
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10
akka-docs/rst/java/code/docs/stream/RateTransformationDocTest.java
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@ -109,7 +109,7 @@ public class RateTransformationDocTest {
public void expandShouldRepeatLast() throws Exception {
//#expand-last
final Flow<Double, Double, NotUsed> lastFlow = Flow.of(Double.class)
.expand(d -> d, s -> new Pair<>(s, s));
.expand(in -> Stream.iterate(in, i -> i).iterator());
//#expand-last
final Pair<TestPublisher.Probe<Double>, Future<List<Double>>> probeFut = TestSource.<Double> probe(system)
@ -132,15 +132,11 @@ public class RateTransformationDocTest {
@SuppressWarnings("unused")
//#expand-drift
final Flow<Double, Pair<Double, Integer>, NotUsed> driftFlow = Flow.of(Double.class)
.expand(d -> new Pair<Double, Integer>(d, 0), t -> {
return new Pair<>(t, new Pair<>(t.first(), t.second() + 1));
});
.expand(d -> Stream.iterate(0, i -> i + 1).map(i -> new Pair<>(d, i)).iterator());
//#expand-drift
final TestLatch latch = new TestLatch(2, system);
final Flow<Double, Pair<Double, Integer>, NotUsed> realDriftFlow = Flow.of(Double.class)
.expand(d -> { latch.countDown(); return new Pair<Double, Integer>(d, 0); }, t -> {
return new Pair<>(t, new Pair<>(t.first(), t.second() + 1));
});
.expand(d -> { latch.countDown(); return Stream.iterate(0, i -> i + 1).map(i -> new Pair<>(d, i)).iterator(); });
final Pair<TestPublisher.Probe<Double>, TestSubscriber.Probe<Pair<Double, Integer>>> pubSub = TestSource.<Double> probe(system)
.via(realDriftFlow)