@Test
public void mustBeAbleToUseVoidTypeInForeach() {
final JavaTestKit probe = new JavaTestKit(system);
final java.lang.Iterable<String> input = Arrays.asList("a", "b", "c");
Source<String, NotUsed> ints = Source.from(input);
final CompletionStage<Done> completion =
ints.runForeach(elem -> probe.getRef().tell(elem, ActorRef.noSender()), materializer);
completion.thenAccept(elem -> probe.getRef().tell(String.valueOf(elem), ActorRef.noSender()));
probe.expectMsgEquals("a");
probe.expectMsgEquals("b");
probe.expectMsgEquals("c");
probe.expectMsgEquals("Done");
}
@Test
public void demonstrateFilterAndMap() {
final SilenceSystemOut.System System = SilenceSystemOut.get();
// #first-sample
// #authors-filter-map
final Source<Author, NotUsed> authors =
tweets.filter(t -> t.hashtags().contains(AKKA)).map(t -> t.author);
// #first-sample
// #authors-filter-map
new Object() {
// #authors-collect
JavaPartialFunction<Tweet, Author> collectFunction =
new JavaPartialFunction<Tweet, Author>() {
public Author apply(Tweet t, boolean isCheck) {
if (t.hashtags().contains(AKKA)) {
if (isCheck) return null; // to spare the expensive or side-effecting code
return t.author;
} else {
throw noMatch();
}
}
};
final Source<Author, NotUsed> authors = tweets.collect(collectFunction);
// #authors-collect
};
// #first-sample
// #authors-foreachsink-println
authors.runWith(Sink.foreach(a -> System.out.println(a)), mat);
// #first-sample
// #authors-foreachsink-println
// #authors-foreach-println
authors.runForeach(a -> System.out.println(a), mat);
// #authors-foreach-println
}