554 lines
20 KiB
Java
554 lines
20 KiB
Java
/**
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* Copyright (C) 2014 Typesafe Inc. <http://www.typesafe.com>
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*/
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package akka.stream.javadsl;
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import akka.actor.ActorRef;
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import akka.actor.Cancellable;
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import akka.dispatch.Foreach;
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import akka.dispatch.Futures;
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import akka.dispatch.OnSuccess;
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import akka.japi.JavaPartialFunction;
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import akka.japi.Pair;
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import akka.stream.OverflowStrategy;
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import akka.stream.StreamTest;
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import akka.stream.stage.*;
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import akka.japi.function.*;
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import akka.stream.testkit.AkkaSpec;
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import akka.testkit.JavaTestKit;
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import org.junit.ClassRule;
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import org.junit.Test;
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import scala.concurrent.Await;
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import scala.concurrent.Future;
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import scala.concurrent.duration.Duration;
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import scala.concurrent.duration.FiniteDuration;
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import scala.runtime.BoxedUnit;
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import scala.util.Try;
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import java.util.*;
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import java.util.concurrent.Callable;
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import java.util.concurrent.TimeUnit;
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import static org.junit.Assert.assertEquals;
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@SuppressWarnings("serial")
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public class SourceTest extends StreamTest {
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public SourceTest() {
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super(actorSystemResource);
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}
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@ClassRule
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public static AkkaJUnitActorSystemResource actorSystemResource = new AkkaJUnitActorSystemResource("SourceTest",
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AkkaSpec.testConf());
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@Test
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public void mustBeAbleToUseSimpleOperators() {
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final JavaTestKit probe = new JavaTestKit(system);
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final String[] lookup = {"a", "b", "c", "d", "e", "f"};
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final java.lang.Iterable<Integer> input = Arrays.asList(0, 1, 2, 3, 4, 5);
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final Source<Integer, ?> ints = Source.from(input);
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ints.drop(2).take(3).takeWithin(FiniteDuration.create(10, TimeUnit.SECONDS)).map(new Function<Integer, String>() {
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public String apply(Integer elem) {
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return lookup[elem];
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}
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}).filter(new Predicate<String>() {
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public boolean test(String elem) {
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return !elem.equals("c");
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}
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}).grouped(2).mapConcat(new Function<java.util.List<String>, java.util.List<String>>() {
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public java.util.List<String> apply(java.util.List<String> elem) {
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return elem;
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}
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}).groupedWithin(100, FiniteDuration.create(50, TimeUnit.MILLISECONDS))
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.mapConcat(new Function<java.util.List<String>, java.util.List<String>>() {
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public java.util.List<String> apply(java.util.List<String> elem) {
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return elem;
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}
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}).runFold("", new Function2<String, String, String>() {
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public String apply(String acc, String elem) {
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return acc + elem;
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}
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}, materializer).foreach(new Foreach<String>() { // Scala Future
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public void each(String elem) {
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probe.getRef().tell(elem, ActorRef.noSender());
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}
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}, system.dispatcher());
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probe.expectMsgEquals("de");
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}
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@Test
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public void mustBeAbleToUseVoidTypeInForeach() {
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final JavaTestKit probe = new JavaTestKit(system);
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final java.lang.Iterable<String> input = Arrays.asList("a", "b", "c");
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Source<String, ?> ints = Source.from(input);
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Future<BoxedUnit> completion = ints.runForeach(new Procedure<String>() {
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public void apply(String elem) {
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probe.getRef().tell(elem, ActorRef.noSender());
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}
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}, materializer);
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completion.onSuccess(new OnSuccess<BoxedUnit>() {
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@Override
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public void onSuccess(BoxedUnit elem) throws Throwable {
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probe.getRef().tell(String.valueOf(elem), ActorRef.noSender());
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}
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}, system.dispatcher());
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probe.expectMsgEquals("a");
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probe.expectMsgEquals("b");
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probe.expectMsgEquals("c");
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probe.expectMsgEquals("()");
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}
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@Test
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public void mustBeAbleToUseTransform() {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<Integer> input = Arrays.asList(0, 1, 2, 3, 4, 5, 6, 7);
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// duplicate each element, stop after 4 elements, and emit sum to the end
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Source.from(input).transform(new Creator<Stage<Integer, Integer>>() {
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@Override
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public PushPullStage<Integer, Integer> create() throws Exception {
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return new StatefulStage<Integer, Integer>() {
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int sum = 0;
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int count = 0;
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@Override
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public StageState<Integer, Integer> initial() {
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return new StageState<Integer, Integer>() {
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@Override
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public SyncDirective onPush(Integer element, Context<Integer> ctx) {
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sum += element;
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count += 1;
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if (count == 4) {
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return emitAndFinish(Arrays.asList(element, element, sum).iterator(), ctx);
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} else {
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return emit(Arrays.asList(element, element).iterator(), ctx);
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}
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}
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};
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}
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@Override
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public TerminationDirective onUpstreamFinish(Context<Integer> ctx) {
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return terminationEmit(Collections.singletonList(sum).iterator(), ctx);
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}
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};
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}
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}).runForeach(new Procedure<Integer>() {
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public void apply(Integer elem) {
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probe.getRef().tell(elem, ActorRef.noSender());
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}
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}, materializer);
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probe.expectMsgEquals(0);
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probe.expectMsgEquals(0);
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probe.expectMsgEquals(1);
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probe.expectMsgEquals(1);
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probe.expectMsgEquals(2);
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probe.expectMsgEquals(2);
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probe.expectMsgEquals(3);
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probe.expectMsgEquals(3);
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probe.expectMsgEquals(6);
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}
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@Test
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public void mustBeAbleToUseGroupBy() {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<String> input = Arrays.asList("Aaa", "Abb", "Bcc", "Cdd", "Cee");
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Source.from(input).groupBy(new Function<String, String>() {
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public String apply(String elem) {
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return elem.substring(0, 1);
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}
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}).runForeach(new Procedure<Pair<String, Source<String, BoxedUnit>>>() {
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@Override
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public void apply(final Pair<String, Source<String, BoxedUnit>> pair) throws Exception {
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pair.second().runForeach(new Procedure<String>() {
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@Override
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public void apply(String elem) throws Exception {
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probe.getRef().tell(new Pair<String, String>(pair.first(), elem), ActorRef.noSender());
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}
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}, materializer);
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}
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}, materializer);
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Map<String, List<String>> grouped = new HashMap<String, List<String>>();
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for (Object o : probe.receiveN(5)) {
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@SuppressWarnings("unchecked")
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Pair<String, String> p = (Pair<String, String>) o;
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List<String> g = grouped.get(p.first());
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if (g == null) {
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g = new ArrayList<String>();
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}
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g.add(p.second());
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grouped.put(p.first(), g);
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}
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assertEquals(Arrays.asList("Aaa", "Abb"), grouped.get("A"));
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}
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@Test
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public void mustBeAbleToUseSplitWhen() {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<String> input = Arrays.asList("A", "B", "C", ".", "D", ".", "E", "F");
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Source.from(input).splitWhen(new Predicate<String>() {
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public boolean test(String elem) {
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return elem.equals(".");
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}
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}).runForeach(new Procedure<Source<String, BoxedUnit>>() {
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@Override
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public void apply(Source<String, BoxedUnit> subStream) throws Exception {
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subStream.filter(new Predicate<String>() {
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@Override
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public boolean test(String elem) {
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return !elem.equals(".");
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}
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}).grouped(10).runForeach(new Procedure<List<String>>() {
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@Override
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public void apply(List<String> chunk) throws Exception {
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probe.getRef().tell(chunk, ActorRef.noSender());
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}
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}, materializer);
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}
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}, materializer);
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for (Object o : probe.receiveN(3)) {
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@SuppressWarnings("unchecked")
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List<String> chunk = (List<String>) o;
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if (chunk.get(0).equals("A")) {
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assertEquals(Arrays.asList("A", "B", "C"), chunk);
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} else if (chunk.get(0).equals("D")) {
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assertEquals(Arrays.asList("D"), chunk);
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} else if (chunk.get(0).equals("E")) {
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assertEquals(Arrays.asList("E", "F"), chunk);
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} else {
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assertEquals("[A, B, C] or [D] or [E, F]", chunk);
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}
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}
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}
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@Test
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public void mustBeAbleToUseConcat() {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<String> input1 = Arrays.asList("A", "B", "C");
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final Iterable<String> input2 = Arrays.asList("D", "E", "F");
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final Source<String, ?> in1 = Source.from(input1);
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final Source<String, ?> in2 = Source.from(input2);
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in1.concat(in2).runForeach(new Procedure<String>() {
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public void apply(String elem) {
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probe.getRef().tell(elem, ActorRef.noSender());
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}
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}, materializer);
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List<Object> output = Arrays.asList(probe.receiveN(6));
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assertEquals(Arrays.asList("A", "B", "C", "D", "E", "F"), output);
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}
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@Test
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public void mustBeAbleToUseCallableInput() {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<Integer> input1 = Arrays.asList(4, 3, 2, 1, 0);
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final Creator<Iterator<Integer>> input = new Creator<Iterator<Integer>>() {
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@Override
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public Iterator<Integer> create() {
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return input1.iterator();
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}
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};
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Source.fromIterator(input).runForeach(new Procedure<Integer>() {
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public void apply(Integer elem) {
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probe.getRef().tell(elem, ActorRef.noSender());
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}
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}, materializer);
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List<Object> output = Arrays.asList(probe.receiveN(5));
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assertEquals(Arrays.asList(4, 3, 2, 1, 0), output);
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probe.expectNoMsg(FiniteDuration.create(500, TimeUnit.MILLISECONDS));
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}
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@Test
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public void mustBeAbleToUseOnCompleteSuccess() {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<String> input = Arrays.asList("A", "B", "C");
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Source.from(input).runWith(Sink.<String>onComplete(new Procedure<Try<BoxedUnit>>() {
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@Override
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public void apply(Try<BoxedUnit> param) throws Exception {
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probe.getRef().tell(param.get(), ActorRef.noSender());
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}
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}), materializer);
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probe.expectMsgClass(BoxedUnit.class);
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}
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@Test
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public void mustBeAbleToUseOnCompleteError() {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<String> input = Arrays.asList("A", "B", "C");
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Source.from(input).map(new Function<String, String>() {
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public String apply(String arg0) throws Exception {
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throw new RuntimeException("simulated err");
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}
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}).runWith(Sink.<String>head(), materializer).onComplete(new OnSuccess<Try<String>>() {
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@Override
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public void onSuccess(Try<String> e) throws Throwable {
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if (e == null) {
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probe.getRef().tell("done", ActorRef.noSender());
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} else {
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probe.getRef().tell(e.failed().get().getMessage(), ActorRef.noSender());
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}
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}
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}, system.dispatcher());
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probe.expectMsgEquals("simulated err");
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}
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@Test
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public void mustBeAbleToUseToFuture() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<String> input = Arrays.asList("A", "B", "C");
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Future<String> future = Source.from(input).runWith(Sink.<String>head(), materializer);
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String result = Await.result(future, probe.dilated(FiniteDuration.create(3, TimeUnit.SECONDS)));
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assertEquals("A", result);
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}
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@Test
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public void mustBeAbleToUsePrefixAndTail() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<Integer> input = Arrays.asList(1, 2, 3, 4, 5, 6);
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Future<Pair<List<Integer>, Source<Integer, BoxedUnit>>> future = Source.from(input).prefixAndTail(3)
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.runWith(Sink.<Pair<List<Integer>, Source<Integer, BoxedUnit>>>head(), materializer);
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Pair<List<Integer>, Source<Integer, BoxedUnit>> result = Await.result(future,
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probe.dilated(FiniteDuration.create(3, TimeUnit.SECONDS)));
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assertEquals(Arrays.asList(1, 2, 3), result.first());
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Future<List<Integer>> tailFuture = result.second().grouped(4).runWith(Sink.<List<Integer>>head(), materializer);
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List<Integer> tailResult = Await.result(tailFuture, probe.dilated(FiniteDuration.create(3, TimeUnit.SECONDS)));
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assertEquals(Arrays.asList(4, 5, 6), tailResult);
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}
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@Test
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public void mustBeAbleToUseConcatAllWithSources() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<Integer> input1 = Arrays.asList(1, 2, 3);
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final Iterable<Integer> input2 = Arrays.asList(4, 5);
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final List<Source<Integer, BoxedUnit>> mainInputs = new ArrayList<Source<Integer,BoxedUnit>>();
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mainInputs.add(Source.from(input1));
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mainInputs.add(Source.from(input2));
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Future<List<Integer>> future = Source.from(mainInputs)
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.flatten(akka.stream.javadsl.FlattenStrategy.<Integer, BoxedUnit>concat()).grouped(6)
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.runWith(Sink.<List<Integer>>head(), materializer);
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List<Integer> result = Await.result(future, probe.dilated(FiniteDuration.create(3, TimeUnit.SECONDS)));
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assertEquals(Arrays.asList(1, 2, 3, 4, 5), result);
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}
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@Test
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public void mustBeAbleToUseBuffer() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final List<String> input = Arrays.asList("A", "B", "C");
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Future<List<String>> future = Source.from(input).buffer(2, OverflowStrategy.backpressure()).grouped(4)
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.runWith(Sink.<List<String>>head(), materializer);
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List<String> result = Await.result(future, probe.dilated(FiniteDuration.create(3, TimeUnit.SECONDS)));
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assertEquals(input, result);
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}
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@Test
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public void mustBeAbleToUseConflate() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final List<String> input = Arrays.asList("A", "B", "C");
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Future<String> future = Source.from(input).conflate(new Function<String, String>() {
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@Override
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public String apply(String s) throws Exception {
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return s;
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}
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}, new Function2<String, String, String>() {
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@Override
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public String apply(String aggr, String in) throws Exception {
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return aggr + in;
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}
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}).runFold("", new Function2<String, String, String>() {
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@Override
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public String apply(String aggr, String in) throws Exception {
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return aggr + in;
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}
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}, materializer);
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String result = Await.result(future, probe.dilated(FiniteDuration.create(3, TimeUnit.SECONDS)));
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assertEquals("ABC", result);
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}
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@Test
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public void mustBeAbleToUseExpand() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final List<String> input = Arrays.asList("A", "B", "C");
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Future<String> future = Source.from(input).expand(new Function<String, String>() {
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@Override
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public String apply(String in) throws Exception {
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return in;
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}
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}, new Function<String, Pair<String, String>>() {
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@Override
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public Pair<String, String> apply(String in) throws Exception {
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return new Pair<String, String>(in, in);
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}
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}).runWith(Sink.<String>head(), materializer);
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String result = Await.result(future, probe.dilated(FiniteDuration.create(3, TimeUnit.SECONDS)));
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assertEquals("A", result);
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}
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@Test
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public void mustProduceTicks() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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Source<String, Cancellable> tickSource = Source.from(FiniteDuration.create(1, TimeUnit.SECONDS),
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FiniteDuration.create(500, TimeUnit.MILLISECONDS), "tick");
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Cancellable cancellable = tickSource.to(Sink.foreach(new Procedure<String>() {
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public void apply(String elem) {
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probe.getRef().tell(elem, ActorRef.noSender());
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}
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})).run(materializer);
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probe.expectNoMsg(FiniteDuration.create(600, TimeUnit.MILLISECONDS));
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probe.expectMsgEquals("tick");
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probe.expectNoMsg(FiniteDuration.create(200, TimeUnit.MILLISECONDS));
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probe.expectMsgEquals("tick");
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probe.expectNoMsg(FiniteDuration.create(200, TimeUnit.MILLISECONDS));
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}
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@Test
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public void mustBeAbleToUseMapFuture() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<String> input = Arrays.asList("a", "b", "c");
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Source.from(input).mapAsync(4, new Function<String, Future<String>>() {
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public Future<String> apply(String elem) {
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return Futures.successful(elem.toUpperCase());
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}
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}).runForeach(new Procedure<String>() {
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public void apply(String elem) {
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probe.getRef().tell(elem, ActorRef.noSender());
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}
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}, materializer);
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probe.expectMsgEquals("A");
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probe.expectMsgEquals("B");
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probe.expectMsgEquals("C");
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}
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@Test
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public void mustWorkFromFuture() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final Iterable<String> input = Arrays.asList("A", "B", "C");
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Future<String> future1 = Source.from(input).runWith(Sink.<String>head(), materializer);
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Future<String> future2 = Source.from(future1).runWith(Sink.<String>head(), materializer);
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String result = Await.result(future2, probe.dilated(FiniteDuration.create(3, TimeUnit.SECONDS)));
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assertEquals("A", result);
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}
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@Test
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public void mustRepeat() throws Exception {
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final Future<List<Integer>> f = Source.repeat(42).grouped(10000).runWith(Sink.<List<Integer>> head(), materializer);
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final List<Integer> result = Await.result(f, FiniteDuration.create(3, TimeUnit.SECONDS));
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assertEquals(result.size(), 10000);
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for (Integer i: result) assertEquals(i, (Integer) 42);
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}
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@Test
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public void mustBeAbleToUseActorRefSource() throws Exception {
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final JavaTestKit probe = new JavaTestKit(system);
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final Source<Integer, ActorRef> actorRefSource = Source.actorRef(10, OverflowStrategy.fail());
|
|
final ActorRef ref = actorRefSource.to(Sink.foreach(new Procedure<Integer>() {
|
|
public void apply(Integer elem) {
|
|
probe.getRef().tell(elem, ActorRef.noSender());
|
|
}
|
|
})).run(materializer);
|
|
ref.tell(1, ActorRef.noSender());
|
|
probe.expectMsgEquals(1);
|
|
ref.tell(2, ActorRef.noSender());
|
|
probe.expectMsgEquals(2);
|
|
}
|
|
|
|
@Test
|
|
public void mustBeAbleToUseDropWhile() throws Exception {
|
|
final JavaTestKit probe = new JavaTestKit(system);
|
|
final Source<Integer, ?> source = Source.from(Arrays.asList(0, 1, 2, 3)).dropWhile
|
|
(new Predicate<Integer>() {
|
|
public boolean test(Integer elem) {
|
|
return elem < 2;
|
|
}
|
|
});
|
|
|
|
final Future<BoxedUnit> future = source.runWith(Sink.foreach(new Procedure<Integer>() { // Scala Future
|
|
public void apply(Integer elem) {
|
|
probe.getRef().tell(elem, ActorRef.noSender());
|
|
}
|
|
}), materializer);
|
|
|
|
probe.expectMsgEquals(2);
|
|
probe.expectMsgEquals(3);
|
|
Await.ready(future, Duration.apply(200, TimeUnit.MILLISECONDS));
|
|
}
|
|
|
|
@Test
|
|
public void mustBeAbleToUseTakeWhile() throws Exception {
|
|
final JavaTestKit probe = new JavaTestKit(system);
|
|
final Source<Integer, ?> source = Source.from(Arrays.asList(0, 1, 2, 3)).takeWhile
|
|
(new Predicate<Integer>() {
|
|
public boolean test(Integer elem) {
|
|
return elem < 2;
|
|
}
|
|
});
|
|
|
|
final Future<BoxedUnit> future = source.runWith(Sink.foreach(new Procedure<Integer>() { // Scala Future
|
|
public void apply(Integer elem) {
|
|
probe.getRef().tell(elem, ActorRef.noSender());
|
|
}
|
|
}), materializer);
|
|
|
|
probe.expectMsgEquals(0);
|
|
probe.expectMsgEquals(1);
|
|
|
|
FiniteDuration duration = Duration.apply(200, TimeUnit.MILLISECONDS);
|
|
|
|
probe.expectNoMsg(duration);
|
|
Await.ready(future, duration);
|
|
}
|
|
|
|
@Test
|
|
public void mustBeAbleToRecover() throws Exception {
|
|
final JavaTestKit probe = new JavaTestKit(system);
|
|
final Source<Integer, ?> source = Source.from(Arrays.asList(0, 1, 2, 3)).map(
|
|
new Function<Integer, Integer>() {
|
|
public Integer apply(Integer elem) {
|
|
if (elem == 2) throw new RuntimeException("ex");
|
|
else return elem;
|
|
}
|
|
})
|
|
.recover(new JavaPartialFunction<Throwable, Integer>() {
|
|
public Integer apply(Throwable elem, boolean isCheck) {
|
|
if (isCheck) return null;
|
|
return 0;
|
|
}
|
|
});
|
|
|
|
final Future<BoxedUnit> future = source.runWith(Sink.foreach(new Procedure<Integer>() {
|
|
public void apply(Integer elem) {
|
|
probe.getRef().tell(elem, ActorRef.noSender());
|
|
}
|
|
}), materializer);
|
|
|
|
probe.expectMsgEquals(0);
|
|
probe.expectMsgEquals(1);
|
|
probe.expectMsgEquals(0);
|
|
Await.ready(future, Duration.apply(200, TimeUnit.MILLISECONDS));
|
|
}
|
|
|
|
}
|