ActorContext.getParent for Java API #22413

akka-docs/rst/java/code/jdocs/stream/javadsl/cookbook/RecipeMissedTicks.java

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+/**
+ *  Copyright (C) 2015-2017 Lightbend Inc. <http://www.lightbend.com/>
+ */
+package jdocs.stream.javadsl.cookbook;
+
+import akka.NotUsed;
+import akka.actor.ActorSystem;
+import akka.japi.Pair;
+import akka.stream.ActorMaterializer;
+import akka.stream.Materializer;
+import akka.stream.javadsl.Flow;
+import akka.stream.javadsl.Keep;
+import akka.stream.javadsl.Sink;
+import akka.stream.javadsl.Source;
+import akka.stream.testkit.TestPublisher;
+import akka.stream.testkit.TestSubscriber;
+import akka.stream.testkit.javadsl.TestSink;
+import akka.stream.testkit.javadsl.TestSource;
+import akka.testkit.JavaTestKit;
+import akka.testkit.TestLatch;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import scala.concurrent.Await;
+import scala.concurrent.duration.Duration;
+import scala.concurrent.duration.FiniteDuration;
+
+import java.util.concurrent.TimeUnit;
+
+public class RecipeMissedTicks extends RecipeTest {
+  static ActorSystem system;
+  static Materializer mat;
+
+  @BeforeClass
+  public static void setup() {
+    system = ActorSystem.create("RecipeMissedTicks");
+    mat = ActorMaterializer.create(system);
+  }
+
+  @AfterClass
+  public static void tearDown() {
+    JavaTestKit.shutdownActorSystem(system);
+    system = null;
+    mat = null;
+  }
+
+  @Test
+  public void work() throws Exception {
+    new JavaTestKit(system) {
+      class Tick {
+      }
+
+      final Tick Tick = new Tick();
+
+      {
+        final Source<Tick, TestPublisher.Probe<Tick>> tickStream = TestSource.probe(system);
+        final Sink<Integer, TestSubscriber.Probe<Integer>> sink = TestSink.probe(system);
+
+        @SuppressWarnings("unused")
+        //#missed-ticks
+        final Flow<Tick, Integer, NotUsed> missedTicks =
+          Flow.of(Tick.class).conflateWithSeed(tick -> 0, (missed, tick) -> missed + 1);
+        //#missed-ticks
+        final TestLatch latch = new TestLatch(3, system);
+        final Flow<Tick, Integer, NotUsed> realMissedTicks =
+                Flow.of(Tick.class).conflateWithSeed(tick -> 0, (missed, tick) -> { latch.countDown(); return missed + 1; });
+
+        Pair<TestPublisher.Probe<Tick>, TestSubscriber.Probe<Integer>> pubSub =
+        		tickStream.via(realMissedTicks).toMat(sink, Keep.both()).run(mat);
+        TestPublisher.Probe<Tick> pub = pubSub.first();
+        TestSubscriber.Probe<Integer> sub = pubSub.second();
+
+        pub.sendNext(Tick);
+        pub.sendNext(Tick);
+        pub.sendNext(Tick);
+        pub.sendNext(Tick);
+
+        FiniteDuration timeout = FiniteDuration.create(200, TimeUnit.MILLISECONDS);
+
+        Await.ready(latch, Duration.create(1, TimeUnit.SECONDS));
+
+        sub.request(1);
+        sub.expectNext(3);
+        sub.request(1);
+        sub.expectNoMsg(timeout);
+
+        pub.sendNext(Tick);
+        sub.expectNext(0);
+
+        pub.sendComplete();
+        sub.request(1);
+        sub.expectComplete();
+
+      }
+    };
+  }
+
+}