+doc #19429 initial merge of docs-dev and docs

akka-docs/rst/java/code/docs/stream/javadsl/cookbook/RecipeToStrict.java

@@ -0,0 +1,57 @@
+/**
+ *  Copyright (C) 2015 Typesafe <http://typesafe.com/>
+ */
+package docs.stream.javadsl.cookbook;
+
+import akka.actor.ActorSystem;
+import akka.stream.ActorMaterializer;
+import akka.stream.Materializer;
+import akka.stream.javadsl.Sink;
+import akka.stream.javadsl.Source;
+import akka.testkit.JavaTestKit;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import scala.concurrent.Await;
+import scala.concurrent.Future;
+import scala.concurrent.duration.FiniteDuration;
+import scala.runtime.BoxedUnit;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+public class RecipeToStrict extends RecipeTest {
+  static ActorSystem system;
+
+  @BeforeClass
+  public static void setup() {
+    system = ActorSystem.create("RecipeLoggingElements");
+  }
+
+  @AfterClass
+  public static void tearDown() {
+    JavaTestKit.shutdownActorSystem(system);
+    system = null;
+  }
+
+  final Materializer mat = ActorMaterializer.create(system);
+
+  @Test
+  public void workWithPrintln() throws Exception {
+    new JavaTestKit(system) {
+      {
+        final Source<String, BoxedUnit> myData = Source.from(Arrays.asList("1", "2", "3"));
+        final int MAX_ALLOWED_SIZE = 100;
+
+        //#draining-to-list
+        final Future<List<String>> strings = myData
+          .grouped(MAX_ALLOWED_SIZE).runWith(Sink.head(), mat);
+        //#draining-to-list
+
+        Await.result(strings, new FiniteDuration(1, TimeUnit.SECONDS));
+      }
+    };
+  }
+
+}