From f144e0413a1e42d193a86fa04af769e2da9dc58b Mon Sep 17 00:00:00 2001
From: Patrick Wendell <pwendell@gmail.com>
Date: Sat, 5 Jan 2013 15:06:20 -0800
Subject: Adding transform and union

---
 .../spark/streaming/api/java/JavaDStream.scala     | 14 +++++
 .../test/scala/spark/streaming/JavaAPISuite.java   | 62 ++++++++++++++++++++--
 2 files changed, 72 insertions(+), 4 deletions(-)

diff --git a/streaming/src/main/scala/spark/streaming/api/java/JavaDStream.scala b/streaming/src/main/scala/spark/streaming/api/java/JavaDStream.scala
index d0fa06ba7b..56e54c719a 100644
--- a/streaming/src/main/scala/spark/streaming/api/java/JavaDStream.scala
+++ b/streaming/src/main/scala/spark/streaming/api/java/JavaDStream.scala
@@ -86,6 +86,20 @@ class JavaDStream[T](val dstream: DStream[T])(implicit val classManifest: ClassM
   def foreach(foreachFunc: JFunction2[JavaRDD[T], Time, Void]) = {
     dstream.foreach((rdd, time) => foreachFunc.call(new JavaRDD(rdd), time))
   }
+
+  def transform[U](transformFunc: JFunction[JavaRDD[T], JavaRDD[U]]): JavaDStream[U] = {
+    implicit val cm: ClassManifest[U] =
+      implicitly[ClassManifest[AnyRef]].asInstanceOf[ClassManifest[U]]
+    def scalaTransform (in: RDD[T]): RDD[U] = {
+      transformFunc.call(new JavaRDD[T](in)).rdd
+    }
+    dstream.transform(scalaTransform(_))
+  }
+  // TODO: transform with time
+
+  def union(that: JavaDStream[T]): JavaDStream[T] = {
+    dstream.union(that.dstream)
+  }
 }
 
 object JavaDStream {
diff --git a/streaming/src/test/scala/spark/streaming/JavaAPISuite.java b/streaming/src/test/scala/spark/streaming/JavaAPISuite.java
index 2d1b0f35f9..c4629c8d97 100644
--- a/streaming/src/test/scala/spark/streaming/JavaAPISuite.java
+++ b/streaming/src/test/scala/spark/streaming/JavaAPISuite.java
@@ -5,6 +5,7 @@ import org.junit.Assert;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
+import spark.api.java.JavaRDD;
 import spark.api.java.function.FlatMapFunction;
 import spark.api.java.function.Function;
 import spark.api.java.function.Function2;
@@ -13,10 +14,7 @@ import spark.streaming.api.java.JavaDStream;
 import spark.streaming.api.java.JavaStreamingContext;
 
 import java.io.Serializable;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.Iterator;
-import java.util.List;
+import java.util.*;
 
 // The test suite itself is Serializable so that anonymous Function implementations can be
 // serialized, as an alternative to converting these anonymous classes to static inner classes;
@@ -271,6 +269,62 @@ public class JavaAPISuite implements Serializable {
     Assert.assertEquals(expected, result);
   }
 
+  @Test
+  public void testTransform() {
+    List<List<Integer>> inputData = Arrays.asList(
+        Arrays.asList(1,2,3),
+        Arrays.asList(4,5,6),
+        Arrays.asList(7,8,9));
+
+    List<List<Integer>> expected = Arrays.asList(
+        Arrays.asList(3,4,5),
+        Arrays.asList(6,7,8),
+        Arrays.asList(9,10,11));
+
+    JavaDStream stream = JavaTestUtils.attachTestInputStream(sc, inputData, 1);
+    JavaDStream transformed = stream.transform(new Function<JavaRDD<Integer>, JavaRDD<Integer>>() {
+      @Override
+      public JavaRDD<Integer> call(JavaRDD<Integer> in) throws Exception {
+        return in.map(new Function<Integer, Integer>() {
+          @Override
+          public Integer call(Integer i) throws Exception {
+            return i + 2;
+          }
+        });
+      }});
+    JavaTestUtils.attachTestOutputStream(transformed);
+    List<List<Integer>> result = JavaTestUtils.runStreams(sc, 3, 3);
+
+    assertOrderInvariantEquals(expected, result);
+  }
+
+  @Test
+  public void testUnion() {
+    List<List<Integer>> inputData1 = Arrays.asList(
+        Arrays.asList(1,1),
+        Arrays.asList(2,2),
+        Arrays.asList(3,3));
+
+    List<List<Integer>> inputData2 = Arrays.asList(
+        Arrays.asList(4,4),
+        Arrays.asList(5,5),
+        Arrays.asList(6,6));
+
+    List<List<Integer>> expected = Arrays.asList(
+        Arrays.asList(1,1,4,4),
+        Arrays.asList(2,2,5,5),
+        Arrays.asList(3,3,6,6));
+
+    JavaDStream stream1 = JavaTestUtils.attachTestInputStream(sc, inputData1, 2);
+    JavaDStream stream2 = JavaTestUtils.attachTestInputStream(sc, inputData2, 2);
+
+    JavaDStream unioned = stream1.union(stream2);
+    JavaTestUtils.attachTestOutputStream(unioned);
+    List<List<Integer>> result = JavaTestUtils.runStreams(sc, 3, 3);
+
+    assertOrderInvariantEquals(expected, result);
+  }
+
   /*
    * Performs an order-invariant comparison of lists representing two RDD streams. This allows
    * us to account for ordering variation within individual RDD's which occurs during windowing.
-- 
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