Add unit test of redistribute override

Author: tomstepp

runners/google-cloud-dataflow-java/src/test/java/org/apache/beam/runners/dataflow/KafkaReadWithRedistributeOverrideTest.java

@@ -0,0 +1,98 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.beam.runners.dataflow;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.nullValue;
+
+import java.io.Serializable;
+import java.util.Collections;
+import org.apache.beam.sdk.Pipeline;
+import org.apache.beam.sdk.io.kafka.KafkaIO;
+import org.apache.beam.sdk.runners.PTransformOverride;
+import org.apache.beam.sdk.runners.TransformHierarchy.Node;
+import org.apache.beam.sdk.testing.TestPipeline;
+import org.apache.kafka.common.serialization.StringDeserializer;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class KafkaReadWithRedistributeOverrideTest implements Serializable {
+  @Rule public transient TestPipeline p = TestPipeline.create();
+
+  @Test
+  public void testOverrideAppliedWhenRedistributeEnabled() {
+    p.apply(
+        "MatchingRead",
+        KafkaIO.<String, String>read()
+            .withBootstrapServers("localhost:9092")
+            .withTopic("test_match")
+            .withKeyDeserializer(StringDeserializer.class)
+            .withValueDeserializer(StringDeserializer.class)
+            .withRedistribute());
+    p.apply(
+        "NonMatchingRead",
+        KafkaIO.<String, String>read()
+            .withBootstrapServers("localhost:9092")
+            .withTopic("test_nomatch")
+            .withKeyDeserializer(StringDeserializer.class)
+            .withValueDeserializer(StringDeserializer.class));
+
+    p.replaceAll(
+        Collections.singletonList(
+            PTransformOverride.of(
+                KafkaReadWithRedistributeOverride.matcher(),
+                new KafkaReadWithRedistributeOverride.Factory<>())));
+
+    Pipeline.PipelineVisitor visitor =
+        new Pipeline.PipelineVisitor.Defaults() {
+
+          private boolean matchingVisited = false;
+          private boolean nonMatchingVisited = false;
+
+          @Override
+          public CompositeBehavior enterCompositeTransform(Node node) {
+            if (node.getTransform() instanceof KafkaIO.Read) {
+              KafkaIO.Read<?, ?> read = (KafkaIO.Read<?, ?>) node.getTransform();
+              if (read.getTopics().contains("test_match")) {
+                assertThat(read.isRedistributed(), is(true));
+                assertThat(read.getOffsetDeduplication(), is(true));
+                matchingVisited = true;
+              } else if (read.getTopics().contains("test_nomatch")) {
+                assertThat(read.isRedistributed(), is(false));
+                assertThat(read.getOffsetDeduplication(), nullValue());
+                nonMatchingVisited = true;
+              }
+            }
+            return CompositeBehavior.ENTER_TRANSFORM;
+          }
+
+          @Override
+          public void leaveCompositeTransform(Node node) {
+            if (node.isRootNode()) {
+              assertThat("Matching transform was not visited", matchingVisited, is(true));
+              assertThat("Non-matching transform was not visited", nonMatchingVisited, is(true));
+            }
+          }
+        };
+    p.traverseTopologically(visitor);
+  }
+}