content: /*
   * 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.spark.streaming.kafka;
  
  import java.io.Serializable;
  import java.util.*;
  
  import scala.Tuple2;
  
  import kafka.serializer.StringDecoder;
  import org.junit.After;
  import org.junit.Assert;
  import org.junit.Before;
  import org.junit.Test;
  
  import org.apache.spark.SparkConf;
  import org.apache.spark.api.java.JavaPairRDD;
  import org.apache.spark.api.java.function.Function;
  import org.apache.spark.api.java.function.VoidFunction;
  import org.apache.spark.storage.StorageLevel;
  import org.apache.spark.streaming.Duration;
  import org.apache.spark.streaming.api.java.JavaDStream;
  import org.apache.spark.streaming.api.java.JavaPairDStream;
  import org.apache.spark.streaming.api.java.JavaStreamingContext;
  
  public class JavaKafkaStreamSuite implements Serializable {
    private transient JavaStreamingContext ssc = null;
    private transient Random random = new Random();
    private transient KafkaTestUtils kafkaTestUtils = null;
  
    @Before
    public void setUp() {
      kafkaTestUtils = new KafkaTestUtils();
      kafkaTestUtils.setup();
      SparkConf sparkConf = new SparkConf()
        .setMaster("local[4]").setAppName(this.getClass().getSimpleName());
      ssc = new JavaStreamingContext(sparkConf, new Duration(500));
    }
  
    @After
    public void tearDown() {
      if (ssc != null) {
        ssc.stop();
        ssc = null;
      }
  
      if (kafkaTestUtils != null) {
        kafkaTestUtils.teardown();
        kafkaTestUtils = null;
      }
    }
  
    @Test
    public void testKafkaStream() throws InterruptedException {
      String topic = "topic1";
      Map<String, Integer> topics = new HashMap<>();
      topics.put(topic, 1);
  
      Map<String, Integer> sent = new HashMap<>();
      sent.put("a", 5);
      sent.put("b", 3);
      sent.put("c", 10);
  
      kafkaTestUtils.createTopic(topic, 1);
      kafkaTestUtils.sendMessages(topic, sent);
  
      Map<String, String> kafkaParams = new HashMap<>();
      kafkaParams.put("zookeeper.connect", kafkaTestUtils.zkAddress());
      kafkaParams.put("group.id", "test-consumer-" + random.nextInt(10000));
      kafkaParams.put("auto.offset.reset", "smallest");
  
      JavaPairDStream<String, String> stream = KafkaUtils.createStream(ssc,
        String.class,
        String.class,
        StringDecoder.class,
        StringDecoder.class,
        kafkaParams,
        topics,
        StorageLevel.MEMORY_ONLY_SER());
  
      final Map<String, Long> result = Collections.synchronizedMap(new HashMap<String, Long>());
  
      JavaDStream<String> words = stream.map(
        new Function<Tuple2<String, String>, String>() {
          @Override
          public String call(Tuple2<String, String> tuple2) {
            return tuple2._2();
          }
        }
      );
  
      words.countByValue().foreachRDD(new VoidFunction<JavaPairRDD<String, Long>>() {
          @Override
          public void call(JavaPairRDD<String, Long> rdd) {
            List<Tuple2<String, Long>> ret = rdd.collect();
            for (Tuple2<String, Long> r : ret) {
              if (result.containsKey(r._1())) {
                result.put(r._1(), result.get(r._1()) + r._2());
              } else {
                result.put(r._1(), r._2());
              }
            }
          }
        }
      );
  
      ssc.start();
  
      long startTime = System.currentTimeMillis();
      AssertionError lastError = null;
      while (System.currentTimeMillis() - startTime < 20000) {
        try {
          Assert.assertEquals(sent.size(), result.size());
          for (Map.Entry<String, Integer> e : sent.entrySet()) {
            Assert.assertEquals(e.getValue().intValue(), result.get(e.getKey()).intValue());
          }
          return;
        } catch (AssertionError e) {
          lastError = e;
        }
        Thread.sleep(200);
      }
      if (lastError != null) {
        throw lastError;
      } else {
        Assert.fail("timeout");
      }
    }
  }
  