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.HashMap;
  import java.util.Map;
  
  import scala.Tuple2;
  
  import kafka.common.TopicAndPartition;
  import kafka.message.MessageAndMetadata;
  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.JavaRDD;
  import org.apache.spark.api.java.JavaSparkContext;
  import org.apache.spark.api.java.function.Function;
  
  public class JavaKafkaRDDSuite implements Serializable {
    private transient JavaSparkContext sc = null;
    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());
      sc = new JavaSparkContext(sparkConf);
    }
  
    @After
    public void tearDown() {
      if (sc != null) {
        sc.stop();
        sc = null;
      }
  
      if (kafkaTestUtils != null) {
        kafkaTestUtils.teardown();
        kafkaTestUtils = null;
      }
    }
  
    @Test
    public void testKafkaRDD() throws InterruptedException {
      String topic1 = "topic1";
      String topic2 = "topic2";
  
      createTopicAndSendData(topic1);
      createTopicAndSendData(topic2);
  
      Map<String, String> kafkaParams = new HashMap<>();
      kafkaParams.put("metadata.broker.list", kafkaTestUtils.brokerAddress());
  
      OffsetRange[] offsetRanges = {
        OffsetRange.create(topic1, 0, 0, 1),
        OffsetRange.create(topic2, 0, 0, 1)
      };
  
      Map<TopicAndPartition, Broker> emptyLeaders = new HashMap<>();
      Map<TopicAndPartition, Broker> leaders = new HashMap<>();
      String[] hostAndPort = kafkaTestUtils.brokerAddress().split(":");
      Broker broker = Broker.create(hostAndPort[0], Integer.parseInt(hostAndPort[1]));
      leaders.put(new TopicAndPartition(topic1, 0), broker);
      leaders.put(new TopicAndPartition(topic2, 0), broker);
  
      JavaRDD<String> rdd1 = KafkaUtils.createRDD(
          sc,
          String.class,
          String.class,
          StringDecoder.class,
          StringDecoder.class,
          kafkaParams,
          offsetRanges
      ).map(
          new Function<Tuple2<String, String>, String>() {
            @Override
            public String call(Tuple2<String, String> kv) {
              return kv._2();
            }
          }
      );
  
      JavaRDD<String> rdd2 = KafkaUtils.createRDD(
          sc,
          String.class,
          String.class,
          StringDecoder.class,
          StringDecoder.class,
          String.class,
          kafkaParams,
          offsetRanges,
          emptyLeaders,
          new Function<MessageAndMetadata<String, String>, String>() {
            @Override
            public String call(MessageAndMetadata<String, String> msgAndMd) {
              return msgAndMd.message();
            }
          }
      );
  
      JavaRDD<String> rdd3 = KafkaUtils.createRDD(
          sc,
          String.class,
          String.class,
          StringDecoder.class,
          StringDecoder.class,
          String.class,
          kafkaParams,
          offsetRanges,
          leaders,
          new Function<MessageAndMetadata<String, String>, String>() {
            @Override
            public String call(MessageAndMetadata<String, String> msgAndMd) {
              return msgAndMd.message();
            }
          }
      );
  
      // just making sure the java user apis work; the scala tests handle logic corner cases
      long count1 = rdd1.count();
      long count2 = rdd2.count();
      long count3 = rdd3.count();
      Assert.assertTrue(count1 > 0);
      Assert.assertEquals(count1, count2);
      Assert.assertEquals(count1, count3);
    }
  
    private  String[] createTopicAndSendData(String topic) {
      String[] data = { topic + "-1", topic + "-2", topic + "-3"};
      kafkaTestUtils.createTopic(topic, 1);
      kafkaTestUtils.sendMessages(topic, data);
      return data;
    }
  }
  