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.kafka010;
  
  import java.io.Serializable;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Random;
  
  import org.apache.kafka.common.serialization.StringDeserializer;
  import org.apache.kafka.common.TopicPartition;
  import org.apache.kafka.clients.consumer.ConsumerRecord;
  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";
  
      Random random = new Random();
  
      createTopicAndSendData(topic1);
      createTopicAndSendData(topic2);
  
      Map<String, Object> kafkaParams = new HashMap<>();
      kafkaParams.put("bootstrap.servers", kafkaTestUtils.brokerAddress());
      kafkaParams.put("key.deserializer", StringDeserializer.class);
      kafkaParams.put("value.deserializer", StringDeserializer.class);
      kafkaParams.put("group.id", "java-test-consumer-" + random.nextInt() +
        "-" + System.currentTimeMillis());
  
      OffsetRange[] offsetRanges = {
        OffsetRange.create(topic1, 0, 0, 1),
        OffsetRange.create(topic2, 0, 0, 1)
      };
  
      Map<TopicPartition, String> leaders = new HashMap<>();
      String[] hostAndPort = kafkaTestUtils.brokerAddress().split(":");
      String broker = hostAndPort[0];
      leaders.put(offsetRanges[0].topicPartition(), broker);
      leaders.put(offsetRanges[1].topicPartition(), broker);
  
      Function<ConsumerRecord<String, String>, String> handler =
        new Function<ConsumerRecord<String, String>, String>() {
          @Override
          public String call(ConsumerRecord<String, String> r) {
            return r.value();
          }
        };
  
      JavaRDD<String> rdd1 = KafkaUtils.<String, String>createRDD(
          sc,
          kafkaParams,
          offsetRanges,
          LocationStrategies.PreferFixed(leaders)
      ).map(handler);
  
      JavaRDD<String> rdd2 = KafkaUtils.<String, String>createRDD(
          sc,
          kafkaParams,
          offsetRanges,
          LocationStrategies.PreferConsistent()
      ).map(handler);
  
      // just making sure the java user apis work; the scala tests handle logic corner cases
      long count1 = rdd1.count();
      long count2 = rdd2.count();
      Assert.assertTrue(count1 > 0);
      Assert.assertEquals(count1, count2);
    }
  
    private  String[] createTopicAndSendData(String topic) {
      String[] data = { topic + "-1", topic + "-2", topic + "-3"};
      kafkaTestUtils.createTopic(topic);
      kafkaTestUtils.sendMessages(topic, data);
      return data;
    }
  }
  