Kafka Consumer Java

public class ConsumerLoop implements Runnable {
  private final KafkaConsumer<String, String> consumer;
  private final List<String> topics;
  private final int id;

  public ConsumerLoop(int id,
                      String groupId,
                      List<String> topics) {
    this.id = id;
    this.topics = topics;
    Properties props = new Properties();
    props.put("bootstrap.servers", "localhost:9092");
    props.put(“group.id”, groupId);
    props.put(“key.deserializer”, StringDeserializer.class.getName());
    props.put(“value.deserializer”, StringDeserializer.class.getName());
    this.consumer = new KafkaConsumer<>(props);
  }

  @Override
  public void run() {
    try {
      consumer.subscribe(topics);

      while (true) {
        ConsumerRecords<String, String> records = consumer.poll(Long.MAX_VALUE);
        for (ConsumerRecord<String, String> record : records) {
          Map<String, Object> data = new HashMap<>();
          data.put("partition", record.partition());
          data.put("offset", record.offset());
          data.put("value", record.value());
          System.out.println(this.id + ": " + data);
        }
      }
    } catch (WakeupException e) {
      // ignore for shutdown
    } finally {
      consumer.close();
    }
  }

  public void shutdown() {
    consumer.wakeup();
  }
}