Kafka Comsumer Sample

ConsumerClient.java

package kafka;

import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.common.errors.WakeupException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Arrays;
import java.util.Properties;

public class ConsumerClient {
    private static Logger LOG = LoggerFactory.getLogger(ConsumerClient.class);

    public static void main(String[] args) {
        new ConsumerClient().run();
    }

    private void run() {
        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties());
        shutdownHook(consumer);

        consumer.subscribe(Arrays.asList("my-topic"));
        try {
            while (true) {
                ConsumerRecords<String, String> records = consumer.poll(1000);
                records.forEach(record -> {
                    LOG.info("partition = {}, offset = {}, key = {}, value = {}",
                            record.partition(), record.offset(), record.key(), record.value());
                });
                consumer.commitSync();
            }
        } catch (WakeupException e) {
            e.printStackTrace();
        } finally {
            consumer.close();
        }
    }

    private void shutdownHook(KafkaConsumer consumer) {
        Thread mainThread = Thread.currentThread();
        Runtime.getRuntime().addShutdownHook(new Thread(() -> {
            consumer.wakeup();
            try {
                mainThread.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }));
    }

    private static Properties properties() {
        Properties props = new Properties();
        props.put("bootstrap.servers", "192.168.1.1:9092");
        props.put("group.id", "consumer-group1");
        props.put("client.id", "consumer-1");
        props.put("enable.auto.commit", "false");
        props.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        props.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
        return props;
    }
}