package com.example.kafka;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.common.serialization.StringDeserializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.time.Duration;
import java.util.Arrays;
import java.util.Properties;


public class KafkaConsumer {
    public static void main(String[] args) {
        Logger logger = LoggerFactory.getLogger(KafkaConsumer.class.getName());

        System.out.println(My first Kafka Consumer);

        String bootstrapServers = kafka19092;
        String groupId = order_application;
        String topic = my-topic10;

         create consumer configs
        Properties properties = new Properties();
        properties.setProperty(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
        properties.setProperty(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.setProperty(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
        properties.setProperty(ConsumerConfig.GROUP_ID_CONFIG, groupId);
        properties.setProperty(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, earliest);

         create consumer
        org.apache.kafka.clients.consumer.KafkaConsumer consumer1 =
                   new org.apache.kafka.clients.consumer.KafkaConsumer(properties);

         subscribe consumer to my topic
        consumer1.subscribe(Arrays.asList(topic));

         Poll for new data
        while(true){
            ConsumerRecordsString, String records =
                    consumer1.poll(Duration.ofMillis(100));  new in Kafka 2.0.0

            consumer1.subscribe(Arrays.asList(topic));

            for (ConsumerRecordString, String record  records){
                logger.info(Key  + record.key() + , Value  + record.value());
                logger.info(Partition  + record.partition() + , Offset + record.offset());
                
                System.out.println(record.value());
            }
        }

        System.out.println(Close Producer);
    }
}