package com.lun.kafka.consumer;

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

import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.OffsetAndMetadata;
import org.apache.kafka.clients.consumer.OffsetCommitCallback;
import org.apache.kafka.common.TopicPartition;

public class AsyncCommitOffset {
	public static void main(String[] args) {
		Properties props = new Properties();
		// Kafka 集群
		props.put("bootstrap.servers", "hadoop102:9092");
		// 消费者组，只要 group.id 相同，就属于同一个消费者组
		props.put("group.id", "test");

		// 关闭自动提交 offset
		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");
		KafkaConsumer<String, String> consumer = new KafkaConsumer<>(props);
		consumer.subscribe(Arrays.asList("first"));// 消费者订阅主题
		while (true) {
			ConsumerRecords<String, String> records = consumer.poll(100);// 消费者拉取数据
			for (ConsumerRecord<String, String> record : records) {
				System.out.printf("offset = %d, key = %s, value = %s%n", record.offset(), record.key(), record.value());
			}
			// 异步提交
			consumer.commitAsync(new OffsetCommitCallback() {
				@Override
				public void onComplete(Map<TopicPartition, OffsetAndMetadata> offsets, Exception exception) {
					if (exception != null) {
						System.err.println("Commit failed for" + offsets);
					}
				}
			});
		}
	}
}