1 package de.juplo.kafka;
3 import lombok.RequiredArgsConstructor;
4 import lombok.extern.slf4j.Slf4j;
5 import org.apache.kafka.clients.consumer.Consumer;
6 import org.apache.kafka.clients.consumer.ConsumerRecord;
7 import org.apache.kafka.clients.consumer.ConsumerRecords;
8 import org.apache.kafka.common.errors.WakeupException;
10 import java.time.Duration;
11 import java.util.Arrays;
15 @RequiredArgsConstructor
16 public class SimpleConsumer
18 private final String id;
19 private final String topic;
20 private final Consumer<String, String> consumer;
22 private long consumed = 0;
29 log.info("{} - Subscribing to topic test", id);
30 consumer.subscribe(Arrays.asList(topic));
34 ConsumerRecords<String, String> records =
35 consumer.poll(Duration.ofSeconds(1));
37 log.info("{} - Received {} messages", id, records.count());
38 for (ConsumerRecord<String, String> record : records)
42 "{} - {}: {}/{} - {}={}",
53 catch(WakeupException e)
55 log.info("{} - Consumer was signaled to finish its work", id);
59 log.error("{} - Unexpected error: {}, unsubscribing!", id, e.toString());
60 consumer.unsubscribe();
64 log.info("{} - Closing the KafkaConsumer", id);
66 log.info("{}: Consumed {} messages in total, exiting!", id, consumed);