1 package de.juplo.kafka;
3 import lombok.RequiredArgsConstructor;
4 import lombok.extern.slf4j.Slf4j;
5 import org.apache.kafka.clients.consumer.ConsumerRecord;
6 import org.apache.kafka.clients.producer.Producer;
7 import org.apache.kafka.clients.producer.ProducerRecord;
9 import java.util.Optional;
12 @RequiredArgsConstructor
14 public class ApplicationRecordHandler implements RecordHandler<String, Integer>
16 private final Producer<String, Object> producer;
17 private final Optional<Integer> errorPosition;
18 private final String id;
19 private final String topic;
21 private int counter = 0;
25 public void accept(ConsumerRecord<String, Integer> record)
27 String key = record.key();
28 int number = record.value();
30 for (int i = 1; i <= number; i++)
32 if (errorPosition.isPresent() && ++counter == errorPosition.get())
34 log.info("{} - Erzeuge fachlichen Fehler!");
35 send(key, new AddNumberMessage(number, counter * -1));
37 send(key, new AddNumberMessage(number, i));
39 send(key, new CalculateSumMessage(number));
42 private void send(String key, Object value)
44 final long time = System.currentTimeMillis();
46 final ProducerRecord<String, Object> record = new ProducerRecord<>(
52 producer.send(record, (metadata, e) ->
54 long now = System.currentTimeMillis();
59 "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
73 "{} - ERROR key={} timestamp={} latency={}ms: {}",
76 metadata == null ? -1 : metadata.timestamp(),
83 long now = System.currentTimeMillis();
85 "{} - Queued message with key={} latency={}ms",