juplo.de Git - demos/kafka/training/blob - src/main/java/de/juplo/kafka/EndlessConsumer.java

   1 package de.juplo.kafka;
   2
   3 import lombok.RequiredArgsConstructor;
   4 import lombok.extern.slf4j.Slf4j;
   5 import org.apache.kafka.clients.consumer.ConsumerRecord;
   6 import org.springframework.beans.factory.annotation.Autowired;
   7 import org.springframework.beans.factory.annotation.Value;
   8 import org.springframework.kafka.annotation.KafkaListener;
   9 import org.springframework.stereotype.Component;
  10
  11 import java.util.List;
  12 import java.util.function.Consumer;
  13
  14
  15 @Component
  16 @Slf4j
  17 @RequiredArgsConstructor
  18 public class EndlessConsumer<K, V>
  19 {
  20   @Value("${consumer.client-id}")
  21   String id;
  22   @Autowired
  23   Consumer<ConsumerRecord<K, V>> handler;
  24
  25
  26   @KafkaListener(topics = "${consumer.topic}", containerFactory = "batchFactory")
  27   public void receive(List<ConsumerRecord<K, V>> records)
  28   {
  29     // Do something with the data...
  30     log.info("{} - Received {} messages", id, records.size());
  31     for (ConsumerRecord<K, V> record : records)
  32     {
  33       log.info(
  34           "{} - {}: {}/{} - {}={}",
  35           id,
  36           record.offset(),
  37           record.topic(),
  38           record.partition(),
  39           record.key(),
  40           record.value()
  41       );
  42
  43       handler.accept(record);
  44     }
  45   }
  46 }