juplo.de Git - demos/kafka/training/blob - src/main/java/de/juplo/kafka/ApplicationRecordHandler.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.apache.kafka.clients.producer.Producer;
   7 import org.apache.kafka.clients.producer.ProducerRecord;
   8
   9
  10 @RequiredArgsConstructor
  11 @Slf4j
  12 public class ApplicationRecordHandler implements RecordHandler<String, Integer>
  13 {
  14   private final Producer<String, Object> producer;
  15   private final String id;
  16   private final String topic;
  17
  18
  19   @Override
  20   public void accept(ConsumerRecord<String, Integer> record)
  21   {
  22     String key = record.key();
  23     int number = record.value();
  24
  25     // TODO: JSON-Nachrichten verschicken
  26   }
  27
  28   private void send(String key, Object value)
  29   {
  30       final long time = System.currentTimeMillis();
  31
  32       final ProducerRecord<String, Object> record = new ProducerRecord<>(
  33           topic,  // Topic
  34           key,    // Key
  35           value   // Value
  36       );
  37
  38       producer.send(record, (metadata, e) ->
  39       {
  40         long now = System.currentTimeMillis();
  41         if (e == null)
  42         {
  43           // HANDLE SUCCESS
  44           log.debug(
  45               "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  46               id,
  47               record.key(),
  48               record.value(),
  49               metadata.partition(),
  50               metadata.offset(),
  51               metadata.timestamp(),
  52               now - time
  53           );
  54         }
  55         else
  56         {
  57           // HANDLE ERROR
  58           log.error(
  59               "{} - ERROR key={} timestamp={} latency={}ms: {}",
  60               id,
  61               record.key(),
  62               metadata == null ? -1 : metadata.timestamp(),
  63               now - time,
  64               e.toString()
  65           );
  66         }
  67       });
  68
  69       long now = System.currentTimeMillis();
  70       log.trace(
  71           "{} - Queued message with key={} latency={}ms",
  72           id,
  73           record.key(),
  74           now - time
  75       );
  76   }
  77 }