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

   1 package de.juplo.kafka;
   2
   3 import lombok.extern.slf4j.Slf4j;
   4 import org.apache.kafka.clients.producer.KafkaProducer;
   5 import org.apache.kafka.clients.producer.ProducerRecord;
   6 import org.apache.kafka.common.serialization.StringSerializer;
   7 import org.springframework.http.MediaType;
   8 import org.springframework.web.bind.annotation.*;
   9 import org.springframework.web.context.request.async.DeferredResult;
  10
  11 import javax.annotation.PreDestroy;
  12 import java.util.Properties;
  13 import java.util.concurrent.ExecutionException;
  14 import java.util.concurrent.ExecutorService;
  15
  16
  17 @Slf4j
  18 @RestController
  19 public class RestProducer
  20 {
  21   private final String id;
  22   private final String topic;
  23   private final KafkaProducer<String, String> producer;
  24
  25   private long produced = 0;
  26
  27   public RestProducer(ApplicationProperties properties)
  28   {
  29     this.id = properties.getClientId();
  30     this.topic = properties.getTopic();
  31
  32     Properties props = new Properties();
  33     props.put("bootstrap.servers", properties.getBootstrapServer());
  34     props.put("client.id", properties.getClientId());
  35     props.put("acks", properties.getAcks());
  36     props.put("batch.size", properties.getBatchSize());
  37     props.put("delivery.timeout.ms", 20000); // 20 Sekunden
  38     props.put("request.timeout.ms",  10000); // 10 Sekunden
  39     props.put("linger.ms", properties.getLingerMs());
  40     props.put("compression.type", properties.getCompressionType());
  41     props.put("key.serializer", StringSerializer.class.getName());
  42     props.put("value.serializer", StringSerializer.class.getName());
  43
  44     this.producer = new KafkaProducer<>(props);
  45   }
  46
  47   @PostMapping(path = "{key}")
  48   public DeferredResult<ProduceResult> send(
  49       @PathVariable String key,
  50       @RequestBody String value)
  51   {
  52     DeferredResult<ProduceResult> result = new DeferredResult<>();
  53
  54     final long time = System.currentTimeMillis();
  55
  56     final ProducerRecord<String, String> record = new ProducerRecord<>(
  57         topic,  // Topic
  58         key,    // Key
  59         value   // Value
  60     );
  61
  62     producer.send(record, (metadata, e) ->
  63     {
  64       long now = System.currentTimeMillis();
  65       if (e == null)
  66       {
  67         // HANDLE SUCCESS
  68         produced++;
  69         result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
  70         log.debug(
  71             "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  72             id,
  73             record.key(),
  74             record.value(),
  75             metadata.partition(),
  76             metadata.offset(),
  77             metadata.timestamp(),
  78             now - time
  79         );
  80       }
  81       else
  82       {
  83         // HANDLE ERROR
  84         result.setErrorResult(new ProduceFailure(e));
  85         log.error(
  86             "{} - ERROR key={} timestamp={} latency={}ms: {}",
  87             id,
  88             record.key(),
  89             metadata == null ? -1 : metadata.timestamp(),
  90             now - time,
  91             e.toString()
  92         );
  93       }
  94     });
  95
  96     long now = System.currentTimeMillis();
  97     log.trace(
  98         "{} - Queued #{} key={} latency={}ms",
  99         id,
 100         value,
 101         record.key(),
 102         now - time
 103     );
 104
 105     return result;
 106   }
 107
 108   @PreDestroy
 109   public void destroy() throws ExecutionException, InterruptedException
 110   {
 111     log.info("{} - Destroy!", id);
 112     log.info("{} - Closing the KafkaProducer", id);
 113     producer.close();
 114     log.info("{}: Produced {} messages in total, exiting!", id, produced);
 115   }
 116 }