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("linger.ms", properties.getLingerMs());
  38     props.put("compression.type", properties.getCompressionType());
  39     props.put("key.serializer", StringSerializer.class.getName());
  40     props.put("value.serializer", StringSerializer.class.getName());
  41
  42     this.producer = new KafkaProducer<>(props);
  43   }
  44
  45   @PostMapping(path = "{key}")
  46   public DeferredResult<ProduceResult> send(
  47       @PathVariable String key,
  48       @RequestBody String value)
  49   {
  50     DeferredResult<ProduceResult> result = new DeferredResult<>();
  51
  52     final long time = System.currentTimeMillis();
  53
  54     final ProducerRecord<String, String> record = new ProducerRecord<>(
  55         topic,  // Topic
  56         key,    // Key
  57         value   // Value
  58     );
  59
  60     producer.send(record, (metadata, e) ->
  61     {
  62       long now = System.currentTimeMillis();
  63       if (e == null)
  64       {
  65         // HANDLE SUCCESS
  66         produced++;
  67         result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
  68         log.debug(
  69             "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  70             id,
  71             record.key(),
  72             record.value(),
  73             metadata.partition(),
  74             metadata.offset(),
  75             metadata.timestamp(),
  76             now - time
  77         );
  78       }
  79       else
  80       {
  81         // HANDLE ERROR
  82         result.setErrorResult(new ProduceFailure(e));
  83         log.error(
  84             "{} - ERROR key={} timestamp={} latency={}ms: {}",
  85             id,
  86             record.key(),
  87             metadata == null ? -1 : metadata.timestamp(),
  88             now - time,
  89             e.toString()
  90         );
  91       }
  92     });
  93
  94     long now = System.currentTimeMillis();
  95     log.trace(
  96         "{} - Queued #{} key={} latency={}ms",
  97         id,
  98         value,
  99         record.key(),
 100         now - time
 101     );
 102
 103     return result;
 104   }
 105
 106   @PreDestroy
 107   public void destroy() throws ExecutionException, InterruptedException
 108   {
 109     log.info("{} - Destroy!", id);
 110     log.info("{} - Closing the KafkaProducer", id);
 111     producer.close();
 112     log.info("{}: Produced {} messages in total, exiting!", id, produced);
 113   }
 114 }