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.HttpStatus;
   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
  15
  16 @Slf4j
  17 @RestController
  18 public class RestProducer
  19 {
  20   private final String id;
  21   private final String topic;
  22   private final Integer partition;
  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     this.partition = properties.getPartition();
  32
  33     Properties props = new Properties();
  34     props.put("bootstrap.servers", properties.getBootstrapServer());
  35     props.put("client.id", properties.getClientId());
  36     props.put("acks", properties.getAcks());
  37     props.put("batch.size", properties.getBatchSize());
  38     props.put("delivery.timeout.ms", 20000); // 20 Sekunden
  39     props.put("request.timeout.ms",  10000); // 10 Sekunden
  40     props.put("linger.ms", properties.getLingerMs());
  41     props.put("compression.type", properties.getCompressionType());
  42     props.put("key.serializer", StringSerializer.class.getName());
  43     props.put("value.serializer", StringSerializer.class.getName());
  44
  45     this.producer = new KafkaProducer<>(props);
  46   }
  47
  48   @PostMapping(path = "{key}")
  49   public DeferredResult<ProduceResult> send(
  50       @PathVariable String key,
  51       @RequestHeader(name = "X-id", required = false) Long correlationId,
  52       @RequestBody String value)
  53   {
  54     DeferredResult<ProduceResult> result = new DeferredResult<>();
  55
  56     final long time = System.currentTimeMillis();
  57
  58     final ProducerRecord<String, String> record = new ProducerRecord<>(
  59         topic,  // Topic
  60         key,    // Key
  61         value   // Value
  62     );
  63
  64     producer.send(record, (metadata, e) ->
  65     {
  66       long now = System.currentTimeMillis();
  67       if (e == null)
  68       {
  69         // HANDLE SUCCESS
  70         produced++;
  71         result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
  72         log.debug(
  73             "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  74             id,
  75             record.key(),
  76             record.value(),
  77             metadata.partition(),
  78             metadata.offset(),
  79             metadata.timestamp(),
  80             now - time
  81         );
  82       }
  83       else
  84       {
  85         // HANDLE ERROR
  86         result.setErrorResult(new ProduceFailure(e));
  87         log.error(
  88             "{} - ERROR key={} timestamp={} latency={}ms: {}",
  89             id,
  90             record.key(),
  91             metadata == null ? -1 : metadata.timestamp(),
  92             now - time,
  93             e.toString()
  94         );
  95       }
  96     });
  97
  98     long now = System.currentTimeMillis();
  99     log.trace(
 100         "{} - Queued #{} key={} latency={}ms",
 101         id,
 102         value,
 103         record.key(),
 104         now - time
 105     );
 106
 107     return result;
 108   }
 109
 110   @ExceptionHandler
 111   @ResponseStatus(HttpStatus.BAD_REQUEST)
 112   public ErrorResponse illegalStateException(IllegalStateException e)
 113   {
 114     return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
 115   }
 116
 117   @PreDestroy
 118   public void destroy() throws ExecutionException, InterruptedException
 119   {
 120     log.info("{} - Destroy!", id);
 121     log.info("{} - Closing the KafkaProducer", id);
 122     producer.close();
 123     log.info("{}: Produced {} messages in total, exiting!", id, produced);
 124   }
 125 }