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

   1 package de.juplo.kafka;
   2
   3 import lombok.RequiredArgsConstructor;
   4 import lombok.extern.slf4j.Slf4j;
   5 import org.apache.kafka.clients.producer.Producer;
   6 import org.apache.kafka.clients.producer.KafkaProducer;
   7 import org.apache.kafka.clients.producer.ProducerRecord;
   8 import org.springframework.http.HttpStatus;
   9 import org.springframework.web.bind.annotation.*;
  10 import org.springframework.web.context.request.async.DeferredResult;
  11
  12 import java.math.BigInteger;
  13
  14
  15 @Slf4j
  16 @RequestMapping
  17 @ResponseBody
  18 @RequiredArgsConstructor
  19 public class RestProducer
  20 {
  21   private final String id;
  22   private final String topic;
  23   private final Integer partition;
  24   private final Producer<String, String> producer;
  25
  26   private long produced = 0;
  27
  28   @PostMapping(path = "{key}")
  29   public DeferredResult<ProduceResult> send(
  30       @PathVariable String key,
  31       @RequestHeader(name = "X-id", required = false) Long correlationId,
  32       @RequestBody String value)
  33   {
  34     DeferredResult<ProduceResult> result = new DeferredResult<>();
  35
  36     final long time = System.currentTimeMillis();
  37
  38     final ProducerRecord<String, String> record = new ProducerRecord<>(
  39         topic,  // Topic
  40         partition, // Partition
  41         key,    // Key
  42         value   // Value
  43     );
  44
  45     producer.send(record, (metadata, e) ->
  46     {
  47       long now = System.currentTimeMillis();
  48       if (e == null)
  49       {
  50         // HANDLE SUCCESS
  51         produced++;
  52         result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
  53         log.debug(
  54             "{} - Sent key={} message={} partition={}/{} timestamp={} latency={}ms",
  55             id,
  56             record.key(),
  57             record.value(),
  58             metadata.partition(),
  59             metadata.offset(),
  60             metadata.timestamp(),
  61             now - time
  62         );
  63       }
  64       else
  65       {
  66         // HANDLE ERROR
  67         result.setErrorResult(new ProduceFailure(e));
  68         log.error(
  69             "{} - ERROR key={} timestamp={} latency={}ms: {}",
  70             id,
  71             record.key(),
  72             metadata == null ? -1 : metadata.timestamp(),
  73             now - time,
  74             e.toString()
  75         );
  76       }
  77     });
  78
  79     long now = System.currentTimeMillis();
  80     log.trace(
  81         "{} - Queued message with key={} latency={}ms",
  82         id,
  83         record.key(),
  84         now - time
  85     );
  86
  87     return result;
  88   }
  89
  90   @ExceptionHandler
  91   @ResponseStatus(HttpStatus.BAD_REQUEST)
  92   public ErrorResponse illegalStateException(IllegalStateException e)
  93   {
  94     return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
  95   }
  96 }