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.KafkaProducer;
   6 import org.apache.kafka.clients.producer.ProducerRecord;
   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.concurrent.ExecutionException;
  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 KafkaProducer<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         key,    // Key
  41         value   // Value
  42     );
  43
  44     // TODO: Nachricht versenden und Feedback geben
  45     // Tipp:
  46     // result.setResult(new ProduceSuccess(metadata.partition(), metadata.offset()));
  47     // result.setErrorResult(new ProduceFailure(e));
  48
  49     return result;
  50   }
  51
  52   @ExceptionHandler
  53   @ResponseStatus(HttpStatus.BAD_REQUEST)
  54   public ErrorResponse illegalStateException(IllegalStateException e)
  55   {
  56     return new ErrorResponse(e.getMessage(), HttpStatus.BAD_REQUEST.value());
  57   }
  58 }