juplo.de Git - demos/kafka/demos-kafka-payment-system-transfer/blob - transfer/src/main/java/de/juplo/kafka/payment/transfer/impl/TransferServiceImpl.java

   1 package de.juplo.kafka.payment.transfer.impl;
   2
   3
   4 import com.fasterxml.jackson.databind.ObjectMapper;
   5 import de.juplo.kafka.payment.transfer.api.Transfer;
   6 import de.juplo.kafka.payment.transfer.api.TransferService;
   7 import de.juplo.kafka.payment.transfer.persistence.TransferRepository;
   8 import lombok.RequiredArgsConstructor;
   9 import lombok.extern.slf4j.Slf4j;
  10 import org.apache.kafka.clients.producer.KafkaProducer;
  11 import org.apache.kafka.clients.producer.ProducerRecord;
  12 import org.springframework.http.ResponseEntity;
  13 import org.springframework.web.bind.annotation.RequestBody;
  14 import org.springframework.web.context.request.async.DeferredResult;
  15
  16 import javax.validation.Valid;
  17 import java.net.URI;
  18 import java.util.UUID;
  19
  20
  21 @Slf4j
  22 @RequiredArgsConstructor
  23 public class TransferServiceImpl implements TransferService
  24 {
  25   private final TransferRepository repository;
  26   private final KafkaProducer<UUID, String> producer;
  27   private final ObjectMapper mapper;
  28   private final String topic;
  29
  30
  31   @Override
  32   public void initiate(Transfer transfer)
  33   {
  34     repository
  35         .get(transfer.getId())
  36         .ifPresentOrElse(
  37             stored ->
  38             {
  39
  40             },
  41             () ->
  42             {
  43
  44             });
  45     try
  46     {
  47       ProducerRecord<UUID, String> record =
  48           new ProducerRecord<>(
  49               topic,
  50               transfer.getId(),
  51               mapper.writeValueAsString(transfer));
  52
  53       producer.send(record, (metadata, exception) ->
  54       {
  55         if (exception != null)
  56         {
  57           log.error("Could not place order {}: {}", transfer, exception.toString());
  58           result.setErrorResult(exception);
  59           return;
  60         }
  61
  62         result.setResult(ResponseEntity.created(URI.create(path + transfer.getId())).build());
  63       });
  64     }
  65     catch (Exception e)
  66     {
  67       log.error("Unexpected exception!", e);
  68       result.setErrorResult(e);
  69     }
  70
  71     return result;
  72   }
  73 }