juplo.de Git - demos/kafka/demos-kafka-payment-system-transfer/blob - transfer/src/main/java/de/juplo/kafka/payment/transfer/domain/TransferService.java

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