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 synchronized void initiate(Transfer transfer)
  25   {
  26     repository
  27         .get(transfer.getId())
  28         .ifPresentOrElse(
  29             stored ->
  30             {
  31               switch (stored.getState())
  32               {
  33                 case FAILED:
  34               }
  35             },
  36             () ->
  37             {
  38             });
  39   }
  40
  41
  42   private void create(Transfer transfer)
  43   {
  44     try
  45     {
  46       ProducerRecord<UUID, String> record =
  47           new ProducerRecord<>(
  48               topic,
  49               transfer.getId(),
  50               mapper.writeValueAsString(transfer));
  51
  52       producer.send(record, (metadata, exception) ->
  53       {
  54         if (exception != null)
  55         {
  56           log.error("Could not place order {}: {}", transfer, exception.toString());
  57           result.setErrorResult(exception);
  58           return;
  59         }
  60
  61         result.setResult(ResponseEntity.created(URI.create(path + transfer.getId())).build());
  62       });
  63     }
  64     catch (Exception e)
  65     {
  66       log.error("Unexpected exception!", e);
  67       result.setErrorResult(e);
  68     }
  69
  70     return result;
  71   }
  72 }