juplo.de Git - demos/microservices/blob - validate-user/src/main/java/de/trion/microservices/validateuser/ValidateUserService.java

   1 package de.trion.microservices.validateuser;
   2
   3
   4 import de.trion.microservices.avro.Order;
   5 import de.trion.microservices.avro.OrderState;
   6 import de.trion.microservices.avro.OrderValidation;
   7 import static de.trion.microservices.avro.OrderValidationResult.FAIL;
   8 import static de.trion.microservices.avro.OrderValidationResult.PASS;
   9 import static de.trion.microservices.avro.OrderValidationType.ORDER_DETAILS_CHECK;
  10 import io.confluent.kafka.streams.serdes.avro.SpecificAvroSerde;
  11 import java.util.LinkedList;
  12 import java.util.List;
  13 import java.util.Properties;
  14 import javax.annotation.PostConstruct;
  15 import javax.annotation.PreDestroy;
  16 import org.apache.kafka.common.serialization.Serdes;
  17 import org.apache.kafka.streams.KafkaStreams;
  18 import org.apache.kafka.streams.StreamsBuilder;
  19 import org.apache.kafka.streams.Topology;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22 import org.springframework.stereotype.Component;
  23
  24
  25 @Component
  26 public class ValidateUserService
  27 {
  28   final static Logger LOG = LoggerFactory.getLogger(ValidateUserService.class);
  29
  30   private final String orders;
  31   private final String validation;
  32   private final KafkaStreams streams;
  33
  34
  35   public ValidateUserService(ApplicationProperties config)
  36   {
  37     orders = config.ordersTopic;
  38     validation = config.validationTopic;
  39
  40     Properties properties = new Properties();
  41     properties.put("bootstrap.servers", config.bootstrapServers);
  42     properties.put("application.id", "validate-user");
  43     properties.put("schema.registry.url", config.schemaRegistryUrl);
  44     properties.put("default.key.serde", Serdes.String().getClass());
  45     properties.put("default.value.serde", SpecificAvroSerde.class);
  46
  47     StreamsBuilder builder = new StreamsBuilder();
  48
  49     Topology topology = builder.build();
  50     streams = new KafkaStreams(topology, properties);
  51     streams.setUncaughtExceptionHandler((Thread t, Throwable e) ->
  52     {
  53       LOG.error("Unexpected error in thread {}: {}", t, e.toString());
  54       try
  55       {
  56         streams.close();
  57       }
  58       catch (Exception ex)
  59       {
  60         LOG.error("Could not close KafkaStreams!", ex);
  61       }
  62     });
  63   }
  64
  65
  66   @PostConstruct
  67   public void start()
  68   {
  69     streams.start();
  70   }
  71
  72   @PreDestroy
  73   public void stop()
  74   {
  75     streams.close();
  76   }
  77 }