1 package de.trion.microservices.validationresults;
4 import de.trion.microservices.avro.Order;
5 import de.trion.microservices.avro.OrderState;
6 import static de.trion.microservices.avro.OrderState.APPROVED;
7 import static de.trion.microservices.avro.OrderState.DECLINED;
8 import de.trion.microservices.avro.OrderValidation;
9 import static de.trion.microservices.avro.OrderValidationResult.PASS;
10 import io.confluent.kafka.streams.serdes.avro.SpecificAvroSerde;
11 import java.time.Duration;
12 import java.util.Properties;
13 import javax.annotation.PostConstruct;
14 import javax.annotation.PreDestroy;
15 import org.apache.kafka.common.serialization.Serdes;
16 import org.apache.kafka.streams.KafkaStreams;
17 import org.apache.kafka.streams.StreamsBuilder;
18 import org.apache.kafka.streams.Topology;
19 import org.apache.kafka.streams.kstream.JoinWindows;
20 import org.slf4j.Logger;
21 import org.slf4j.LoggerFactory;
22 import org.springframework.stereotype.Component;
26 public class ValidationResultsService
28 final static Logger LOG = LoggerFactory.getLogger(ValidationResultsService.class);
30 private final String orders;
31 private final String validation;
32 private final KafkaStreams streams;
35 public ValidationResultsService(ApplicationProperties config)
37 orders = config.ordersTopic;
38 validation = config.validationTopic;
40 Properties properties = new Properties();
41 properties.put("bootstrap.servers", config.bootstrapServers);
42 properties.put("application.id", "validation-results");
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);
47 StreamsBuilder builder = new StreamsBuilder();
49 .<String,Order>stream(orders)
50 .filter((id, order) -> order.getState() == OrderState.CREATED)
52 builder.<String,OrderValidation>stream(validation),
58 .setState(outcome.getValidationResult() == PASS ? APPROVED : DECLINED)
61 JoinWindows.of(Duration.ofHours(1)))
64 Topology topology = builder.build();
65 streams = new KafkaStreams(topology, properties);
66 streams.setUncaughtExceptionHandler((Thread t, Throwable e) ->
68 LOG.error("Unexpected error in thread {}: {}", t, e.toString());
75 LOG.error("Could not close KafkaStreams!", ex);