1 package de.juplo.kafka;
3 import org.apache.kafka.clients.consumer.Consumer;
4 import org.apache.kafka.clients.consumer.KafkaConsumer;
5 import org.apache.kafka.common.serialization.StringDeserializer;
6 import org.springframework.boot.context.properties.EnableConfigurationProperties;
7 import org.springframework.context.annotation.Bean;
8 import org.springframework.context.annotation.Configuration;
9 import org.springframework.kafka.support.serializer.JsonDeserializer;
11 import java.time.Clock;
12 import java.util.Optional;
13 import java.util.Properties;
14 import java.util.concurrent.ExecutorService;
15 import java.util.concurrent.Executors;
19 @EnableConfigurationProperties(ApplicationProperties.class)
20 public class ApplicationConfiguration
23 public ApplicationRecordHandler recordHandler(
24 AdderResults adderResults,
25 ApplicationProperties properties)
27 return new ApplicationRecordHandler(
29 Optional.ofNullable(properties.getThrottle()),
30 properties.getClientId());
34 public AdderResults adderResults()
36 return new AdderResults();
40 public ApplicationRebalanceListener rebalanceListener(
41 ApplicationRecordHandler recordHandler,
42 AdderResults adderResults,
43 StateRepository stateRepository,
44 Consumer<String, Message> consumer,
45 ApplicationProperties properties)
47 return new ApplicationRebalanceListener(
51 properties.getClientId(),
52 properties.getTopic(),
53 Clock.systemDefaultZone(),
54 properties.getCommitInterval(),
59 public EndlessConsumer<String, Message> endlessConsumer(
60 KafkaConsumer<String, Message> kafkaConsumer,
61 ExecutorService executor,
62 ApplicationRebalanceListener rebalanceListener,
63 ApplicationRecordHandler recordHandler,
64 ApplicationProperties properties)
67 new EndlessConsumer<>(
69 properties.getClientId(),
70 properties.getTopic(),
77 public ExecutorService executor()
79 return Executors.newSingleThreadExecutor();
82 @Bean(destroyMethod = "close")
83 public KafkaConsumer<String, Message> kafkaConsumer(ApplicationProperties properties)
85 Properties props = new Properties();
87 props.put("bootstrap.servers", properties.getBootstrapServer());
88 props.put("partition.assignment.strategy", "org.apache.kafka.clients.consumer.CooperativeStickyAssignor");
89 props.put("group.id", properties.getGroupId());
90 props.put("client.id", properties.getClientId());
91 props.put("enable.auto.commit", false);
92 props.put("auto.offset.reset", properties.getAutoOffsetReset());
93 props.put("metadata.max.age.ms", "1000");
94 props.put("key.deserializer", StringDeserializer.class.getName());
95 props.put("value.deserializer", JsonDeserializer.class.getName());
96 props.put(JsonDeserializer.TRUSTED_PACKAGES, "de.juplo.kafka");
97 props.put(JsonDeserializer.TYPE_MAPPINGS,
98 Message.Type.ADD + ":" + MessageAddNumber.class.getName() + "," +
99 Message.Type.CALC + ":" + MessageCalculateSum.class.getName());
101 return new KafkaConsumer<>(props);