1 package de.juplo.kafka;
3 import org.apache.kafka.clients.consumer.KafkaConsumer;
4 import org.apache.kafka.common.serialization.StringDeserializer;
5 import org.springframework.boot.context.properties.EnableConfigurationProperties;
6 import org.springframework.context.annotation.Bean;
7 import org.springframework.context.annotation.Configuration;
8 import org.springframework.kafka.support.serializer.JsonDeserializer;
10 import java.util.Optional;
11 import java.util.Properties;
12 import java.util.concurrent.ExecutorService;
13 import java.util.concurrent.Executors;
17 @EnableConfigurationProperties(ApplicationProperties.class)
18 public class ApplicationConfiguration
21 public ApplicationRecordHandler recordHandler(
22 AdderResults adderResults,
23 ApplicationProperties properties)
25 return new ApplicationRecordHandler(
27 Optional.ofNullable(properties.getThrottle()),
28 properties.getClientId());
32 public AdderResults adderResults()
34 return new AdderResults();
38 public ApplicationRebalanceListener rebalanceListener(
39 ApplicationRecordHandler recordHandler,
40 AdderResults adderResults,
41 StateRepository stateRepository,
42 ApplicationProperties properties)
44 return new ApplicationRebalanceListener(
48 properties.getClientId());
52 public EndlessConsumer<String, Message> endlessConsumer(
53 KafkaConsumer<String, Message> kafkaConsumer,
54 ExecutorService executor,
55 ApplicationRebalanceListener rebalanceListener,
56 ApplicationRecordHandler recordHandler,
57 ApplicationProperties properties)
60 new EndlessConsumer<>(
62 properties.getClientId(),
63 properties.getTopic(),
70 public ExecutorService executor()
72 return Executors.newSingleThreadExecutor();
75 @Bean(destroyMethod = "close")
76 public KafkaConsumer<String, Message> kafkaConsumer(ApplicationProperties properties)
78 Properties props = new Properties();
80 props.put("bootstrap.servers", properties.getBootstrapServer());
81 props.put("partition.assignment.strategy", "org.apache.kafka.clients.consumer.StickyAssignor");
82 props.put("group.id", properties.getGroupId());
83 props.put("client.id", properties.getClientId());
84 props.put("auto.offset.reset", properties.getAutoOffsetReset());
85 props.put("auto.commit.interval.ms", (int)properties.getCommitInterval().toMillis());
86 props.put("metadata.max.age.ms", "1000");
87 props.put("key.deserializer", StringDeserializer.class.getName());
88 props.put("value.deserializer", JsonDeserializer.class.getName());
89 props.put(JsonDeserializer.TRUSTED_PACKAGES, "de.juplo.kafka");
90 props.put(JsonDeserializer.TYPE_MAPPINGS,
91 Message.Type.ADD + ":" + MessageAddNumber.class.getName() + "," +
92 Message.Type.CALC + ":" + MessageCalculateSum.class.getName());
94 return new KafkaConsumer<>(props);