926045c75c9e61227bac29f5a3b1cbae2e890aa9
[demos/kafka/wordcount] / src / main / java / de / juplo / kafka / wordcount / counter / CounterApplicationConfiguriation.java
1 package de.juplo.kafka.wordcount.counter;
2
3 import lombok.extern.slf4j.Slf4j;
4 import org.apache.kafka.clients.consumer.ConsumerConfig;
5 import org.apache.kafka.streams.StreamsConfig;
6 import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
7 import org.apache.kafka.streams.state.Stores;
8 import org.springframework.boot.SpringApplication;
9 import org.springframework.boot.context.properties.EnableConfigurationProperties;
10 import org.springframework.context.ConfigurableApplicationContext;
11 import org.springframework.context.annotation.Bean;
12 import org.springframework.context.annotation.Configuration;
13 import org.springframework.kafka.support.serializer.JsonDeserializer;
14 import org.springframework.kafka.support.serializer.JsonSerde;
15
16 import java.util.Properties;
17 import java.util.concurrent.CompletableFuture;
18
19 import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
20
21
22 @Configuration
23 @EnableConfigurationProperties(CounterApplicationProperties.class)
24 @Slf4j
25 public class CounterApplicationConfiguriation
26 {
27         @Bean
28         public Properties streamProcessorProperties(CounterApplicationProperties counterProperties)
29         {
30                 Properties propertyMap = new Properties();
31
32                 propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, counterProperties.getApplicationId());
33                 propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, counterProperties.getBootstrapServer());
34                 propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
35                 propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, JsonSerde.class.getName());
36                 propertyMap.put(JsonDeserializer.TRUSTED_PACKAGES, CounterApplication.class.getPackageName());
37                 propertyMap.put(JsonDeserializer.KEY_DEFAULT_TYPE, Word.class.getName());
38                 propertyMap.put(JsonDeserializer.VALUE_DEFAULT_TYPE, Word.class.getName());
39                 propertyMap.put(
40                                 JsonDeserializer.TYPE_MAPPINGS,
41                                 "word:" + Word.class.getName() + "," +
42                                 "counter:" + WordCounter.class.getName());
43                 propertyMap.put(JsonDeserializer.REMOVE_TYPE_INFO_HEADERS, Boolean.FALSE);
44                 propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
45                 if (counterProperties.getCommitInterval() != null)
46                         propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, counterProperties.getCommitInterval());
47                 if (counterProperties.getCacheMaxBytes() != null)
48                         propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, counterProperties.getCacheMaxBytes());
49                 propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
50
51                 return propertyMap;
52         }
53
54         @Bean(initMethod = "start", destroyMethod = "stop")
55         public CounterStreamProcessor streamProcessor(
56                         CounterApplicationProperties applicationProperties,
57                         Properties streamProcessorProperties,
58                         KeyValueBytesStoreSupplier storeSupplier,
59                         ConfigurableApplicationContext context)
60         {
61                 CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
62                                 applicationProperties.getInputTopic(),
63                                 applicationProperties.getOutputTopic(),
64                                 streamProcessorProperties,
65                                 storeSupplier);
66
67                 streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
68                 {
69                         log.error("Unexpected error!", e);
70                         CompletableFuture.runAsync(() ->
71                         {
72                                 log.info("Stopping application...");
73                                 SpringApplication.exit(context, () -> 1);
74                         });
75                         return SHUTDOWN_CLIENT;
76                 });
77
78
79                 return streamProcessor;
80         }
81
82         @Bean
83         public KeyValueBytesStoreSupplier storeSupplier()
84         {
85                 return Stores.persistentKeyValueStore("counter");
86         }
87 }