counter: 1.1.10 - Refactored the configuration inito a separated class

[demos/kafka/wordcount] / src / main / java / de / juplo / kafka / wordcount / counter / CounterApplicationConfiguriation.java

diff --git a/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplicationConfiguriation.java b/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplicationConfiguriation.java
new file mode 100644 (file)
index 0000000..f1da407
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplicationConfiguriation.java
@@ -0,0 +1,81 @@
+package de.juplo.kafka.wordcount.counter;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.common.serialization.Serdes;
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.state.KeyValueBytesStoreSupplier;
+import org.apache.kafka.streams.state.Stores;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import java.util.Properties;
+import java.util.concurrent.CompletableFuture;
+
+import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
+
+
+@Configuration
+@EnableConfigurationProperties(CounterApplicationProperties.class)
+@Slf4j
+public class CounterApplicationConfiguriation
+{
+       @Bean
+       public Properties propertyMap(CounterApplicationProperties properties)
+       {
+               Properties propertyMap = new Properties();
+
+               propertyMap.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
+               propertyMap.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
+               propertyMap.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
+               propertyMap.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.StringSerde.class.getName());
+               propertyMap.put(StreamsConfig.STATE_DIR_CONFIG, "target");
+               if (properties.getCommitInterval() != null)
+                       propertyMap.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, properties.getCommitInterval());
+               if (properties.getCacheMaxBytes() != null)
+                       propertyMap.put(StreamsConfig.CACHE_MAX_BYTES_BUFFERING_CONFIG, properties.getCacheMaxBytes());
+               propertyMap.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+
+               return propertyMap;
+       }
+
+       @Bean(initMethod = "start", destroyMethod = "stop")
+       public CounterStreamProcessor streamProcessor(
+                       CounterApplicationProperties properties,
+                       Properties propertyMap,
+                       KeyValueBytesStoreSupplier storeSupplier,
+                       ObjectMapper objectMapper,
+                       ConfigurableApplicationContext context)
+       {
+               CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
+                               properties.getInputTopic(),
+                               properties.getOutputTopic(),
+                               propertyMap,
+                               storeSupplier,
+                               objectMapper);
+
+               streamProcessor.streams.setUncaughtExceptionHandler((Throwable e) ->
+               {
+                       log.error("Unexpected error!", e);
+                       CompletableFuture.runAsync(() ->
+                       {
+                               log.info("Stopping application...");
+                               SpringApplication.exit(context, () -> 1);
+                       });
+                       return SHUTDOWN_CLIENT;
+               });
+
+
+               return streamProcessor;
+       }
+
+       @Bean
+       public KeyValueBytesStoreSupplier storeSupplier()
+       {
+               return Stores.persistentKeyValueStore("counter");
+       }
+}