counter: 1.1.2 - Moved configuration into `CounterApplication`

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

diff --git a/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplication.java b/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplication.java
index 1f73d32..1ee65ca 100644 (file)
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplication.java
+++ b/src/main/java/de/juplo/kafka/wordcount/counter/CounterApplication.java
@@ -1,14 +1,62 @@
 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.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+
+import java.util.Properties;
+import java.util.concurrent.CompletableFuture;
+
+import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
 
 
 @SpringBootApplication
 @EnableConfigurationProperties(CounterApplicationProperties.class)
+@Slf4j
 public class CounterApplication
 {
+       @Bean(initMethod = "start", destroyMethod = "stop")
+       public CounterStreamProcessor streamProcessor(
+                       CounterApplicationProperties properties,
+                       ObjectMapper objectMapper,
+                       ConfigurableApplicationContext context)
+       {
+               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(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+
+               CounterStreamProcessor streamProcessor = new CounterStreamProcessor(
+                               properties.getInputTopic(),
+                               properties.getOutputTopic(),
+                               propertyMap,
+                               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;
+       }
+
        public static void main(String[] args)
        {
                SpringApplication.run(CounterApplication.class, args);