X-Git-Url: https://juplo.de/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fsplitter%2FSplitterStreamProcessor.java;fp=src%2Fmain%2Fjava%2Fde%2Fjuplo%2Fkafka%2Fwordcount%2Fsplitter%2FSplitterStreamProcessor.java;h=7218d6f2e94e44e5338de1d55854a9ed7255eeaa;hb=3bc3ef7ceb76e7643e1e373293cfdc78f870838a;hp=0000000000000000000000000000000000000000;hpb=b1623c2b645c614424ceec3bc71008c900d82115;p=demos%2Fkafka%2Fwordcount

diff --git a/src/main/java/de/juplo/kafka/wordcount/splitter/SplitterStreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/splitter/SplitterStreamProcessor.java
new file mode 100644
index 0000000..7218d6f
--- /dev/null
+++ b/src/main/java/de/juplo/kafka/wordcount/splitter/SplitterStreamProcessor.java
@@ -0,0 +1,77 @@
+package de.juplo.kafka.wordcount.splitter;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.common.serialization.Serdes;
+import org.apache.kafka.streams.KafkaStreams;
+import org.apache.kafka.streams.StreamsBuilder;
+import org.apache.kafka.streams.StreamsConfig;
+import org.apache.kafka.streams.kstream.KStream;
+import org.springframework.boot.SpringApplication;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.stereotype.Component;
+
+import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
+import java.util.Arrays;
+import java.util.Properties;
+import java.util.concurrent.CompletableFuture;
+import java.util.regex.Pattern;
+
+import static org.apache.kafka.streams.errors.StreamsUncaughtExceptionHandler.StreamThreadExceptionResponse.SHUTDOWN_CLIENT;
+
+
+@Slf4j
+@Component
+public class SplitterStreamProcessor
+{
+	final static Pattern PATTERN = Pattern.compile("\\W+");
+
+	public final KafkaStreams streams;
+
+
+	public SplitterStreamProcessor(
+			SplitterApplicationProperties properties,
+			ConfigurableApplicationContext context)
+	{
+		StreamsBuilder builder = new StreamsBuilder();
+
+		KStream<String, String> source = builder.stream(properties.getInputTopic());
+		source
+				.flatMapValues(sentence -> Arrays.asList(PATTERN.split(sentence)))
+				.to(properties.getOutputTopic());
+
+		Properties props = new Properties();
+		props.put(StreamsConfig.APPLICATION_ID_CONFIG, properties.getApplicationId());
+		props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, properties.getBootstrapServer());
+		props.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
+		props.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
+		props.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
+
+		streams = new KafkaStreams(builder.build(), props);
+		streams.setUncaughtExceptionHandler((Throwable e) ->
+		{
+			log.error("Unexpected error!", e);
+			CompletableFuture.runAsync(() ->
+			{
+				log.info("Stopping application...");
+				SpringApplication.exit(context, () -> 1);
+			});
+			return SHUTDOWN_CLIENT;
+		});
+	}
+
+	@PostConstruct
+	public void start()
+	{
+		log.info("Starting Stream-Processor");
+		streams.start();
+	}
+
+	@PreDestroy
+	public void stop()
+	{
+		log.info("Stopping Stream-Processor");
+		streams.close();
+	}
+}