top10:1.0.0 - ranks first 10 mostly used words, keyed by user

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

diff --git a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java b/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
deleted file mode 100644 (file)
index e8d7c11..0000000
--- a/src/main/java/de/juplo/kafka/wordcount/counter/CounterStreamProcessor.java
+++ /dev/null
@@ -1,97 +0,0 @@
-package de.juplo.kafka.wordcount.counter;
-
-import com.fasterxml.jackson.core.JsonProcessingException;
-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.KafkaStreams;
-import org.apache.kafka.streams.KeyValue;
-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 CounterStreamProcessor
-{
-       final static Pattern PATTERN = Pattern.compile("\\W+");
-
-       public final KafkaStreams streams;
-
-
-       public CounterStreamProcessor(
-                       CounterApplicationProperties properties,
-                       ObjectMapper mapper,
-                       ConfigurableApplicationContext context)
-       {
-               StreamsBuilder builder = new StreamsBuilder();
-
-               KStream<String, String> source = builder.stream(properties.getInputTopic());
-               source
-                               .flatMapValues(sentence -> Arrays.asList(PATTERN.split(sentence)))
-                               .map((username, word) ->
-                               {
-                                       try
-                                       {
-                                               String key = mapper.writeValueAsString(Key.of(username, word));
-                                               return new KeyValue<>(key, word);
-                                       }
-                                       catch (JsonProcessingException e)
-                                       {
-                                               throw new RuntimeException(e);
-                                       }
-                               })
-                               .groupByKey()
-                               .count()
-                               .mapValues(value->Long.toString(value))
-                               .toStream()
-                               .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();
-       }
-}