remove empty module

apache-kafka/src/test/java/com/baeldung/kafkastreams/KafkaStreamsLiveTest.java

@@ -1,5 +1,9 @@
 package com.baeldung.kafkastreams;
 
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.Arrays;
 import java.util.Properties;
 import java.util.regex.Pattern;
@@ -18,59 +22,57 @@ import org.junit.Test;
 
 public class KafkaStreamsLiveTest {
     private String bootstrapServers = "localhost:9092";
+    private Path stateDirectory;
 
     @Test
     @Ignore("it needs to have kafka broker running on local")
     public void shouldTestKafkaStreams() throws InterruptedException {
-        //given
+        // given
         String inputTopic = "inputTopic";
 
         Properties streamsConfiguration = new Properties();
         streamsConfiguration.put(StreamsConfig.APPLICATION_ID_CONFIG, "wordcount-live-test");
         streamsConfiguration.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers);
-        streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
+        streamsConfiguration.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String()
-        streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass().getName());
+            .getClass()
+            .getName());
+        streamsConfiguration.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String()
+            .getClass()
+            .getName());
         streamsConfiguration.put(StreamsConfig.COMMIT_INTERVAL_MS_CONFIG, 1000);
         streamsConfiguration.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
-        // Use a temporary directory for storing state, which will be automatically removed after the test.
-      //  streamsConfiguration.put(StreamsConfig.STATE_DIR_CONFIG, TestUtils.tempDirectory().getAbsolutePath());
         
-        /*
+        // Use a temporary directory for storing state, which will be automatically removed after the test.
-         * final StreamsBuilder builder = new StreamsBuilder();
+        try {
-        KStream<String, String> textLines = builder.stream(wordCountTopic,
+            this.stateDirectory = Files.createTempDirectory("kafka-streams");
-          Consumed.with(Serdes.String(), Serdes.String()));
+            streamsConfiguration.put(StreamsConfig.STATE_DIR_CONFIG, this.stateDirectory.toAbsolutePath()
+                .toString());
+        } catch (final IOException e) {
+            throw new UncheckedIOException("Cannot create temporary directory", e);
+        }
 
-        KTable<String, Long> wordCounts = textLines
+        // when
-          .flatMapValues(value -> Arrays.asList(value.toLowerCase(Locale.ROOT)
-            .split("\\W+")))
-          .groupBy((key, word) -> word)
-          .count(Materialized.<String, Long, KeyValueStore<Bytes, byte[]>> as("counts-store"));
-         */
-        //when
         final StreamsBuilder builder = new StreamsBuilder();
         KStream<String, String> textLines = builder.stream(inputTopic);
         Pattern pattern = Pattern.compile("\\W+", Pattern.UNICODE_CHARACTER_CLASS);
 
-        KTable<String, Long> wordCounts = textLines
+        KTable<String, Long> wordCounts = textLines.flatMapValues(value -> Arrays.asList(pattern.split(value.toLowerCase())))
-                .flatMapValues(value -> Arrays.asList(pattern.split(value.toLowerCase())))
+            .groupBy((key, word) -> word)
-                .groupBy((key, word) -> word)
+            .count();
-                .count();
 
-        wordCounts.toStream().foreach((word, count) -> System.out.println("word: " + word + " -> " + count));
+        wordCounts.toStream()
+            .foreach((word, count) -> System.out.println("word: " + word + " -> " + count));
 
         String outputTopic = "outputTopic";
-        //final Serde<String> stringSerde = Serdes.String();
+
-        //final Serde<Long> longSerde = Serdes.Long();
+        wordCounts.toStream()
-        //wordCounts.toStream().to(stringSerde, longSerde, outputTopic);
+            .to(outputTopic, Produced.with(Serdes.String(), Serdes.Long()));
-        
-        wordCounts.toStream().to("outputTopic",
-            Produced.with(Serdes.String(), Serdes.Long()));
 
         final Topology topology = builder.build();
         KafkaStreams streams = new KafkaStreams(topology, streamsConfiguration);
         streams.start();
 
-        //then
+        // then
         Thread.sleep(30000);
         streams.close();
     }

libraries-data-3/README.md

@@ -1,9 +0,0 @@
-## Data Libraries
-
-This module contains articles about libraries for data processing in Java.
-
-### Relevant articles
-
-
-##### Building the project
-You can build the project from the command line using: *mvn clean install*, or in an IDE. 

libraries-data-3/pom.xml

@@ -1,21 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <artifactId>libraries-data-3</artifactId>
-    <name>libraries-data-3</name>
-
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
-    </parent>
-
-    <dependencies>
-    </dependencies>
-
-    <properties>
-    </properties>
-
-</project>