Update README.md

hazelcast/README.md

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+## Hazelcast
+
+This module contains articles about Hazelcast
+
+### Relevant Articles:
+- [Guide to Hazelcast with Java](https://www.baeldung.com/java-hazelcast)
+- [Introduction to Hazelcast Jet](https://www.baeldung.com/hazelcast-jet)

hazelcast/pom.xml

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+<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>hazelcast</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>hazelcast</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <!-- Hazelcast Jet -->
+		<dependency>
+          <groupId>com.hazelcast.jet</groupId>
+          <artifactId>hazelcast-jet</artifactId>
+          <version>${hazelcast.jet.version}</version>
+		</dependency>
+    </dependencies>
+
+    <build>
+        <finalName>hazelcast</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <!-- hazelcast jet-->
+        <hazelcast.jet.version>0.6</hazelcast.jet.version>
+    </properties>
+
+</project>

hazelcast/src/main/java/com/baeldung/hazelcast/cluster/NativeClient.java

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+package com.baeldung.hazelcast.cluster;
+
+import java.util.Map.Entry;
+
+import com.hazelcast.client.HazelcastClient;
+import com.hazelcast.client.config.ClientConfig;
+import com.hazelcast.config.GroupConfig;
+import com.hazelcast.core.HazelcastInstance;
+import com.hazelcast.core.IMap;
+
+public class NativeClient {
+
+    public static void main(String[] args) throws InterruptedException {
+        ClientConfig config = new ClientConfig();
+        GroupConfig groupConfig = config.getGroupConfig();
+        groupConfig.setName("dev");
+        groupConfig.setPassword("dev-pass");
+        HazelcastInstance hazelcastInstanceClient = HazelcastClient.newHazelcastClient(config);
+        IMap<Long, String> map = hazelcastInstanceClient.getMap("data");
+        for (Entry<Long, String> entry : map.entrySet()) {
+            System.out.println(String.format("Key: %d, Value: %s", entry.getKey(), entry.getValue()));
+        }
+    }
+}

hazelcast/src/main/java/com/baeldung/hazelcast/cluster/ServerNode.java

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+package com.baeldung.hazelcast.cluster;
+
+import java.util.Map;
+
+import com.hazelcast.core.Hazelcast;
+import com.hazelcast.core.HazelcastInstance;
+import com.hazelcast.core.IdGenerator;
+
+public class ServerNode {
+
+    public static void main(String[] args) {
+        HazelcastInstance hazelcastInstance = Hazelcast.newHazelcastInstance();
+        Map<Long, String> map = hazelcastInstance.getMap("data");
+        IdGenerator idGenerator = hazelcastInstance.getIdGenerator("newid");
+        for (int i = 0; i < 10; i++) {
+            map.put(idGenerator.newId(), "message" + 1);
+        }
+    }
+}

hazelcast/src/main/java/com/baeldung/hazelcast/jet/WordCounter.java

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+package com.baeldung.hazelcast.jet;
+
+import java.util.List;
+import java.util.Map;
+
+import static com.hazelcast.jet.Traversers.traverseArray;
+import static com.hazelcast.jet.aggregate.AggregateOperations.counting;
+import static com.hazelcast.jet.function.DistributedFunctions.wholeItem;
+
+import com.hazelcast.jet.Jet;
+import com.hazelcast.jet.JetInstance;
+import com.hazelcast.jet.pipeline.Pipeline;
+import com.hazelcast.jet.pipeline.Sinks;
+import com.hazelcast.jet.pipeline.Sources;
+
+public class WordCounter {
+
+    private static final String LIST_NAME = "textList";
+
+    private static final String MAP_NAME = "countMap";
+
+    private Pipeline createPipeLine() {
+        Pipeline p = Pipeline.create();
+        p.drawFrom(Sources.<String> list(LIST_NAME))
+            .flatMap(word -> traverseArray(word.toLowerCase()
+                .split("\\W+")))
+            .filter(word -> !word.isEmpty())
+            .groupingKey(wholeItem())
+            .aggregate(counting())
+            .drainTo(Sinks.map(MAP_NAME));
+        return p;
+    }
+
+    public Long countWord(List<String> sentences, String word) {
+        long count = 0;
+        JetInstance jet = Jet.newJetInstance();
+        try {
+            List<String> textList = jet.getList(LIST_NAME);
+            textList.addAll(sentences);
+            Pipeline p = createPipeLine();
+            jet.newJob(p)
+                .join();
+            Map<String, Long> counts = jet.getMap(MAP_NAME);
+            count = counts.get(word);
+        } finally {
+            Jet.shutdownAll();
+        }
+        return count;
+    }
+
+}

hazelcast/src/main/resources/hazelcast.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.7.xsd"
+           xmlns="http://www.hazelcast.com/schema/config"
+           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+    <network>
+        <port auto-increment="true" port-count="20">5701</port>
+        <join>
+            <multicast enabled="false">
+	        </multicast>
+	      	<tcp-ip enabled="true">
+	        	<member>machine1</member>
+		        <member>localhost</member>
+	      	</tcp-ip>
+        </join>
+    </network>
+</hazelcast>

hazelcast/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <logger name="org.springframework" level="WARN" />
+    <logger name="org.springframework.transaction" level="WARN" />
+
+    <!-- in order to debug some marshalling issues, this needs to be TRACE -->
+    <logger name="org.springframework.web.servlet.mvc" level="WARN" />
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

hazelcast/src/test/java/com/baeldung/hazelcast/jet/WordCounterUnitTest.java

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+package com.baeldung.hazelcast.jet;
+
+import static org.junit.Assert.assertTrue;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Test;
+
+public class WordCounterUnitTest {
+
+    @Test
+    public void whenGivenSentencesAndWord_ThenReturnCountOfWord() {
+        List<String> sentences = new ArrayList<>();
+        sentences.add("The first second was alright, but the second second was tough.");
+        WordCounter wordCounter = new WordCounter();
+        long countSecond = wordCounter.countWord(sentences, "second");
+        assertTrue(countSecond == 3);
+    }
+
+}