Adding kafka communication using spring kafka

spring-kafka-communication-service/pom.xml

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+<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.6.1</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.amrut.prabhu</groupId>
+	<artifactId>spring-kafka-communication-service</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>Spring kafka Communication Service</name>
+	<properties>
+		<java.version>17</java.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.projectlombok</groupId>
+			<artifactId>lombok</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

spring-kafka-communication-service/src/main/java/com/amrut/prabhu/kafkacommunicationservice/KafkaCommunicationServiceApplication.java

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+package com.amrut.prabhu.kafkacommunicationservice;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.scheduling.annotation.EnableScheduling;
+
+@SpringBootApplication
+@EnableScheduling
+public class KafkaCommunicationServiceApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(KafkaCommunicationServiceApplication.class, args);
+    }
+
+}

spring-kafka-communication-service/src/main/java/com/amrut/prabhu/kafkacommunicationservice/KafkaConsumer.java

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+package com.amrut.prabhu.kafkacommunicationservice;
+
+import com.amrut.prabhu.kafkacommunicationservice.dto.Message;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+import org.springframework.kafka.annotation.KafkaListener;
+import org.springframework.stereotype.Service;
+
+@Service
+public class KafkaConsumer {
+
+    @KafkaListener(id = "my-client-application", topics = "${topic.name}")
+    public void consumer(ConsumerRecord<String, Message> consumerRecord) {
+        System.out.println("Consumed Record Details: " + consumerRecord);
+        Message message = consumerRecord.value();
+        System.out.println("Consumed Message" + message);
+    }
+}

spring-kafka-communication-service/src/main/java/com/amrut/prabhu/kafkacommunicationservice/KafkaProducer.java

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+package com.amrut.prabhu.kafkacommunicationservice;
+
+import com.amrut.prabhu.kafkacommunicationservice.dto.Message;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.scheduling.annotation.Scheduled;
+import org.springframework.stereotype.Component;
+
+import java.util.UUID;
+
+@Component
+public class KafkaProducer {
+
+    @Value("${topic.name}")
+    private String topicName;
+
+    private KafkaTemplate kafkaTemplate;
+
+    public KafkaProducer(KafkaTemplate kafkaTemplate) {
+        this.kafkaTemplate = kafkaTemplate;
+    }
+
+    @Scheduled(cron = "*/2 * * * * *")
+    public void sendMessage() {
+        UUID key = UUID.randomUUID();
+        Message payload = new Message("jack");
+        System.out.println("Sending Data " + payload);
+
+        ProducerRecord<String, Message> record = new ProducerRecord<String, Message>(topicName,
+                key.toString(),
+                payload);
+        record.headers()
+                .add("message-id", UUID.randomUUID()
+                        .toString()
+                        .getBytes());
+        kafkaTemplate.send(record);
+    }
+}

spring-kafka-communication-service/src/main/java/com/amrut/prabhu/kafkacommunicationservice/dto/Message.java

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+package com.amrut.prabhu.kafkacommunicationservice.dto;
+
+public record Message(String name) {
+}

spring-kafka-communication-service/src/main/java/com/amrut/prabhu/kafkacommunicationservice/dto/converters/MessageDeSerializer.java

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+package com.amrut.prabhu.kafkacommunicationservice.dto.converters;
+
+import com.amrut.prabhu.kafkacommunicationservice.dto.Message;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.kafka.common.errors.SerializationException;
+import org.apache.kafka.common.serialization.Deserializer;
+
+import java.io.IOException;
+
+public class MessageDeSerializer implements Deserializer<Message> {
+
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    @Override
+    public Message deserialize(String topic, byte[] data) {
+        try {
+            return objectMapper.readValue(data, Message.class);
+        } catch (IOException e) {
+            throw new SerializationException(e);
+        }
+    }
+}

spring-kafka-communication-service/src/main/java/com/amrut/prabhu/kafkacommunicationservice/dto/converters/MessageSerializer.java

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+package com.amrut.prabhu.kafkacommunicationservice.dto.converters;
+
+import com.amrut.prabhu.kafkacommunicationservice.dto.Message;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.kafka.common.errors.SerializationException;
+import org.apache.kafka.common.serialization.Serializer;
+
+public class MessageSerializer implements Serializer<Message> {
+
+    private final ObjectMapper objectMapper = new ObjectMapper();
+
+    @Override
+    public byte[] serialize(String topic, Message data) {
+        try {
+            return objectMapper.writeValueAsBytes(data);
+        } catch (JsonProcessingException e) {
+            throw new SerializationException(e);
+        }
+
+    }
+}

spring-kafka-communication-service/src/main/resources/application.yml

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+spring:
+  kafka:
+    bootstrap-servers:
+    - localhost:9092
+    consumer:
+      client-id: my-client-consumer
+      group-id: spring-application-group
+      key-deserializer: org.apache.kafka.common.serialization.StringDeserializer
+      value-deserializer: com.amrut.prabhu.kafkacommunicationservice.dto.converters.MessageDeSerializer
+    producer:
+      client-id: my-client-application
+      key-serializer: org.apache.kafka.common.serialization.StringSerializer
+      value-serializer: com.amrut.prabhu.kafkacommunicationservice.dto.converters.MessageSerializer
+        
+topic:
+  name: "first-topic"
+server:
+  port: 9191

spring-kafka-communication-service/src/test/java/com/amrut/prabhu/kafkacommunicationservice/KafkaCommunicationServiceApplicationTests.java

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+package com.amrut.prabhu.kafkacommunicationservice;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class KafkaCommunicationServiceApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}