package com.abg.uniapi.entity;
import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.GenerationType;
import jakarta.persistence.Id;
@Entity
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String name;
private double price;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
package com.abg.uniapi.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import com.abg.uniapi.entity.Product;
public interface ProductRepository extends JpaRepository<Product, Long> {
}
package com.abg.uniapi.service;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.abg.uniapi.entity.Product;
import com.abg.uniapi.repository.ProductRepository;
@Service
public class ProductService {
@Autowired
private ProductRepository productRepository;
public List<Product> getAllProducts(){
return productRepository.findAll();
}
public Product getProductById(Long id) {
return productRepository.findById(id).orElse(null);
}
public Product saveProudct(Product product) {
return productRepository.save(product);
}
public void deleteProduct(Long id) {
productRepository.deleteById(id);
}
}
package com.abg.uniapi.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.abg.uniapi.entity.Product;
import com.abg.uniapi.kafka.KafkaProducerService;
import com.abg.uniapi.service.ProductService;
@RestController
@RequestMapping("/api/product")
public class ProductController {
@Autowired
ProductService productService;
@Autowired
private KafkaProducerService kafkaProducerService;
@GetMapping
public List<Product> getAllProduct(){
return productService.getAllProducts();
}
@GetMapping("/{id}")
public Product getProductById(@PathVariable Long id) {
return productService.getProductById(id);
}
@PostMapping
public Product createProduct(@RequestBody Product product) {
Product saveProduct = productService.saveProudct(product);
kafkaProducerService.sendMessage("Created Product with name: "+saveProduct.getName()+", price: "+saveProduct.getPrice());
return saveProduct;
}
@PutMapping("/{id}")
public Product updateProduct(@PathVariable Long id, @RequestBody Product product) {
Product existingProduct = productService.getProductById(id);
if(existingProduct !=null) {
product.setId(id);
return productService.saveProudct(product);
}
return null;
}
@DeleteMapping("/{id}")
public void deleteProduct(@PathVariable Long id) {
productService.deleteProduct(id);
}
}
package com.abg.uniapi.kafka;
import org.springframework.kafka.annotation.KafkaListener;
import org.springframework.stereotype.Service;
@Service
public class KafkaConsumerListener {
@KafkaListener(topics = "products", groupId = "group_id")
public void consume(String message) {
System.out.println("Consumed message: " + message);
}
}
package com.abg.uniapi.kafka;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.stereotype.Service;
@Service
public class KafkaProducerService {
private static final String TOPIC = "products";
@Autowired
private KafkaTemplate<String, Object> kafkaTemplate;
public void sendMessage(String message) {
kafkaTemplate.send(TOPIC, message);
}
}
Application.properties
spring.application.name=uniapi
# MySQL Database Configuration
spring.datasource.url=jdbc:mysql://localhost:3306/uniapi
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# Hibernate specific properties
spring.jpa.database-platform=org.hibernate.dialect.MySQLDialect
spring.jpa.hibernate.ddl-auto=update
# Kafka Configuration
spring.kafka.bootstrap-servers=localhost:9092
spring.kafka.consumer.group-id=group_id
spring.kafka.consumer.auto-offset-reset=earliest
server.port=8084
pom.xml
<?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>3.3.2-SNAPSHOT</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.abg</groupId>
<artifactId>uniapi</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>uniapi</name>
<description>Role Management project for Spring Boot</description>
<url/>
<licenses>
<license/>
</licenses>
<developers>
<developer/>
</developers>
<scm>
<connection/>
<developerConnection/>
<tag/>
<url/>
</scm>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-streams</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.kafka</groupId>
<artifactId>spring-kafka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.session</groupId>
<artifactId>spring-session-core</artifactId>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</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>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<releases>
<enabled>false</enabled>
</releases>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<releases>
<enabled>false</enabled>
</releases>
</pluginRepository>
</pluginRepositories>
</project>
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