Hackforge Academy

Explanation

Microservices architecture divides a large application into small, independent services. Each service is responsible for a single business capability and can be developed, deployed, and scaled independently.

Code:

Student Service
Course Service
Payment Service
Notification Service

Explanation

Each microservice is a separate Spring Boot application with its own controller, service, repository, and database.

Code:

@SpringBootApplication
public class StudentServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(StudentServiceApplication.class, args);
    }
}

Explanation

Each microservice exposes REST endpoints that can be consumed by other services or client applications.

Code:

@RestController
@RequestMapping("/students")
public class StudentController {

    @GetMapping
    public String getStudents() {
        return "Student Service";
    }
}

Explanation

Microservices communicate with one another using REST APIs. Spring Boot provides RestTemplate and WebClient for inter-service communication.

Code:

@Autowired
private WebClient webClient;

webClient.get()
    .uri("http://course-service/courses")
    .retrieve()
    .bodyToMono(String.class);

Explanation

Each microservice owns its own database. This ensures loose coupling and allows services to evolve independently without affecting other services.

Code:

Student Service  --> StudentDB
Course Service   --> CourseDB
Payment Service  --> PaymentDB