Service Module

A standalone OSGi service (business logic) that can be consumed by other modules.

• Encapsulate reusable logic (e.g., “EmailNotificationService”).
• Follow SOLID principles (single responsibility).

Implementation

Create the Module

blade create -t service notification-service

Define the Service

notification-service/src/main/java/com/example/notification/NotificationService.java

@Component(service = NotificationService.class)
public class NotificationService {
    public void sendEmail(String to, String subject, String body) {
        // Logic to send emails
        System.out.println("Email sent to: " + to);
    }
}

Use the Service in Another Module

// In another module (e.g., a portlet)
@Reference
private NotificationService _notificationService;

public void notifyUser(User user) {
    _notificationService.sendEmail(
        user.getEmailAddress(),
        "Welcome!",
        "Thanks for signing up."
    );
}

Use Cases

• Reusable Utilities: Logging, notifications, validations.
• Modular Design: Decouple business logic from UI.