BE-Challenge-Microservices

This repository demonstrates the transition of a monolithic application into a microservices architecture using Spring Boot, Spring Kafka, Spring Gateway, and Quartz Scheduler. This architecture enhances scalability, modularity, and inter-service communication, ensuring better system performance and reliability.

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📌 Challenge Chapter 7: Microservices Architecture & API Gateway

In this chapter, the application was divided into three microservices:

1. Order Service - Handles order-related operations such as order creation, retrieval, and management.
2. Product Service - Manages product-related functionalities, including product listing, inventory updates, and pricing.
3. User Service - Responsible for user authentication, registration, and profile management.

🔹 Key Implementations

• Microservices Separation: The system is now independently scalable and resilient to failures.
• Spring Gateway Integration:
  • Acts as the single entry point for all microservices.
  • Routes requests to respective services.
  • Provides load balancing and security features (such as authentication & rate limiting).
• Swagger Documentation Update:
  • The API documentation was modified to support microservices, enabling developers to test and explore endpoints seamlessly.

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📌 Challenge Chapter 8: Implementing Kafka and Quartz Scheduler

To enhance real-time communication and scheduling, Spring Kafka and Quartz Scheduler were integrated into the microservices architecture.

🔹 Key Implementations

1️⃣ Kafka for Event-Driven Communication

Kafka was introduced for asynchronous messaging between microservices, improving scalability and decoupling. The following Kafka-based features were implemented:

• Producer & Consumer Setup: Services now publish and consume events efficiently.
• Subscription Handling: Users can subscribe to notifications for product promotions.
• Promo Notification Mechanism: A Kafka topic was created to broadcast promotional notifications to subscribed users.

2️⃣ Quartz for Task Scheduling

Quartz Scheduler was integrated for handling automated scheduled tasks, such as:

• Periodic Promo Notifications: Automatically triggers scheduled messages to notify users about discounts or promotions.
• Order Processing Jobs: Allows background tasks, such as order status updates.

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⚙ Technology Stack

• Spring Boot - Framework for developing microservices.
• Spring Cloud Gateway - API Gateway for routing, load balancing, and security.
• Spring Kafka - Messaging system for inter-service communication.
• Quartz Scheduler - Job scheduling for automated tasks.
• Postman - API documentation and testing tool.