Notification-System-LLD

# Notification System - Low Level Design A **comprehensive C++ notification system** that demonstrates advanced design patterns and architectural principles for building scalable, extensible notification infrastructure. ## Design Pattern Architecture - **Observer Pattern**: Real-time notification distribution to multiple subscribers with automatic updates - **Decorator Pattern**: Dynamic feature enhancement with timestamps, signatures, and formatting options - **Strategy Pattern**: Multiple delivery methods (Email, SMS, Push notifications, Popup alerts) - **Singleton Pattern**: Centralized notification service management with global access ## Notification Features - **Multi-channel Delivery**: Support for email, SMS, push notifications, and in-app alerts - **Real-time Processing**: Instant notification delivery with asynchronous processing - **Template System**: Customizable notification templates with dynamic content injection - **Priority Management**: Notification prioritization with urgent, normal, and low priority levels - **Delivery Confirmation**: Confirmation tracking and delivery status reporting ## Advanced Capabilities - **Subscription Management**: User preference management for notification types and frequencies - **Batch Processing**: Efficient bulk notification sending with queue management - **Rate Limiting**: Intelligent rate limiting to prevent notification spam - **Retry Mechanism**: Automatic retry logic for failed notification deliveries - **Analytics Integration**: Notification performance metrics and delivery analytics ## Technical Excellence - **SOLID Principles**: Clean architecture with single responsibility and dependency inversion - **Memory Management**: Efficient resource allocation with proper cleanup mechanisms - **Thread Safety**: Concurrent notification processing with thread-safe operations - **Error Handling**: Comprehensive error handling with graceful degradation - **Performance Optimization**: Optimized algorithms for high-throughput notification processing ## Extensibility Features - **Plugin Architecture**: Easy integration of new notification channels and providers - **Configuration Management**: Flexible configuration system for different deployment environments - **Monitoring Integration**: Built-in monitoring and alerting for system health - **API Integration**: RESTful API endpoints for external system integration The system showcases enterprise-level notification architecture with emphasis on scalability, reliability, and maintainability, suitable for production environments.

A C++ notification system demonstrating Observer and Decorator patterns