A collection of notes and sample implementations for common low-level design patterns in Java.
A clean, asynchronous logger implementation demonstrating:
- Asynchronous Processing: Non-blocking logging with producer-consumer pattern
- Multiple Destinations: Console, file, remote logging support
- Custom Formatters: Pluggable message formatting strategies
- Thread Safety: Concurrent logging from multiple threads
- Proper Package Organization: Clean separation of concerns
- Design Patterns: Strategy, Dependency Inversion, Open/Closed principles
Key Features:
- BlockingQueue-based async processing
- Configurable log levels (DEBUG, INFO, WARNING, ERROR)
- Graceful shutdown handling
- Extensible architecture for new destinations/formatters
Classic Producer-Consumer pattern implementation showcasing:
- Thread Synchronization: Safe multi-threaded data sharing
- Bounded Buffer: Capacity-limited queue management
- Three Complete Implementations: BlockingQueue, wait/notify, and Semaphore approaches
- Generic Design: Type-safe buffer implementation
- Concurrency Best Practices: Modern Java threading utilities
- Synchronization Comparison: Different approaches to thread coordination
Key Features:
- BlockingQueue Implementation: Production-ready, high-level approach
- wait/notify Implementation: Classic low-level synchronization
- Semaphore Implementation: Counting semaphore-based resource management
- Multiple producer/consumer thread support
- Clean abstraction with Buffer interface
- Interview-ready implementations with comprehensive discussion points
- Demonstrates spectrum from high-level to low-level synchronization
- Single Responsibility Principle: Each class has one clear purpose
- Open/Closed Principle: Extensible without modification
- Dependency Inversion: Depend on abstractions, not concretions
- Strategy Pattern: Pluggable algorithms (formatters, destinations)
- Producer-Consumer Pattern: Decoupled thread communication
- Thread Safety: Proper synchronization mechanisms