Rate-Limiter (Singleton / Factory / Strategy Example)

This sample Java project demonstrates how to implement API Rate Limiting in a framework-agnostic way using classic design patterns:

1. Singleton (for centralized configuration)
2. Strategy (to allow different rate-limiting algorithms)
3. Factory (to decide which strategy to use at runtime)

It includes:

• Fixed Window rate-limiter (FixedWindowRL)
• Sliding Window rate-limiter (SlidingWindowRL)
• A Servlet Filter example (RateLimitingFilter) to show how to integrate into a typical web environment
• A standalone demo class (MainDemo) for quick testing

How to run project

Run the code from com.example.ratelimit.demo.MainDemo

what design patterns are used

• Factory
• Strategy
• Singleton

what principles are followed

• SOILD