caching-strategylisted

# Caching Strategy Pattern ## Purpose Define explicit caching strategies for different data access patterns and consistency requirements. ## Scope Applies to: - Application Layer - Infrastructure Layer ## Rules - Cache is never source of truth - Explicit cache invalidation strategies - Appropriate TTL per data type - Handle cache misses gracefully - Support cache warming when needed - Caching strategy interfaces defined in Application layer - Strategy implementations in Infrastructure layer (Redis, in-memory, etc.) ## Anti-Patterns - Treating cache as source of truth - No cache invalidation strategy - Too long or too short TTL - Caching everything without strategy - Ignoring cache consistency requirements - Cache keys without namespace/prefix ## Minimal Example ```csharp // Application Layer public interface ICachingStrategy { Task<T?> GetAsync<T>(string key); Task SetAsync<T>(string key, T value, TimeSpan? ttl = null); Task InvalidateAsync(string key); } // Infrastructure Layer public class RedisCachingStrategy : ICachingStrategy { // Implementation... } ```