FusionCache is a .NET caching framework that manages local and distributed data storage. It functions as a hybrid cache implementation, combining fast in-memory storage with a distributed second-level cache to reduce latency and remote data fetches.
The framework includes a cache stampede protector that ensures only one request fetches missing data while concurrent calls wait. It synchronizes data across multiple application nodes using a backplane and provides an observability-driven approach with built-in metrics, structured logging, and telemetry.
The system covers a broad range of caching strategies, including adaptive expiration, tag-based group invalidation, and eager background refreshing. It provides high availability features such as circuit breakers for distributed resource protection, fail-safe fallbacks for unavailable data sources, and object cloning to prevent internal store mutation.
Performance and system health are monitored via OpenTelemetry integration.
