foyer-rs/foyer

Health v2 · maintenance only

Adoption not part of the score

1797 stars · 95 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Foyer is a Rust library providing a hybrid cache that seamlessly combines in-memory and disk caching with pluggable eviction algorithms. It offers a thread-safe, zero-copy in-memory abstraction and one-line integration with observability systems like Prometheus and OpenTelemetry.

Use cases

• add a hybrid in-memory and disk cache to a Rust application
• cache hot data in memory and spill to disk in Rust
• replace CacheLib-style hybrid caching in a Rust project
• plug in custom eviction algorithms for a cache
• monitor cache hit rates with Prometheus metrics
• speed up a database or storage engine with a caching layer

When to choose

• you need both memory and disk tiers in one cache API
• you want pluggable, replaceable caching algorithms
• you need high-concurrency, thread-safe caching in Rust
• you want built-in observability integrations

When to avoid

• you only need a simple in-memory cache with no disk tier
• you are not working in Rust
• you need a distributed, networked cache rather than an embedded library

Facets

library · maturity active

caching monitoring databases performance developer-tools rust windows hybrid-cache disk-cache in-memory-cache thread-safe zero-copy prometheus observability linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="foyer-rs/foyer")