"LayerCache stacks multiple cache layers (Memory → Redis → Disk) behind a single get() call. On a cache hit, it serves the fastest available layer, then automatically backfills the layers above it."
"On a cache miss, the fetcher function runs exactly once, no matter how many requests are waiting. All concurrent callers get the same promise, preventing multiple database hits."
LayerCache addresses common caching challenges in Node.js services by stacking multiple cache layers: Memory, Redis, and Disk. It serves the fastest available layer on a cache hit and backfills layers above it. On a cache miss, it ensures that the fetcher function runs only once, regardless of concurrent requests, preventing cache stampedes. This solution aims to streamline the caching process, reduce complexity, and improve reliability, ultimately saving engineering time and effort in managing cache systems.
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