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fix(adl): promote cached entries on hit so eviction is LRU not FIFO #151

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fix(adl): promote cached entries on hit so eviction is LRU not FIFO #151

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5 changes: 5 additions & 0 deletions src/routes/adl.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -165,6 +165,11 @@ export function adlRoutes(): Hono {
// Check cache to avoid redundant expensive RPC calls
const cached = adlCache.get(slab);
if (cached && Date.now() - cached.fetchedAt < ADL_CACHE_TTL_MS) {
// Promote to most-recently-used so the FIFO-by-insertion eviction
// at lines below behaves as LRU. Without this, hot keys inserted
// early get evicted while cold keys inserted later survive.
adlCache.delete(slab);
adlCache.set(slab, cached);
return c.json(cached.data, 200, { "X-Cache": "HIT" });
}

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