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[Repo Assist] perf: upgrade analysis cache from FIFO to LRU eviction #246

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[Repo Assist] perf: upgrade analysis cache from FIFO to LRU eviction #246

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5 changes: 4 additions & 1 deletion src/metricsAnalyzer/metricsAnalyzerFactory.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,9 @@ export class MetricsAnalyzerFactory {
const cacheKey = `${languageId}:${sourceText.length}:${hashString(sourceText)}`;
const cached = analysisCache.get(cacheKey);
if (cached) {
// Move to end to maintain LRU order (most recently used stays at back)
analysisCache.delete(cacheKey);
analysisCache.set(cacheKey, cached);
return cached;
}
const results = analyzer(sourceText);
Expand All @@ -133,7 +136,7 @@ export class MetricsAnalyzerFactory {
/** Maximum number of analysis results to keep in cache (one entry per unique file content). */
const CACHE_MAX_SIZE = 20;

/** Cache of analysis results keyed by language + content hash. Evicts oldest entry when full. */
/** Cache of analysis results keyed by language + content hash. Evicts least-recently-used entry when full. */
const analysisCache = new Map<string, UnifiedFunctionMetrics[]>();

/** Fast non-cryptographic hash for cache key generation (djb2 variant). */
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