75dfcf2d50
- Added SearchTextCache for LRU caching of extracted search text with mtime invalidation. - Introduced SearchTextExtractor for lightweight extraction of searchable text from session messages. - Updated SessionSearcher to utilize the new extractor and cache for improved search performance. - Added tests for SearchTextCache and SearchTextExtractor to ensure functionality and correctness.
95 lines
2.4 KiB
TypeScript
95 lines
2.4 KiB
TypeScript
/**
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* SearchTextCache - LRU cache for extracted search text with mtime invalidation.
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*
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* Caches SearchTextResult per session file path. Entries are small (~1KB each,
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* just text + metadata), so 200 entries is a reasonable default.
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*
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* Invalidation: mtime comparison on get(). If the file's mtime has changed
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* since caching, the entry is considered stale and undefined is returned.
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* No TTL needed — mtime check is sufficient.
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*/
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import type { SearchableEntry } from './SearchTextExtractor';
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interface CacheEntry {
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entries: SearchableEntry[];
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sessionTitle: string | undefined;
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mtimeMs: number;
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}
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export class SearchTextCache {
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private readonly cache = new Map<string, CacheEntry>();
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private readonly maxSize: number;
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constructor(maxSize: number = 200) {
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this.maxSize = maxSize;
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}
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/**
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* Get cached entries for a file path if the mtime matches.
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* Returns undefined if not cached or stale.
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*/
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get(
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filePath: string,
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mtimeMs: number
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): { entries: SearchableEntry[]; sessionTitle: string | undefined } | undefined {
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const entry = this.cache.get(filePath);
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if (!entry) return undefined;
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// Stale — file was modified since we cached it
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if (entry.mtimeMs !== mtimeMs) {
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this.cache.delete(filePath);
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return undefined;
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}
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// LRU: delete and re-insert to move to end (most recent)
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this.cache.delete(filePath);
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this.cache.set(filePath, entry);
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return { entries: entry.entries, sessionTitle: entry.sessionTitle };
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}
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/**
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* Cache extracted entries for a file path.
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*/
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set(
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filePath: string,
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mtimeMs: number,
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entries: SearchableEntry[],
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sessionTitle: string | undefined
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): void {
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// If already exists, delete first to update position
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this.cache.delete(filePath);
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// Evict oldest if at capacity
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if (this.cache.size >= this.maxSize) {
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const oldest = this.cache.keys().next().value;
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if (oldest !== undefined) {
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this.cache.delete(oldest);
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}
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}
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this.cache.set(filePath, { entries, sessionTitle, mtimeMs });
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}
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/**
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* Remove a specific entry from the cache.
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*/
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invalidate(filePath: string): void {
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this.cache.delete(filePath);
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}
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/**
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* Clear all cached entries.
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*/
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clear(): void {
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this.cache.clear();
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}
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/**
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* Current number of cached entries.
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*/
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get size(): number {
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return this.cache.size;
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}
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}
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