multi-search

// Tiny in-process LRU + TTL cache. No deps, no disk. Resets when the
// LM Studio plugin worker (or the MCP server process) restarts.

interface Entry<V> {
  value: V;
  expiresAt: number;
}

export class TtlLruCache<V> {
  private map = new Map<string, Entry<V>>();
  constructor(private readonly maxEntries: number, private readonly ttlMs: number) {}

  get(key: string): V | undefined {
    const e = this.map.get(key);
    if (!e) return undefined;
    if (Date.now() > e.expiresAt) {
      this.map.delete(key);
      return undefined;
    }
    // Refresh LRU position.
    this.map.delete(key);
    this.map.set(key, e);
    return e.value;
  }

  set(key: string, value: V): void {
    if (this.ttlMs <= 0) return; // caching disabled
    if (this.map.has(key)) this.map.delete(key);
    this.map.set(key, { value, expiresAt: Date.now() + this.ttlMs });
    while (this.map.size > this.maxEntries) {
      const oldest = this.map.keys().next().value;
      if (oldest === undefined) break;
      this.map.delete(oldest);
    }
  }

  clear(): void {
    this.map.clear();
  }

  get size(): number {
    return this.map.size;
  }
}