Class Cache

website/app/lib/cache.ts:7–60

}

class Cache {
  private static instance: Cache;
  private cache = new Map<string, CacheItem<unknown>>();

  private constructor() {}

  static getInstance(): Cache {
    if (!Cache.instance) {
      Cache.instance = new Cache();
    }
    return Cache.instance;
  }

  set<T>(key: string, data: T, ttl: number = 5 * 60 * 1000): void {
    this.cache.set(key, {
      data,
      timestamp: Date.now(),
      ttl
    });
  }

  get<T>(key: string): T | null {
    const item = this.cache.get(key);
    if (!item) {
      return null;
    }

    const now = Date.now();
    if (now - item.timestamp > item.ttl) {
      this.cache.delete(key);
      return null;
    }

    return item.data as T;
  }

  delete(key: string): void {
    this.cache.delete(key);
  }

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

  // 清理过期的缓存项
  cleanup(): void {
    const now = Date.now();
    Array.from(this.cache.entries()).forEach(([key, item]) => {
      if (now - item.timestamp > item.ttl) {
        this.cache.delete(key);
      }
    });
  }
}

export const cache = Cache.getInstance();