/**
 * 本地内存缓存服务
 * 提供分布式缓存支持，提升 API 响应速度
 * 生产环境建议通过 UnifiedCacheAdapter 接入 Redis
 */
/** 本地缓存实现（无 Redis 依赖） */
export declare class CacheService {
    cache: Map<string, {
        value: unknown;
        expiresAt: number;
    }>;
    cleanupInterval: ReturnType<typeof setInterval> | null;
    constructor();
    /** 获取缓存 */
    get(key: string): unknown;
    /**
     * 设置缓存
     * @param ttlSeconds 默认 300 秒
     */
    set(key: string, value: unknown, ttlSeconds?: number): void;
    /** 删除缓存 */
    delete(key: string): boolean;
    /** 清空所有缓存 */
    clear(): void;
    /** 清理过期缓存 */
    cleanupExpired(): void;
    /** 获取缓存统计信息 */
    getStats(): {
        size: number;
        entries: string[];
    };
    /** 关闭缓存服务 */
    shutdown(): void;
}
/** 缓存键生成器 */
export declare class CacheKeyBuilder {
    static candidate(id: string): string;
    static candidatesList(page: number, limit: number, status?: string): string;
    static recipe(id: string): string;
    static recipesList(page: number, limit: number, category?: string): string;
    static rule(id: string): string;
    static rulesList(page: number, limit: number, status?: string): string;
    static health(): string;
    static stats(): string;
}
export declare const cacheService: CacheService;