import { CacheConfig, CacheKey, CacheEntry, CacheStats } from '../types/cache';
export declare abstract class CacheBackend {
    abstract get(key: string): Promise<CacheEntry | null>;
    abstract set(key: string, value: CacheEntry, ttl: number): Promise<void>;
    abstract delete(key: string): Promise<void>;
    abstract clear(): Promise<void>;
    abstract getStats(): Promise<CacheStats>;
    abstract disconnect?(): Promise<void>;
}
export declare class MemoryCacheBackend extends CacheBackend {
    private cache;
    private stats;
    get(key: string): Promise<CacheEntry | null>;
    set(key: string, value: CacheEntry, ttl: number): Promise<void>;
    delete(key: string): Promise<void>;
    clear(): Promise<void>;
    getStats(): Promise<CacheStats>;
    disconnect(): Promise<void>;
}
export declare class FilesystemCacheBackend extends CacheBackend {
    private path;
    constructor(path: string);
    private getFilePath;
    get(key: string): Promise<CacheEntry | null>;
    set(key: string, value: CacheEntry, ttl: number): Promise<void>;
    delete(key: string): Promise<void>;
    clear(): Promise<void>;
    getStats(): Promise<CacheStats>;
    disconnect(): Promise<void>;
}
export declare class RedisCacheBackend extends CacheBackend {
    private redis;
    private connected;
    constructor(config: CacheConfig['redis']);
    get(key: string): Promise<CacheEntry | null>;
    set(key: string, value: CacheEntry, ttl: number): Promise<void>;
    delete(key: string): Promise<void>;
    clear(): Promise<void>;
    getStats(): Promise<CacheStats>;
    disconnect(): Promise<void>;
}
export declare class CacheService {
    private backend;
    private config;
    private static instance;
    constructor(config: CacheConfig);
    static getInstance(config?: CacheConfig): CacheService;
    private createBackend;
    private generateKey;
    get(cacheKey: CacheKey): Promise<CacheEntry | null>;
    set(cacheKey: CacheKey, value: CacheEntry['value']): Promise<void>;
    delete(cacheKey: CacheKey): Promise<void>;
    clear(): Promise<void>;
    getStats(): Promise<CacheStats>;
    disconnect(): Promise<void>;
    static cleanup(): Promise<void>;
}
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