/**
 * @nahisaho/yata-scale - L2 Cache (Warm)
 *
 * Compressed in-memory cache for warm data
 */
import type { CacheStats, Entity, Relationship } from '../types.js';
/**
 * L2 Cache - Warm tier with compression
 */
export declare class L2Cache {
    private readonly entities;
    private readonly relationships;
    private readonly maxSize;
    private currentSize;
    private hits;
    private misses;
    private evictions;
    constructor(maxSizeBytes?: number);
    /**
     * Get entity from cache
     */
    getEntity(id: string): Entity | undefined;
    /**
     * Set entity in cache
     */
    setEntity(entity: Entity): void;
    /**
     * Delete entity from cache
     */
    deleteEntity(id: string): boolean;
    /**
     * Get relationship from cache
     */
    getRelationship(id: string): Relationship | undefined;
    /**
     * Set relationship in cache
     */
    setRelationship(relationship: Relationship): void;
    /**
     * Delete relationship from cache
     */
    deleteRelationship(id: string): boolean;
    /**
     * Compress data (simple JSON + text encoding)
     * In production, would use zstd, lz4, or similar
     */
    private compress;
    /**
     * Decompress data
     */
    private decompress;
    /**
     * Evict least recently used entry
     */
    private evictOne;
    /**
     * Promote entity to L1 (returns it for L1 to cache)
     */
    promoteEntity(id: string): Entity | undefined;
    /**
     * Demote entity from L1 (accepts and caches it)
     */
    demoteEntity(entity: Entity): void;
    /**
     * Clear all caches
     */
    clear(): void;
    /**
     * Get compression ratio
     */
    getCompressionRatio(): number;
    /**
     * Get cache statistics
     */
    getStats(): CacheStats;
    /**
     * Get entity count
     */
    get entityCount(): number;
    /**
     * Get relationship count
     */
    get relationshipCount(): number;
    /**
     * Get total entry count
     */
    get size(): number;
    /**
     * Get current size in bytes
     */
    get sizeBytes(): number;
}
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