/**
 * @nahisaho/yata-scale - L3 Cache (Cold)
 *
 * Disk-based cache for cold data using LMDB
 */
import type { CacheStats, Entity, Relationship } from '../types.js';
/**
 * L3 Cache - Cold tier, disk-based
 * Note: This is a simplified in-memory simulation.
 * In production, would use LMDB or similar.
 */
export declare class L3Cache {
    private readonly entities;
    private readonly relationships;
    private readonly maxEntries;
    private hits;
    private misses;
    private evictions;
    constructor(maxEntries?: number);
    /**
     * Get entity from cache
     */
    getEntity(id: string): Promise<Entity | undefined>;
    /**
     * Set entity in cache
     */
    setEntity(entity: Entity): Promise<void>;
    /**
     * Delete entity from cache
     */
    deleteEntity(id: string): Promise<boolean>;
    /**
     * Get relationship from cache
     */
    getRelationship(id: string): Promise<Relationship | undefined>;
    /**
     * Set relationship in cache
     */
    setRelationship(relationship: Relationship): Promise<void>;
    /**
     * Delete relationship from cache
     */
    deleteRelationship(id: string): Promise<boolean>;
    /**
     * Batch get entities
     */
    getEntities(ids: string[]): Promise<Map<string, Entity>>;
    /**
     * Batch set entities
     */
    setEntities(entities: Entity[]): Promise<void>;
    /**
     * Evict oldest entity
     */
    private evictOldestEntity;
    /**
     * Evict oldest relationship
     */
    private evictOldestRelationship;
    /**
     * Promote entity to L2 (returns it for L2 to cache)
     */
    promoteEntity(id: string): Promise<Entity | undefined>;
    /**
     * Demote entity from L2 (accepts and caches it)
     */
    demoteEntity(entity: Entity): Promise<void>;
    /**
     * Clear all caches
     */
    clear(): Promise<void>;
    /**
     * Sync to disk (no-op in this simulation)
     */
    sync(): Promise<void>;
    /**
     * Close the cache
     */
    close(): Promise<void>;
    /**
     * Get cache statistics
     */
    getStats(): CacheStats;
    /**
     * Estimate size in bytes
     */
    private estimateSize;
    /**
     * Get entity count
     */
    get entityCount(): number;
    /**
     * Get relationship count
     */
    get relationshipCount(): number;
    /**
     * Get total entry count
     */
    get size(): number;
}
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