import { OnModuleInit, OnModuleDestroy } from '@nestjs/common';
import { Observable } from 'rxjs';
export interface MemoryRetentionPolicy {
    maxSize: number;
    maxAge: number;
    compressionThreshold: number;
    evictionStrategy: 'fifo' | 'lifo' | 'lru' | 'lfu' | 'ttl';
    checkInterval: number;
    enabled: boolean;
}
export interface MemoryCollectionConfig {
    id: string;
    policy: MemoryRetentionPolicy;
    itemSizeEstimator?: (item: any) => number;
    itemAgeExtractor?: (item: any) => Date;
    onEviction?: (items: any[]) => void;
    onCompression?: (items: any[]) => any[];
}
export interface MemoryUsageStats {
    totalCollections: number;
    totalItems: number;
    estimatedSize: number;
    collectionsOverThreshold: number;
    lastCleanup: Date | null;
    cleanupCount: number;
    evictedItems: number;
    compressedItems: number;
}
export interface CollectionStats {
    id: string;
    itemCount: number;
    estimatedSize: number;
    oldestItem: Date | null;
    newestItem: Date | null;
    lastEviction: Date | null;
    evictedCount: number;
    compressionRatio: number;
    policy: MemoryRetentionPolicy;
}
export declare class MemoryManagerService implements OnModuleInit, OnModuleDestroy {
    private readonly logger;
    private readonly collections;
    private readonly destroy$;
    private readonly statsSubject;
    private cleanupCount;
    private lastCleanup;
    constructor();
    onModuleInit(): Promise<void>;
    onModuleDestroy(): void;
    createCollection<T>(config: MemoryCollectionConfig): string;
    addToCollection<T>(collectionId: string, item: T): void;
    addBatchToCollection<T>(collectionId: string, items: T[]): void;
    getFromCollection<T>(collectionId: string): T[];
    getRecentFromCollection<T>(collectionId: string, count: number): T[];
    filterCollection<T>(collectionId: string, predicate: (item: T) => boolean): T[];
    clearCollection(collectionId: string): void;
    removeCollection(collectionId: string): boolean;
    getCollectionStats(collectionId: string): CollectionStats | null;
    getAllCollectionStats(): CollectionStats[];
    getMemoryUsage(): MemoryUsageStats;
    getMemoryUsageStream(): Observable<MemoryUsageStats>;
    forceCleanup(): void;
    static createTimelinePolicy(maxItems?: number, maxHours?: number): MemoryRetentionPolicy;
    static createMetricsPolicy(maxItems?: number, maxDays?: number): MemoryRetentionPolicy;
    static createAlertPolicy(maxItems?: number, maxDays?: number): MemoryRetentionPolicy;
    private startMemoryMonitoring;
    private updateStats;
    private checkMemoryPressure;
    private performPeriodicCleanup;
    private getInitialStats;
}