import { Logger } from 'log4js';
import { ICache } from '../../dex-helper/icache';
export type PoolsWriterOptions<D> = {
    cache: ICache;
    key: string;
    logger: Logger;
    listPools?: () => Iterable<[string, D]>;
    flushIntervalMs?: number;
    pruneIntervalMs?: number;
    pruneAgeMs?: number;
    hscanCount?: number;
    now?: () => number;
};
export declare class PoolsWriter<D extends object> {
    private readonly cache;
    readonly key: string;
    private readonly logger;
    private readonly listPools?;
    private readonly flushIntervalMs;
    private readonly pruneIntervalMs;
    private readonly pruneAgeMs;
    private readonly hscanCount;
    private readonly now;
    private pending;
    private timer?;
    private lastPruneAt;
    private inFlight?;
    constructor(options: PoolsWriterOptions<D>);
    start(): void;
    touch(field: string, descriptor: D): void;
    get pendingCount(): number;
    flush(): Promise<void>;
    private doFlush;
    prune(): Promise<number>;
    release(): void;
}