/// <reference types="node" />
import { Request, RequestContext } from "../../api/request";
type StatsMaps = {
    completedRequests: Map<string, number>;
    connections: Map<string, number>;
    failedRequests: Map<string, number>;
    ongoingRequests: Map<string, number>;
};
type SerializableStats = {
    completedRequests: Record<string, number>;
    connections: Record<string, number>;
    failedRequests: Record<string, number>;
    ongoingRequests: Record<string, number>;
};
type StatsFrame = SerializableStats & {
    timestamp: number;
};
type StatsResponse = {
    hits: StatsFrame[];
    total: number;
};
type LastStatsResponse = StatsFrame | (StatsMaps & {
    timestamp: number;
});
/**
 * @class Statistics
 * @param {Kuzzle} kuzzle
 */
export default class Statistics {
    private cacheKeyPrefix;
    enabled: boolean;
    ttl: number;
    interval: number;
    lastFrame: number | null;
    timer: NodeJS.Timeout | null;
    currentStats: StatsMaps;
    private readonly logger;
    constructor();
    /**
     * Start recording a new request
     *
     * @param {Request} request
     */
    startRequest(request?: Request): void;
    /**
     * Mark an ongoing request as 'completed'
     *
     * @param {Request} request
     */
    completedRequest(request?: Request): void;
    /**
     * Mark an ongoing request as 'completed'
     *
     * @param {Request} request
     */
    failedRequest(request?: Request): void;
    /**
     * Register a newly created connection
     *
     * @param {RequestContext} requestContext
     */
    newConnection(requestContext: RequestContext): void;
    /**
     * Removes a connection from the statistics
     *
     * @param {RequestContext} requestContext
     */
    dropConnection(requestContext: RequestContext): void;
    /**
     * Gets stored statistics frames from a date
     *
     * @returns {Promise}
     */
    getLastStats(): Promise<LastStatsResponse>;
    /**
     * Gets the last saved statistics frame from a date
     *
     * @param {Request} request
     * @returns {Promise<Object>}
     */
    getStats(request?: Request): Promise<StatsResponse>;
    /**
     * Gets all the saved statistics
     *
     * @returns {Promise<Object>}
     */
    getAllStats(): Promise<StatsResponse>;
    /**
     * Init statistics component
     */
    init(): void;
    writeStats(): Promise<void>;
}
export {};