/// <reference types="node" />
import EventEmitter from 'events';
import { ExtractHandlerRequest, ExtractResponse } from './extract';
import { TerminateExractorHandlerRequest, TerminateExractorHandlerResponse } from './terminate-extractor';
/**
 * A class to handle extractors creation and deletion requests on the EPS API layer.
 * It dedups the extractor creation and deletion requests for the same connection-id.
 *
 * It is based on the fact that extactor creation and deletion are always paired in a
 * extractor lifecycle. On the monolith side, a protocol sends a creation request
 * during the init, while it sends a delete request when the protocol is destroyed.
 *
 * Currently, 1 connection-id can have only 1 paired extractor, so when a connection-id
 * is trying to send extractor creation request multi times (triggered by multiple protocol),
 * we want them to share the single extractor instance.
 */
export declare class ExtractHandler {
    private connectionStates;
    private requestCounts;
    handleExtractRequest(extractorLaunchedEvent: EventEmitter, extractHandlerRequest: ExtractHandlerRequest): Promise<ExtractResponse>;
    handleTerminationRequest(terminationRequest: TerminateExractorHandlerRequest): TerminateExractorHandlerResponse;
    getConnectionCount(): number;
    private removeConnection;
    private addRequestCount;
    private reduceRequestCount;
    private isDeletableConnection;
}