import { OnApplicationShutdown } from '@nestjs/common';
import { EventEmitter2 } from '@nestjs/event-emitter';
import { ApiPromise } from '@polkadot/api';
import { NodeConfig } from '../configure/NodeConfig';
import { SubqueryProject } from '../configure/project.model';
import { ApiService } from './api.service';
import { DictionaryQueryEntry, DictionaryService } from './dictionary.service';
import { DsProcessorService } from './ds-processor.service';
import { BlockContent } from './types';
export declare class FetchService implements OnApplicationShutdown {
    private apiService;
    private nodeConfig;
    private project;
    private dictionaryService;
    private dsProcessorService;
    private eventEmitter;
    private latestBestHeight;
    private latestFinalizedHeight;
    private latestProcessedHeight;
    private latestBufferedHeight;
    private blockBuffer;
    private blockNumberBuffer;
    private isShutdown;
    private parentSpecVersion;
    private useDictionary;
    private dictionaryQueryEntries?;
    constructor(apiService: ApiService, nodeConfig: NodeConfig, project: SubqueryProject, dictionaryService: DictionaryService, dsProcessorService: DsProcessorService, eventEmitter: EventEmitter2);
    onApplicationShutdown(): void;
    get api(): ApiPromise;
    getDictionaryQueryEntries(): DictionaryQueryEntry[];
    register(next: (value: BlockContent) => Promise<void>): () => void;
    init(): Promise<void>;
    getFinalizedBlockHead(): Promise<void>;
    getBestBlockHead(): Promise<void>;
    latestProcessed(height: number): void;
    startLoop(initBlockHeight: number): Promise<void>;
    fillNextBlockBuffer(initBlockHeight: number): Promise<void>;
    fillBlockBuffer(): Promise<void>;
    fetchMeta(height: number): Promise<boolean>;
    private nextEndBlockHeight;
    private dictionaryValidation;
    private setLatestBufferedHeight;
    private getBaseHandlerKind;
    private getBaseHandlerFilters;
}