import Catalog from './catalog';
import Result from './result';
/**
 * A Session is used to send queries and receive results from the remote MillenniumDB instance
 */
declare class Session {
    private _open;
    private readonly _connection;
    private readonly _chunkDecoder;
    private readonly _messageDecoder;
    private readonly _responseHandler;
    private readonly _results;
    /**
     * This constructor should never be called directly
     *
     * @param url the URL for the MillenniumDB server
     * @param options the options for the {@link Session}
     */
    constructor(url: URL);
    /**
     * Get the {@link Catalog} of the remote MillenniumDB instance
     *
     * @returns Promise that will be resolved with the {@link Catalog}
     */
    catalog(): Promise<Catalog>;
    /**
     * Sends a request for executing a query to the server
     *
     * @param query the query to execute
     * @returns a {@link Result} for the query
     */
    run(query: string): Result;
    close(): Promise<void>;
    /**
     * Try to cancel another query given a {@link Result}. This method should be called exclusively by driver
     *
     * @param result the {@link Result} to cancel
     * @returns a promise that resolves when the query is cancelled
     */
    _cancel(result: Result): Promise<void>;
    private _ensureOpen;
    /**
     * Send a request to the server and attach an observer for its response
     *
     * @param iobuffer the data to send
     * @param observer that will handle the received data
     */
    private _send;
    /**
     * Handler for incoming data from the server
     *
     * @param iobuffer the data received
     */
    private _onServerMessage;
    /**
     * Handler for chunks that were decoded
     *
     * @param iobuffer the data received
     */
    private _onChunksDecoded;
}
export default Session;