import { Session, SessionVariable } from './types';
import { RequestClient } from './request/RequestClient';
export declare class SessionManager {
    private serverUrl;
    private contextName;
    private requestClient;
    private loggedErrors;
    private sessionStateLinkError;
    constructor(serverUrl: string, contextName: string, requestClient: RequestClient);
    private sessions;
    private currentContext;
    private settingContext;
    private _debug;
    private printedSessionState;
    get debug(): boolean;
    set debug(value: boolean);
    /**
     * Checks if session is valid. Session is considered valid if time since it's creation is less than 'sessionInactiveTimeout' attribute.
     * @param session - session object.
     * @returns - boolean indicating if session is valid.
     */
    private isSessionValid;
    /**
     * Removes session from pool of hot sessions.
     * @param session - session object.
     * @returns - void.
     */
    private removeSessionFromPool;
    /**
     * Filters session pool to keep only valid sessions.
     * @param session - session object.
     * @returns - void.
     */
    private removeExpiredSessions;
    /**
     * Throws set of errors as a single error.
     * @param errors - array of errors or string.
     * @param prefix - an optional final error prefix.
     * @returns - never.
     */
    private throwErrors;
    /**
     * Returns session.
     * If there is a hot session available, it will be returned immediately and an asynchronous request to create new hot session will be submitted.
     * If there is no available session, 2 session creation requests will be submitted. The session is returned once it is created and ready.
     * @param accessToken - an optional access token.
     * @returns - a promise which resolves with a session.
     */
    getSession(accessToken?: string): Promise<Session>;
    /**
     * Returns error message based on the response from SAS API.
     * @param err - an optional access token.
     * @param accessToken - an optional access token.
     * @returns - an error message.
     */
    private getErrorMessage;
    /**
     * Deletes session.
     * @param id - a session id.
     * @param accessToken - an optional access token.
     * @returns - a promise which resolves when session is deleted.
     */
    clearSession(id: string, accessToken?: string): Promise<void>;
    /**
     * Creates sessions in amount equal to MAX_SESSION_COUNT.
     * @param accessToken - an optional access token.
     * @returns - a promise which resolves when required amount of sessions is created.
     */
    private createSessions;
    /**
     * Waits for the current context to be set.
     * @returns - a promise which resolves when current context is set.
     */
    private waitForCurrentContext;
    /**
     * Creates and waits for session to be ready.
     * @param accessToken - an optional access token.
     * @returns - a promise which resolves with a session.
     */
    private createAndWaitForSession;
    /**
     * Sets current context.
     * @param accessToken - an optional access token.
     * @returns - a promise which resolves when current context is set.
     */
    private setCurrentContext;
    /**
     * Waits for session to be ready.
     * @param session - a session object.
     * @param etag - an etag that can be a string or null.
     * @param accessToken - an optional access token.
     * @returns - a promise which resolves with a session state.
     */
    private waitForSession;
    /**
     * Gets session state.
     * @param url - a URL to get session state.
     * @param etag - an etag string.
     * @param accessToken - an optional access token.
     * @returns - a promise which resolves with a result string and response status.
     */
    private getSessionState;
    /**
     * Gets variable.
     * @param sessionId - a session id.
     * @param variable - a variable string.
     * @param accessToken - an optional access token.
     * @returns - a promise which resolves with a result that confirms to SessionVariable interface, etag string and status code.
     */
    getVariable(sessionId: string, variable: string, accessToken?: string): Promise<{
        result: SessionVariable;
        etag: string;
        status: number;
    }>;
}