import { IDbLogger } from '../interfaces/db-logger';
import { DbHelperModuleConfig } from '../db-helper-module-config';
import { DbQuery } from '../models/db-query.model';
import { Observable } from 'rxjs/Observable';
import { QueryResult } from '../interfaces/query-result.interface';
import 'rxjs/add/operator/share';
/**
 * @private
 * @class QueryManager
 *
 * @description
 * This class is a singleton manging query
 * This manager has not to be exposed, it is used to handle queries
 * with the connector. It stack it during connector is not ready and
 * release it when connector ca query
 *
 * @author  Olivier Margarit
 * @since   0.1
 */
export declare class QueryManager {
    /**
     * @static
     * @private
     * @property {QueryManager} instance private reference to the model manager instance
     */
    private static instance;
    private loggerValue;
    /**
     * @private
     * @property {Array<PendingDbQuery>} pendingDbQueries stack of queries to fire when the
     * connector is ready
     */
    private pendingDbQueries;
    /**
     * @private
     * @property {Array<PendingDbQuery>} pendingBatchDbQueries stack of queries to fire in a single transaction
     */
    private pendingBatchDbQueries;
    /**
     * @private
     * @property {boolean} isReady flag that should pas to true only when
     * query can be sent
     */
    private isReady;
    /**
     * @private
     * @property {boolean} isInitializationFailed flag to reject all queries
     * in case of connector activation failure
     */
    private isInitializationFailed;
    /**
     * @private
     * @property {QueryConnector | undefined} queryConnector query connector that handle queries
     * to real db
     */
    private queryConnector;
    /**
     * @private
     * @property {ModelMigration | undefined} modelMigration that handle migration on version change
     */
    private modelMigration;
    /**
     * @private
     * @property {any} batchLock batch locker that can fire transaction. This locker prevent batch to collide.
     * @since 0.2
     */
    private batchLock;
    /**
     * @private
     * @property {Subject<any> | undefined} batchSubject an Observable where multiple batch transaction owner an subscribe
     * @since 0.2
     */
    private batchSubject;
    private supportRowidValue;
    readonly logger: IDbLogger;
    readonly supportRowid: boolean;
    /**
     * @static
     * @public
     * @method init is a part of the private API, config is submitted to
     * pass connector, model migration and other config. see {@link NgDbHelperModuleConfig}
     * for more informations
     *
     * @param {NgDbHelperModuleConfig} config the module configuration with connector instance and model migration
     *
     * @return {QueryManager} the initialized instance
     */
    static init(config: DbHelperModuleConfig): QueryManager;
    /**
     * @static
     * @public
     * @method getInstance to get the unique QueryManager instance
     *
     * @return {QueryManager} the instance
     */
    static getInstance(): QueryManager;
    /**
     * @private
     * @constructor private constructor to preserve from other instance creation
     */
    private constructor();
    /**
     * @private
     * @method onQueryConnectorReady is called when query connector is ready to
     * manage model migration then dequeuing  each pending queries
     */
    private onQueryConnectorReady();
    /**
     * @private
     * @method onInitializationFailure is called on initilization failure to cancel
     * all started queries and nexts
     *
     * @param {Error} err the error return by the initialization failure
     */
    private onInitializationFailure(err);
    /**
     * @private
     * @method dequeuePendingRequest is called to dequeue pending request
     */
    private dequeuePendingRequest();
    /**
     * @public
     * @method startBatch start transaction for multiple queries
     * @param {any} locker the locker that can fire the transaction if none is set
     */
    startBatch(locker: any): void;
    /**
     * @public
     * @method query private API to start queries, it check if queries can be executed
     * If initialization failed, error is sent back. If connector is not ready, query will
     * be stack until connector ready signal
     *
     * @param {DbQuery} dbQuery   query information with params
     *
     * @return {Observable<QueryResult<any>>}   in case of success, {@link QueryResult<any>} is passed
     *                                          in case of failure, {@link QueryError} is passed
     */
    query(dbQuery: DbQuery): Observable<QueryResult<any>>;
    /**
     * @public
     * @method queryBatch should only be called from {@link QueryBatch} function.
     *
     * @param locker the locker passed to startBatch that allow queries releasing
     *
     * @return {Observable<QueryResult<any>>}   in case of success, {@link QueryResult<any>} is passed
     *                                          in case of failure, {@link QueryError} is passed
     *
     * @since 0.2
     */
    execBatch(locker: any): Observable<QueryResult<any>>;
    /**
     * @private
     * @method executeQuery should be called only when connector is ready
     *
     * @param {DbQuery} dbQuery   query information with params
     * @param {Observer} observer  observer to manage query callback
     *
     * @return {Observable<QueryResult<any>>}   in case of success, {@link QueryResult<any>} is passed
     *                                          in case of failure, {@link QueryError} is passed
     */
    private executeQuery(dbQuery, observer);
}