lib6/transaction-promise.js

/**
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [https://neo4j.com]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var _a;
/* eslint-disable @typescript-eslint/promise-function-async */
import Transaction from './transaction';
/**
 * Represents a Promise<{@link Transaction}> object and a {@link Transaction} object.
 *
 * Resolving this object promise verifies the result of the transaction begin and returns the {@link Transaction} object in case of success.
 *
 * The object can still also used as {@link Transaction} for convenience. The result of begin will be checked
 * during the next API calls in the object as it is in the transaction.
 *
 * @access public
 */
class TransactionPromise extends Transaction {
    /**
     * @constructor
     * @param {object} args
     * @param {ConnectionHolder} args.connectionHolder - the connection holder to get connection from.
     * @param {function()} args.onClose - Function to be called when transaction is committed or rolled back.
     * @param {function(bookmarks: Bookmarks)} args.onBookmarks callback invoked when new bookmark is produced.
     * @param {function()} args.onConnection - Function to be called when a connection is obtained to ensure the connection
     * is not yet released.
     * @param {boolean} args.reactive whether this transaction generates reactive streams
     * @param {number} args.fetchSize - the record fetch size in each pulling batch.
     * @param {string} args.impersonatedUser - The name of the user which should be impersonated for the duration of the session.
     * @param {NotificationFilter} args.notificationFilter - The notification filter used for this transaction.
     * @param {NonAutoCommitApiTelemetryConfig} args.apiTelemetryConfig - The api telemetry configuration. Empty/Null for disabling telemetry
     */
    constructor({ connectionHolder, onClose, onBookmarks, onConnection, reactive, fetchSize, impersonatedUser, highRecordWatermark, lowRecordWatermark, notificationFilter, apiTelemetryConfig }) {
        super({
            connectionHolder,
            onClose,
            onBookmarks,
            onConnection,
            reactive,
            fetchSize,
            impersonatedUser,
            highRecordWatermark,
            lowRecordWatermark,
            notificationFilter,
            apiTelemetryConfig
        });
        this[_a] = 'TransactionPromise';
    }
    /**
     * Waits for the begin to complete.
     *
     * @param {function(transaction: Transaction)} onFulfilled - function to be called when finished.
     * @param {function(error: {message:string, code:string})} onRejected - function to be called upon errors.
     * @return {Promise} promise.
     */
    then(onfulfilled, onrejected) {
        return this._getOrCreateBeginPromise().then(onfulfilled, onrejected);
    }
    /**
     * Catch errors when using promises.
     *
     * @param {function(error: Neo4jError)} onRejected - Function to be called upon errors.
     * @return {Promise} promise.
     */
    catch(onrejected) {
        return this._getOrCreateBeginPromise().catch(onrejected);
    }
    /**
     * Called when finally the begin is done
     *
     * @param {function()|null} onfinally - function when the promise finished
     * @return {Promise} promise.
     */
    finally(onfinally) {
        return this._getOrCreateBeginPromise().finally(onfinally);
    }
    _getOrCreateBeginPromise() {
        if (this._beginPromise == null) {
            this._beginPromise = new Promise((resolve, reject) => {
                this._resolve = resolve;
                this._reject = reject;
                if (this._beginError != null) {
                    reject(this._beginError);
                }
                if (this._beginMetadata != null) {
                    resolve(this._toTransaction());
                }
            });
        }
        return this._beginPromise;
    }
    /**
     * @access private
     */
    _toTransaction() {
        return Object.assign(Object.assign({}, this), { run: super.run.bind(this), commit: super.commit.bind(this), rollback: super.rollback.bind(this), close: super.close.bind(this), isOpen: super.isOpen.bind(this), _begin: this._begin.bind(this) });
    }
    /**
     * @access private
     */
    _begin(bookmarks, txConfig) {
        return super._begin(bookmarks, txConfig, {
            onError: this._onBeginError.bind(this),
            onComplete: this._onBeginMetadata.bind(this)
        });
    }
    /**
     * @access private
     * @returns {void}
     */
    _onBeginError(error) {
        this._beginError = error;
        if (this._reject != null) {
            this._reject(error);
        }
    }
    /**
     * @access private
     * @returns {void}
     */
    _onBeginMetadata(metadata) {
        this._beginMetadata = metadata !== null && metadata !== void 0 ? metadata : {};
        if (this._resolve != null) {
            this._resolve(this._toTransaction());
        }
    }
}
_a = Symbol.toStringTag;
export default TransactionPromise;