schedulerjs/dist/scheduler.js

A promise execution flow control library

'use strict';

Object.defineProperty(exports, '__esModule', {
    value: true
});

var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();

var _get = function get(_x, _x2, _x3) { var _again = true; _function: while (_again) { var object = _x, property = _x2, receiver = _x3; desc = parent = getter = undefined; _again = false; if (object === null) object = Function.prototype; var desc = Object.getOwnPropertyDescriptor(object, property); if (desc === undefined) { var parent = Object.getPrototypeOf(object); if (parent === null) { return undefined; } else { _x = parent; _x2 = property; _x3 = receiver; _again = true; continue _function; } } else if ('value' in desc) { return desc.value; } else { var getter = desc.get; if (getter === undefined) { return undefined; } return getter.call(receiver); } } };

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }

function _inherits(subClass, superClass) { if (typeof superClass !== 'function' && superClass !== null) { throw new TypeError('Super expression must either be null or a function, not ' + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

var _events = require('events');

/**
 * Scheduler class. Starts Sequences in parallel
 */

var Scheduler = (function (_EventEmitter) {
    _inherits(Scheduler, _EventEmitter);

    /**
     * Initializes the object
     */

    function Scheduler() {
        _classCallCheck(this, Scheduler);

        _get(Object.getPrototypeOf(Scheduler.prototype), 'constructor', this).call(this);

        this.sequences = [];
        this.sequencesDone = 0;
    }

    /**
     * Adds a sequence
     * @param  {Sequence} sequence The sequence to add
     * @return {Scheduler} This object (chaining)
     */

    _createClass(Scheduler, [{
        key: 'add',
        value: function add(sequence) {
            var _this = this;

            this.sequences.push(sequence);

            sequence.on('error', function (reason) {
                _this.emit('error', reason);
            });

            sequence.on('finished', function () {
                _this._checkFinished();
            });

            return this;
        }

        /**
         * Adds a named sequence
         * @param  {String} sequenceName The sequence name
         * @param  {Sequence} sequence   The sequence to add
         * @return {Scheduler} This object (chaining)
         */
    }, {
        key: 'set',
        value: function set(sequenceName, sequence) {
            this.add(sequence);
            this[sequenceName] = sequence;

            return this;
        }

        /**
         * Starts all the sequences
         */
    }, {
        key: 'start',
        value: function start() {
            var _this2 = this;

            // use nextTick to allow events after start
            process.nextTick(function () {
                _this2.emit('started');

                if (_this2.sequences.length === 0) {
                    _this2.emit('finished');
                }

                _this2.sequences.forEach(function (sequence) {
                    sequence.start();
                });
            });
        }

        /**
         * Stops all the sequences
         */
    }, {
        key: 'stop',
        value: function stop() {
            var _this3 = this;

            process.nextTick(function () {
                _this3.sequences.forEach(function (sequence) {
                    sequence.stop();
                });

                _this3.emit('stopped');
            });
        }

        /**
         * Checks wether all the sequences are completed or nto
         * @private
         */
    }, {
        key: '_checkFinished',
        value: function _checkFinished() {
            var _this4 = this;

            ++this.sequencesDone;

            if (this.sequencesDone === this.sequences.length) {
                // ensure scheduler finish after all sequences
                process.nextTick(function () {
                    _this4.emit('finished');
                });
            }
        }
    }]);

    return Scheduler;
})(_events.EventEmitter);

exports['default'] = Scheduler;
module.exports = exports['default'];