openmct/example/generator/GeneratorProvider.js

/*****************************************************************************
 * Open MCT, Copyright (c) 2014-2016, United States Government
 * as represented by the Administrator of the National Aeronautics and Space
 * Administration. All rights reserved.
 *
 * Open MCT is 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.
 *
 * Open MCT includes source code licensed under additional open source
 * licenses. See the Open Source Licenses file (LICENSES.md) included with
 * this source code distribution or the Licensing information page available
 * at runtime from the About dialog for additional information.
 *****************************************************************************/

define([
    './WorkerInterface'
], function (
    WorkerInterface
) {

    var REQUEST_DEFAULTS = {
        amplitude: 1,
        period: 10,
        offset: 0,
        dataRateInHz: 1
    };

    function GeneratorProvider() {
        this.workerInterface = new WorkerInterface();
    }

    GeneratorProvider.prototype.canProvideTelemetry = function (domainObject) {
        return domainObject.type === 'generator';
    };

    GeneratorProvider.prototype.supportsRequest =
        GeneratorProvider.prototype.supportsSubscribe =
            GeneratorProvider.prototype.canProvideTelemetry;

    GeneratorProvider.prototype.makeWorkerRequest = function (domainObject, request) {
        var props = [
            'amplitude',
            'period',
            'offset',
            'dataRateInHz'
        ];

        var workerRequest = {};

        props.forEach(function (prop) {
            if (domainObject.telemetry && domainObject.telemetry.hasOwnProperty(prop)) {
                workerRequest[prop] = domainObject.telemetry[prop];
            }
            if (request.hasOwnProperty(prop)) {
                workerRequest[prop] = request[prop];
            }
            if (!workerRequest[prop]) {
                workerRequest[prop] = REQUEST_DEFAULTS[prop];
            }
            workerRequest[prop] = Number(workerRequest[prop]);
        });

        return workerRequest;
    };

    GeneratorProvider.prototype.request = function (domainObject, request) {
        var workerRequest = this.makeWorkerRequest(domainObject, request);
        workerRequest.start = request.start;
        workerRequest.end = request.end;
        return this.workerInterface.request(workerRequest);
    };

    GeneratorProvider.prototype.subscribe = function (domainObject, callback, request) {
        var workerRequest = this.makeWorkerRequest(domainObject, request);
        return this.workerInterface.subscribe(workerRequest, callback);
    };

    return GeneratorProvider;
});