openmct/example/worker/src/FibonacciIndicator.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.
 *****************************************************************************/
/*global define*/

define(
    [],
    function () {
        "use strict";

        /**
         * Displays Fibonacci numbers in the status area.
         * @constructor
         */
        function FibonacciIndicator(workerService, $rootScope) {
            var latest,
                counter = 0,
                worker = workerService.run('example.fibonacci');

            function requestNext() {
                worker.postMessage([counter]);
                counter += 1;
            }

            function handleResponse(event) {
                latest = event.data;
                $rootScope.$apply();
                requestNext();
            }

            worker.onmessage = handleResponse;
            requestNext();

            return {
                getGlyph: function () {
                    return "?";
                },
                getText: function () {
                    return latest;
                },
                getGlyphClass: function () {
                    return "";
                },
                getDescription: function () {
                    return "";
                }
            };
        }

        return FibonacciIndicator;
    }
);