openmct/example/generator/StateGeneratorProvider.js
2018-07-02 14:18:29 -07:00

83 lines
2.8 KiB
JavaScript

/*****************************************************************************
* Open MCT, Copyright (c) 2014-2017, 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([
], function (
) {
function StateGeneratorProvider() {
}
function pointForTimestamp(timestamp, duration, name) {
return {
name: name,
utc: Math.floor(timestamp / duration) * duration,
value: Math.floor(timestamp / duration) % 2
};
}
StateGeneratorProvider.prototype.supportsSubscribe = function (domainObject) {
return domainObject.type === 'example.state-generator';
};
StateGeneratorProvider.prototype.subscribe = function (domainObject, callback) {
var duration = domainObject.telemetry.duration * 1000;
var interval = setInterval(function () {
var now = Date.now();
var datum = pointForTimestamp(now, duration, domainObject.name);
datum.value += "";
callback(datum);
}, duration);
return function () {
clearInterval(interval);
};
};
StateGeneratorProvider.prototype.supportsRequest = function (domainObject, options) {
return domainObject.type === 'example.state-generator';
};
StateGeneratorProvider.prototype.request = function (domainObject, options) {
var start = options.start;
var end = options.end;
var duration = domainObject.telemetry.duration * 1000;
if (options.strategy === 'latest' || options.size === 1) {
start = end;
}
var data = [];
while (start <= end && data.length < 5000) {
data.push(pointForTimestamp(start, duration, domainObject.name));
start += duration;
}
return Promise.resolve(data);
};
return StateGeneratorProvider;
});