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105 lines
3.2 KiB
JavaScript
105 lines
3.2 KiB
JavaScript
/*****************************************************************************
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* Open MCT, Copyright (c) 2014-2023, United States Government
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* as represented by the Administrator of the National Aeronautics and Space
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* Administration. All rights reserved.
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*
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* Open MCT is licensed under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0.
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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* Open MCT includes source code licensed under additional open source
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* licenses. See the Open Source Licenses file (LICENSES.md) included with
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* this source code distribution or the Licensing information page available
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* at runtime from the About dialog for additional information.
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*****************************************************************************/
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/**
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* Module defining EventTelemetryProvider. Created by chacskaylo on 06/18/2015.
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*/
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import messages from './transcript.json';
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class EventTelemetryProvider {
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constructor() {
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this.defaultSize = 25;
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}
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generateData(firstObservedTime, count, startTime, duration, name) {
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const millisecondsSinceStart = startTime - firstObservedTime;
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const utc = startTime + count * duration;
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const ind = count % messages.length;
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const message = messages[ind] + ' - [' + millisecondsSinceStart + ']';
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return {
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name,
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utc,
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message
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};
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}
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supportsRequest(domainObject) {
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return domainObject.type === 'eventGenerator';
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}
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supportsSubscribe(domainObject) {
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return domainObject.type === 'eventGenerator';
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}
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subscribe(domainObject, callback) {
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const duration = domainObject.telemetry.duration * 1000;
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const firstObservedTime = Date.now();
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let count = 0;
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const interval = setInterval(() => {
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const startTime = Date.now();
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const datum = this.generateData(
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firstObservedTime,
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count,
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startTime,
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duration,
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domainObject.name
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);
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count += 1;
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callback(datum);
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}, duration);
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return function () {
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clearInterval(interval);
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};
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}
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request(domainObject, options) {
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let start = options.start;
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const end = Math.min(Date.now(), options.end); // no future values
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const duration = domainObject.telemetry.duration * 1000;
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const size = options.size ? options.size : this.defaultSize;
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const data = [];
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const firstObservedTime = options.start;
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let count = 0;
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if (options.strategy === 'latest' || options.size === 1) {
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start = end;
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}
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while (start <= end && data.length < size) {
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const startTime = options.start + count;
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data.push(
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this.generateData(firstObservedTime, count, startTime, duration, domainObject.name)
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);
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start += duration;
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count += 1;
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}
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return Promise.resolve(data);
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}
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}
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export default EventTelemetryProvider;
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