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110 lines
4.4 KiB
JavaScript
110 lines
4.4 KiB
JavaScript
/*****************************************************************************
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* Open MCT Web, Copyright (c) 2014-2015, 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 Web 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 Web 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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/*global define*/
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/**
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* Module defining TelemetryProvider. Created by vwoeltje on 11/12/14.
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*/
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define(
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[],
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function () {
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"use strict";
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/**
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* A telemetry aggregator makes many telemetry providers
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* appear as one.
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*
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* @constructor
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*/
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function TelemetryAggregator($q, telemetryProviders) {
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// Merge the results from many providers into one
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// result object.
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function mergeResults(results) {
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var merged = {};
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results.forEach(function (result) {
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Object.keys(result).forEach(function (k) {
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merged[k] = result[k];
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});
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});
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return merged;
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}
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// Request telemetry from all providers; once they've
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// responded, merge the results into one result object.
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function requestTelemetry(requests) {
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return $q.all(telemetryProviders.map(function (provider) {
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return provider.requestTelemetry(requests);
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})).then(mergeResults);
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}
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// Subscribe to updates from all providers
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function subscribe(callback, requests) {
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var unsubscribes = telemetryProviders.map(function (provider) {
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return provider.subscribe(callback, requests);
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});
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// Return an unsubscribe function that invokes unsubscribe
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// for all providers.
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return function () {
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unsubscribes.forEach(function (unsubscribe) {
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if (unsubscribe) {
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unsubscribe();
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}
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});
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};
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}
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return {
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/**
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* Request telemetry data.
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* @param {TelemetryRequest[]} requests and array of
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* requests to be handled
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* @returns {Promise} a promise for telemetry data
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* which may (or may not, depending on
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* availability) satisfy the requests
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*/
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requestTelemetry: requestTelemetry,
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/**
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* Subscribe to streaming updates to telemetry data.
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* The provided callback will be invoked as new
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* telemetry becomes available; as an argument, it
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* will receive an object of key-value pairs, where
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* keys are source identifiers and values are objects
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* of key-value pairs, where keys are point identifiers
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* and values are TelemetrySeries objects containing
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* the latest streaming telemetry.
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* @param {Function} callback the callback to invoke
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* @param {TelemetryRequest[]} requests an array of
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* requests to be subscribed upon
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* @returns {Function} a function which can be called
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* to unsubscribe
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*/
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subscribe: subscribe
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};
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}
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return TelemetryAggregator;
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}
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); |