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100 lines
3.9 KiB
JavaScript
100 lines
3.9 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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define(
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[],
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function () {
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// Set of connection states; changing among these states will be
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// reflected in the indicator's appearance.
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// CONNECTED: Everything nominal, expect to be able to read/write.
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// DISCONNECTED: HTTP failed; maybe misconfigured, disconnected.
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// PENDING: Still trying to connect, and haven't failed yet.
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var CONNECTED = {
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text: "Connected",
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glyphClass: "ok",
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description: "Connected to the domain object database."
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},
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DISCONNECTED = {
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text: "Disconnected",
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glyphClass: "err",
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description: "Unable to connect to the domain object database."
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},
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PENDING = {
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text: "Checking connection..."
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};
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/**
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* Indicator for the current ElasticSearch connection. Polls
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* ElasticSearch at a regular interval (defined by bundle constants)
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* to ensure that the database is available.
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* @constructor
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* @memberof platform/persistence/elastic
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* @implements {Indicator}
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* @param $http Angular's $http service
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* @param $interval Angular's $interval service
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* @param {string} path the URL to poll for elasticsearch availability
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* @param {number} interval the interval, in milliseconds, to poll at
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*/
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function ElasticIndicator($http, $interval, path, interval) {
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// Track the current connection state
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var self = this;
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this.state = PENDING;
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// Callback if the HTTP request to ElasticSearch fails
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function handleError() {
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self.state = DISCONNECTED;
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}
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// Callback if the HTTP request succeeds.
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function handleResponse() {
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self.state = CONNECTED;
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}
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// Try to connect to ElasticSearch, and update the indicator.
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function updateIndicator() {
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$http.get(path).then(handleResponse, handleError);
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}
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// Update the indicator initially, and start polling.
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updateIndicator();
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$interval(updateIndicator, interval, 0, false);
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}
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ElasticIndicator.prototype.getGlyph = function () {
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return "D";
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};
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ElasticIndicator.prototype.getGlyphClass = function () {
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return this.state.glyphClass;
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};
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ElasticIndicator.prototype.getText = function () {
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return this.state.text;
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};
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ElasticIndicator.prototype.getDescription = function () {
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return this.state.description;
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};
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return ElasticIndicator;
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}
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);
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