2015-11-25 17:04:11 +00:00
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/*****************************************************************************
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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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// Return values to use when a persistence space is unknown,
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// and there is no appropriate provider to route to.
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var METHOD_DEFAULTS = {
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createObject: false,
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readObject: undefined,
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listObjects: [],
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updateObject: false,
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deleteObject: false
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};
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/**
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* Aggregates multiple persistence providers, such that they can be
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* utilized as if they were a single object. This is achieved by
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* routing persistence calls to an appropriate provider; the space
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* specified at call time is matched with the first provider (per
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* priority order) which reports that it provides persistence for
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* this space.
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*
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* @memberof platform/persistence/aggregator
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* @constructor
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* @implements {PersistenceService}
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* @param $q Angular's $q, for promises
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* @param {PersistenceService[]} providers the providers to aggregate
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*/
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function PersistenceAggregator($q, providers) {
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var providerMap = {};
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function addToMap(provider) {
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return provider.listSpaces().then(function (spaces) {
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spaces.forEach(function (space) {
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providerMap[space] = providerMap[space] || provider;
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});
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});
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}
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this.providerMapPromise = $q.all(providers.map(addToMap))
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2016-05-19 18:29:13 +00:00
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.then(function () {
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return providerMap;
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});
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2015-11-25 17:04:11 +00:00
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}
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PersistenceAggregator.prototype.listSpaces = function () {
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return this.providerMapPromise.then(function (map) {
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return Object.keys(map);
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});
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};
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Object.keys(METHOD_DEFAULTS).forEach(function (method) {
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PersistenceAggregator.prototype[method] = function (space) {
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var delegateArgs = Array.prototype.slice.apply(arguments, []);
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return this.providerMapPromise.then(function (map) {
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var provider = map[space];
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return provider ?
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provider[method].apply(provider, delegateArgs) :
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METHOD_DEFAULTS[method];
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});
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};
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});
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return PersistenceAggregator;
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}
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);
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