b98758daf8
Fix bug when filtering out namespaced identifiers when reading domain object models from persistence; filter operation was breaking the logic of pairing ids back to loaded models by index. Corrects behavior introduced to reduce latency when loading the telemetry hierarchy, part of WARP Server integration, WTD-644.
73 lines
2.6 KiB
JavaScript
73 lines
2.6 KiB
JavaScript
/*global define,Promise*/
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/**
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* Module defining PersistedModelProvider. 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 model service which reads domain object models from an external
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* persistence service.
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*
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* @constructor
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* @param {PersistenceService} persistenceService the service in which
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* domain object models are persisted.
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* @param $q Angular's $q service, for working with promises
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* @param {string} SPACE the name of the persistence space from which
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* models should be retrieved.
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*/
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function PersistedModelProvider(persistenceService, $q, SPACE) {
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// Load a single object model from persistence
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function loadModel(id) {
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return persistenceService.readObject(SPACE, id);
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}
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// Promise all persisted models (in id->model form)
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function promiseModels(ids) {
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// Package the result as id->model
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function packageResult(models) {
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var result = {};
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ids.forEach(function (id, index) {
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result[id] = models[index];
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});
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return result;
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}
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// Filter out "namespaced" identifiers; these are
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// not expected to be found in database. See WTD-659.
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ids = ids.filter(function (id) {
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return id.indexOf(":") === -1;
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});
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// Give a promise for all persistence lookups...
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return $q.all(ids.map(loadModel)).then(packageResult);
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}
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return {
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/**
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* Get models with the specified identifiers.
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*
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* This will invoke the underlying persistence service to
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* retrieve object models which match the provided
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* identifiers.
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*
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* Note that the returned object may contain a subset or a
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* superset of the models requested.
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*
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* @param {string[]} ids an array of domain object identifiers
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* @returns {Promise.<object>} a promise for an object
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* containing key-value pairs,
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* where keys are object identifiers and values
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* are object models.
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*/
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getModels: promiseModels
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};
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}
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return PersistedModelProvider;
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}
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); |