55 lines
2.5 KiB
JavaScript
55 lines
2.5 KiB
JavaScript
/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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define(['jquery', 'underscore', 'backbone', 'classes/cache'],
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function ($, _, Backbone, Cache) {
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var CachedCollection = Backbone.Collection.extend({
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cacheName: null,
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fetch: function (options) {
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options = _.defaults(options || {}, {parse: true});
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var deferred = new $.Deferred(),
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self = this;
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var cachedItem = Cache.get(this.cacheName);
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if (cachedItem !== null)
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{
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window.setTimeout(function () {
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self[options.reset ? 'reset' : 'set'](false, options);
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deferred.resolve(cachedItem);
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self.push(cachedItem);
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self.trigger('sync', self, false, options);
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if (_.isFunction(options.success)) {
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options.success(self, false, options);
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}
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return deferred;
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}, 0);
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}
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else
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{
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// Delegate to the actual fetch method and store the attributes in the cache
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var jqXHR = Backbone.Collection.prototype.fetch.apply(this, arguments);
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// resolve the returned promise when the AJAX call completes
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jqXHR.done(_.bind(deferred.resolve, this, this))
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// Set the new data in the cache
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.done(_.bind(
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function (a, b, c) {
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Cache.set(self.cacheName, a);
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}
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, null, this, options))
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// Reject the promise on fail
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.fail(_.bind(deferred.reject, this, this));
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deferred.abort = jqXHR.abort;
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// return a promise which provides the same methods as a jqXHR object
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return deferred;
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}
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}
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});
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return CachedCollection;
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});
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