118 lines
2.6 KiB
JavaScript
118 lines
2.6 KiB
JavaScript
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var _ = require('underscore');
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var Backbone = require('backbone');
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var syncAbort = require('./backbone/sync-abort');
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var STATUS = require('./query-base-status');
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var MAX_GET_LENGTH = 1024;
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var MAX_REPEATED_ERRORS = 3;
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module.exports = Backbone.Model.extend({
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initialize: function (attrs, options) {
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this.repeatedErrors = 0;
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this.listenTo(this, 'change:status', this._onStatusChanged);
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this.listenTo(this, 'change:ready', this._onReadyChanged);
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},
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/**
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* @override {Backbone.prototype.sync} abort ongoing request if there is any
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*/
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sync: syncAbort,
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getStatusValue: function () {
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return this.get('status');
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},
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isInInitialStatus: function () {
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return this.get('status') === STATUS.initial;
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},
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isFetched: function () {
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return this.get('status') === STATUS.fetched;
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},
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isFetching: function () {
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return this.get('status') === STATUS.fetching;
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},
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isErrored: function () {
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return this.get('status') === STATUS.errored;
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},
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isUnavailable: function () {
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return this.get('status') === STATUS.unavailable;
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},
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isDone: function () {
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return this.isFetched() || this.isErrored();
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},
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isInFinalStatus: function () {
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var finalStatuses = [STATUS.unavailable, STATUS.fetched, STATUS.errored];
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return _.contains(finalStatuses, this.get('status'));
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},
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canFetch: function () {
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var hasQuery = this.hasQuery();
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var isReady = this.get('ready');
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return hasQuery && isReady;
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},
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hasQuery: function () {
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return !!this.get('query');
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},
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shouldFetch: function () {
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return this.canFetch() && !this.isFetched() && !this.isFetching() && !this.isErrored();
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},
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resetFetch: function () {
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this.set('status', STATUS.unfetched);
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},
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/**
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* @override {Backbone.prototype.isNew} for this.destroy() to work (not try to send DELETE request)
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*/
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isNew: function () {
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return true;
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},
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hasRepeatedErrors: function () {
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return this.repeatedErrors >= MAX_REPEATED_ERRORS;
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},
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_onStatusChanged: function () {
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if (this.isInFinalStatus()) {
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this.trigger('inFinalStatus');
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}
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},
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_addChangeListener: function () {
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this.bind('change', this._onChange, this);
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},
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_removeChangeListener: function () {
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this.unbind('change', this._onChange, this);
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},
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_httpMethod: function () {
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return this._getSqlApiQueryParam().length > MAX_GET_LENGTH
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? 'POST'
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: 'GET';
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},
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_incrementRepeatedError: function () {
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this.repeatedErrors++;
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},
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_resetRepeatedError: function () {
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this.repeatedErrors = 0;
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},
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_onReadyChanged: function () {
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if (this.get('ready') && this.shouldFetch()) {
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this.fetch();
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}
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}
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});
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