Initial commit

lib/assets/javascripts/builder/data/query-base-model.js

@@ -0,0 +1,117 @@
+var _ = require('underscore');
+var Backbone = require('backbone');
+var syncAbort = require('./backbone/sync-abort');
+var STATUS = require('./query-base-status');
+var MAX_GET_LENGTH = 1024;
+var MAX_REPEATED_ERRORS = 3;
+
+module.exports = Backbone.Model.extend({
+  initialize: function (attrs, options) {
+    this.repeatedErrors = 0;
+
+    this.listenTo(this, 'change:status', this._onStatusChanged);
+    this.listenTo(this, 'change:ready', this._onReadyChanged);
+  },
+
+  /**
+   * @override {Backbone.prototype.sync} abort ongoing request if there is any
+   */
+  sync: syncAbort,
+
+  getStatusValue: function () {
+    return this.get('status');
+  },
+
+  isInInitialStatus: function () {
+    return this.get('status') === STATUS.initial;
+  },
+
+  isFetched: function () {
+    return this.get('status') === STATUS.fetched;
+  },
+
+  isFetching: function () {
+    return this.get('status') === STATUS.fetching;
+  },
+
+  isErrored: function () {
+    return this.get('status') === STATUS.errored;
+  },
+
+  isUnavailable: function () {
+    return this.get('status') === STATUS.unavailable;
+  },
+
+  isDone: function () {
+    return this.isFetched() || this.isErrored();
+  },
+
+  isInFinalStatus: function () {
+    var finalStatuses = [STATUS.unavailable, STATUS.fetched, STATUS.errored];
+    return _.contains(finalStatuses, this.get('status'));
+  },
+
+  canFetch: function () {
+    var hasQuery = this.hasQuery();
+    var isReady = this.get('ready');
+
+    return hasQuery && isReady;
+  },
+
+  hasQuery: function () {
+    return !!this.get('query');
+  },
+
+  shouldFetch: function () {
+    return this.canFetch() && !this.isFetched() && !this.isFetching() && !this.isErrored();
+  },
+
+  resetFetch: function () {
+    this.set('status', STATUS.unfetched);
+  },
+
+  /**
+   * @override {Backbone.prototype.isNew} for this.destroy() to work (not try to send DELETE request)
+   */
+  isNew: function () {
+    return true;
+  },
+
+  hasRepeatedErrors: function () {
+    return this.repeatedErrors >= MAX_REPEATED_ERRORS;
+  },
+
+  _onStatusChanged: function () {
+    if (this.isInFinalStatus()) {
+      this.trigger('inFinalStatus');
+    }
+  },
+
+  _addChangeListener: function () {
+    this.bind('change', this._onChange, this);
+  },
+
+  _removeChangeListener: function () {
+    this.unbind('change', this._onChange, this);
+  },
+
+  _httpMethod: function () {
+    return this._getSqlApiQueryParam().length > MAX_GET_LENGTH
+      ? 'POST'
+      : 'GET';
+  },
+
+  _incrementRepeatedError: function () {
+    this.repeatedErrors++;
+  },
+
+  _resetRepeatedError: function () {
+    this.repeatedErrors = 0;
+  },
+
+  _onReadyChanged: function () {
+    if (this.get('ready') && this.shouldFetch()) {
+      this.fetch();
+    }
+  }
+});