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// Copyright 2008 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Loads a list of URIs in bulk. All requests must be a success
* in order for the load to be considered a success.
*
*/
goog.provide('goog.net.BulkLoader');
goog.require('goog.debug.Logger');
goog.require('goog.events.Event');
goog.require('goog.events.EventHandler');
goog.require('goog.events.EventTarget');
goog.require('goog.net.BulkLoaderHelper');
goog.require('goog.net.EventType');
goog.require('goog.net.XhrIo');
/**
* Class used to load multiple URIs.
* @param {Array.<string|goog.Uri>} uris The URIs to load.
* @constructor
* @extends {goog.events.EventTarget}
*/
goog.net.BulkLoader = function(uris) {
goog.events.EventTarget.call(this);
/**
* The bulk loader helper.
* @type {goog.net.BulkLoaderHelper}
* @private
*/
this.helper_ = new goog.net.BulkLoaderHelper(uris);
/**
* The handler for managing events.
* @type {goog.events.EventHandler}
* @private
*/
this.eventHandler_ = new goog.events.EventHandler(this);
};
goog.inherits(goog.net.BulkLoader, goog.events.EventTarget);
/**
* A logger.
* @type {goog.debug.Logger}
* @private
*/
goog.net.BulkLoader.prototype.logger_ =
goog.debug.Logger.getLogger('goog.net.BulkLoader');
/**
* Gets the response texts, in order.
* @return {Array.<string>} The response texts.
*/
goog.net.BulkLoader.prototype.getResponseTexts = function() {
return this.helper_.getResponseTexts();
};
/**
* Gets the request Uris.
* @return {Array.<string>} The request URIs, in order.
*/
goog.net.BulkLoader.prototype.getRequestUris = function() {
return this.helper_.getUris();
};
/**
* Starts the process of loading the URIs.
*/
goog.net.BulkLoader.prototype.load = function() {
var eventHandler = this.eventHandler_;
var uris = this.helper_.getUris();
this.logger_.info('Starting load of code with ' + uris.length + ' uris.');
for (var i = 0; i < uris.length; i++) {
var xhrIo = new goog.net.XhrIo();
eventHandler.listen(xhrIo,
goog.net.EventType.COMPLETE,
goog.bind(this.handleEvent_, this, i));
xhrIo.send(uris[i]);
}
};
/**
* Handles all events fired by the XhrManager.
* @param {number} id The id of the request.
* @param {goog.events.Event} e The event.
* @private
*/
goog.net.BulkLoader.prototype.handleEvent_ = function(id, e) {
this.logger_.info('Received event "' + e.type + '" for id ' + id +
' with uri ' + this.helper_.getUri(id));
var xhrIo = /** @type {goog.net.XhrIo} */ (e.target);
if (xhrIo.isSuccess()) {
this.handleSuccess_(id, xhrIo);
} else {
this.handleError_(id, xhrIo);
}
};
/**
* Handles when a request is successful (i.e., completed and response received).
* Stores thhe responseText and checks if loading is complete.
* @param {number} id The id of the request.
* @param {goog.net.XhrIo} xhrIo The XhrIo objects that was used.
* @private
*/
goog.net.BulkLoader.prototype.handleSuccess_ = function(
id, xhrIo) {
// Save the response text.
this.helper_.setResponseText(id, xhrIo.getResponseText());
// Check if all response texts have been received.
if (this.helper_.isLoadComplete()) {
this.finishLoad_();
}
xhrIo.dispose();
};
/**
* Handles when a request has ended in error (i.e., all retries completed and
* none were successful). Cancels loading of the URI's.
* @param {number|string} id The id of the request.
* @param {goog.net.XhrIo} xhrIo The XhrIo objects that was used.
* @private
*/
goog.net.BulkLoader.prototype.handleError_ = function(
id, xhrIo) {
// TODO(user): Abort all pending requests.
// Dispatch the ERROR event.
this.dispatchEvent(goog.net.EventType.ERROR);
xhrIo.dispose();
};
/**
* Finishes the load of the URI's. Dispatches the SUCCESS event.
* @private
*/
goog.net.BulkLoader.prototype.finishLoad_ = function() {
this.logger_.info('All uris loaded.');
// Dispatch the SUCCESS event.
this.dispatchEvent(goog.net.EventType.SUCCESS);
};
/** @override */
goog.net.BulkLoader.prototype.disposeInternal = function() {
goog.net.BulkLoader.superClass_.disposeInternal.call(this);
this.eventHandler_.dispose();
this.eventHandler_ = null;
this.helper_.dispose();
this.helper_ = null;
};
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