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<!DOCTYPE html>
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<title>JSDoc: Source: resource/Requester.js</title>
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<h1 class="page-title">Source: resource/Requester.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>//------------------------------------------------------------------------------
// Constructor scope
//------------------------------------------------------------------------------
/**
* Creates a new instance of the Requester class.
*
* @constructor
*
* @class
* @classdesc
*
* The Requester class uses URLLoader to download resource files. Once a file
* is downloaded, it is automatically added to a resource library and thus
* made available during runtime.
*/
rune.resource.Requester = function(resources) {
/**
* Request options.
*
* @type {rune.resource.RequesterOptions}
* @private
*/
this.m_arguments = null;
/**
* The URLLoader used to retrieve requested files.
*
* @type {rune.net.URLLoader}
* @private
*/
this.m_loader = null;
/**
* The number of files that have been requested.
*
* @type {number}
* @private
*/
this.m_numRequests = 0;
/**
* Reference to the resource library to which downloaded files should
* be added.
*
* @type {rune.resource.Resources}
* @private
*/
this.m_resources = resources;
};
//------------------------------------------------------------------------------
// Public prototype getter and setter methods
//------------------------------------------------------------------------------
/**
* The download progression represented by a floating point number between
* 0 and 1.
*
* @member {number} progress
* @memberof rune.resource.Requester
* @instance
* @readonly
*/
Object.defineProperty(rune.resource.Requester.prototype, "progress", {
/**
* @this rune.resource.Requester
* @ignore
*/
get : function() {
if (this.m_arguments) {
return 1 - (this.m_arguments['batch']['length'] / this.m_numRequests);
}
return 0;
}
});
//------------------------------------------------------------------------------
// Public prototype methods (API)
//------------------------------------------------------------------------------
/**
* Cancels file downloads.
*
* @returns {undefined}
*/
rune.resource.Requester.prototype.abort = function() {
this.m_disposeLoader();
if (this.m_arguments) {
this.m_arguments.exec("onAbort");
}
};
/**
* Begins downloading a batch of requested files.
*
* @param {Object} options Loader options.
*
* @returns {undefined}
*/
rune.resource.Requester.prototype.load = function(options) {
this.m_constructArguments(options);
this.m_constructLoader();
this.m_processRequests();
};
//------------------------------------------------------------------------------
// Internal prototype methods
//------------------------------------------------------------------------------
/**
* Clears this object from memory.
*
* @returns {undefined}
* @package
* @ignore
*/
rune.resource.Requester.prototype.dispose = function() {
this.m_disposeLoader();
this.m_disposeArguments();
this.m_resources = null;
};
//------------------------------------------------------------------------------
// Private prototype methods
//------------------------------------------------------------------------------
/**
* Creates the RequesterOptions object.
*
* @returns {undefined}
* @private
*/
rune.resource.Requester.prototype.m_constructArguments = function(options) {
this.m_disposeArguments();
if (this.m_arguments == null) {
this.m_arguments = new rune.resource.RequesterOptions(options);
this.m_numRequests = this.m_arguments['batch']['length'];
}
};
/**
* Creates the URLLoader object.
*
* @returns {undefined}
* @private
*/
rune.resource.Requester.prototype.m_constructLoader = function() {
this.m_disposeLoader();
if (this.m_loader == null) {
this.m_loader = new rune.net.URLLoader();
}
};
/**
* Deletes the RequesterOptions object.
*
* @returns {undefined}
* @private
*/
rune.resource.Requester.prototype.m_disposeArguments = function() {
if (this.m_arguments instanceof rune.resource.RequesterOptions) {
this.m_arguments.dispose();
this.m_arguments = null;
}
};
/**
* Deletes the URLLoader object.
*
* @returns {undefined}
* @private
*/
rune.resource.Requester.prototype.m_disposeLoader = function() {
if (this.m_loader instanceof rune.net.URLLoader) {
this.m_loader.abort();
this.m_loader = null;
}
};
/**
* Processes available requests. If the initial number of requests is zero,
* the callback is executed from the event loop. This is so that all callback
* calls are executed "asynchronously".
*
* @returns {undefined}
* @private
*/
rune.resource.Requester.prototype.m_processRequests = function() {
if (this.m_arguments) {
var request = this.m_arguments['batch'].shift();
if (request) {
this.m_processRequest(request);
} else {
if (this.m_numRequests == 0) {
var m_this = this;
window.setTimeout(function() {
m_this.m_arguments.exec("onComplete");
}, 0);
} else {
this.m_arguments.exec("onComplete");
}
}
} else throw new Error();
};
/**
* Processing a specific request.
*
* @param {rune.resource.Request} request Request to process.
*
* @returns {undefined}
* @private
*/
rune.resource.Requester.prototype.m_processRequest = function(request) {
if (this.m_loader) {
this.m_loader.load({
url: request['path'],
onComplete: function(response) {
response.asEncodedResource(function(obj) {
this.m_resources.add(request['name'], obj);
this.m_arguments.exec("onProgress", [
this['progress'],
request['name'],
response['size'],
response['type'],
obj
]);
request.dispose();
request = null;
this.m_processRequests();
}, this);
},
onError: function() {
this.m_arguments.exec("onError", [
request['name']
]);
},
scope: this
});
} else throw new Error();
};</code></pre>
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