jQuery AjaxQ(ueue)

jquery.ajaxq.js

// Copyright (C) 2011 Philip Plante <@pplante>
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

(function($) {
	var ajaxQueue = [];
	var activeConnections = 0;
	var maxConnections = 2;
	
	function queue_next() {
		console.log('ajaxq len:', ajaxQueue.length, 'active:', activeConnections, 'max:', maxConnections);
		if(ajaxQueue.length > 0 && activeConnections < maxConnections) {
			activeConnections += 1;
			
			var settings = ajaxQueue.pop();
			var req = $.ajax.apply($, settings);
			req.complete(function() {
				activeConnections -= 1;
				
				queue_next();
			});
		}
	}
	
	$.ajaxq = function() {
		var ajaxArgs = arguments;
		
		ajaxQueue.push(ajaxArgs);
		
		queue_next();
	};
})(jQuery);