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Viewing file:     class.BackgroundManager.js (4.76 KB)      -rw-r--r--

/**
 * @package info.ajaxplorer.plugins
 * 
 * Copyright 2007-2009 Charles du Jeu
 * This file is part of AjaXplorer.
 * The latest code can be found at http://www.ajaxplorer.info/
 * 
 * This program is published under the LGPL Gnu Lesser General Public License.
 * You should have received a copy of the license along with AjaXplorer.
 * 
 * The main conditions are as follow : 
 * You must conspicuously and appropriately publish on each copy distributed 
 * an appropriate copyright notice and disclaimer of warranty and keep intact 
 * all the notices that refer to this License and to the absence of any warranty; 
 * and give any other recipients of the Program a copy of the GNU Lesser General 
 * Public License along with the Program. 
 * 
 * If you modify your copy or copies of the library or any portion of it, you may 
 * distribute the resulting library provided you do so under the GNU Lesser 
 * General Public License. However, programs that link to the library may be 
 * licensed under terms of your choice, so long as the library itself can be changed. 
 * Any translation of the GNU Lesser General Public License must be accompanied by the 
 * GNU Lesser General Public License.
 * 
 * If you copy or distribute the program, you must accompany it with the complete 
 * corresponding machine-readable source code or with a written offer, valid for at 
 * least three years, to furnish the complete corresponding machine-readable source code. 
 * 
 * Any of the above conditions can be waived if you get permission from the copyright holder.
 * AjaXplorer is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Description : Manage background tasks and display their state.
 */
BackgroundManager = Class.create({
	queue: $A([]),
	initialize:function(actionManager){
		this.actionManager = actionManager;
		this.panel = new Element('div').addClassName('backgroundPanel');
		if(Prototype.Browser.IE){
			this.panel.setStyle({width:'35%'});
		}
		this.panel.hide();
		this.working = false;
		document.body.insert(this.panel);
	},
	
	queueAction:function(actionName, parameters,messageId){
		var actionDef = new Hash();
		actionDef.set('name', actionName);
		actionDef.set('messageId', messageId);
		actionDef.set('parameters', parameters);
		this.queue.push(actionDef);
	},
	
	next:function(){
		if(!this.queue.size()){
			 this.finished();
			 return;
		}
		if(this.working) return;
		var actionDef = this.queue[0];
		var connexion = new Connexion();
		connexion.setParameters(actionDef.get('parameters'));
		connexion.addParameter('get_action', actionDef.get('name'));		
		connexion.onComplete = function(transport){
			var xmlResponse = transport.responseXML;
			if(xmlResponse == null || xmlResponse.documentElement == null) {
				alert(transport.responseText);
				this.working = false;
				this.next();
				return;
			}
			this.parseAnswer(transport.responseXML);
			this.working = false;
		}.bind(this);
		connexion.sendAsync();		
		var imgString = '<img src="'+ajxpResourcesFolder+'/images/loadingImage.gif" height="16" width="16" align="absmiddle">';
		this.panel.update(imgString+' '+actionDef.get('messageId'));
		this.panel.show();
		new Effect.Corner(this.panel, "round 8px bl");
		new Effect.Corner(this.panel, "round 8px tl");
		this.queue.shift();
		this.working = true;
	},
	
	parseAnswer:function(xmlResponse){
		var childs = xmlResponse.documentElement.childNodes;	
		
		for(var i=0; i<childs.length;i++)
		{
			if(childs[i].tagName == "message")
			{
				var type = childs[i].getAttribute('type');
				if(type != 'SUCCESS'){
					return this.interruptOnError(childs[i].firstChild.nodeValue);
				}
			}
			else if(childs[i].nodeName == "trigger_bg_action"){
				var name = childs[i].getAttribute("name");
				var messageId = childs[i].getAttribute("messageId");
				var parameters = new Hash();
				for(var j=0;j<childs[i].childNodes.length;j++){
					var paramChild = childs[i].childNodes[j];
					if(paramChild.tagName == 'param'){
						parameters.set(paramChild.getAttribute("name"), paramChild.getAttribute("value"));
					}
				}
				this.queueAction(name, parameters, messageId);
			}
		}
		this.working = false;
		this.next();
	},
	
	interruptOnError:function(errorMessage){
		if(this.queue.size()) this.queue = $A([]);
		
		this.panel.update(errorMessage);
		this.panel.insert(this.makeCloseLink());
		this.working = false;
	},
	
	finished:function(){		
		this.working = false;
		this.panel.hide();
	},
	
	makeCloseLink:function(){
		var link = new Element('a', {href:'#'}).update('Close').observe('click', function(e){
			Event.stop(e);
			this.panel.hide();
		}.bind(this));
		return link;
	},
	
	addStub: function(){		
		this.queueAction('local_to_remote', new Hash(), 'Stubing a 10s bg action');
	}
});