Flex :: Difficult Syncronization Problem With Commands (in Cairngorm)?
Jan 8, 2010
I have a dataGrid with a dataProvider "documents"A column of the datagrid has a labelFunction that gets the project_id field of the document, and returns the project name, from a bindable variable "projects"Now, I dispatch the events to download from the server the documents and the projects, but If the documents get downloaded before the projects, then the label function gives an error (no "projects" variable)Therefore, I must serialize the commands being executed: the getDocuments command must execute only after the getProjects command.In the real world, though, I have dozens of resources being downloaded, and those command are not always grouped together (so I can't for example execute the second command from the onSuccess() method of the first, because not always they must be executed together..)..
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Oct 1, 2009
I see the benefit of asynchronous commands (waiting for server responses...) but in my flex app it creates me more problem than anything. Here's what I want: EVERY command executes only after the previous one returned (to result or fault function) And I'd like to do this as easily as possible.. by the way the GUI must become irresponsive (maybe a wait message) while a long command is being executed (I could show the wait message in the execute function and remove it in the fault or result function..)
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Mar 21, 2009
I have got stuck in an issue of syncronization of sound looping.What i have got issue is when the loaded sound start again it doesnot give the the sound in syncronize way. it gives a click sound sound then start agains.while on testing the song in the any song player it will not give such a click sound. There are smooth sound in that.
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Jul 22, 2010
I found a lot of interesting info in the 'hidden features of...' series. I am very new to cairngorm . What are some of the hidden features of cairngorm.
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Jul 28, 2010
What is the use to event extend the cairngorm event in cairngorm framework.?
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Aug 12, 2010
I am not using FlexBuilder, I'm using the free Flex SDK with TextMate. I'm having some trouble figuring out what this FlexBuilder process actually does behind all the nice dialogs and things, so that I can do the same thing by tweaking whatever the relevant file is, but Googling just points me at similar instructions telling me to use FlexBuilder.
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Oct 8, 2009
I ran into a problem.I'm doing a GIS program using flex. There's a map in my Application,when I click one icon on the map,windowA pops up,when I click a link inside windowA,windowB pops up,but here my problem coming out,when I close windowB and click the link inside windowA another time,Two windowB pop up...
[Code]...
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Feb 13, 2010
From what I understand a framework reduces complexity in areas that are common, like a log-in system. I use ASP.NET MVC at work and have done some work in Zend Framework but do not get how a framework helps with client side development. The reason ASP.NET MVC is used at work is for Unit Testing - does a Flex framework help with this too? why I should or should not use a framework with Flex?
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Jun 17, 2010
I wish to do my project in mvc pattern. so I chose cairngorm framework and just read some of the document about this framework.But I cant understand deeply to do project using this framework. Have any methods or examples to study doing project in cairngorm framework??
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Nov 30, 2010
I was wondering if Parsley framework is compatible for Flex Hero Mobile 4.5? I seem to get a warning saying it's not compatible.
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Jul 5, 2011
In Cairngorm (Flex Framework), there is Model Locator Pattern, which is similar to Global variables, is it a right pattern, Adobe is saying for flex its best pattern
[Code]...
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Jul 13, 2011
I have a TitleWindow that I open up... and I have 6 states defined.I am using the Presentation model pattern for all of my views. When I tell my window to go to XXX state, the controls have to initialize since the states in flex use lazy loading. so... my PM code that says myTextArea.text bombs out and say "cannot access..." so as a work around, I made some creationComplete events on my controls to register the control with the PM. So when the state changes, the textarea finally initializes and on creationComplete calls PM.registerTextArea() which sets a reference to it. then in that function I run my code... myTextArea.text.. etc.
This seems like such a ugly hack that I hate it. Is there any way to wait until the entire state in created then call code on the PM? I have tried enterstate... but this event seems to fire before the state controls are ready.I tried to add a comment, but I guess editing is the only way I can do this...I am doing something slightly off straight PM. Every view has a viewController (as I call them). Its kinda my own hybrid of a delegate / dataprovider. But this is moot. It's the flex component lifecycle when dealing with states that is the pain.if you change state.. there is no event to say "all my components in this state are ready".only event to say "we changed state". so my code that fires on state change is trying to talk to components that aren't ready yet.So from what I see, there seems to be no design pattern or perfect way to ensure that all components are created in a state unless using creationComplete on every component in the state to register it is ready... if you don't, you get a race condition. Regardless of frameworks or design patterns, this seems to be a root issue.
I am trying to attach video to a display once I get to that state. This is done via addchild. regardless of where I do it.. I need to know that the videoDisplay is done loading before I call addchild. I even tried currentStateChange event since docs say that fires last... but alas.. the components in the state are still initializing. So it seems that creationComplete is my only option. Maybe the only sane way to keep to clean code is to create the entire thing(videodisplay and video) using as once the state is entered. I just hoped the flex framework had events to ehlp me here rather than buiilding everything on the fly in as.
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Aug 30, 2011
I need to read the URL that the browser shows when a Flex application is called because I would to reference it in a mxml configuring Cairngorm remote objects. The goal I would reach is to automatically configure Cairngorm services from environment to environment (dev,test,qa,prod) without statically set the value in the mxml or other ActionScript. Since the Flex client is deployed in the root of the war of the webapp, it's enough to read where the browser is pointing.
I have written a class that is doing so:
public class ConfigServer {
public function ConfigServer() {
var loaderUrl:String = FlexGlobals.topLevelApplication.loaderInfo.loaderURL;
var urlToSet:String = <loaderURL-string-manipulation>;
_serverUrl = urlToSet;
[Code] .....
But whenever I call the ConfigServer constructor and for every (known to me) technique I applied (statics or singletons or public ro so on), I have always had the same error:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at org.fao.fapda.util::ConfigServer()[C:devworkspacesFAPDA runkFAPDA-clientsrcorgfaofapdautilConfigServer.as:8]
Cairngorm services initialization is done as follow:
<fx:Declarations><cut/>
<services:FAPDAServices id="services"/>
<cut/></fx:Declarations>
And the problem is that FAPDAServices.mxml is read runs before FlexGlobals is valid. Is there a point in the Flex Application lifecycle where such loaderURL is defined so that I can construct ConfigServer? When in startup events that initialization in done?
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Aug 2, 2009
I'm having a hard time building a Cairngorm Flex3 app that connects to a rails app. I'm used to rails DRY approad, and the Convention over Configuration thing too.. and Cairngorm in awful at these.
How do you keep you flex code as DRY as possible? I've implemented a generic delegate to avoid a delegate for each command, at least.
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Oct 31, 2010
Has anyone tried to compile a flex project that uses Cairngorm with command line?
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Jan 23, 2012
I have a few values in Java VO, and using cairgorm framework, i had mapping the Java VO to Action script VO in Flex and given same variables name as java Vo variables name. Now the Vo is mapping fine and when looking the result all variables are displaying as null. Can i know the reason for that.Java returning list of VO's.
package com.configuration
{
import com.adobe.cairngorm.vo.IValueObject;
[code]......
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Jan 14, 2010
how to incorporate FileReference method like Upload into a Cairngorm architecture.Specifically, I would think to fire an event with the File in it, and that's fine. But how would one then be able to listen for e.g. Progress Events?One thing I thought is to have the delegate fire off progress events that are listened for in the View.
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Oct 7, 2010
I have a live chart. I need to refresh the chart with 5 seconds time interval.
For displaying the live chart i disptach the event (myEvent) extends cairngormevent.
And after 5 seconds , the same event has to dispatch again adn get the data to display thelie cart.
And how the event dispatch after 5 seconds with out any manula call..?
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May 5, 2011
Could tools like SWFAddress be used in some clever ways to alleviate an existing client-server architecture. I see possibilities to even introduce REST-like pattern mapping or something like that.
What I am currently doing is following all the Cairngorm guidleines, which has already led to a bunch of commands which all make sense, but inclusing the business delegates, and all that stuff, I am getting into a hard time extending and refactoring the application Anyway, what I thought of was somehow reducing the number of application events flying around, and the number of commands responding to them. Actualy, I am quite OK even coupling the view with some logic, if I can get rd of some layer complexity.
What I mean by that: perhaps, I could bind a button click to a url pattern (or use SWFaddress to change the url globally). On the other end, I wll be waiting for changes of the url, reformat it, and pass it onto a service delegate, which has the necessary mappings in mind, so it knows what method to call, or it could even pass the url directly to an HTTPSErvice. The delegate will then deal with the server response, and update the model, which through the bindings will update the view.
I am not going to completely ditch commands. I thing that they are good for scheduling of the internal interactions (within the client itself), but I'd like to abstain from using them for communication with the server.
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Jun 5, 2009
I recently completed a project for a custom report UI in Flex. Now, I've been tasked with creating a new application that is essentially a "lite" version of the original UI. It will include only a few of the options that are in the original application. Also, it needs to be a separate application.
I do not want to duplicate my code, so I am planning on moving a bunch of the classes from the original application to a new library that can be shared by both applications. However, I'm trying to figure out how to make this work in my MVC environment.
For example, I have an Accordion component that lets users filter several items. Each Accordion child is an instance of a custom component with two lists (one for entities available for selection, the other for the entities the user has selected). Each child component has properties bound to the Model and functions that call Cairngorm Events.[code]...
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Jun 5, 2009
I have created a few Event and Command classes for use in my Cairngorm projects.For example, I created an class that extends URL... that allows me to set callback functions upon completion or failure of the corresponding Command. To accomplish this, I also had to create a new Class that implements com.adobe.cairngorm.commands.ICommand that I extend for all Commands in my projects.Now, I want to use these two classes across all of my Cairngorm applications. What is the best way to do this? Should I just edit the Cairngorm source for CairngormEvent and ICommandand recompile the Cairngorm MVC (is that even possible)? Or add my two classes to the Cairngorm source and recompile the Cairngorm MVC? Or should I just add them to a shared library?I've chose the third option for now, but this requires that I reference the Cairngorm library in both my library and each project. I am wondering if there is a better practice and what the benefits are.
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Dec 25, 2010
what's the size of the bootstrap code for cairngorm framework which is based on flex?
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Mar 18, 2010
Is there another way to write this array in AS2?:
Code:
var img_array:Array = new Array({img:"nav_thumb1", img:"thumb_01"}, {img:"nav_thumb2", img:"thumb_02"}, {img:"nav_thumb3", img:"thumb_03"});
This is pretty simple, but when you need more values inside each element, it gets difficult to maintain.I know I could probably do this using XML, but I'm trying to learn all about arrays
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Nov 5, 2009
I seem to be getting the following error when I try to access a Remote Java class (on Spring/BlazeDS) from the Flex/Cairngorm application. I am going crazy at the moment trying to see what is wrong
[Code]...
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Nov 17, 2009
I've used jqUploader for a while but I find that it will occasionally fail to work on certain browsers on certain machines or will not work properly when using HTTP Basic authentication. I've tired of trying to get this to work properly and am considering switching to another (hopefully) less buggy uploader. I've looked into Uploadify and it so far seems promising. Have you experience with any alternatives to jqUploader including possibly Uploadify? If so, what are your thoughts and recommendations?I would prefer that configuring any such uploader require knowledge of JavaScript and/or jQuery, and that it not be totally reliant on any one specific back-end technology. Built-in PHP compatibility is a plus.
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Feb 3, 2010
Can we run command prompt commands (like copy, rename etc) from an AIR or flex application?I thought of creating a bat file and running it using fscommand, but that does`nt serve my purpose.
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Aug 19, 2010
I would like to execute a CMD command from my flex application programmatically. Something like
> mediaplayer.exe "mySong.mp3"
I also tried using fscommand but was not successful. While googling I learnt that its not supported by AIR. I would like to know if there is any other alternative for executing the commands.
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Aug 11, 2010
I needed some guidance on how to use FlexUnit 4 within Flash Builder,to unit test a Parsley-frameworked Flex application.I have tried lookign at one or two sites but with no avail.
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Apr 25, 2007
I've been reading up on the Cairngorm architecture that Adobe recommends as best practice for devevloping RIA's in Flex.http:[url].....I recently purchased Flash CS3 and want to find a way to implement Cairngorm in my upcomming RIAs that will be built in Flash instead of Flex. I've created my own version of Cairngorm that uses almost all of the features and classes described in the Cairngorm architecture.
The biggest challenge for developing a Cairngorm architecture in Flash is that the architecturerelies heavily on Flex data binding to update the view when there are changes in the model. As far as I can find, there are no such capabilities built into AS3. This leaves me with a few not-so-desirable options.I could write my own data binding classes, or try to migrate the data binding classes from Flex.
each view class that can respond to changes in the model implements an "IBinded" interface that contains one function called modelUpdated. These classes register with a 'bind list' when they are instantiated, and any command that causes a change in the model also calls a function cycles through each registered view class, calling the 'modelUpdated' function to signify that the model has updated.This is a reasonable solution for a very simple application with very little model data, but as the application increases in complexity, it does not scale, because there is no way for a view class that is binded to an object in the model to know whether or not that object has changed - instead, EVERY view class that responds to changes in the model must check the current value of whatever objects they bind to and see if there has been an update.
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Oct 18, 2010
[URL] Looks like MVC to me,but I'm not sure if that's the exact framework used. UPDATE Now I know it's using the Cairngorm framework,and I've downloaded all the source files,how can I generate a .swf file? UPDATE 2 How can I know the exact version of Cairngorm used?
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