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problem with mediator and service.

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Seungtack Baek

24 Jun, 2010 08:58 PM

Hello, I am trying to build a simple app that consists of a button (in fl.controls package, I imported those by exporting swc in CS5) and a list (in fl.controls package, same senario).

There are two problems with my app: 1. The button gets mediated (consol outputs "button mediated"), but list does not. 2. Also, in AccessDataCommand.as, the instance of AccessDataService, service, which I injected, is causing Error #1009, being null.

The attached files are my source files.

• RSSInfo.as 279 Bytes
• RSSContext.as 1.05 KB
• ApplicationMediator.as 674 Bytes
• ButtonView.as 189 Bytes
• ButtonViewMediator.as 581 Bytes
• ListView.as 210 Bytes
• ListViewMediator.as 474 Bytes
• IAccessDataService.as 173 Bytes
• AccessDataService.as 1.22 KB
• AccessDataEvent.as 358 Bytes
• AccessDataCommand.as 335 Bytes

1. Support Staff 1 Posted by Shaun Smith on 24 Jun, 2010 09:21 PM

   

   Try changing the order of things in your context startup:

   override public function startup():void
   {
       commandMap.mapEvent(AccessDataEvent.DATA_REQUESTED, AccessDataCommand, AccessDataEvent);
       
       injector.mapSingletonOf(IAccessDataService, AccessDataService);
   
       mediatorMap.mapView(ButtonView, ButtonViewMediator);
       mediatorMap.mapView(ListView, ListViewMediator);
       mediatorMap.mapView(RSSInfo, ApplicationMediator);
       
       super.startup();    
   }
   

   Notice that the ApplicationMediator mapping happens right at the end.

   When you map a mediator to the contextView that mediator gets created immediately, so this line:

   mediatorMap.mapView(RSSInfo, ApplicationMediator);

   was causing an instance of ApplicationMediator to be created immediately - which, in your case, was too soon (before the ListViewMediator and IAccessDataService were mapped).

   Hope that helps!

   • Edit

2. 2 Posted by Seungtack Baek on 25 Jun, 2010 04:04 PM

   

   THANKS A LOT! that fixed the ListView Issue.

   However, it keeps saying that "service" in the AccessDataCommand.as is null.

   How so?

   • Edit

3. Support Staff 3 Posted by Shaun Smith on 25 Jun, 2010 05:29 PM

   

   Hi,

   You are trying to access the property in the AccessDataCommand's constructor - that is too soon, the property will not have been injected yet. You should move that code into the execute() method, like so:

   public class AccessDataCommand extends Command
   {
       [Inject]
       public var service:IAccessDataService;
       
       override public function execute():void
       {
           service.loadData();     
       }
   }
   

   • Edit

4. Stray closed this discussion on 16 Feb, 2011 09:05 PM.