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How do I preload data from a async service

• Edit

corey

13 Jan, 2012 07:35 AM

I would like to preload some data from an external source that is required before any of the views can be created and start requesting data of the their own.

Do I create a manual injection within the startup function?

Is there another function I can override within the context class?

1. 1 Posted by Nangra on 13 Jan, 2012 09:27 AM

   

   Maby execute command that will preload data from Context startup method?

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2. Support Staff 2 Posted by creynders on 13 Jan, 2012 12:49 PM

   

   Here's an example of bootstrapping an application with several async service calls before anything else happens:
   https://github.com/creynders/robotlegs-demo-bootstrap

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3. Support Staff 3 Posted by Ondina D.F. on 13 Jan, 2012 01:02 PM

   

   @creynders Ha! I was just about to recommend your example :)

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4. 4 Posted by corey on 14 Jan, 2012 12:39 AM

   

   What if I am not using signals though? Would this approach still work?

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5. Support Staff 5 Posted by creynders on 14 Jan, 2012 08:38 AM

   

   Yes. It doesn't make a difference at all. You do need the macrobot extension though. Obviously there are other ways as well, by using a state machine for instance:
   https://github.com/joelhooks/robotlegs-utilities-StateMachine

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6. 6 Posted by corey on 14 Jan, 2012 09:41 PM

   

   Ok, I was able to get something working based off the demo-bootstrap above without using signals.

   Here is some code snippets for other people to reference. If I am not following best practices please point them out.

   Essentially what I did was listen for the STARTUP Event that I manually dispatched and then robotlegs called the Command that was mapped.
   Inside this command I dispatch another command that calls an async service to retrieve the data. Once the data is retrieved I then map all the mediators using the detain/release methods.

   More about the STARTUP EVENTS can be found in the following thread

   override public function startup():void
           {
               
               // This allows me to preload some data from an esync service
               commandMap.mapEvent(ContextEvent.STARTUP, ApplicationStartupCommand);
               this.dispatchEvent(new ContextEvent(ContextEvent.STARTUP));
               
               
               // Startup complete
               super.startup();
               
           }
   

   Snippet form Command

   public class ApplicationStartupCommand extends Command
       {
           public function ApplicationStartupCommand()
           {
               super();
           }
           override public function execute():void{
               new BootstrapCommands(commandMap);
               new BootstrapModels(injector);
               this.eventDispatcher.addEventListener(ProfilesEvent.PROFILESRESULT, onSettingsHandler);
               dispatch(new SettingsServiceEvent(SettingsServiceEvent.READ_REQUEST, "profiles"));
               commandMap.detain(this);
           }
           private function onSettingsHandler(event:ProfilesEvent):void{
               //settings have been read from the disk
               new BootstrapViewMediators(mediatorMap);
               commandMap.release(this);
   
   
           }
       }
   

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7. corey closed this discussion on 14 Feb, 2012 06:46 AM.