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Using multiple Interfaces for services

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patricklemiuex

19 Jun, 2011 07:14 PM

HI.
Love robotlegs! K. I am trying to use multiple services with interfaces for my application, for instance, I have an AMF remoting service and a JSON service. Say for instance, whichever service I need is a property in a proxy. What's the cleanest way to map my service "on demand" so I can use multiple services if necessary?

Can you provide a simple example please.

Thanks,
Patrick

1. Support Staff 2 Posted by Stray on 19 Jun, 2011 07:30 PM

   

   Hi Patrick,

   just checking - do you mean you want to switch the JSON / AMF / whatever service at runtime?

   Stray

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2. 3 Posted by patricklemiuex on 19 Jun, 2011 07:40 PM

   

   Stray,

   Yes that's correct at runtime, depending which option is selected - i
   have advanced settings.

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3. 4 Posted by ZackPierce on 23 Jun, 2011 05:19 AM

   

   Because re-injection into objects isn't currently supported in Robotlegs/SwiftSuspenders 1.X, it's less than straightforward to attempt to solve this by injection-mapping-switching on the fly, especially if any persistent (read non-Command) objects have lingering references to your service interface (I'm looking meaningfully in the direction of the mediators).

   So, one solution is to use a strategy pattern. Make an implementation of your service interface that delegates all of the real work to an implementation property. Then, use commands to swap your different AMF / JSON variant objects into that property on demand.

   interface IServiceExample {
   
       function doSomething():void;
   
   }
   
   class WrapperServiceExample implements IServiceExample {
   
       public var implementation:IServiceExample;
   
       public function doSomething():void {
           implementation.doSomething();
       }
   }
   
   // in the context
   injector.mapSingleton(AMFServiceExample);
   injector.mapSingleton(JSONServiceExample);
   injector.mapSingleton(WrapperServiceExample);
   var wrapper:WrapperServiceExample = injector.getInstance(WrapperServiceExample);
   injector.mapValue(IServiceExample, wrapper);
   
   
   class SwapToUsingAMFService extends Command {
   
       [Inject]
       public var wrapper:WrapperServiceExample;
   
       [Inject]
       public var amfService:AMFServiceExample;
   
       override public function execute():void {
           wrapper.implementation = amfService;
       }
   }
   

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4. Ondina D.F. closed this discussion on 02 Nov, 2011 05:22 PM.

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