gistfile1.as

package com.destroytoday.example
{
	public class AccountController
	{
		[Inject]
		public var signalBus:SignalBus;
		
		[Inject]
		public var twitterService:TwitterService;
		
		[Inject]
		public var userModel:UserModel;
		
		public function AccountController()
		{
		}
		
		public function login(screenName:String, password:String):void
		{
			promise = twitterService.getAccessToken(screenName, password);
			
			promise.completed.add(getAccessTokenCompletedHandler);
			promise.failed.add(getAccessTokenFailedHandler);
		}
		
		protected function getAccessTokenCompletedHandler(promise:IPromise):void
		{
			userModel.accessToken = promise.result as XAuthToken;
		}
		
		protected function getAccessTokenFailedHandler(promise:IPromise):void
		{
			signalBus.loginFailed.dispatch(promise.error as String);
		}
	}
}

gistfile2.as

package com.destroytoday.example
{
	public class TwitterService
	{
		protected var promisePool:ObjectPool;
		
		protected var promiseMap:ObjectMap;
		
		public function TwitterService()
		{
			promisePool = new ObjectPool(Promise);
			promiseMap = new ObjectMap();
		}
		
		public function getAccessToken(screenName:String, password:String):IPromise
		{
			var loader:URLLoader = new URLLoader();
			var promise:IPromise = 
				promiseMap.mapValue(loader, promisePool.getObject());
			
			/* parse OAuth signature */
			/* set loader params */
			/* add loader listeners */
			
			loader.load(request);

			return promise;
		}
		
		protected function getAccessTokenCompletedHandler(event:Event):void
		{
			var promise:IPromise = promiseMap.unmapValue(event.currentTarget);
			
			promise.dispatchResult(event.data);
			
			promisePool.dispose(promise);
		}
		
		protected function getAccessTokenFailedHandler(event:IOErrorEvent):void
		{
			var promise:IPromise = promiseMap.unmapValue(event.currentTarget);
			
			promise.dispatchError(event.message);
			
			promisePool.dispose(promise);
		}
	}
}

gistfile3.as

package com.destroytoday.example
{
	public class TwitterService
	{
		protected var promisePool:ObjectPool;
		
		protected var promiseMap:ObjectMap;
		
		public function TwitterService()
		{
			promisePool = new ObjectPool(Promise);
			promiseMap = new ObjectMap();
		}
		
		public function getAccessToken(screenName:String, password:String):IPromise
		{
			var loader:URLLoader = new URLLoader();
			var promise:IPromise = 
				promiseMap.mapValue(loader, promisePool.getObject());
			
			promise.addResultProcessor(processGetAccessTokenResult);
			
			/* parse OAuth signature */
			/* set loader params */
			/* add loader listeners */
			
			loader.load(request);

			return promise;
		}
		
		/* insert other API methods here */
		
		protected function processGetAccessTokenResult(result:*):*
		{
			return TwitterParser.parseToken(result);
		}
		
		/* insert other API method result processors here */
		
		protected function completedHandler(event:Event):void
		{
			var promise:IPromise = promiseMap.unmapValue(event.currentTarget);
			
			promise.dispatchResult(event.data);
			
			promisePool.dispose(promise);
		}
		
		protected function failedHandler(event:IOErrorEvent):void
		{
			var promise:IPromise = promiseMap.unmapValue(event.currentTarget);
			
			promise.dispatchError(event.message);
			
			promisePool.dispose(promise);
		}
	}
}