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AS3: My favorite example of Singleton

/ Published in: ActionScript 3
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There are a variety of ways to create a Singleton in AS3 but because Adobe wants to be ECMA compliant, there's no way to do it (like in Java) using a private constructor. Writing a singleton this way will give you a runtime warning if something goes wrong.

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  1. package
  2. {
  3. 	public class Singleton
  4. 	{
  5. 		private static var _instance:Singleton;
  6. 		private static var _okToCreate:Boolean = false;
  7.  
  8. 		public function Singleton()
  9. 		{
  10. 			if( !_okToCreate ){
  11. 				throw new Error("Error: " + this + 
  12. 					" is not a singleton and must be " + 
  13. 					"accessed with the getInstance() method");				
  14. 			}
  15. 		}
  16.  
  17. 		public static function getInstance():Singleton
  18. 		{
  19. 			if( !Singleton._instance ){
  20. 				_okToCreate = true;
  21. 				_instance = new Singleton();
  22. 				_okToCreate = false;
  23. 			}
  24. 			return _instance;
  25. 		}
  26. 	}
  27. }

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