Comments on: Singleton Factory

By: sascha/hdrs

sascha/hdrs — Sat, 11 Aug 2007 06:30:43 +0000

Yes it works now! Thanks a lot!

By: richard

richard — Wed, 08 Aug 2007 11:35:12 +0000

Sascha. That should work. Did you remember to set the function access to public – as with classes it will default to internal.

By: sascha/hdrs

sascha/hdrs — Wed, 08 Aug 2007 09:19:06 +0000

Great stuff but isn’t it possible to have the package function in a different package than the top-level? Say I want to keep a file named SingletonFactory.as that holds the function and is in the com.foo.app.patterns package? Seems not to work like that here, at least I get an error that the function/package is not found.

By: richard

richard — Fri, 27 Jul 2007 13:55:15 +0000

Keith: The code has some similarities with a flyweight factory because both are factories for creating and tracking objects, but the details and uses are very different.

Benny: I hadn’t thought of using a Dictionary – I’m still not familiar with all the classes in AS3. It works well and gives more stable lookup times. I’ve added your suggestion to the end of the post. Thanks.

By: matt poole

matt poole — Fri, 27 Jul 2007 13:44:58 +0000

Benny,

Thats just what I was going suggest , Im glad I read on a bit…

By: Benny

Benny — Fri, 27 Jul 2007 13:16:35 +0000

I find this an interessting idea and maybe the following code (not tested) could provide the unique identifier and direct lookup you would like?

package { function Singleton(c:Class):* { return c in instncs?instncs[c]:instncs[c]=new c(); } } var instncs:Dictionary=new Dictionary(true);

By: Keith Peters

Keith Peters — Fri, 27 Jul 2007 12:54:22 +0000

Actually what you wrote is pretty similar to the flyweight implementation.