I got bored last night and decided I would try to come up with a way to have an "Implements" keyword in ColdFusion.

The download contains four files

1. implements.cfm - If you want to use the custom tag version, copy this to your CustomTags directory.
2. implements.cfc
3. iComponentCache.cfc - a sample interface
4. ComponentCache.cfc - a sample class using the "Implements" keyword.

Useage:
For the Custom Tag, at the very top of your CFC put a

 It will throw an error if the class does not implement all the methods in the interfaces provided.
Example:


For the implements.cfc, You can use the object's init method to check the interface for an object anywhere.  To force a cfc to implement something, use

Example:

If you want to make sure an instance passed to a function uses a certain interface, replace "this" with "arguments.whatevertheinstancevariableis".
Example:


There are a couple other things.

1. To set the custom tag to "production" mode.  put <cf_implements mode="production" /> in your application.cfc/.cfm
2. To set the implements.cfc to "production" mode, you must pass the argument "mode" with the value of "production" to the init method.
3. You can also pass in your own CacheManager to the implements.cfc, the passed in CacheManager must implement iComponentManager.

I havent tested this in a production environment, and hardly tested in a testing environment... but would like some feedback before I try to improve this.

Can download it here

Enjoy