[functor] is not a package I'm really involved in, but..... AFAIN, no one is using them in the rest of Jakarta. They probably could, similarly they probably could be used for event mechanisms. I just don't know of any cases.
There was some talk a while back of using functors for reflection (predicates to match the right methods). [clazz] may have this, but I don't think it does. So, anything you do is probably new ground. I'm sure the list would welcome feedback on what you find. Stephen ----- Original Message ----- From: "Matt Munz" <[EMAIL PROTECTED]> Stephen, Thanks. I think that the usefulness of functors re: collections is clear to me. I'm really interested in other applications, such as event mechanisms, and in reflection-based invocation (and interception). Do you know of anyone using functors for these purposes? For instance, are the server folks at apache using them? Also, do you know of any other forums for discussing functors in java? - Matt -----Original Message----- From: Stephen Colebourne [mailto:[EMAIL PROTECTED] Sent: Mon 9/22/2003 4:52 PM To: Jakarta Commons Developers List Cc: Subject: Re: [functor] Uses for Functors [functors] grew partially from the four functors in [collections], Predicate, Closure, Factory and Transformer. (Although you can argue whether these are true functors...) Thus you could look at [collections] to see how these classes are used there. Stephen ----- Original Message ----- From: "Matt Munz" <[EMAIL PROTECTED]> After reading "Blocks in Java", I'm pretty sure that Functors/closures are useful in certain instances. I'm unfamiliar with the topic, however, and would like to gain a sense of in what scenarios they are best used. In the use of collections / iterators, and in the serialization of algorithms (command pattern), the applicaton of Functors seems clear to me. Are there other common application areas? For example, what about event mechanisms? Some languages use method pointers for this purpose. Is there any sense in using Functors as event listeners? I'm considering making a sort of universal adapter that would adapt a given functor to any of the event listener interfaces. Does this make sense? Has anyone tried using (java) Functors in an event-based system (GUI)? Additionally, what about combining Functors with reflection? To invoke a method using reflection, one needs the object to act on and the name of the method to invoke. This state can be stored in a proxy object, but perhaps a Functor / closure is a good choice for this? Doing so would allow any object to be adapted to a (set of) Functor(s) at Runtime. Similarly, interception, logging, etc., could be provided by a chain of Functors. I hope my questions aren't too newbieish ;) Thanks for creating an interesting project. BTW, I origionally sent this message to commons-user, but got no response. - Matt Munz [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] ---------------------------------------------------------------------------- ---- > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
