Kris,
If your goal is to have some cleanup function added at the end of the
request, you can do the following:
trait Cleanable {def cleanup: Unit}
class MyStuff {
var needsCleanup: Can[Cleanable] = Empty
S.addCleanupFunc(() => needsCleanup.foreach(_.cleanup))
}
So, in the above code, if you assign some value to needsCleanup, it will be
cleaned up at the end of the request.
Does this help point you in the right direction?
Thanks,
David
On Mon, Sep 29, 2008 at 11:46 AM, Kris Nuttycombe <[EMAIL PROTECTED]
> wrote:
>
> I'm not opposed to that design, but I do think that it's a little
> unexpected that any declaration of a RequestVar essentially creates a
> singleton. This is probably once again something that could be solved
> with a bit better documentation. It's surprising to use a class in a
> pattern where one would ordinarily expect to create independent
> instances and to get singletons instead.
>
> What other mechanisms exist to bind to Lift's lifecycle hooks?
> RequestVar does essentially what I need it to do in my hack, but
> relying upon the internal implementation of AnyVar makes me a little
> queasy.
>
> Kris
>
> On Mon, Sep 29, 2008 at 12:14 PM, David Pollak
> <[EMAIL PROTECTED]> wrote:
> > Kris,
> >
> > You are correct that RequestVar and SessionVar reference the same
> underlying
> > data no matter what instances they are part of. There are a bunch of
> design
> > reasons for this. If you have a bunch of instance variables that have
> > different things that need cleaning up, I'd suggest not using RequestVar.
> >
> > Sorry,
> >
> > David
> >
> > On Sat, Sep 27, 2008 at 11:34 AM, Kris Nuttycombe
> > <[EMAIL PROTECTED]> wrote:
> >>
> >> For the record, here's my ugly-ass workaround, depending upon the fact
> >> that cleanupFunc is called to obtain the cleanup function at the same
> >> time that the default value is set.
> >>
> >> import javax.naming.InitialContext
> >> import net.liftweb.util.{Can,Full,Log}
> >> import net.liftweb.http.RequestVar
> >>
> >> object JNDIResource {
> >> val context = new InitialContext()
> >> }
> >>
> >> import JNDIResource._
> >>
> >> abstract class JNDIResource[T](val name: String) extends
> >> RequestVar[T](context.lookup(name).asInstanceOf[T]) {
> >>
> >> // This is way too dependent upon an implementation detail of the
> >> superclass.
> >> override def cleanupFunc : Can[() => Unit] = {
> >> Log.debug("Initializing JNDI resource " + name + "(" + this.is +
> ")")
> >> initialize(this.is) //this will result in a recursive call, but
> >> the the order of operations is such that it will take the other
> >> branch.
> >>
> >> Full(() => {
> >> Log.debug("Releasing JNDI resource " + name + "(" + this.is +
> ")")
> >> dispose(this.is)
> >> })
> >> }
> >>
> >> /**
> >> * Subclasses should override this method to provide initialization
> >> of the resource
> >> */
> >> protected def initialize(resource : T) {
> >> }
> >>
> >> /**
> >> * Subclasses should override this method to provide cleanup on the
> >> resource
> >> */
> >> protected def dispose(resource: T) {
> >> }
> >> }
> >>
> >>
> >
> >
> >
> > --
> > Lift, the simply functional web framework http://liftweb.net
> > Collaborative Task Management http://much4.us
> > Follow me: http://twitter.com/dpp
> > Git some: http://github.com/dpp
> >
> > >
> >
>
> >
>
--
Lift, the simply functional web framework http://liftweb.net
Collaborative Task Management http://much4.us
Follow me: http://twitter.com/dpp
Git some: http://github.com/dpp
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Lift" group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~----------~----~----~----~------~----~------~--~---
