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) {
}
}
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