mirror of https://github.com/sbt/sbt.git
27 lines
793 B
Scala
27 lines
793 B
Scala
package xsbt
|
|
|
|
import java.lang.ref.WeakReference
|
|
import java.lang.reflect.Method
|
|
import scala.reflect.Manifest
|
|
|
|
// replacement for structural type cache, which doesn't use weak references
|
|
// assumes type of target doesn't change
|
|
// not thread safe
|
|
private final class CachedMethod[T](name: String, tpes: Class[_]*)(mf: Manifest[T]) extends NotNull
|
|
{
|
|
private var method = new WeakReference[Method](null)
|
|
private def getMethod(on: AnyRef): Method =
|
|
{
|
|
val m = on.getClass.getMethod(name, tpes : _*)
|
|
method = new WeakReference(m)
|
|
m
|
|
}
|
|
def force(on: AnyRef) { getMethod(on) }
|
|
def apply(on: AnyRef, args: AnyRef*): T =
|
|
{
|
|
val cached = method.get
|
|
val m = if(cached ne null) cached else getMethod(on)
|
|
val result = m.invoke(on, args : _*)
|
|
mf.erasure.cast(result).asInstanceOf[T]
|
|
}
|
|
} |