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