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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2002-2013, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id: RemoteGC.scala 17547 2009-04-21 13:56:28Z michelou $
package scala.runtime.remoting
import java.lang.ref.{Reference, WeakReference, ReferenceQueue}
import java.rmi.{NoSuchObjectException, Remote}
import java.rmi.server.UnicastRemoteObject
import scala.collection.mutable
/**
*
* @author Stephane Micheloud
* @version 1.0
*/
// Adapted from scala.actors.ActorGC
private [runtime] class RemoteGC {
private val refQueue = new ReferenceQueue[Remote]
private val refSet = new mutable.HashSet[Reference[T] forSome { type T <: Remote }]
private var liveRefs = 0
def newRef(a: Remote) = synchronized {
refSet += new WeakReference(a, refQueue)
liveRefs += 1
info("added object reference \""+a+"\" ("+liveRefs+")")
}
def gc() = synchronized {
info("GC called ("+liveRefs+")")
// check for unreachable object references
def drain() {
val wr = refQueue.poll
if (wr != null) {
val msg = try {
UnicastRemoteObject.unexportObject(wr.get, true/*force*/)
"removed object reference"
}
catch {
case e: NoSuchObjectException =>
"object already unbound"
}
info(msg+" ("+liveRefs+")")
liveRefs -= 1
refSet -= wr
// continue draining
drain()
}
}
drain()
}
def allClosed: Boolean = synchronized {
liveRefs <= 0
}
private def info(msg: String) { Debug.info("[RemoteGC] "+msg) }
}
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