/*
* This file is part of the Jikes RVM project (http://jikesrvm.org).
*
* This file is licensed to You under the Common Public License (CPL);
* You may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.opensource.org/licenses/cpl1.0.php
*
* See the COPYRIGHT.txt file distributed with this work for information
* regarding copyright ownership.
*/
package org.mmtk.vm;
import org.mmtk.plan.TraceLocal;
import org.vmmagic.pragma.Uninterruptible;
/**
* This class manages SoftReferences, WeakReferences, and
* PhantomReferences.
*/
@Uninterruptible
public abstract class ReferenceProcessor {
public enum Semantics { SOFT, WEAK, PHANTOM }
/**
* Scan through the list of references.
*
* @param trace the thread local trace element.
* @param nursery true if it is safe to only scan new references.
*/
public abstract void scan(TraceLocal trace, boolean nursery);
/**
* Iterate over all references and forward.
*/
public abstract void forward(TraceLocal trace, boolean nursery);
/**
* Return the number of references objects on the queue
*
* @return
*/
public abstract int countWaitingReferences();
}