Scala example source code file (MainNode.java)

This example Scala source code file (MainNode.java) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

atomicreferencefieldupdater, basicnode, cas_prev, collection, concurrent, deprecated, mainnode, parallel, read_prev, suppresswarnings, v, write_prev

The MainNode.java Scala example source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2013, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */

package scala.collection.concurrent;

import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;

abstract class MainNode<K, V> extends BasicNode {

    @SuppressWarnings("rawtypes")
    public static final AtomicReferenceFieldUpdater<MainNode, MainNode> updater =
            AtomicReferenceFieldUpdater.newUpdater(MainNode.class, MainNode.class, "prev");

    public volatile MainNode<K, V> prev = null;

    public abstract int cachedSize(Object ct);

    public boolean CAS_PREV(MainNode<K, V> oldval, MainNode<K, V> nval) {
	return updater.compareAndSet(this, oldval, nval);
    }

    public void WRITE_PREV(MainNode<K, V> nval) {
	updater.set(this, nval);
    }

    // do we need this? unclear in the javadocs...
    // apparently not - volatile reads are supposed to be safe
    // irregardless of whether there are concurrent ARFU updates
    @Deprecated @SuppressWarnings("unchecked")
    public MainNode<K, V> READ_PREV() {
	return updater.get(this);
    }

}