LinkedQueueNode.java

/**
 * Copyright 2016 Netflix, Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
 * the License for the specific language governing permissions and limitations under the License.
 */

/*
 * The code was inspired by the similarly named JCTools class: 
 * https://github.com/JCTools/JCTools/blob/master/jctools-core/src/main/java/org/jctools/queues/atomic
 */

package io.reactivex.internal.queue;

import java.util.concurrent.atomic.AtomicReference;

public final class LinkedQueueNode<E> extends AtomicReference<LinkedQueueNode<E>> {
    /** */
    private static final long serialVersionUID = 2404266111789071508L;
    private E value;
    LinkedQueueNode() {
    }
    LinkedQueueNode(E val) {
        spValue(val);
    }
    /**
     * Gets the current value and nulls out the reference to it from this node.
     * 
     * @return value
     */
    public E getAndNullValue() {
        E temp = lpValue();
        spValue(null);
        return temp;
    }

    public E lpValue() {
        return value;
    }

    public void spValue(E newValue) {
        value = newValue;
    }

    public void soNext(LinkedQueueNode<E> n) {
        lazySet(n);
    }

    public LinkedQueueNode<E> lvNext() {
        return get();
    }
}