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Core functionality for the RSocket library

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/*
 * 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.
 */
package io.rsocket.internal.jctools.queues;

import static io.rsocket.internal.jctools.queues.UnsafeAccess.UNSAFE;
import static io.rsocket.internal.jctools.queues.UnsafeAccess.fieldOffset;

final class LinkedQueueNode {
  private static final long NEXT_OFFSET = fieldOffset(LinkedQueueNode.class, "next");

  private E value;
  private volatile LinkedQueueNode next;

  LinkedQueueNode() {
    this(null);
  }

  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 n) {
    UNSAFE.putOrderedObject(this, NEXT_OFFSET, n);
  }

  public void spNext(LinkedQueueNode n) {
    UNSAFE.putObject(this, NEXT_OFFSET, n);
  }

  public LinkedQueueNode lvNext() {
    return next;
  }
}