code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.datasketches.memory.internal;
  
  import jdk.internal.ref.Cleaner;
  
  /**
   * Extracts a version-dependent reference to the `jdk.internal.ref.Cleaner` into
   * a standalone class. The package name for Cleaner has changed in
   * later versions. The appropriate class will be loaded by the class loader
   * depending on the Java version that is used.
   * For more information, see: https://openjdk.java.net/jeps/238
   */
  //@SuppressWarnings("restriction")
  public class MemoryCleaner {
    private final Cleaner cleaner;
  
    /**
     * Creates a new `jdk.internal.ref.Cleaner`.
     * @param referent the object to be cleaned
     * @param deallocator - the cleanup code to be run when the cleaner is invoked.
     * return MemoryCleaner
     */
    public MemoryCleaner(final Object referent, final Runnable deallocator) {
      cleaner = Cleaner.create(referent, deallocator);
    }
  
    /**
     * Runs this cleaner, if it has not been run before.
     */
    public void clean() {
      cleaner.clean();
    }
  }
  