xref: /external/guava/src/com/google/common/base/FinalizablePhantomReference.java

/*
 * Copyright (C) 2007 Google 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.
 */

package com.google.common.base;

import java.lang.ref.PhantomReference;

/**
 * Phantom reference with a {@code finalizeReferent()} method which a
 * background thread invokes after the garbage collector reclaims the
 * referent. This is a simpler alternative to using a {@link
 * java.lang.ref.ReferenceQueue}.
 *
 * <p>Unlike a normal phantom reference, this reference will be cleared
 * automatically.
 *
 * @author Bob Lee
 * @since 2010.01.04 <b>stable</b> (imported from Google Collections Library)
 */
public abstract class FinalizablePhantomReference<T>
    extends PhantomReference<T> implements FinalizableReference {

  /**
   * Constructs a new finalizable phantom reference.
   *
   * @param referent to phantom reference
   * @param queue that should finalize the referent
   */
  protected FinalizablePhantomReference(T referent,
      FinalizableReferenceQueue queue) {
    super(referent, queue.queue);
    queue.cleanUp();
  }
}