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XWork is an command-pattern framework that is used to power WebWork as well as other applications. XWork provides an Inversion of Control container, a powerful expression language, data type conversion, validation, and pluggable configuration.

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/**
 * Copyright (C) 2006 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.opensymphony.xwork2.inject.util;

import java.lang.ref.PhantomReference;

/**
 * Phantom reference with a {@link com.opensymphony.xwork2.inject.util.FinalizableReference#finalizeReferent() 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}.
 *
 * @author [email protected] (Bob Lee)
 */
public abstract class FinalizablePhantomReference
    extends PhantomReference implements FinalizableReference {

  protected FinalizablePhantomReference(T referent) {
    super(referent, FinalizableReferenceQueue.getInstance());
  }
}