001/*
002 * Copyright (C) 2007 The Guava Authors
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package com.google.common.base;
018
019/**
020 * Implemented by references that have code to run after garbage collection of their referents.
021 *
022 * @see FinalizableReferenceQueue
023 * @author Bob Lee
024 * @since 2.0
025 */
026public interface FinalizableReference {
027  /**
028   * Invoked on a background thread after the referent has been garbage collected unless security
029   * restrictions prevented starting a background thread, in which case this method is invoked when
030   * new references are created.
031   */
032  void finalizeReferent();
033}