1090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Copyright (C) 2007 The Guava Authors 3090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 4090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Licensed under the Apache License, Version 2.0 (the "License"); 5090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * you may not use this file except in compliance with the License. 6090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * You may obtain a copy of the License at 7090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 8090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * http://www.apache.org/licenses/LICENSE-2.0 9090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 10090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Unless required by applicable law or agreed to in writing, software 11090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * distributed under the License is distributed on an "AS IS" BASIS, 12090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * See the License for the specific language governing permissions and 14090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * limitations under the License. 15090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 16090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 17090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonpackage com.google.common.base; 18090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 19090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilsonimport java.lang.ref.PhantomReference; 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport java.lang.ref.ReferenceQueue; 21090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson 22090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson/** 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Phantom reference with a {@code finalizeReferent()} method which a background thread invokes 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * after the garbage collector reclaims the referent. This is a simpler alternative to using a 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * {@link ReferenceQueue}. 26090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * <p>Unlike a normal phantom reference, this reference will be cleared automatically. 28090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 29090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * @author Bob Lee 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * @since 2.0 (imported from Google Collections Library) 31090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpublic abstract class FinalizablePhantomReference<T> extends PhantomReference<T> 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert implements FinalizableReference { 34090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson /** 35090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * Constructs a new finalizable phantom reference. 36090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * 37090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * @param referent to phantom reference 38090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson * @param queue that should finalize the referent 39090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson */ 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert protected FinalizablePhantomReference(T referent, FinalizableReferenceQueue queue) { 41090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson super(referent, queue.queue); 42090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson queue.cleanUp(); 43090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson } 44090f9b4c879985bc747c214f82c62471e60c7742Jesse Wilson} 45