1 /** 2 * Copyright (C) 2006 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.inject.util; 18 19 import java.lang.ref.WeakReference; 20 21 /** 22 * Weak reference with a {@link FinalizableReference#finalizeReferent()} method 23 * which a background thread invokes after the garbage collector reclaims the 24 * referent. This is a simpler alternative to using a 25 * {@link java.lang.ref.ReferenceQueue}. 26 * 27 * @author crazybob@google.com (Bob Lee) 28 */ 29 public abstract class FinalizableWeakReference<T> extends WeakReference<T> 30 implements FinalizableReference { 31 32 protected FinalizableWeakReference(T referent) { 33 super(referent, FinalizableReferenceQueue.getInstance()); 34 } 35 } 36