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    
017    package 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 (imported from Google Collections Library)
025     */
026    public
027    interface FinalizableReference {
028      /**
029       * Invoked on a background thread after the referent has been garbage collected unless security
030       * restrictions prevented starting a background thread, in which case this method is invoked when
031       * new references are created.
032       * @deprecated FinalizableReferenceQueue is an unsound mechanism for cleaning up references,
033       *     because (1) it's single thread can be easily overloaded, and (2) it's insistance on running
034       *     a background thread is problematic in certain environments. <b>This class is scheduled for
035       *     deletion in December 2012.</b>
036       */
037      @Deprecated
038      void finalizeReferent();
039    }