/*
* Copyright (C) 2007 The Guava Authors
*
* 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.google.common.base;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
/**
* Soft reference with a {@code finalizeReferent()} method which a background thread invokes after
* the garbage collector reclaims the referent. This is a simpler alternative to using a {@link
* ReferenceQueue}.
*
* @author Bob Lee
* @since 2.0 (imported from Google Collections Library)
*/
public
abstract class FinalizableSoftReference<T> extends SoftReference<T>
implements FinalizableReference {
/**
* Constructs a new finalizable soft reference.
*
* @param referent to softly reference
* @param queue that should finalize the referent
* @deprecated FinalizableReferenceQueue is an unsound mechanism for cleaning up references,
* because (1) it's single thread can be easily overloaded, and (2) it's insistance on running
* a background thread is problematic in certain environments. <b>This class is scheduled for
* deletion in December 2012.</b>
*/
@Deprecated
protected FinalizableSoftReference(T referent, FinalizableReferenceQueue queue) {
super(referent, queue.queue);
queue.cleanUp();
}
}
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