com.google.common.base.FinalizableSoftReference Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
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/*
* 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 com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import javax.annotation.CheckForNull;
/**
* 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
*/
@J2ktIncompatible
@GwtIncompatible
@ElementTypesAreNonnullByDefault
public abstract class FinalizableSoftReference extends SoftReference
implements FinalizableReference {
/**
* Constructs a new finalizable soft reference.
*
* @param referent to softly reference
* @param queue that should finalize the referent
*/
protected FinalizableSoftReference(@CheckForNull T referent, FinalizableReferenceQueue queue) {
super(referent, queue.queue);
queue.cleanUp();
}
}