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The official Couchbase JVM Core IO Library
/*
* Copyright (c) 2023 Couchbase, Inc.
*
* 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.couchbase.client.core.util;
import com.couchbase.client.core.annotation.Stability;
import com.couchbase.client.core.env.CouchbaseThreadFactory;
import java.lang.ref.PhantomReference;
import java.lang.ref.ReferenceQueue;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import static java.util.Collections.newSetFromMap;
import static java.util.Objects.requireNonNull;
/**
* Approximates Java 9's
* java.lang.ref.Cleaner
*
*/
@Stability.Internal
public class Jdk8Cleaner {
private static final ThreadFactory cleanerThreadFactory = new CouchbaseThreadFactory("cb-cleaner-");
private final ReferenceQueue