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Core module of Ruby on Truffle

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/*
 * Copyright (c) 2019, 2024 Oracle and/or its affiliates. All rights reserved. This
 * code is released under a tri EPL/GPL/LGPL license. You can use it,
 * redistribute it and/or modify it under the terms of the:
 *
 * Eclipse Public License version 2.0, or
 * GNU General Public License version 2, or
 * GNU Lesser General Public License version 2.1.
 */
package org.truffleruby.core;

import java.lang.ref.ReferenceQueue;
import java.util.Collection;
import java.util.Deque;
import java.util.LinkedList;
import java.util.Set;

import org.truffleruby.language.RubyDynamicObject;
import org.truffleruby.language.objects.ObjectGraphNode;

public class FinalizerReference
        extends
        ReferenceProcessingService.PhantomProcessingReference implements ObjectGraphNode {

    /** All accesses to this Deque must be synchronized by taking the {@link FinalizationService} monitor, to avoid
     * concurrent access. */
    private final Deque finalizers = new LinkedList<>();

    FinalizerReference(Object object, ReferenceQueue queue, FinalizationService service) {
        super(object, queue, service);
    }

    void addFinalizer(Class owner, Runnable action, RubyDynamicObject root) {
        finalizers.addLast(new FinalizationService.Finalizer(owner, action, root));
    }

    FinalizerReference removeFinalizers(FinalizationService finalizationService, Class owner) {
        finalizers.removeIf(f -> f.getOwner() == owner);

        if (finalizers.isEmpty()) {
            finalizationService.remove(this);
            return null;
        } else {
            return this;
        }
    }

    FinalizationService.Finalizer getFirstFinalizer() {
        return finalizers.pollFirst();
    }

    public void collectRoots(Collection