public void finalizeReferent() {}
  }

  private WeakReference<ClassLoader> useFrqInSeparateLoader() throws Exception {
    ClassLoader myLoader = getClass().getClassLoader();
    URLClassLoader sepLoader = new URLClassLoader(getClassPathUrls(), myLoader.getParent());
    // sepLoader is the loader that we will use to load the parallel FinalizableReferenceQueue (FRQ)

    public void finalizeReferent() {}
  }

  private WeakReference<ClassLoader> useFrqInSeparateLoader() throws Exception {
    ClassLoader myLoader = getClass().getClassLoader();
    URLClassLoader sepLoader = new URLClassLoader(getClassPathUrls(), myLoader.getParent());
    // sepLoader is the loader that we will use to load the parallel FinalizableReferenceQueue (FRQ)

    assertThat(loader.getLoadCount()).isEqualTo(expectedLoads);
    assertThat(loader.getReloadCount()).isEqualTo(expectedReloads);

    ticker.advance(1, MILLISECONDS);
    assertThat(cache.getUnchecked(0)).isEqualTo(1);
    assertThat(cache.getUnchecked(1)).isEqualTo(-1);
    assertThat(cache.getUnchecked(2)).isEqualTo(3);
    assertThat(loader.getLoadCount()).isEqualTo(expectedLoads);

  public static <K, V> CacheLoader<K, V> asyncReloading(
      CacheLoader<K, V> loader, Executor executor) {
    checkNotNull(loader);
    checkNotNull(executor);
    return new CacheLoader<K, V>() {
      @Override
      public V load(K key) throws Exception {
        return loader.load(key);
      }

      @Override
      public ListenableFuture<V> reload(K key, V oldValue) {

    public static CoreExtensionEntry discoverFrom(ClassRealm loader) {
        Set<String> artifacts = new LinkedHashSet<>();
        Set<String> packages = new LinkedHashSet<>();

        try {
            Enumeration<URL> urls = loader.getResources(BUILDER.getExtensionDescriptorLocation());
            while (urls.hasMoreElements()) {

    }

    /**
     * Returns the class loader.
     * <p>
     * The class loader is searched in the following order:
     * </p>
     * <ol>
     * <li>If the context class loader is set for the calling thread, that context class loader</li>
     * <li>If the class loader that loaded the target class can be obtained, that class loader</li>
     * <li>If the class loader that loaded this class can be obtained, that class loader</li>

 *
 * <p>This class can't depend on other Guava code. If we were to load this class in the same class
 * loader as the rest of Guava, this thread would keep an indirect strong reference to the class
 * loader and prevent it from being garbage collected. This poses a problem for environments where
 * you want to throw away the class loader. For example, dynamically reloading a web application or
 * unloading an OSGi bundle.
 *

   * {@link CacheLoader#load} calls to {@code loader}.
   */
  static <K, V> CacheLoader<K, V> bulkLoader(CacheLoader<K, V> loader) {
    checkNotNull(loader);
    return new CacheLoader<K, V>() {
      @Override
      public V load(K key) throws Exception {
        return loader.load(key);
      }

      @Override

     *
     * @param classLoader the class loader (must not be {@literal null})
     * @return an {@link Iterable} wrapping a {@link ClassLoaderIterator}
     */
    public static Iterable<ClassLoader> iterable(final ClassLoader classLoader) {
        return () -> new ClassLoaderIterator(classLoader);
    }

    /**
     * Constructs an instance.
     *
     * @param classLoader the class loader (must not be {@literal null})
     */

   *       CacheLoader#loadAll bulk loading implementations}
   * </ul>
   *
   * <p><b>Warning:</b> For any given key, every {@code loader} used with it should compute the same
   * value. Otherwise, a call that passes one {@code loader} may return the result of another call
   * with a differently behaving {@code loader}. For example, a call that requests a short timeout
   * for an RPC may wait for a similar call that requests a long timeout, or a call by an