private static final class CloseableList extends IdentityHashMap<AutoCloseable, Executor>
      implements Closeable {
    private final DeferredCloser closer = new DeferredCloser(this);
    private volatile boolean closed;
    private volatile @Nullable CountDownLatch whenClosed;

    <V extends @Nullable Object, U extends @Nullable Object>
        ListenableFuture<U> applyClosingFunction(

  private static final class CloseableList extends IdentityHashMap<AutoCloseable, Executor>
      implements Closeable {
    private final DeferredCloser closer = new DeferredCloser(this);
    private volatile boolean closed;
    private volatile @Nullable CountDownLatch whenClosed;

    <V extends @Nullable Object, U extends @Nullable Object>
        ListenableFuture<U> applyClosingFunction(

    }
            ]]>
          </code>
        </codeSegment>
        <codeSegment>
          <version>4.1.0+</version>
          <code>
            <![CDATA[
    volatile Map<String, Plugin> pluginMap;

    /**
     * @return a Map of plugins field with {@code Plugins#getKey()} as key
     * @see Plugin#getKey()
     */
    public Map<String, Plugin> getPluginsAsMap() {