class CloseableByteBuffer implements Closeable {
    private ByteBuffer byteBuffer;
    private Runnable onClose;

    /**
     * A wrapper for {@link ByteBuffer} that implements the {@link Closeable} interface, releasing the
     * {@link ByteBuffer} when it is no longer needed.
     * 
     * @param byteBuffer
     *            The {@link ByteBuffer} to wrap
     * @param onClose
     *            The method to run when {@link #close()} is called.
     */
    CloseableByteBuffer(final ByteBuffer byteBuffer, final Runnable onClose) {
        this.byteBuffer = byteBuffer;
        this.onClose = onClose;
    }

    /**
     * @return The wrapped {@link ByteBuffer}.
     */
    public ByteBuffer getByteBuffer() {
        return byteBuffer;
    }

    /** Release the wrapped {@link ByteBuffer}. */
    @Override
    public void close() throws IOException {<FILL_FUNCTION_BODY>}
}

        if (onClose != null) {
            try {
                onClose.run();
            } catch (final Exception e) {
                // Ignore
            }
            onClose = null;
        }
        byteBuffer = null;
    
<no_super_class>