}

    /**
     * Sets the maximum size of the thumbnail task queue.
     *
     * @param thumbnailTaskQueueSize the queue size to set
     */
    public void setThumbnailTaskQueueSize(final int thumbnailTaskQueueSize) {
        this.thumbnailTaskQueueSize = thumbnailTaskQueueSize;
    }

    /**
     * Sets the expiration time for no-image placeholder files.
     *