}, "ThumbnailMigrator").start();
    }

    /**
     * Sets the thumbnail path cache size.
     *
     * @param thumbnailPathCacheSize the cache size to set
     */
    public void setThumbnailPathCacheSize(final int thumbnailPathCacheSize) {
        this.thumbnailPathCacheSize = thumbnailPathCacheSize;
    }

    /**
     * Sets the image file extension for thumbnails.
     *