static final Logger logger = LogManager.getLogger(GenerateThumbnailJob.class);

    protected int numOfThreads = 1;

    protected boolean cleanup = false;

    public GenerateThumbnailJob numOfThreads(final int numOfThreads) {
        this.numOfThreads = numOfThreads;
        return this;
    }

    public GenerateThumbnailJob cleanup() {
        cleanup = true;
        return this;
    }

    public static final String CRAWLING_INFO_ID = "crawlingInfoId";

    public static final String INDEXING_TARGET = "indexingTarget";

    public static final String NUM_OF_THREADS = "numOfThreads";

    public static final String BASIC = "BASIC";

    public static final String DIGEST = "DIGEST";

    public static final String NTLM = "NTLM";

    public static final String FORM = "FORM";