code: protected synchronized void notifyListenersSpiderProgress(int percentageComplete, int numberCrawled,
  			int numberToCrawl) {
  		for (SpiderListener l : listeners) {
  			l.spiderProgress(percentageComplete, numberCrawled, numberToCrawl);
  		}
  	}
docs: Notifies all the listeners regarding the spider progress.
  
  @param percentageComplete the percentage complete
  @param numberCrawled the number of pages crawled
  @param numberToCrawl the number of pages left to crawl