@Override
 public void run() {
   List<FBSource> sources = FBSourceManager.getSources();
   LOGGER.info(sources.toString());
   if (sources.size() == 0) {
     LOGGER.info("没有任务!");
   }
   for (FBSource source : sources) {
     LOGGER.info("开始任务 :" + source.getName());
     crawl(source);
     TimerUtils.delay();
     LOGGER.info("任务结束:" + source.getName());
   }
 }
 private void crawl(FBSource source) {
   if (!shouldCrawl(source)) {
     return;
   }
   String homeUrl = source.getHomepage();
   String html;
   try {
     html = request(homeUrl);
   } catch (Throwable e) {
     String errormsg =
         "\n 爬取" + source.getName() + "的facebook失败  homepage:" + source.getHomepage();
     LOGGER.error(e.getMessage() + errormsg, e);
     return;
   }
   String name = source.getName();
   try {
     List<ParseResult> list = FacebookPageParser.parse(html, source);
     store(list, name);
     source.setLastoptime(System.currentTimeMillis());
   } catch (Exception e) {
     LOGGER.error(e.getMessage(), e);
   }
 }
 /**
  * 当当前时间减去上次操作时间大于cycle(小时)时,即返回true,表示可以爬取,否则表示不需要爬取
  *
  * @param source
  * @return
  */
 private boolean shouldCrawl(FBSource source) {
   long curr = System.currentTimeMillis();
   long last = source.getLastoptime();
   LOGGER.info("上次运行时间 : " + new Timestamp(last));
   // 设定 可以提前10分钟开始
   long interval = (source.getCycle() * 60 - 10) * 60 * 1000l;
   if ((curr - last) >= interval) {
     return true;
   } else {
     LOGGER.info(
         source.getName()
             + "任务还未到开始时间!上次操作时间:"
             + new Timestamp(last)
             + " 现在:"
             + new Timestamp(curr));
     return false;
   }
 }