public void onTabClose(TabCloseEvent event) {
   Object data = event.getData();
   if (data != null && data instanceof LogTableBean) {
     LogTableBean ltb = (LogTableBean) data;
     tabs.remove(ltb);
     if (ltb.getLogFile() != null && ltb.getLogFile().getHandler() != null) {
       tabSet.remove(ltb.getLogFile().getHandler());
       dbManager.removeLogfile(ltb.getLogFile().getHandler());
     }
   }
 }
 public int addTab(LogTableBean ltb) {
   if (tabSet == null) tabSet = new HashMap<String, LogTableBean>();
   String key = ltb.getLogFile().getHandler();
   if (tabSet.containsKey(key)) {
     tabs.remove(tabSet.get(key));
   }
   tabs.add(ltb);
   tabSet.put(key, ltb);
   return tabs.size() - 1;
 }