code: @Override
  	public void check() throws JMSException
      {
          Iterator<User> users = userMap.values().iterator();
          while (users.hasNext())
          {
              User user = users.next();
              user.check();
          }
      }
docs: /*
  (non-Javadoc)
  @see net.timewalker.ffmq4.utils.Checkable#check()