Java Web应用中的任务调度(1)

public void init(ActionServlet actionServlet,
                 ModuleConfig moduleConfig) {

  System.out.println("Initializing Scheduler PlugIn for Jobs!");
  // Retrieve the ServletContext
// 获取ServletContext
  ServletContext ctx = actionServlet.getServletContext();
  // The Quartz Scheduler
  // Quartz Scheduler对象
  Scheduler scheduler = null;

  // Retrieve the factory from the ServletContext.
  // It will be put there by the Quartz Servlet
  // 从ServletContext取得由Quartz Servlet放置在此的factory对象。
  StdSchedulerFactory factory =  (StdSchedulerFactory)
      ctx.getAttribute(QuartzInitializerServlet.QUARTZ_FACTORY_KEY);
   
  try{
        // Retrieve the scheduler from the factory
        // 从factory取得scheduler
        scheduler = factory.getScheduler();

        // Start the scheduler in case, it isn't started yet
        // 如果scheduler尚未启动，则启动它
        if (m_startOnLoad != null &&
            m_startOnLoad.equals(Boolean.TRUE.toString())){
            System.out.println("Scheduler Will start in " +
            m_startupDelayString + " milliseconds!");
            //wait the specified amount of time before
            // starting the process.
            // 在启动之前等待指定长度的时间
            Thread delayedScheduler =
                new Thread(new DelayedSchedulerStarted (
                                   scheduler, m_startupDelay));
            //give the scheduler a name. All good code needs a name
            //给任务调度器命名。好的代码总该有名字！
            delayedScheduler.setName("Delayed_Scheduler");
            //Start out scheduler
            //启动任务调度器
            delayedScheduler.start();
        }
  } catch (Exception e){
     e.printStackTrace();
  }
    sm_scheduler = scheduler;
}