Java Quartz Scheduler状态

Question

我尝试使用下面的代码检查Quartz Scheduler状态，但状态返回令人困惑。为什么在关闭调度程序后，isStarted状态仍然为true，在重新启动调度程序后，isShutDown状态为true。

if (logger.isLoggable(Level.INFO)) { 
    logger.info("Before: Stand by: " 
     + this.scheduler.isInStandbyMode() + ", Start: " 
     + this.scheduler.isStarted() + ", Shutdown: " 
     + this.scheduler.isShutdown()); 
} 

this.scheduler.start(); 

if (logger.isLoggable(Level.INFO)) { 
    logger.info("After: Stand by: " 
     + this.scheduler.isInStandbyMode() + ", Start: " 
     + this.scheduler.isStarted() + ", Shutdown: " 
     + this.scheduler.isShutdown()); 
} 

//Shutdown scheduler 
this.scheduler.shutdown(true); 
if (logger.isLoggable(Level.INFO)) { 
    logger.info("Schedule stop: Stand by: " 
      + this.scheduler.isInStandbyMode() + ", Start: " 
      + this.scheduler.isStarted() + ", Shutdown: " 
      + this.scheduler.isShutdown()); 
} 

//Restart scheduler 
this.scheduler.start(); 
if (logger.isLoggable(Level.INFO)) { 
    logger.info("schedule start: Stand by: " 
      + this.scheduler.isInStandbyMode() + ", Start: " 
      + this.scheduler.isStarted() + ", Shutdown: " 
      + this.scheduler.isShutdown()); 
} 

而结果回报

• 信息：前：站在一边：真，开始：假的，关机：假
• INFO：后：通过支架：假的，启动：真实，关机：假
• 信息：计划停止：通过支架：真实，开始：真，关机：真
• 信息：计划的开始：通过支架：真实，开始：真，关机：真

Answer 1

虽然这可能看起来像一个错误，但它实际上是通过设计。 isStarted（）和isShutdown（）方法不会报告Quartz Scheduler的当前状态，而只是用于确定在过去的某个时间点Scheduler是否已启动或关闭。请参阅以下Javadoc：

/** 
* Whether the scheduler has been started. 
* 
* <p> 
* Note: This only reflects whether <code>{@link #start()}</code> has ever 
* been called on this Scheduler, so it will return <code>true</code> even 
* if the <code>Scheduler</code> is currently in standby mode or has been 
* since shutdown. 
* </p> 
* 
* @see #start() 
* @see #isShutdown() 
* @see #isInStandbyMode() 
*/  
boolean isStarted() throws SchedulerException;