Java Quartz Scheduler狀態

Question

我嘗試使用下面的代碼檢查Quartz Scheduler狀態，但狀態返回令人困惑。爲什麼在關閉調度程序後，isStarted狀態仍然爲true，在重新啓動調度程序後，isShutDown狀態爲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()); 
} 

而結果回報

• 信息：前：站在一邊：真，開始：假的，關機：假
• INFO：後：通過支架：假的，啓動：真實，關機：假
• 信息：計劃停止：通過支架：真實，開始：真，關機：真
• 信息：計劃的開始：通過支架：真實，開始：真，關機：真

Answer 1

雖然這可能看起來像一個錯誤，但它實際上是通過設計。 isStarted（）和isShutdown（）方法不會報告Quartz Scheduler的當前狀態，而只是用於確定在過去的某個時間點Scheduler是否已啓動或關閉。請參閱以下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;