从源码分析中可以看出，任务的整个调度过程为，初始化线程池，及调度器QuartzScheduler，然后由线程池去执行QuartzSchedulerThread,将触发器任务(job与触发器)添加到存储器（TreeSet，timeTrriger）中，然后启动调度器，QuartzSchedulerThread从timeTrriger去除待触发的任务，并包装成TriggerFiredBundle，然后由JobRunShellFactory 
创建TriggerFiredBundle的执行线程JobRunShell， 调度执行通过线程池SimpleThreadPool去执行JobRunShell，而JobRunShell执行的就是job.execute(JobExecutionContext context)。Quartz主要中的集合类有ArrayList，LinkedList，HashMap，TreeSet(TreeMap);之所以用到上面四个集合类，主要用到集合的如下特点：ArrayList访问速度快，LinkedList添加删除元素快；HashMap添加删除快，TreeSet访问速度快。

触发任务创建工厂类 

Java代码  下载 

1. public class JTAJobRunShellFactory  

2.     implements JobRunShellFactory  

3. {  

4.     public void initialize(Scheduler sched)  

5.         throws SchedulerConfigException  

6.     {  

7.         scheduler = sched;  

8.     }  

9.     public JobRunShell createJobRunShell(TriggerFiredBundle bundle)  

10.         throws SchedulerException  

11.     {  

12.         return new JTAJobRunShell(scheduler, bundle);  

13.     }  

14.     private Scheduler scheduler;  

15. }  

//触发任务运行类 

Java代码  下载 

1. public class JTAJobRunShell extends JobRunShell  

2. {  

3.   

4.     public JTAJobRunShell(Scheduler scheduler, TriggerFiredBundle bndle)  

5.     {  

6.         super(scheduler, bndle);  

7.         transactionTimeout = null;  

8.     }  

9. }  

10. public class JobRunShell extends SchedulerListenerSupport  

11.     implements Runnable  

12. {  

13. public JobRunShell(Scheduler scheduler, TriggerFiredBundle bndle)  

14.     {  

15.         jec = null;  

16.         qs = null;  

17.         firedTriggerBundle = null;  

18.         this.scheduler = null;  

19.         shutdownRequested = false;  

20.         this.scheduler = scheduler;  

21.         firedTriggerBundle = bndle;  

22.     }  

23.      public void run()  

24.     {  

25.         //添加到内部监听器  

26.         qs.addInternalSchedulerListener(this);  

27. label0:  

28.         {  

29.        //protected JobExecutionContextImpl jec,job执行上下文  

30.             OperableTrigger trigger = (OperableTrigger)jec.getTrigger();  

31.             JobDetail jobDetail = jec.getJobDetail();  

32.             org.quartz.Trigger.CompletedExecutionInstruction instCode;  

33.             do  

34.             {  

35.                 JobExecutionException jobExEx = null;  

36.                 Job job = jec.getJobInstance();  

37.                 try  

38.                 {  

39.                     begin();  

40.                 }  

41.                 catch(SchedulerException se)  

42.                 {  

43.                     qs.notifySchedulerListenersError((new StringBuilder()).append("Error executing Job (").append(jec.getJobDetail().getKey()).append(": couldn‘t begin execution.").toString(), se);  

44.                     break label0;  

45.                 }  

46.                 try  

47.                 {  

48.                     if(!notifyListenersBeginning(jec))  

49.                         break label0;  

50.                 }  

51.                 catch(VetoedException ve)  

52.                 {  

53.                     try  

54.                     {  

55.                         org.quartz.Trigger.CompletedExecutionInstruction instCode = trigger.executionComplete(jec, null);  

56.                         qs.notifyJobStoreJobVetoed(trigger, jobDetail, instCode);  

57.                         if(jec.getTrigger().getNextFireTime() == null)  

58.                             qs.notifySchedulerListenersFinalized(jec.getTrigger());  

59.                         complete(true);  

60.                     }  

61.                     catch(SchedulerException se)  

62.                     {  

63.                         qs.notifySchedulerListenersError((new StringBuilder()).append("Error during veto of Job (").append(jec.getJobDetail().getKey()).append(": couldn‘t finalize execution.").toString(), se);  

64.                     }  

65.                     break label0;  

66.                 }  

67.                 long startTime = System.currentTimeMillis();  

68.                 long endTime = startTime;  

69.                 try  

70.                 {  

71.                     log.debug((new StringBuilder()).append("Calling execute on job ").append(jobDetail.getKey()).toString());  

72.                     //执行Job，关键  

73.             job.execute(jec);  

74.                     endTime = System.currentTimeMillis();  

75.                 }  

76.                 catch(JobExecutionException jee)  

77.                 {  

78.                     endTime = System.currentTimeMillis();  

79.                     jobExEx = jee;  

80.                     getLog().info((new StringBuilder()).append("Job ").append(jobDetail.getKey()).append(" threw a JobExecutionException: ").toString(), jobExEx);  

81.                 }  

82.                 catch(Throwable e)  

83.                 {  

84.                     endTime = System.currentTimeMillis();  

85.                     getLog().error((new StringBuilder()).append("Job ").append(jobDetail.getKey()).append(" threw an unhandled Exception: ").toString(), e);  

86.                     SchedulerException se = new SchedulerException("Job threw an unhandled exception.", e);  

87.                     qs.notifySchedulerListenersError((new StringBuilder()).append("Job (").append(jec.getJobDetail().getKey()).append(" threw an exception.").toString(), se);  

88.                     jobExEx = new JobExecutionException(se, false);  

89.                 }  

90.         //设置jJobExecutionContext运行时间  

91.                 jec.setJobRunTime(endTime - startTime);  

92.                 if(!notifyJobListenersComplete(jec, jobExEx))  

93.                     break label0;  

94.                 instCode = org.quartz.Trigger.CompletedExecutionInstruction.NOOP;  

95.                 try  

96.                 {  

97.                     instCode = trigger.executionComplete(jec, jobExEx);  

98.                 }  

99.                 catch(Exception e)  

100.                 {  

101.                     SchedulerException se = new SchedulerException("Trigger threw an unhandled exception.", e);  

102.                     qs.notifySchedulerListenersError("Please report this error to the Quartz developers.", se);  

103.                 }  

104.                 if(!notifyTriggerListenersComplete(jec, instCode))  

105.                     break label0;  

106.                 if(instCode == org.quartz.Trigger.CompletedExecutionInstruction.RE_EXECUTE_JOB)  

107.                 {  

108.                     jec.incrementRefireCount();  

109.                     try  

110.                     {  

111.                         complete(false);  

112.                     }  

113.                     catch(SchedulerException se)  

114.                     {  

115.                         qs.notifySchedulerListenersError((new StringBuilder()).append("Error executing Job (").append(jec.getJobDetail().getKey()).append(": couldn‘t finalize execution.").toString(), se);  

116.                     }  

117.                     continue;  

118.                 }  

119.                 try  

120.                 {  

121.                     complete(true);  

122.                     break;  

123.                 }  

124.                 catch(SchedulerException se)  

125.                 {  

126.                     qs.notifySchedulerListenersError((new StringBuilder()).append("Error executing Job (").append(jec.getJobDetail().getKey()).append(": couldn‘t finalize execution.").toString(), se);  

127.                 }  

128.             } while(true);  

129.         //通知job执行完成  

130.             qs.notifyJobStoreJobComplete(trigger, jobDetail, instCode);  

131.         }  

132.         qs.removeInternalSchedulerListener(this);  

133.         break MISSING_BLOCK_LABEL_710;  

134.         Exception exception;  

135.         exception;  

136.         qs.removeInternalSchedulerListener(this);  

137.         throw exception;  

138.     }  

139.     protected JobExecutionContextImpl jec;//job执行上下文  

140.     protected QuartzScheduler qs;  

141.     protected TriggerFiredBundle firedTriggerBundle;  

142.     protected Scheduler scheduler;  

143.     protected volatile boolean shutdownRequested;  

144.     private final Logger log = LoggerFactory.getLogger(getClass());  

145. }  

//TriggerKey，JobKey包装类 

Java代码  下载 

1. class TriggerWrapper  

2. {  

3.   

4.     TriggerWrapper(OperableTrigger trigger)  

5.     {  

6.         state = 0;  

7.         if(trigger == null)  

8.         {  

9.             throw new IllegalArgumentException("Trigger cannot be null!");  

10.         } else  

11.         {  

12.             this.trigger = trigger;  

13.             key = trigger.getKey();  

14.             jobKey = trigger.getJobKey();  

15.             return;  

16.         }  

17.     }  

18.   

19.     public boolean equals(Object obj)  

20.     {  

21.         if(obj instanceof TriggerWrapper)  

22.         {  

23.             TriggerWrapper tw = (TriggerWrapper)obj;  

24.             if(tw.key.equals(key))  

25.                 return true;  

26.         }  

27.         return false;  

28.     }  

29.   

30.     public int hashCode()  

31.     {  

32.         return key.hashCode();  

33.     }  

34.   

35.     public OperableTrigger getTrigger()  

36.     {  

37.         return trigger;  

38.     }  

39.   

40.     public final TriggerKey key;  

41.     public final JobKey jobKey;  

42.     public final OperableTrigger trigger;  

43.     public int state;  

44.     public static final int STATE_WAITING = 0;//等待  

45.     public static final int STATE_ACQUIRED = 1;//就绪  

46.     public static final int STATE_EXECUTING = 2;//执行  

47.     public static final int STATE_COMPLETE = 3;//完成  

48.     public static final int STATE_PAUSED = 4;//暂停  

49.     public static final int STATE_BLOCKED = 5;//阻塞  

50.     public static final int STATE_PAUSED_BLOCKED = 6;//暂停阻塞  

51.     public static final int STATE_ERROR = 7;//错误  

52. }  

//简单触发器 

Java代码  下载 

1. public class SimpleTriggerImpl extends AbstractTrigger  

2.     implements SimpleTrigger, CoreTrigger  

3. {  

4.  //获取下一次触发时间  

5.  public Date getNextFireTime()  

6.     {  

7.         return nextFireTime;  

8.     }  

9.  private Date startTime;  

10.     private Date endTime;  

11.     private Date nextFireTime;  

12.     private Date previousFireTime;  

13.     private int repeatCount;  

14.     private long repeatInterval;  

15.     private int timesTriggered;  

16.     private boolean complete;  

17.   

18. }  

//触发任务包装类 

Java代码  下载 

1. public class TriggerFiredBundle  

2.     implements Serializable  

3. {  

4. public TriggerFiredBundle(JobDetail job, OperableTrigger trigger, Calendar cal, boolean jobIsRecovering, Date fireTime, Date scheduledFireTime, Date prevFireTime,   

5.             Date nextFireTime)  

6.     {  

7.         this.job = job;  

8.         this.trigger = trigger;  

9.         this.cal = cal;  

10.         this.jobIsRecovering = jobIsRecovering;  

11.         this.fireTime = fireTime;  

12.         this.scheduledFireTime = scheduledFireTime;  

13.         this.prevFireTime = prevFireTime;  

14.         this.nextFireTime = nextFireTime;  

15.     }  

16.     private JobDetail job;  

17.     private OperableTrigger trigger;  

18.     private Calendar cal;  

19.     private boolean jobIsRecovering;  

20.     private Date fireTime;  

21.     private Date scheduledFireTime;  

22.     private Date prevFireTime;  

23.     private Date nextFireTime;  

24. }  

//触发任务包装结果类 

Java代码  下载 

1. public class TriggerFiredResult  

2. {  

3.     public TriggerFiredResult(TriggerFiredBundle triggerFiredBundle)  

4.     {  

5.         this.triggerFiredBundle = triggerFiredBundle;  

6.     }  

7.     private TriggerFiredBundle triggerFiredBundle;  

8.     private Exception exception;  

9. }  

Quartz任务调度源码分析