1. 概念
   1. Job
   2. Trigger
   3. Scheduler
2. Job
   1. Type
      1. Stateful
      2. Non-Stateful
   2. Listener
      1. scope
         1. global
         2. non-global
3. Trigger
   1. Calendar
   2. Priority
   3. Misfire
   4. Listener
      1. receive notifications
   5. CronTrigger
4. JobStore
   1. AdoJobStore
5. Enterprise Features
   1. Clustering
      1. load-balancing
      2. fail over