quartz 2.3.0 学习笔记

概述

• 参考
  
  • https://www.ibm.com/developerworks/cn/opensource/os-cn-quartz/
  • https://github.com/quartz-scheduler/quartz
  • https://tech.meituan.com/mt-crm-quartz.html
  • http://www.quartz-scheduler.org/documentation/quartz-2.2.x/tutorials/tutorial-lesson-02.html

Scheduler—->调度器,负责维护JobDeatil与Trigger关系,根据Trigger调度Job

• StdScheduler—->Scheduler
  
  • Scheduler—->提供调度器的start/standby/shutdown,以JobKey标示的任务的添加/删除/触发
    
    • scheduleJob提供JobDetail与Trigger的绑定机制
    • start进行调度器初始化,实际上委托给QuartzScheduler进行start
  • StdScheduler为QuartzScheduler的代理类,相关调度器操作委托给QuartzScheduler进行
• QuartzScheduler—->RemotableQuartzScheduler—->Remote
  
  • QuartzScheduler为quartz的核心类
    
    • QuartzScheduler.start是通知schedThread.togglePause(false)开启任务调度
• QuartzSchedulerThread—->quarzt任务调度执行线程,负责
  
  • qsRsrcs.getJobStore().acquireNextTriggers—->默认获取30s内的将要执行的触发器
  • qsRsrcs.getJobStore().triggersFired—->修改触发器状态为STATE_ACQUIRED
  • qsRsrcs.getThreadPool().runInThread(shell)—->在JobRunShell中执行JobDetail的业务逻辑
  • qs.notifyJobStoreJobComplete(trigger, jobDetail, instCode)—->通过触发器机制,修改job与触发器状态
• StdSchedulerFactory—->SchedulerFactory
• SchedulerFactory提供创建Scheduler工厂

JobDetail/Job—->提供job信息的描述与执行机制

• JobDetailImpl—->JobDetail
  
  • JobDetailImpl记录job实例的name/group/description/jobClass/key等属性
• Job—->定义业务需要实现execute方法
• JobRunShell/JobRunShellFactory
  
  • JobRunShell提供执行job任务开始/完成通知操作,提供安全的环境,捕获所有异常(Throwable)的机制,转换为JobExecutionException

Trigger—->用于定义Job合适/怎么被调度

• SimpleTriggerImpl—->SimpleTrigger—->Trigger
• SimpleTriggerImpl—->CoreTrigger—->Trigger
• SimpleTriggerImpl—->AbstractTrigger—->OperableTrigger—->MutableTrigger—->Trigger
  
  • Trigger定义触发器的状态/执行情况/相关联的JobKey/getCalendarName/getNextFireTime/getPreviousFireTime
  • MutableTrigger提供修改TriggerKey/JobKey/calendarName/JobDataMap/startTime/endTime机制
  • OperableTrigger提供触发triggered任务机制,标记任务执行完成executionComplete,修改setNextFireTime/setPreviousFireTime
  • AbstractTrigger所有触发器的抽象实现,提供默认实现

JobStore—->用于定义Job与Trigger如何进行存储

• JobStore—->定义了QuartzScheduler如何存储Job/Trigger
  
  • storeJobAndTrigger—->存储指定的JobDetail与Trigger,同时关联他们
  • acquireNextTriggers—->获取可执行的OperableTrigger列表
  • triggersFired—->修改触发器状态,保持执行状态
  • releaseAcquiredTrigger—->执行完成后,释放获取的触发器
  • triggeredJobComplete—->通知触发器任务完成
• RAMJobStore—->JobStore
  
  • RAMJobStore,在内存中支持上述关系,利用相关的jobsByKey/triggersByKey/jobsByGroup/triggersByGroup/timeTriggers支持
• JobStoreTX—->JobStoreSupport—->JobStore
  
  • 利用JDBC-based完成上述关系,利用StdRowLockSemaphore行锁完成集群的环境的任务排斥
  • executeInNonManagedTXLock中利用getLockHandler().obtainLock行锁完成排斥动作

ListenerManager/SchedulerListener/JobListener/TriggerListener—->调度器/任务/触发器监听支持

• ListenerManagerImpl—->ListenerManager
• JobRunShell—->SchedulerListenerSupport—->SchedulerListener

其他支持

• SimpleThreadPool—->ThreadPool—->提供线程池支持
• JobKey—->Key—->提供唯一标示JobDetail
• TriggerKey—->Key—->提供唯一标示Trigger

测试