大数据基础之Quartz（1）简介、源代码解析

一简介

官网

http://www.quartz-scheduler.org/

What is the Quartz Job Scheduling Library?

Quartz is a richly featured, open source job scheduling library that can be integrated within virtually any Java application - from the smallest stand-alone application to the largest e-commerce system. Quartz can be used to create simple or complex schedules for executing tens, hundreds, or even tens-of-thousands of jobs; jobs whose tasks are defined as standard Java components that may execute virtually anything you may program them to do. The Quartz Scheduler includes many enterprise-class features, such as support for JTA transactions and clustering.

二 代码解析

开启分布式

org.quartz.jobStore.class=org.quartz.impl.jdbcjobstore.JobStoreTX

org.quartz.jobStore.isClustered=true

启动过程

QuartzScheduler.start

         QuartzSchedulerResources.getJobStore

                  StdSchedulerFactory.instantiate (org.quartz.jobStore.class)

                          JobStoreSupport.setLockHandler (org.quartz.jobStore.lockHandler.class)

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                          JobStoreSupport.initialize

                                   setLockHandler (StdRowLockSemaphore)

         JobStoreSupport.schedulerStarted

                  ClusterManager.initialize

                          run

                                   manage

                                            doCheckin

                                                     clusterCheckIn

                                                     Semaphore.obtainLock

                                                             StdRowLockSemaphore.executeSQL (select for update and insert)

                                                     clusterRecover

                          signalSchedulingChangeImmediately

                                   SchedulerSignaler.signalSchedulingChange

                                            QuartzSchedulerThread.signalSchedulingChange

QuartzSchedulerThread.run

         JobStore.acquireNextTriggers

         JobStore.triggersFired