Lesson 一: Using Quartz

Lesson 1: Using Quartz
Quartz Enterprise Job Scheduler Tutorial

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Before you can use the scheduler, it needs to be instantiated (who'd have guessed?). To do this, you use aSchedulerFactory. Some users of Quartz may keep an instance of a factory in a JNDI store, others may find itjust as easy (or easier) to instantiate and use a factory instance directly (such as in the example below).

Once a scheduler is instantiated, it can be started, placed in stand-by mode, and shutdown. Note that once ascheduler is shutdown, it cannot be restarted without being re-instantiated. Triggers do not fire (jobs do not execute)until the scheduler has been started, nor while it is in the paused state.

Here's a quick snippet of code, that instantiates and starts a scheduler, and schedules a job for execution:

  SchedulerFactory schedFact = new org.quartz.impl.StdSchedulerFactory();  Scheduler sched = schedFact.getScheduler();  sched.start();  // define the job and tie it to our HelloJob class  JobDetail job = newJob(HelloJob.class)      .withIdentity("myJob", "group1")      .build();          // Trigger the job to run now, and then every 40 seconds  Trigger trigger = newTrigger()      .withIdentity("myTrigger", "group1")      .startNow()      .withSchedule(simpleSchedule()          .withIntervalInSeconds(40)          .repeatForever())                  .build();          // Tell quartz to schedule the job using our trigger  sched.scheduleJob(job, trigger);

As you can see, working with quartz is rather simple. In Lesson 2 we'll give a quick overview of Jobs and Triggers, and Quartz's API so that you can more fully understand this example.