How to interrupt or stop currently running quartz

问题:

I have some tasks that are executed with the help of Java Quartz Jobs, but I need to stop some tasks by some condition in my code. I read that this can be done via InterruptableJob. But i didn't understand in what way i should do it?

回答1:

You need to write a your job as an implementation of InterruptableJob. To interrupt this job, you need handle to Scheduler , and call interrupt(jobKey<<job name & job group>>)

Please have a look @ javadoc for above classes, also quartz distribution contains an example for this (example7).

回答2:

In Quartz 2.1 with Spring you can:

@Autowired
private Scheduler schedulerFactoryBean; //injected by spring
...
...

List<JobExecutionContext> currentlyExecuting = schedulerFactoryBean.getCurrentlyExecutingJobs();

//verifying if job is running       
for (JobExecutionContext jobExecutionContext : currentlyExecuting) {
    if(jobExecutionContext.getJobDetail().getKey().getName().equals("JobKeyNameToInterrupt")){
        result = schedulerFactoryBean.interrupt(jobExecutionContext.getJobDetail().getKey());
    }
}

回答3:

The best solution in my opinion is the one described in this thread: http://forums.terracotta.org/forums/posts/list/7700.page

I've just introduced a "sleep" after set stop flag to true to allow the job to finish cleanly.

    @Override
public void interrupt() throws UnableToInterruptJobException {
    stopFlag.set(true);
    try {
        Thread.sleep(30000);
    } catch (InterruptedException e) {
        //logger.error("interrupt()", e);
    }
    Thread thread = runningThread.getAndSet(null);
    if (thread != null)
        thread.interrupt();
}

回答4:

I don't know why nobody mentioned this, or maybe this was not available at the time the question was asked.

There is a method called shutdown for a Scheduler instance.

 SchedulerFactory factory = new StdSchedulerFactor();
 Scheduler scheduler = factory.getScheduler();

The above is used to start a job like

 scheduler.start();

Use a flag or something to know when to stop the job from running. Then use

 scheduler.shutdown();

How I implemented my requirement:

if(flag==true)
    {
        scheduler.start();
        scheduler.scheduleJob(jobDetail, simpleTrigger);
    }
    else if(flag==false)
    {
        scheduler.shutdown();
    }

Where jobDetail and simpleTrigger are self explanatory.

Hope it helps. :)