java - 如何避免在 Quartz 中同时运行两个作业？

Question

我在下面的代码中运行了两个作业。第一个间隔为 10 秒，另一个间隔为 3 秒。但最终在某个时候它们会同时执行。有什么机制可以避免这种情况

    JobDetail jDetail = new JobDetail("Job1", "group1", MyJob.class);
    CronTrigger crTrigger = new CronTrigger("cronTrigger", "group1", "0/10 * * * * ?");
    sche.scheduleJob(jDetail, crTrigger);

    jDetail = new JobDetail("Job2","group2",MyJob2.class);
    crTrigger = new CronTrigger("cronTrigger2","group2","0/3 * * * * ?");
    sche.scheduleJob(jDetail, crTrigger);

Answer 1

没有完全回答你的问题，但这是你如何查询以线程安全的方式运行的东西:

//sched is your org.quartz.Scheduler
        synchronized (sched) {
            JobDetail existingJobDetail = sched.getJobDetail(jobName, jobGroup);
            if (existingJobDetail != null) {
                List<JobExecutionContext> currentlyExecutingJobs = (List<JobExecutionContext>) sched.getCurrentlyExecutingJobs();
                for (JobExecutionContext jec : currentlyExecutingJobs) {

                    if (existingJobDetail.equals(jec.getJobDetail())) {
                        // This job is currently executing
                    }
                }
            }