Question

我在下面编写代码，我正在运行两个工作。首先是10秒的间隔，另一个是3秒的间隔。但最终在某些时候它们会同时执行。有没有机制来避免这种情况

    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
                    }
                }
            }

Answer 2

Configure the Quartz threadpool只有一个帖子。

org.quartz.threadPool.threadCount=1

Answer 3

您可以创建一个辅助对象来使两个作业同步：

//In the base class 
public static Object lock = new Object();

//In the first class
public void execute() {
    synchronized(lock) {
        //do stuff
    }
}

//In the second class
public void execute() {
    synchronized(lock) {
        //do stuff
    }
}

详细了解同步： http://docs.oracle.com/javase/tutorial/essential/concurrency/locksync.html

Answer 4

你试过了吗？

org.quartz.jobStore.isClustered: true

或者，您将工作变为有状态的工作（并将isClustered设置为true），并且shoujld解决您的问题。（糟糕，不推荐使用StatefulJob;请使用DisallowConcurrentExecution。）

如何避免在Quartz中同时运行两个作业？

4 个答案: