改变石英作业计划 [英] Altering Quartz Job Schedule

问题描述

我正在考虑使用Quartz安排我的应用程序，但在所有情况下，作业触发器似乎是一次性活动，并且对触发器的更改需要重新启动应用程序-seployed生效。

有没有办法可以让工作触发检查工作时间表的更改，而无需重新部署代码？

谢谢，

I'm looking into scheduling my application with Quartz, but in all cases, the job trigger seems to be a one-time activity, and changes to the trigger need the application to be re-deployed to take effect.
Is there any way I can have the job trigger check for changes to the job schedule without having to redeploy the code?
Thanks,

推荐答案

1. 陷阱某些用户驱动的事件，例如更新文本值，例如a用于安排工作的cron-string


2. 找到并取消安排/删除旧作业并触发。



3. 再次安排作业，使用新触发器。

1. Trap some user-driven event, like updating a text value, for example a cron-string to schedule a job
2. Locate and unschedule/delete the old job and trigger.

3. Schedule the job again, using the new trigger.

public static <T> T scheduleCronJob(Class<T> clazz, String cronString, String uid){
    try{            
        if(cronString == null){
            throw new CronStringConfigurationException();
        }

        String jobGroupName = "cronJobsGroup";
        String jobName = "cronJob" + uid;
        String triggerGroupName = "cronTriggers";
        String triggerName = "triggerFor" + uid;

        JobDetail jobDetail = new JobDetail(jobName, jobGroupName, clazz);

        CronTrigger trigger = new CronTrigger(
                triggerName, triggerGroupName, 
                jobName, jobGroupName, 
                cronString);

        JobDataMap jobDataMap = new JobDataMap();
        jobDetail.setJobDataMap(jobDataMap);

        getScheduler().scheduleJob(jobDetail, trigger);
    } catch(Exception e){
    // print error message, throw stack trace
    }
    return null;
}

public static void reloadCronJob(Class clazz, String cronString, String uid) throws SystemException, ParseException, SchedulerException, 
    CronStringConfigurationException, PortalException{
    // locate the job 
    String jobGroupName = "cronJobs";
    String jobName = "jobFor" + uid;

    if(cronString == null){
        throw new CronStringConfigurationException();
    }

    JobDetail jobDetail = null;
    Class<?> jobClass = null;

    // remove the old job/trigger if it exists
    try{
        jobDetail = scheduler.getJobDetail(jobName, jobGroupName);
        if(jobDetail != null){
            jobClass = jobDetail.getJobClass();
        }
        scheduler.deleteJob(jobName, jobGroupName);
    } catch(Exception e){
        e.printStackTrace();
    }

    if(jobClass == null){
        jobClass = clazz;
    }

    // create a new trigger
    scheduleCronJob(jobClass, expandoColumnName, uid);

    System.out.println("(re)scheduled job " + jobName + " using new cron string " + cronString);
}

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