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POquartz: Run single instance per JVM
 

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    <p>I am using Quartz Scheduler 2.2.0 in my Java SSE (Java Flex) Application. I have set a schedule that run every day at 10:00am and perform some job. I didn't shutdown Quartz Scheduler because I want it to run everyday.</p> <p>But Is there anyway I know that Quartz Scheduler is already running because if I start it when user open my Java Flex Application so multiple instances exists.</p> <p>Is there any way I can get JVM process running on computer and I can see that Quartz Scheduler process is already up so I don't need to run it again or If I run it again it should automatically check if one instance exists so it should throw an exception.</p> <p>I am giving my Configuration XML file below, hope this helps...</p> <blockquote> <p>quartz.properties</p> </blockquote> <pre><code>#============================================================================ # Configure Main Scheduler Properties #============================================================================ org.quartz.scheduler.instanceName: SF-Tasks-Scheduler org.quartz.scheduler.instanceId: Quartz_Instance_1 org.quartz.scheduler.instanceIdGenerator.class: org.quartz.simpl.HostnameInstanceIdGenerator org.quartz.scheduler.skipUpdateCheck: true org.quartz.scheduler.makeSchedulerThreadDaemon: true #============================================================================ # Configure ThreadPool #============================================================================ org.quartz.threadPool.class: org.quartz.simpl.SimpleThreadPool org.quartz.threadPool.threadCount: 1 org.quartz.threadPool.threadPriority: 5 #============================================================================ # Configure JobStore #============================================================================ org.quartz.jobStore.misfireThreshold: 60000 org.quartz.jobStore.class: org.quartz.simpl.RAMJobStore #============================================================================ # Configure Plugins #============================================================================ org.quartz.plugin.triggHistory.class = \org.quartz.plugins.history.LoggingTriggerHistoryPlugin org.quartz.plugin.triggHistory.triggerFiredMessage = Trigger {1}.{0} fired job {6}.{5} at\: {4, date, HH\:mm\:ss MM/dd/yyyy} org.quartz.plugin.triggHistory.triggerCompleteMessage = Trigger {1}.{0} completed firing job {6}.{5} at {4, date, HH\:mm\:ss MM/dd/yyyy} </code></pre> <p>and this is how I schedule my jobs</p> <pre><code>try { Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler(); JobDetail jobTaskUpdater = JobBuilder.newJob(JobTaskUpdater.class).withIdentity(JobTaskUpdater.class.getName(), GROUP_TASK_JOB_DETAIL).build(); Trigger trigger = TriggerBuilder.newTrigger().withIdentity(NAME_TRIGGER_TASK_UPDATER, GROUP_TASK_TRIGGER).withSchedule(SimpleScheduleBuilder.repeatMinutelyForever()).build(); JobTaskUpdaterStatusListener listener = new JobTaskUpdaterStatusListener(); KeyMatcher&lt;JobKey&gt; matcherTaskUpdater = KeyMatcher.keyEquals(jobTaskUpdater.getKey()); scheduler.getListenerManager().addJobListener(listener, matcherTaskUpdater); scheduler.scheduleJob(jobTaskUpdater, trigger); scheduler.start(); } catch (SchedulerException e) { e.printStackTrace(); } </code></pre>
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