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public class CustomJobServiceImpl extends SimpleServiceComponent implements CustomJobService {
   public void onStart() {
      // Run the job only on the master and not on the read-only slaves
       if (myJcrRepositoryService.isReadOnly()) {
          LOG.warning("This cluster is read only. This job is only executed on the master. Job '" + JOB_NAME + "' not scheduled.");

         return;
   }
   public void onStop() {
      // Stop listening to update events on the schedule
      myConfigurationManagement.removeListener(this);

      // Remove the job from the schedule
      unscheduleJob();
   }
   public void run(SchedulerJob job) {
      // Check whether this instance is the cluster task master
      if (!myFrameworkConfig.isClusterTaskMaster()) {
         LOG.log(Level.INFO, "Execution of job '" + JOB_NAME + "' skipped on this server.");
         return;
      }
}