/**
  * Sets the notification in processed state.
  *
  * @param notification the notification
  */
 protected void unlock(final ImportNotification notification) {
   notification.setState(ImportNotificationState.PROCESSED);
   importNotificationDao.update(notification);
   if (LOG.isDebugEnabled()) {
     LOG.debug(
         "Import notification has been processed. Process ID: " + notification.getProcessId());
   }
 }
 /**
  * Tries to lock the notification by setting it into in_process state.
  *
  * @param notification the notification to lock
  * @return true if the lock has been gained successfully
  */
 protected boolean lock(final ImportNotification notification) {
   if (ObjectUtils.equals(ImportNotificationState.IN_PROCESS, notification.getState())) {
     return false;
   }
   // set in process on notification so that no other parties should take it over
   notification.setState(ImportNotificationState.IN_PROCESS);
   try {
     // update the notification which makes sure that no other participants will take it for
     // processing
     // could throw OptimisticLockException wrapped in EpPersistenceException when some other party
     // has updated the same object which means that it was already locked
     importNotificationDao.update(notification);
   } catch (EpPersistenceException exc) {
     LOG.debug("Cannot gain lock over notification: " + notification, exc);
     return false;
   }
   return true;
 }