/**
* Relock trigger if its lock has expired.
*
* @param key trigger to lock
* @return true when successfully relocked
*/
public boolean relockExpired(TriggerKey key) {
Document existingLock = locksDao.findTriggerLock(key);
if (existingLock != null) {
if (expiryCalculator.isTriggerLockExpired(existingLock)) {
// When a scheduler is defunct then its triggers become expired
// after sometime and can be recovered by other schedulers.
// To check that a trigger is owned by a defunct scheduler we evaluate
// its LOCK_TIME and try to reassign it to this scheduler.
// Relock may not be successful when some other scheduler has done
// it first.
log.info("Trigger {} is expired - re-locking", key);
return locksDao.relock(key, existingLock.getDate(Constants.LOCK_TIME));
} else {
log.info(
"Trigger {} hasn't expired yet. Lock time: {}",
key,
existingLock.getDate(Constants.LOCK_TIME));
}
} else {
log.warn(
"Error retrieving expired lock from the database for trigger {}. Maybe it was deleted",
key);
}
return false;
}
/**
* Unlock job that have existing, expired lock.
*
* @param job job to potentially unlock
*/
public void unlockExpired(JobDetail job) {
Document existingLock = locksDao.findJobLock(job.getKey());
if (existingLock != null) {
if (expiryCalculator.isJobLockExpired(existingLock)) {
log.debug("Removing expired lock for job {}", job.getKey());
locksDao.remove(existingLock);
}
}
}
/**
* Try to lock given trigger, ignoring errors.
*
* @param key trigger to lock
* @return true when successfully locked, false otherwise
*/
public boolean tryLock(TriggerKey key) {
try {
locksDao.lockTrigger(key);
return true;
} catch (MongoWriteException e) {
log.info("Failed to lock trigger {}, reason: {}", key, e.getError());
}
return false;
}
public void unlockAcquiredTrigger(OperableTrigger trigger) {
locksDao.unlockTrigger(trigger);
}
/**
* Lock job if it doesn't allow concurrent executions.
*
* @param job job to lock
*/
public void lockJob(JobDetail job) {
if (job.isConcurrentExectionDisallowed()) {
locksDao.lockJob(job);
}
}