/**
* Run scheduled event triggers which are due for execution.
*
* @return void
*/
private function executeTriggers()
{
// We run only a limited number of triggers before ending the execution
// phase. If we ran until exhaustion, we could end up executing very
// out-of-date triggers if there was a long backlog: trigger changes
// during this phase are not reflected in the event table until we run
// another scheduling phase.
// If we exit this phase with triggers still ready to execute we'll
// jump back into the scheduling phase immediately, so this just makes
// sure we don't spend an unreasonably long amount of time without
// processing trigger updates and doing rescheduling.
$limit = 100;
$now = PhabricatorTime::getNow();
$triggers = id(new PhabricatorWorkerTriggerQuery())->setViewer($this->getViewer())->setOrder(PhabricatorWorkerTriggerQuery::ORDER_EXECUTION)->withNextEventBetween(null, $now)->needEvents(true)->setLimit($limit)->execute();
foreach ($triggers as $trigger) {
$event = $trigger->getEvent();
// Execute the trigger action.
$trigger->executeTrigger($event->getLastEventEpoch(), $event->getNextEventEpoch());
// Now that we've executed the trigger, the current trigger epoch is
// going to become the last epoch.
$last_epoch = $event->getNextEventEpoch();
// If this is a recurring trigger, give it an opportunity to reschedule.
$reschedule_epoch = $trigger->getNextEventEpoch($last_epoch, $is_reschedule = true);
// Don't reschedule events unless the next occurrence is in the future.
if ($reschedule_epoch !== null && $last_epoch !== null && $reschedule_epoch <= $last_epoch) {
throw new Exception(pht('Trigger is attempting to perform a routine reschedule where ' . 'the next event (at %s) does not occur after the previous event ' . '(at %s). Routine reschedules must strictly move event triggers ' . 'forward through time to avoid executing a trigger an infinite ' . 'number of times instantaneously.', $reschedule_epoch, $last_epoch));
}
$new_event = PhabricatorWorkerTriggerEvent::initializeNewEvent($trigger)->setLastEventEpoch($last_epoch)->setNextEventEpoch($reschedule_epoch);
$event->openTransaction();
// Remove the event we just processed.
$event->delete();
// See note in the scheduling phase about this; we save the new event
// even if the next epoch is `null`.
$new_event->save();
$event->saveTransaction();
}
}
public static function initializeNewEvent(PhabricatorWorkerTrigger $trigger)
{
$event = new PhabricatorWorkerTriggerEvent();
$event->setTriggerID($trigger->getID());
return $event;
}