PhabricatorMetronomicTriggerClock.php
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	<?php

	/**
	* Triggers an event repeatedly, delaying a fixed number of seconds between
	* triggers.
	*
	* For example, this clock can trigger an event every 30 seconds.
	*/
	final class PhabricatorMetronomicTriggerClock extends PhabricatorTriggerClock {

	public function validateProperties(array $properties) {
	PhutilTypeSpec::checkMap(
	$properties,
	array(
	'period' => 'int',
	));
	}

	public function getNextEventEpoch($last_epoch, $is_reschedule) {
	$period = $this->getProperty('period');

	if ($last_epoch) {
	$next = $last_epoch + $period;
	$next = max($next, $last_epoch + 1);
	} else {
	$next = PhabricatorTime::getNow() + $period;
	}

	return $next;
	}

	}