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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;
			}

			}