testing

PhabricatorFactLastUpdatedEngine.php
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			<?php

			/**
			* Engine that records the time facts were last updated.
			*/
			final class PhabricatorFactLastUpdatedEngine extends PhabricatorFactEngine {

			public function getFactSpecs(array $fact_types) {
			$results = array();
			foreach ($fact_types as $type) {
			if ($type == 'updated') {
			$results[] = id(new PhabricatorFactSimpleSpec($type))
			->setName(pht('Facts Last Updated'))
			->setUnit(PhabricatorFactSimpleSpec::UNIT_EPOCH);
			}
			}
			return $results;
			}

			public function shouldComputeAggregateFacts() {
			return true;
			}

			public function computeAggregateFacts() {
			$facts = array();

			$facts[] = id(new PhabricatorFactAggregate())
			->setFactType('updated')
			->setValueX(time());

			return $facts;
			}

			}