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;
	}

	}