PhabricatorFactLastUpdatedEngine.php
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	<?php

	/*
	* Copyright 2012 Facebook, Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/**
	* 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('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;
	}

	}