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PhabricatorFactEngine.php
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			<?php

			abstract class PhabricatorFactEngine extends Phobject {

			private $factMap;
			private $viewer;

			final public static function loadAllEngines() {
			return id(new PhutilClassMapQuery())
			->setAncestorClass(__CLASS__)
			->execute();
			}

			/**
			* @return array All types of facts known by this FactEngine
			*/
			abstract public function newFacts();

			/**
			* @return bool
			*/
			abstract public function supportsDatapointsForObject(
			PhabricatorLiskDAO $object);

			/**
			* Add new datapoints (due to a transaction) about an object
			*/
			abstract public function newDatapointsForObject(PhabricatorLiskDAO $object);

			final protected function getFact($key) {
			if ($this->factMap === null) {
			$facts = $this->newFacts();
			$facts = mpull($facts, null, 'getKey');
			$this->factMap = $facts;
			}

			if (!isset($this->factMap[$key])) {
			throw new Exception(
			pht(
			'Unknown fact ("%s") for engine "%s".',
			$key,
			get_class($this)));
			}

			return $this->factMap[$key];
			}

			public function setViewer(PhabricatorUser $viewer) {
			$this->viewer = $viewer;
			return $this;
			}

			public function getViewer() {
			if (!$this->viewer) {
			throw new PhutilInvalidStateException('setViewer');
			}

			return $this->viewer;
			}

			}