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PhabricatorCacheEngineExtension.php
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			<?php

			abstract class PhabricatorCacheEngineExtension extends Phobject {

			final public function getExtensionKey() {
			return $this->getPhobjectClassConstant('EXTENSIONKEY');
			}

			abstract public function getExtensionName();

			public function discoverLinkedObjects(
			PhabricatorCacheEngine $engine,
			array $objects) {
			return array();
			}

			public function deleteCaches(
			PhabricatorCacheEngine $engine,
			array $objects) {
			return null;
			}

			final public static function getAllExtensions() {
			return id(new PhutilClassMapQuery())
			->setAncestorClass(__CLASS__)
			->setUniqueMethod('getExtensionKey')
			->execute();
			}

			final public function selectObjects(array $objects, $class_name) {
			$results = array();

			foreach ($objects as $phid => $object) {
			if ($object instanceof $class_name) {
			$results[$phid] = $object;
			}
			}

			return $results;
			}

			}