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;
	}

	}