Use $server->getMemCacheFactory() in ldap connection

apps/user_ldap/lib/connection.php

@@ -51,7 +51,7 @@ class Connection extends LDAPUtility {
 		$this->configPrefix = $configPrefix;
 		$this->configID = $configID;
 		$this->configuration = new Configuration($configPrefix);
-		$memcache = new \OC\Memcache\Factory();
+		$memcache = \OC::$server->getMemCacheFactory();
 		if($memcache->isAvailable()) {
 			$this->cache = $memcache->create();
 		} else {

lib/public/cachefactory.php

@@ -10,8 +10,17 @@ namespace OCP;
 
 interface CacheFactory{
 	/**
+	 * Get a memory cache instance
+	 *
 	 * @param string $prefix
 	 * @return $return \OCP\ICache
 	 */
 	public function create($prefix = '');
+
+	/**
+	 * Check if a memory cache backend is available
+	 *
+	 * @return bool
+	 */
+	public function isAvailable();
 }