refactor the memcached class.

system/memcached.php

@@ -16,7 +16,15 @@ class Memcached {
 	 */
 	public static function instance()
 	{
-		if (is_null(static::$instance))
+		return ( ! is_null(static::$instance)) ? static::$instance : static::$instance = static::connect();
+	}
+
+	/**
+	 * Connect to the configured Memcached servers.
+	 *
+	 * @return Memcache
+	 */
+	private static function connect()
 	{
 		if ( ! class_exists('Memcache'))
 		{
@@ -35,10 +43,7 @@ class Memcached {
 			throw new \Exception('Memcached is configured. However, no connections could be made. Please verify your memcached configuration.');
 		}
 
-			static::$instance = $memcache;
-		}
-
-		return static::$instance;
+		return $memcache;
 	}
 
 }