refactor the memcached class.

system/memcached.php

@@ -16,29 +16,34 @@ class Memcached {
 	 */
 	public static function instance()
 	{
-		if (is_null(static::$instance))
-		{
-			if ( ! class_exists('Memcache'))
-			{
-				throw new \Exception('Attempting to use Memcached, but the Memcached PHP extension is not installed on this server.');
-			}
+		return ( ! is_null(static::$instance)) ? static::$instance : static::$instance = static::connect();
+	}
 
-			$memcache = new \Memcache;
+	/**
+	 * Connect to the configured Memcached servers.
+	 *
+	 * @return Memcache
+	 */
+	private static function connect()
+	{
+		if ( ! class_exists('Memcache'))
+		{
+			throw new \Exception('Attempting to use Memcached, but the Memcached PHP extension is not installed on this server.');
+		}
 
-			foreach (Config::get('cache.servers') as $server)
-			{
-				$memcache->addServer($server['host'], $server['port'], true, $server['weight']);
-			}
+		$memcache = new \Memcache;
 
-			if ($memcache->getVersion() === false)
-			{
-				throw new \Exception('Memcached is configured. However, no connections could be made. Please verify your memcached configuration.');
-			}
+		foreach (Config::get('cache.servers') as $server)
+		{
+			$memcache->addServer($server['host'], $server['port'], true, $server['weight']);
+		}
 
-			static::$instance = $memcache;
+		if ($memcache->getVersion() === false)
+		{
+			throw new \Exception('Memcached is configured. However, no connections could be made. Please verify your memcached configuration.');
 		}
 
-		return static::$instance;
+		return $memcache;
 	}
 
 }