Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/http-foundation/Session/Storage/Handler/MemcacheSessionHandler.php

@@ -0,0 +1,119 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
+
+/**
+ * MemcacheSessionHandler.
+ *
+ * @author Drak <drak@zikula.org>
+ */
+class MemcacheSessionHandler implements \SessionHandlerInterface
+{
+    /**
+     * @var \Memcache Memcache driver.
+     */
+    private $memcache;
+
+    /**
+     * @var int Time to live in seconds
+     */
+    private $ttl;
+
+    /**
+     * @var string Key prefix for shared environments.
+     */
+    private $prefix;
+
+    /**
+     * Constructor.
+     *
+     * List of available options:
+     *  * prefix: The prefix to use for the memcache keys in order to avoid collision
+     *  * expiretime: The time to live in seconds
+     *
+     * @param \Memcache $memcache A \Memcache instance
+     * @param array     $options  An associative array of Memcache options
+     *
+     * @throws \InvalidArgumentException When unsupported options are passed
+     */
+    public function __construct(\Memcache $memcache, array $options = array())
+    {
+        if ($diff = array_diff(array_keys($options), array('prefix', 'expiretime'))) {
+            throw new \InvalidArgumentException(sprintf(
+                'The following options are not supported "%s"', implode(', ', $diff)
+            ));
+        }
+
+        $this->memcache = $memcache;
+        $this->ttl = isset($options['expiretime']) ? (int) $options['expiretime'] : 86400;
+        $this->prefix = isset($options['prefix']) ? $options['prefix'] : 'sf2s';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function open($savePath, $sessionName)
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function close()
+    {
+        return $this->memcache->close();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function read($sessionId)
+    {
+        return $this->memcache->get($this->prefix.$sessionId) ?: '';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function write($sessionId, $data)
+    {
+        return $this->memcache->set($this->prefix.$sessionId, $data, 0, time() + $this->ttl);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function destroy($sessionId)
+    {
+        return $this->memcache->delete($this->prefix.$sessionId);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function gc($maxlifetime)
+    {
+        // not required here because memcache will auto expire the records anyhow.
+        return true;
+    }
+
+    /**
+     * Return a Memcache instance.
+     *
+     * @return \Memcache
+     */
+    protected function getMemcache()
+    {
+        return $this->memcache;
+    }
+}