symfony
diff --git a/‎src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
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+201Lines changed: 201 additions & 0 deletions b/‎src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php
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+201Lines changed: 201 additions & 0 deletions
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+<?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\Cache\Adapter;
+
+use Symfony\Component\Cache\Exception\InvalidArgumentException;
+
+/**
+ * @author Rob Frawley 2nd <rmf@src.run>
+ */
+class MemcachedAdapter extends AbstractAdapter
+{
+    private static $defaultClientServer = array(
+        'host' => '127.0.0.1',
+        'port' => 11211,
+        'weight' => 100,
+    );
+
+    private $client;
+
+    public static function isSupported()
+    {
+        return extension_loaded('memcached') && version_compare(phpversion('memcached'), '2.2.0', '>=');
+    }
+
+    public function __construct(\Memcached $client, $namespace = '', $defaultLifetime = 0)
+    {
+        parent::__construct($namespace, $defaultLifetime);
+        $this->client = $client;
+    }
+
+    /**
+     * Factory method to create adapter setup with configured \Memcache client instance.
+     *
+     * Valid DSN values include the following:
+     *  - memcached://localhost                  : Specifies only the host (defaults used for port and weight)
+     *  - memcached://example.com:1234           : Specifies host and port (defaults weight)
+     *  - memcached://example.com:1234?weight=50 : Specifies host, port, and weight (no defaults used)
+     *
+     * Options are expected to be passed as an associative array with indexes of the option type with corresponding
+     * values as the option assignment. Valid options include any client constants, as described in the PHP manual:
+     *  - http://php.net/manual/en/memcached.constants.php
+     *
+     * @param string|null $dsn
+     * @param array       $opts
+     * @param string|null $persistentId
+     *
+     * @return MemcachedAdapter
+     */
+    public static function create($dsn = null, array $opts = array(), $persistentId = null)
+    {
+        $adapter = new static(new \Memcached($persistentId));
+        $adapter->setup($dsn ? array($dsn) : array(), $opts);
+
+        return $adapter;
+    }
+
+    /**
+     * @param string[] $dsns
+     * @param mixed[]  $opts
+     *
+     * @return $this
+     */
+    public function setup(array $dsns = array(), array $opts = array())
+    {
+        foreach ($opts as $opt => $val) {
+            $this->setOption($opt, $val);
+        }
+        foreach ($dsns as $dsn) {
+            $this->addServer($dsn);
+        }
+
+        return $this;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doSave(array $values, $lifetime)
+    {
+        return $this->client->setMulti($values, $lifetime)
+            && $this->client->getResultCode() === \Memcached::RES_SUCCESS;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doFetch(array $ids)
+    {
+        return $this->client->getMulti($ids);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doHave($id)
+    {
+        return $this->client->get($id) !== false
+            || $this->client->getResultCode() === \Memcached::RES_SUCCESS;
+    }
+    /**
+     * {@inheritdoc}
+     */
+    protected function doDelete(array $ids)
+    {
+        $toDelete = count($ids);
+        foreach ((array) $this->client->deleteMulti($ids) as $result) {
+            if (true === $result || \Memcached::RES_NOTFOUND === $result) {
+                --$toDelete;
+            }
+        }
+
+        return 0 === $toDelete;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function doClear($namespace)
+    {
+        if (!isset($namespace[0]) || false === $ids = $this->getIdsByPrefix($namespace)) {
+            return $this->client->flush();
+        }
+
+        $isCleared = true;
+        do {
+            $isCleared = $this->doDelete($ids) && $isCleared;
+        } while ($ids = $this->getIdsByPrefix($namespace));
+
+        return $isCleared;
+    }
+
+    private function getIdsByPrefix($namespace)
+    {
+        if (false === $ids = $this->client->getAllKeys()) {
+            return false;
+        }
+
+        return array_filter((array) $ids, function ($id) use ($namespace) {
+            return 0 === strpos($id, $namespace);
+        });
+    }
+
+    private function setOption($opt, $val)
+    {
+        return $this->client->setOption(
+            $this->resolveOption($opt),
+            $this->resolveOption($val)
+        );
+    }
+
+    private function resolveOption($val)
+    {
+        return defined($constant = '\Memcached::'.strtoupper($val)) ? constant($constant) : $val;
+    }
+
+    private function addServer($dsn)
+    {
+        list($host, $port, $weight) = $this->parseServerDSN($dsn);
+
+        return $this->isServerInClientPool($host, $port)
+            || ($this->client->addServer($host, $port, $weight)
+                && $this->client->getResultCode() === \Memcached::RES_SUCCESS);
+    }
+
+    private function parseServerDSN($dsn)
+    {
+        if (false === ($srv = parse_url($dsn)) || $srv['scheme'] !== 'memcached' || count($srv) > 4) {
+            throw new InvalidArgumentException(sprintf('Invalid Memcached DSN: %s (expected "memcached://[<string>[:<int>]][?weight=<int>]")', $dsn));
+        }
+
+        unset($srv['scheme']);
+        $srv += self::$defaultClientServer;
+
+        if (isset($srv['query']) && 1 === preg_match('{weight=([^&]{1,})}', $srv['query'], $weight)) {
+            unset($srv['query']);
+            $srv['weight'] = (int) $weight[1];
+        }
+
+        return array_values($srv);
+    }
+
+    private function isServerInClientPool($host, $port)
+    {
+        foreach ($this->client->getServerList() as $srv) {
+            if ($host === $srv['host'] && $port === $srv['port']) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}