<?php
  
  /*
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   * This software consists of voluntary contributions made by many individuals
   * and is licensed under the MIT license. For more information, see
   * <http://www.doctrine-project.org>.
   */
  
  namespace Doctrine\Common\Cache;
  
  use \Memcached;
  
  /**
   * Memcached cache provider.
   *
   * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
   * @link    www.doctrine-project.org
   * @since   2.2
   * @author  Benjamin Eberlei <kontakt@beberlei.de>
   * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
   * @author  Jonathan Wage <jonwage@gmail.com>
   * @author  Roman Borschel <roman@code-factory.org>
   * @author  David Abdemoulaie <dave@hobodave.com>
   */
  class MemcachedCache extends CacheProvider
  {
      /**
       * @var Memcached
       */
      private $memcached;
  
      /**
       * Sets the memcache instance to use.
       *
       * @param Memcached $memcached
       */
      public function setMemcached(Memcached $memcached)
      {
          $this->memcached = $memcached;
      }
  
      /**
       * Gets the memcached instance used by the cache.
       *
       * @return Memcached
       */
      public function getMemcached()
      {
          return $this->memcached;
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doFetch($id)
      {
          return $this->memcached->get($id);
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doContains($id)
      {
          return (false !== $this->memcached->get($id));
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doSave($id, $data, $lifeTime = 0)
      {
          if ($lifeTime > 30 * 24 * 3600) {
              $lifeTime = time() + $lifeTime;
          }
          return $this->memcached->set($id, $data, (int) $lifeTime);
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doDelete($id)
      {
          return $this->memcached->delete($id);
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doFlush()
      {
          return $this->memcached->flush();
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doGetStats()
      {
          $stats   = $this->memcached->getStats();
          $servers = $this->memcached->getServerList();
          $key     = $servers[0]['host'] . ':' . $servers[0]['port'];
          $stats   = $stats[$key];
          return array(
              Cache::STATS_HITS   => $stats['get_hits'],
              Cache::STATS_MISSES => $stats['get_misses'],
              Cache::STATS_UPTIME => $stats['uptime'],
              Cache::STATS_MEMORY_USAGE       => $stats['bytes'],
              Cache::STATS_MEMORY_AVAILIABLE  => $stats['limit_maxbytes'],
          );
      }
  }