<?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;
  
  /**
   * Xcache cache driver.
   *
   * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
   * @link    www.doctrine-project.org
   * @since   2.0
   * @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 XcacheCache extends CacheProvider
  {
      /**
       * {@inheritdoc}
       */
      protected function doFetch($id)
      {
          return $this->doContains($id) ? unserialize(xcache_get($id)) : false;
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doContains($id)
      {
          return xcache_isset($id);
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doSave($id, $data, $lifeTime = 0)
      {
          return xcache_set($id, serialize($data), (int) $lifeTime);
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doDelete($id)
      {
          return xcache_unset($id);
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doFlush()
      {
          $this->checkAuthorization();
  
          xcache_clear_cache(XC_TYPE_VAR, 0);
  
          return true;
      }
  
      /**
       * Checks that xcache.admin.enable_auth is Off
       *
       * @throws \BadMethodCallException When xcache.admin.enable_auth is On
       * @return void
       */
      protected function checkAuthorization()
      {
          if (ini_get('xcache.admin.enable_auth')) {
              throw new \BadMethodCallException('To use all features of \Doctrine\Common\Cache\XcacheCache, you must set "xcache.admin.enable_auth" to "Off" in your php.ini.');
          }
      }
  
      /**
       * {@inheritdoc}
       */
      protected function doGetStats()
      {
          $this->checkAuthorization();
  
          $info = xcache_info(XC_TYPE_VAR, 0);
          return array(
              Cache::STATS_HITS   => $info['hits'],
              Cache::STATS_MISSES => $info['misses'],
              Cache::STATS_UPTIME => null,
              Cache::STATS_MEMORY_USAGE       => $info['size'],
              Cache::STATS_MEMORY_AVAILIABLE  => $info['avail'],
          );
      }
  }