<?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 LGPL. 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'],
        );
    }
}