<?php
/*********************************************************************************
 * SugarCRM Community Edition is a customer relationship management program developed by
 * SugarCRM, Inc. Copyright (C) 2004-2011 SugarCRM Inc.
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by the
 * Free Software Foundation with the addition of the following permission added
 * to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK
 * IN WHICH THE COPYRIGHT IS OWNED BY SUGARCRM, SUGARCRM DISCLAIMS THE WARRANTY
 * OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with
 * this program; if not, see http://www.gnu.org/licenses or write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 * 
 * You can contact SugarCRM, Inc. headquarters at 10050 North Wolfe Road,
 * SW2-130, Cupertino, CA 95014, USA. or at email address contact@sugarcrm.com.
 * 
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 * 
 * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "Powered by
 * SugarCRM" logo. If the display of the logo is not reasonably feasible for
 * technical reasons, the Appropriate Legal Notices must display the words
 * "Powered by SugarCRM".
 ********************************************************************************/


require_once('include/SugarCache/SugarCacheAbstract.php');

class SugarCacheZend extends SugarCacheAbstract
{
    /**
     * @see SugarCacheAbstract::$_priority
     */
    protected $_priority = 910;

    /**
     * @see SugarCacheAbstract::useBackend()
     */
    public function useBackend()
    {
        if ( !parent::useBackend() )
            return false;

        if ( function_exists("zend_shm_cache_fetch")
                && empty($GLOBALS['sugar_config']['external_cache_disabled_zend']))
            return true;

        return false;
    }

    /**
     * @see SugarCacheAbstract::_setExternal()
     */
    protected function _setExternal(
        $key,
        $value
        )
    {
        zend_shm_cache_store($key,serialize($value),$this->expireTimeout);
    }

    /**
     * @see SugarCacheAbstract::_getExternal()
     */
    protected function _getExternal(
        $key
        )
    {
        $raw_cache_value = zend_shm_cache_fetch($key);
        if($raw_cache_value === false) {
            return null;
        }
        return is_string($raw_cache_value) ?
            unserialize($raw_cache_value) :
            $raw_cache_value;
    }

    /**
     * @see SugarCacheAbstract::_clearExternal()
     */
    protected function _clearExternal(
        $key
        )
    {
        zend_shm_cache_delete($key);
    }

    /**
     * @see SugarCacheAbstract::_resetExternal()
     */
    protected function _resetExternal()
    {
        zend_shm_cache_clear();
    }
}