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<?php
/*********************************************************************************
* SugarCRM Community Edition is a customer relationship management program developed by
* SugarCRM, Inc. Copyright (C) 2004-2012 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 SugarCacheFile extends SugarCacheAbstract
{
/**
* @var path and file which will store the cache used for this backend
*/
protected $_cacheFileName = 'externalCache.php';
/**
* @var bool true if the cache has changed and needs written to disk
*/
protected $_cacheChanged = false;
/**
* @see SugarCacheAbstract::$_priority
*/
protected $_priority = 990;
/**
* @see SugarCacheAbstract::useBackend()
*/
public function useBackend()
{
if ( !parent::useBackend() )
return false;
if ( !empty($GLOBALS['sugar_config']['external_cache_enabled_file']) )
return true;
return false;
}
/**
* @see SugarCacheAbstract::__construct()
*
* For this backend, we'll read from the SugarCacheFile::_cacheFileName file into
* the SugarCacheFile::$localCache array.
*/
public function __construct()
{
parent::__construct();
if ( isset($GLOBALS['sugar_config']['external_cache_filename']) )
$this->_cacheFileName = $GLOBALS['sugar_config']['external_cache_filename'];
}
/**
* @see SugarCacheAbstract::__destruct()
*
* For this backend, we'll write the SugarCacheFile::$localCache array serialized out to a file
*/
public function __destruct()
{
parent::__destruct();
if ( $this->_cacheChanged )
sugar_file_put_contents(sugar_cached($this->_cacheFileName), serialize($this->_localStore));
}
/**
* This is needed to prevent unserialize vulnerability
*/
public function __wakeup()
{
// clean all properties
foreach(get_object_vars($this) as $k => $v) {
$this->$k = null;
}
throw new Exception("Not a serializable object");
}
/**
* @see SugarCacheAbstract::_setExternal()
*
* Does nothing; we write to cache on destroy
*/
protected function _setExternal(
$key,
$value
)
{
$this->_cacheChanged = true;
}
/**
* @see SugarCacheAbstract::_getExternal()
*/
protected function _getExternal(
$key
)
{
// load up the external cache file
if ( sugar_is_file($cachedfile = sugar_cached($this->_cacheFileName)))
$this->localCache = unserialize(file_get_contents($cachedfile));
if ( isset($this->_localStore[$key]) )
return $this->_localStore[$key];
return null;
}
/**
* @see SugarCacheAbstract::_clearExternal()
*
* Does nothing; we write to cache on destroy
*/
protected function _clearExternal(
$key
)
{
$this->_cacheChanged = true;
}
/**
* @see SugarCacheAbstract::_resetExternal()
*
* Does nothing; we write to cache on destroy
*/
protected function _resetExternal()
{
$this->_cacheChanged = true;
}
}
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