egroupware/etemplate/inc/class.etemplate_request_cache.inc.php

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<?php
/**
* eGroupWare - eTemplate request object storing the data in EGroupware instance cache
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker@outdoor-training.de>
* @copyright (c) 2014 by Ralf Becker <RalfBecker@outdoor-training.de>
* @version $Id$
*/
/**
* Class to represent the persitent information stored on the server for each eTemplate request
*
* The information is stored in EGroupware tree cache with a given fixed expiration time.
* We use tree cache with install-id as part of key to not loose all requests, if admin
* clears instance cache (Admin >> Clear cache and register hooks)!
*
* To enable the use of this handler, you have to set (in etemplate/inc/class.etemplate_request.inc.php):
*
* etemplate_request::$request_class = 'etemplate_request_cache';
*
* The request object should be instancated only via the factory method etemplate_request::read($id=null)
*
* $request = etemplate_request::read();
*
* // add request data
*
* $id = $request->id();
*
* b) open or modify an existing request:
*
* if (!($request = etemplate_request::read($id)))
* {
* // request not found
* }
*
* Ajax requests can use this object to open the original request by using the id, they have to transmit back,
* and register further variables, modify the registered ones or delete them AND then update the id, if it changed:
*
* if (($new_id = $request->id()) != $id)
* {
* $response->addAssign('etemplate_exec_id','value',$new_id);
* }
*
* For an example look in link_widget::ajax_search()
*/
class etemplate_request_cache extends etemplate_request
{
/**
* Expiration time of 4 hours
*/
const EXPIRATION = 14400;
/**
* request id
*
* @var string
*/
protected $id;
/**
* Private constructor to force the instancation of this class only via it's static factory method read
*
* @param string $_id
*/
private function __construct($_id=null)
{
$this->id = $_id ? $_id : self::request_id();
//error_log(__METHOD__."($_id) this->id=$this->id");
}
/**
* return the id of this request
*
* @return string
*/
public function id()
{
//error_log(__METHOD__."() id=$this->id");
return $this->id;
}
/**
* Factory method to get a new request object or the one for an existing request
*
* @param string $id=null
* @return etemplate_request|boolean the object or false if $id is not found
*/
static function read($id=null)
{
$request = new etemplate_request_cache($id);
if (!is_null($id))
{
//error_log(__METHOD__."() reading $id");
if (!($request->data = egw_cache::getTree($GLOBALS['egw_info']['server']['install_id'].'_etemplate', $id)))
{
error_log("Error reading etemplate request data for id=$id!");
return false;
}
}
//error_log(__METHOD__."(id=$id) returning ".array2string($request));
return $request;
}
/**
* creates a new unique request-id
*
* @return string
*/
static function request_id()
{
// As we replace spaces with + for those account ids which contain spaces, therefore we need to do the same for getting request id too.
$userID = str_replace(' ', '+', rawurldecode($GLOBALS['egw_info']['user']['account_lid']));
return uniqid($GLOBALS['egw_info']['flags']['currentapp'].'_'.$userID.'_',true);
}
/**
* saves content,readonlys,template-keys, ... via eGW's appsession function
*
* As a user may open several windows with the same content/template wie generate a location-id from microtime
* which is used as location for request to descriminate between the different windows. This location-id
* is then saved as a hidden-var in the form. The above mentions session-id has nothing to do / is different
* from the session-id which is constant for all windows opened in one session.
*/
function __destruct()
{
if ($this->remove_if_not_modified && !$this->data_modified && isset($this->data['last_saved']))
{
//error_log(__METHOD__."() destroying $this->id");
egw_cache::unsetTree($GLOBALS['egw_info']['server']['install_id'].'_etemplate', $this->id);
}
elseif (($this->data_modified ||
// if half of expiration time is over, save it anyway, to restart expiration time
isset($this->data['last_saved']) && (time()-$this->data['last_saved']) > self::EXPIRATION/2))
{
//error_log(__METHOD__."() saving $this->id".($this->data_modified?'':' data NOT modified, just keeping session alife'));
$this->data['last_saved'] = time();
if (!egw_cache::setTree($GLOBALS['egw_info']['server']['install_id'].'_etemplate', $this->id, $this->data, self::EXPIRATION))
{
error_log("Error storing etemplate request data for id=$this->id!");
}
}
}
}