egroupware/etemplate/inc/class.etemplate_request.inc.php

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<?php
/**
* eGroupWare - eTemplate request object
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker@outdoor-training.de>
* @copyright (c) 2007 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 the users session
*
* There are two ways to instanciate a request object:
*
* a) a new request:
*
* $request = new etemplate_request(); $id = $request->id();
*
* b) open or modify an existing request:
*
* if (!($request = etemplate_request::read($id)))
* {
* // request not found
* }
*
* Ajax request can use this object to open the original request by using the id, they have to transmitt back,
* and register further variables, modify the registered ones or delete them.
*/
class etemplate_request
{
/**
* here is the request data stored
*
* @var array
*/
private $data=array();
/**
* Flag if data has been modified and therefor need to be stored again in the session
*
* @var boolean
*/
private $data_modified=false;
/**
* request id
*
* @var string
*/
private $id;
/**
* Enter description here...
*
* @param array $id_data
* @return etemplate_request
*/
function __construct($id=null)
{
if (!$id) $id = $this->request_id();
$this->id = $id;
}
/**
* return the id of this request
*
* @return string
*/
function id()
{
return $this->id;
}
/**
* Read the request via it's id, returns a request_object or false
*
* @param string $id
* @return etempalte_request/boolean the object or false if $id is not found
*/
static function read($id)
{
if (!($data = $GLOBALS['egw']->session->appsession($id,'etemplate')))
{
return false; // request not found
}
$request = new etemplate_request($id);
$request->data = $data;
return $request;
}
/**
* Register a form-variable to be processed
*
* @param string $form_name form-name
* @param string $type etemplate type
* @param array $data=array() optional extra data
*/
public function set_to_process($form_name,$type,$data=array())
{
if (!$form_name || !$type) return;
$data['type'] = $type;
$this->data['to_process'][$form_name] = $data;
$this->data_modified = true;
}
/**
* Unregister a form-variable to be no longer processed
*
* @param string $form_name form-name
*/
public function unset_to_process($form_name)
{
unset($this->data['to_process'][$form_name]);
$this->data_modified = true;
}
/**
* return the data of a form-var to process or the whole array
*
* @param string $form_name=null
* @return array
*/
public function get_to_process($form_name=null)
{
return $form_name ? $this->data['to_process'][$form_name] : $this->data['to_process'];
}
/**
* check if something set for a given $form_name
*
* @param string $form_name
* @return boolean
*/
public function isset_to_process($form_name)
{
return isset($this->data['to_process'][$form_name]);
}
/**
* magic function to set all request-vars, used eg. as $request->method = 'app.class.method';
*
* @param string $var
* @param mixed $val
*/
function __set($var,$val)
{
if ($this->data[$var] !== $val)
{
$this->data[$var] = $val;
$this->data_modified = true;
}
}
/**
* magic function to access the request-vars, used eg. as $method = $request->method;
*
* @param string $var
* @return mixed
*/
function __get($var)
{
return $this->data[$var];
}
/**
* creates a new request-id via microtime()
*
* @return string
*/
function _request_id()
{
list($msec,$sec) = explode(' ',microtime());
$time = 100 * $sec + (int)(100 * $msec); // gives precision of 1/100 sec
$id = $GLOBALS['egw_info']['flags']['currentapp'] .':'. $time;
return $id;
}
/**
* saves content,readonlys,template-keys, ... via eGW's appsession function
*
* As a user may open several windows with the same content/template wie generate a location-id from microtime
* which is used as location for request to descriminate between the different windows. This location-id
* is then saved as a hidden-var in the form. The above mentions session-id has nothing to do / is different
* from the session-id which is constant for all windows opened in one session.
*/
function __destruct()
{
if ($this->data_modified) $GLOBALS['egw']->session->appsession($this->id,'etemplate',$this->data);
if (substr($GLOBALS['egw_info']['server']['sessions_type'],0,4) == 'php4' && !$this->garbage_collection_done)
{
$this->_php4_request_garbage_collection();
}
}
/**
* a little bit of garbage collection for php4 sessions (their size is limited by memory_limit)
*
* With constant eTemplate use it can grow quite big and lead to unusable sessions (php terminates
* before any output with "Allowed memory size of ... exhausted").
* We delete now sessions once used after 10min and sessions never or multiple used after 60min.
*/
private function _php4_request_garbage_collection()
{
// now we are on php4 sessions and do a bit of garbage collection
$appsessions =& $_SESSION[EGW_SESSION_VAR]['appsessions']['etemplate'];
$session_used =& $appsessions['session_used'];
if ($this->id)
{
//echo "session_used[$id_used]='".$session_used[$id_used]."'<br/>\n";
++$session_used[$this->id]; // count the number of times a session got used
}
$this->garbage_collection_done = true;
if (count($appsessions) < 20) return; // we dont need to care
list($msec,$sec) = explode(' ',microtime());
$now = 100 * $sec + (int)(100 * $msec); // gives precision of 1/100 sec
foreach(array_keys($appsessions) as $id)
{
list(,$time) = explode(':',$id);
if (!$time) continue; // other data, no session
//echo ++$n.') '.$id.': '.(($now-$time)/100.0)."secs old, used=".$session_used[$id].", size=".strlen($appsessions[$id])."<br>\n";
if ($session_used[$id] == 1 && $time < $now - 10*6000 || // session used and older then 10min
$time < $now - 60*6000) // session not used and older then 1h
{
//echo "<p>boetemplate::php4_session_garbage_collection('$id_used'): unsetting session '$id' (now=$now)</p>\n";
unset($appsessions[$id]);
unset($session_used[$id]);
}
}
}
}