mirror of
https://github.com/EGroupware/egroupware.git
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675 lines
22 KiB
PHP
675 lines
22 KiB
PHP
<?php
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/**
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* EGroupware API: Caching data
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage cache
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2009-12 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* Class to manage caching in eGroupware.
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*
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* It allows to cache on 4 levels:
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* a) tree: for all instances/domains runining on a certain source path
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* b) instance: for all sessions on a given instance
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* c) session: for all requests of a session, same as egw_session::appsession()
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* d) request: just for this request (same as using a static variable)
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*
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* There's a get, a set and a unset method for each level: eg. getTree() or setInstance(),
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* as well as a variant allowing to specify the level as first parameter: eg. unsetCache()
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*
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* getXXX($app,$location,$callback=null,array $callback_params,$expiration=0)
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* has three optional parameters allowing to specify:
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* 3. a callback if requested data is not yes stored. In that case the callback is called
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* and it's value is stored in the cache AND retured
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* 4. parameters to pass to the callback as array, see call_user_func_array
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* 5. an expiration time in seconds to specify how long data should be cached,
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* default 0 means infinit (this time is not garantied and not supported for all levels!)
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*
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* Data is stored under an application name and a location, like egw_session::appsession().
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* In fact data stored at cache level egw_cache::SESSION, is stored in the same way as
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* egw_session::appsession() so both methods can be used with each other.
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*
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* The $app parameter should be either the app or the class name, which both are unique.
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*
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* The tree and instance wide cache uses a certain provider class, to store the data
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* eg. in memcached or if there's nothing else configured in the filesystem (eGW's temp_dir).
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*/
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class egw_cache
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{
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/**
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* tree-wide storage
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*/
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const TREE = 'Tree';
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/**
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* instance-wide storage
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*/
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const INSTANCE = 'Instance';
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/**
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* session-wide storage
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*/
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const SESSION = 'Session';
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/**
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* request-wide storage
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*/
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const REQUEST = 'Request';
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/**
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* Default provider for tree and instance data
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*
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* Can be specified eg. in the header.inc.php by setting:
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* $GLOBALS['egw_info']['server']['cache_provider_instance'] and optional
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* $GLOBALS['egw_info']['server']['cache_provider_tree'] (defaults to instance)
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*
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* Default is set (if not set here) after class definition to egw_cache_apc or egw_cache_files,
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* depending on function 'apc_fetch' exists or not
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*
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* @var array
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*/
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static $default_provider; // = array('egw_cache_files');// array('egw_cache_memcache','localhost');
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/**
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* Set some data in the cache
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*
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* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration=0 expiration time in seconds, default 0 = never
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* @return boolean true if data could be stored, false otherwise
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*/
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static public function setCache($level,$app,$location,$data,$expiration=0)
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{
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//error_log(__METHOD__."('$level','$app','$location',".array2string($data).",$expiration)");
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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return call_user_func(array(__CLASS__,'set'.$level),$app,$location,$data,$expiration);
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case self::INSTANCE:
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case self::TREE:
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if (!($provider = self::get_provider($level)))
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{
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return false;
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}
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return $provider->set(self::keys($level,$app,$location),$data,$expiration);
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}
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throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
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}
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/**
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* Get some data from the cache
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*
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* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
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* @param string $app application storing data
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* @param string $location location name for data
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* @param callback $callback=null callback to get/create the value, if it's not cache
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* @param array $callback_params=array() array with parameters for the callback
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* @param int $expiration=0 expiration time in seconds, default 0 = never
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* @return mixed NULL if data not found in cache (and no callback specified)
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*/
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static public function getCache($level,$app,$location,$callback=null,array $callback_params=array(),$expiration=0)
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{
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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return call_user_func(array(__CLASS__,'get'.$level),$app,$location,$callback,$callback_params,$expiration);
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case self::INSTANCE:
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case self::TREE:
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if (!($provider = self::get_provider($level)))
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{
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return null;
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}
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try {
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$data = $provider->get($keys=self::keys($level,$app,$location));
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}
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catch(Exception $e) {
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$data = null;
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}
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if (is_null($data) && !is_null($callback))
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{
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//error_log(__METHOD__."($level,$app,$location,".array2string($callback).','.array2string($callback_params).",$expiration) calling calback to create data.");
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$data = call_user_func_array($callback,$callback_params);
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$provider->set($keys,$data,$expiration);
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}
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return $data;
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}
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throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
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}
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/**
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* Unset some data in the cache
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*
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* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
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* @param string $app application storing data
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* @param string $location location name for data
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* @return boolean true if data was set, false if not (like isset())
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*/
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static public function unsetCache($level,$app,$location)
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{
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switch($level)
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{
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case self::SESSION:
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case self::REQUEST:
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return call_user_func(array(__CLASS__,'unset'.$level),$app,$location);
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case self::INSTANCE:
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case self::TREE:
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if (!($provider = self::get_provider($level)))
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{
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return false;
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}
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return $provider->delete(self::keys($level,$app,$location));
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}
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throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
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}
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/**
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* Set some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration=0 expiration time in seconds, default 0 = never
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* @return boolean true if data could be stored, false otherwise
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*/
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static public function setTree($app,$location,$data,$expiration=0)
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{
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//error_log(__METHOD__."('$app','$location',".array2string($data).",$expiration)");
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return self::setCache(self::TREE,$app,$location,$data,$expiration);
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}
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/**
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* Get some data from the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param callback $callback=null callback to get/create the value, if it's not cache
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* @param array $callback_params=array() array with parameters for the callback
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* @param int $expiration=0 expiration time in seconds, default 0 = never
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* @return mixed NULL if data not found in cache (and no callback specified)
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*/
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static public function getTree($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
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{
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return self::getCache(self::TREE,$app,$location,$callback,$callback_params,$expiration);
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}
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/**
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* Unset some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @return boolean true if data was set, false if not (like isset())
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*/
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static public function unsetTree($app,$location)
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{
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return self::unsetCache(self::TREE,$app,$location);
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}
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/**
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* Set some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration=0 expiration time in seconds, default 0 = never
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* @return boolean true if data could be stored, false otherwise
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*/
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static public function setInstance($app,$location,$data,$expiration=0)
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{
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return self::setCache(self::INSTANCE,$app,$location,$data,$expiration);
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}
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/**
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* Get some data from the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param callback $callback=null callback to get/create the value, if it's not cache
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* @param array $callback_params=array() array with parameters for the callback
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* @param int $expiration=0 expiration time in seconds, default 0 = never
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* @return mixed NULL if data not found in cache (and no callback specified)
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*/
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static public function getInstance($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
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{
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return self::getCache(self::INSTANCE,$app,$location,$callback,$callback_params,$expiration);
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}
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/**
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* Unset some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @return boolean true if data was set, false if not (like isset())
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*/
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static public function unsetInstance($app,$location)
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{
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return self::unsetCache(self::INSTANCE,$app,$location);
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}
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/**
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* Set some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration=0 expiration time in seconds, default 0 = never
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* @return boolean true if data could be stored, false otherwise
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*/
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static public function setSession($app,$location,$data,$expiration=0)
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{
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if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
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{
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if (egw_session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
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return false; // can no longer store something in the session, eg. because commit_session() was called
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}
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$_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location] = $data;
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return true;
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}
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/**
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* Get some data from the cache for the whole source tree (all instances)
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*
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* Returns a reference to the var in the session!
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param callback $callback=null callback to get/create the value, if it's not cache
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* @param array $callback_params=array() array with parameters for the callback
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* @param int $expiration=0 expiration time in seconds, default 0 = never
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* @return mixed NULL if data not found in cache (and no callback specified)
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*/
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static public function &getSession($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
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{
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if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
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{
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if (egw_session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
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return null; // can no longer store something in the session, eg. because commit_session() was called
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}
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if (!isset($_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location]) && !is_null($callback))
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{
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$_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location] = call_user_func_array($callback,$callback_params);
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}
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return $_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location];
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}
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/**
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* Unset some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @return boolean true if data was set, false if not (like isset())
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*/
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static public function unsetSession($app,$location)
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{
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if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
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{
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if (egw_session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
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return false; // can no longer store something in the session, eg. because commit_session() was called
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}
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if (!isset($_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location]))
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{
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return false;
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}
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unset($_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location]);
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return true;
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}
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/**
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* Static varible to cache request wide
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*
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* @var array
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*/
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private static $request_cache = array();
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/**
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* Set some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param mixed $data
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* @param int $expiration=0 expiration time is NOT used for REQUEST!
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* @return boolean true if data could be stored, false otherwise
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*/
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static public function setRequest($app,$location,$data,$expiration=0)
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{
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self::$request_cache[$app][$location] = $data;
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return true;
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}
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/**
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* Get some data from the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @param callback $callback=null callback to get/create the value, if it's not cache
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* @param array $callback_params=array() array with parameters for the callback
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* @param int $expiration=0 expiration time is NOT used for REQUEST!
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* @return mixed NULL if data not found in cache (and no callback specified)
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*/
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static public function getRequest($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
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{
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if (!isset(self::$request_cache[$app][$location]) && !is_null($callback))
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{
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self::$request_cache[$app][$location] = call_user_func_array($callback,$callback_params);
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}
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return self::$request_cache[$app][$location];
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}
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/**
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* Unset some data in the cache for the whole source tree (all instances)
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*
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* @param string $app application storing data
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* @param string $location location name for data
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* @return boolean true if data was set, false if not (like isset())
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*/
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static public function unsetRequest($app,$location)
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{
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if (!isset(self::$request_cache[$app][$location]))
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{
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return false;
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}
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unset(self::$request_cache[$app][$location]);
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return $ret;
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}
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/**
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* Get a caching provider for tree or instance level
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*
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* The returned provider already has an opened connection
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*
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* @param string $level egw_cache::(TREE|INSTANCE)
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* @return egw_cache_provider
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*/
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static protected function get_provider($level)
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{
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static $providers = array();
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if (!isset($providers[$level]))
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{
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$params = $GLOBALS['egw_info']['server']['cache_provider_'.strtolower($level)];
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if (!isset($params) && $level == self::INSTANCE && isset(self::$default_provider))
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{
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$params = self::$default_provider;
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}
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if (!isset($params))
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{
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if ($level == self::TREE) // if no tree level provider use the instance level one
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{
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$providers[$level] = self::get_provider(self::INSTANCE);
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}
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else
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{
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$providers[$level] = false; // no provider specified
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$reason = 'no provider specified';
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}
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}
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elseif (!$params)
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{
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$providers[$level] = false; // cache for $level disabled
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$reason = "cache for $level disabled";
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}
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else
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{
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if (!is_array($params)) $params = (array)$params;
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$class = array_shift($params);
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if (!class_exists($class))
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{
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$providers[$level] = false; // provider class not found
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$reason = "provider $class not found";
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}
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else
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{
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try
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{
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$providers[$level] = new $class($params);
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}
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catch(Exception $e)
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{
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$providers[$level] = false; // eg. could not open connection to backend
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$reason = "error instanciating provider $class: ".$e->getMessage();
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}
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}
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}
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if (!$providers[$level]) error_log(__METHOD__."($level) no provider found ($reason)!");
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}
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//error_log(__METHOD__."($level) = ".array2string($providers[$level]).', cache_provider='.array2string($GLOBALS['egw_info']['server']['cache_provider_'.strtolower($level)]));
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return $providers[$level];
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}
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/**
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* Get a system configuration, even if in setup and it's not read
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*
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* @param string $name
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* @param boolean $throw=true throw an exception, if we can't retriev the value
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* @return string|boolean string with config or false if not found and !$throw
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*/
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static public function get_system_config($name,$throw=true)
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{
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if(!isset($GLOBALS['egw_info']['server'][$name]))
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{
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if (isset($GLOBALS['egw_setup']) && isset($GLOBALS['egw_setup']->db) || $GLOBALS['egw']->db)
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{
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$db = $GLOBALS['egw']->db ? $GLOBALS['egw']->db : $GLOBALS['egw_setup']->db;
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if (($rs = $db->select(config::TABLE,'config_value',array(
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'config_app' => 'phpgwapi',
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'config_name' => $name,
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),__LINE__,__FILE__)))
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{
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$GLOBALS['egw_info']['server'][$name] = $rs->fetchColumn();
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}
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else
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{
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error_log(__METHOD__."('name', $throw) cound NOT query value!");
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}
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}
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if (!$GLOBALS['egw_info']['server'][$name] && $throw)
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{
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throw new Exception (__METHOD__."($name) \$GLOBALS['egw_info']['server']['$name'] is NOT set!");
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}
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}
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return $GLOBALS['egw_info']['server'][$name];
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}
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/**
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|
* Get keys array from $level, $app and $location
|
|
*
|
|
* @param string $level egw_cache::(TREE|INSTANCE)
|
|
* @param string $app
|
|
* @param string $location
|
|
* @return array
|
|
*/
|
|
static public function keys($level,$app,$location)
|
|
{
|
|
static $bases = array();
|
|
|
|
if (!isset($bases[$level]))
|
|
{
|
|
switch($level)
|
|
{
|
|
case self::TREE:
|
|
$bases[$level] = $level.'-'.str_replace(array(':','/','\\'),'-',EGW_SERVER_ROOT);
|
|
// add charset to key, if not utf-8 (as everything we store depends on charset!)
|
|
if (($charset = self::get_system_config('system_charset',false)) && $charset != 'utf-8')
|
|
{
|
|
$bases[$level] .= '-'.$charset;
|
|
}
|
|
break;
|
|
case self::INSTANCE:
|
|
$bases[$level] = $level.'-'.self::get_system_config('install_id');
|
|
break;
|
|
}
|
|
}
|
|
return array($bases[$level],$app,$location);
|
|
}
|
|
|
|
/**
|
|
* Let everyone know the methods of this class should be used only statically
|
|
*
|
|
*/
|
|
function __construct()
|
|
{
|
|
throw new egw_exception_wrong_parameter("All methods of class ".__CLASS__." should be called static!");
|
|
}
|
|
}
|
|
|
|
// setting apc as default provide, if apc_fetch function exists AND not cli or apc enabled for cli
|
|
if (is_null(egw_cache::$default_provider))
|
|
{
|
|
egw_cache::$default_provider = function_exists('apc_fetch') && (PHP_SAPI != 'cli' || ini_get('apc.enable_cli')) ?
|
|
'egw_cache_apc' : 'egw_cache_files';
|
|
}
|
|
|
|
/**
|
|
* Interface for a caching provider for tree and instance level
|
|
*
|
|
* The provider can eg. create subdirs under /tmp for each key
|
|
* to store data as a file or concat them with a separator to
|
|
* get a single string key to eg. store data in memcached
|
|
*/
|
|
interface egw_cache_provider
|
|
{
|
|
/**
|
|
* Constructor, eg. opens the connection to the backend
|
|
*
|
|
* @throws Exception if connection to backend could not be established
|
|
* @param array $params eg. array(host,port) or array(directory) depending on the provider
|
|
*/
|
|
function __construct(array $params);
|
|
|
|
/**
|
|
* Stores some data in the cache
|
|
*
|
|
* @param array $keys eg. array($level,$app,$location)
|
|
* @param mixed $data
|
|
* @param int $expiration=0
|
|
* @return boolean true on success, false on error
|
|
*/
|
|
function set(array $keys,$data,$expiration=0);
|
|
|
|
/**
|
|
* Get some data from the cache
|
|
*
|
|
* @param array $keys eg. array($level,$app,$location)
|
|
* @return mixed data stored or NULL if not found in cache
|
|
*/
|
|
function get(array $keys);
|
|
|
|
/**
|
|
* Delete some data from the cache
|
|
*
|
|
* @param array $keys eg. array($level,$app,$location)
|
|
* @return boolean true on success, false on error (eg. $key not set)
|
|
*/
|
|
function delete(array $keys);
|
|
}
|
|
|
|
abstract class egw_cache_provider_check implements egw_cache_provider
|
|
{
|
|
/**
|
|
* Run several checks on a caching provider
|
|
*
|
|
* @param boolean $verbose=false true: echo failed checks
|
|
* @return int number of failed checks
|
|
*/
|
|
function check($verbose=false)
|
|
{
|
|
$failed = 0;
|
|
foreach(array(
|
|
egw_cache::TREE => 'tree',
|
|
egw_cache::INSTANCE => 'instance',
|
|
) as $level => $label)
|
|
{
|
|
foreach(array('string',123,true,false,null,array(),array(1,2,3)) as $data)
|
|
{
|
|
$location = md5(microtime(true).$label.serialize($data));
|
|
$get_before_set = $this->get(array($level,__CLASS__,$location));
|
|
if (!is_null($get_before_set))
|
|
{
|
|
if ($verbose) echo "$label: get_before_set=".array2string($get_before_set)." != NULL\n";
|
|
++$failed;
|
|
}
|
|
if (($set = $this->set(array($level,__CLASS__,$location), $data, 10)) !== true)
|
|
{
|
|
if ($verbose) echo "$label: set returned ".array2string($set)." !== TRUE\n";
|
|
++$failed;
|
|
}
|
|
$get_after_set = $this->get(array($level,__CLASS__,$location));
|
|
if ($get_after_set !== $data)
|
|
{
|
|
if ($verbose) echo "$label: get_after_set=".array2string($get_after_set)." !== ".array2string($data)."\n";
|
|
++$failed;
|
|
}
|
|
if (($delete = $this->delete(array($level,__CLASS__,$location))) !== true)
|
|
{
|
|
if ($verbose) echo "$label: delete returned ".array2string($delete)." !== TRUE\n";
|
|
++$failed;
|
|
}
|
|
$get_after_delete = $this->get(array($level,__CLASS__,$location));
|
|
if (!is_null($get_after_delete))
|
|
{
|
|
if ($verbose) echo "$label: get_after_delete=".array2string($get_after_delete)." != NULL\n";
|
|
++$failed;
|
|
}
|
|
}
|
|
}
|
|
|
|
return $failed;
|
|
}
|
|
}
|
|
|
|
// some testcode, if this file is called via it's URL
|
|
// can be run on command-line: sudo php -d apc.enable_cli=1 -f phpgwapi/inc/class.egw_cache.inc.php
|
|
/*if (isset($_SERVER['SCRIPT_FILENAME']) && realpath($_SERVER['SCRIPT_FILENAME']) == __FILE__)
|
|
{
|
|
if (!isset($_SERVER['HTTP_HOST']))
|
|
{
|
|
chdir(dirname(__FILE__)); // to enable our relative pathes to work
|
|
}
|
|
$GLOBALS['egw_info'] = array(
|
|
'flags' => array(
|
|
'noapi' => true,
|
|
),
|
|
);
|
|
include_once '../../header.inc.php';
|
|
|
|
if (isset($_SERVER['HTTP_HOST'])) echo "<pre>\n";
|
|
|
|
foreach(array(
|
|
'egw_cache_memcache' => array('localhost'),
|
|
'egw_cache_apc' => array(),
|
|
'egw_cache_files' => array('/tmp'),
|
|
'egw_cache_xcache' => array(),
|
|
) as $class => $param)
|
|
{
|
|
echo "Checking $class:\n";
|
|
try {
|
|
$start = microtime(true);
|
|
$provider = new $class($param);
|
|
$n = 100;
|
|
for($i=1; $i <= $n; ++$i)
|
|
{
|
|
$failed = $provider->check($i == 1);
|
|
}
|
|
printf("$failed checks failed, $n iterations took %5.3f sec\n\n", microtime(true)-$start);
|
|
}
|
|
catch (Exception $e) {
|
|
printf($e->getMessage()."\n\n");
|
|
}
|
|
}
|
|
}*/
|