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egroupware_official/phpgwapi/inc/class.egw_cache.inc.php

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<?php
/**
* EGroupware API: Caching data
*
* @link http://www.egroupware.org
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package api
* @subpackage cache
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @copyright (c) 2009-14 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @version $Id$
*/
/**
* Class to manage caching in eGroupware.
*
* It allows to cache on 4 levels:
* a) tree: for all instances/domains runining on a certain source path
* b) instance: for all sessions on a given instance
* c) session: for all requests of a session, same as egw_session::appsession()
* d) request: just for this request (same as using a static variable)
*
* There's a get, a set and a unset method for each level: eg. getTree() or setInstance(),
* as well as a variant allowing to specify the level as first parameter: eg. unsetCache()
*
* getXXX($app,$location,$callback=null,array $callback_params,$expiration=0)
* has three optional parameters allowing to specify:
* 3. a callback if requested data is not yes stored. In that case the callback is called
* and it's value is stored in the cache AND retured
* 4. parameters to pass to the callback as array, see call_user_func_array
* 5. an expiration time in seconds to specify how long data should be cached,
* default 0 means infinit (this time is not garantied and not supported for all levels!)
*
* Data is stored under an application name and a location, like egw_session::appsession().
* In fact data stored at cache level egw_cache::SESSION, is stored in the same way as
* egw_session::appsession() so both methods can be used with each other.
*
* The $app parameter should be either the app or the class name, which both are unique.
*
* The tree and instance wide cache uses a certain provider class, to store the data
* eg. in memcached or if there's nothing else configured in the filesystem (eGW's temp_dir).
*
* Apps needing to talk to multiple EGroupware instances (eg. Stylite Managementserver)
* can use install_id of instance as $level parameter to (set|get|unset)Cache method.
*/
class egw_cache
{
/**
* tree-wide storage
*/
const TREE = 'Tree';
/**
* instance-wide storage
*/
const INSTANCE = 'Instance';
/**
* session-wide storage
*/
const SESSION = 'Session';
/**
* request-wide storage
*/
const REQUEST = 'Request';
/**
* Default provider for tree and instance data
*
* Can be specified eg. in the header.inc.php by setting:
* $GLOBALS['egw_info']['server']['cache_provider_instance'] and optional
* $GLOBALS['egw_info']['server']['cache_provider_tree'] (defaults to instance)
*
* Default is set (if not set here) after class definition to egw_cache_apc or egw_cache_files,
* depending on function 'apc_fetch' exists or not
*
* @var array
*/
static $default_provider; // = array('egw_cache_files');// array('egw_cache_memcache','localhost');
/**
* Maximum expiration time, if set unlimited expiration (=0) or bigger expiration times are replaced with that time
*
* @var int
*/
static $max_expiration;
/**
* Used to determine keys for tree- and instance-level caches
*
* @var string
*/
static $egw_server_root = EGW_SERVER_ROOT;
/**
* Set some data in the cache
*
* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
* @param string $app application storing data
* @param string $location location name for data
* @param mixed $data
* @param int $expiration=0 expiration time in seconds, default 0 = never
* @return boolean true if data could be stored, false otherwise
*/
static public function setCache($level,$app,$location,$data,$expiration=0)
{
//error_log(__METHOD__."('$level','$app','$location',".array2string($data).",$expiration)");
switch($level)
{
case self::SESSION:
case self::REQUEST:
return call_user_func(array(__CLASS__,'set'.$level),$app,$location,$data,$expiration);
case self::INSTANCE:
case self::TREE:
default:
if (!($provider = self::get_provider($level)))
{
return false;
}
// limit expiration to configured maximum time
if (isset(self::$max_expiration) && (!$expiration || $expiration > self::$max_expiration))
{
$expiration = self::$max_expiration;
}
return $provider->set(self::keys($level,$app,$location),$data,$expiration);
}
throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
}
/**
* Get some data from the cache
*
* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
* @param string $app application storing data
* @param string|array $location location(s) name for data
* @param callback $callback=null callback to get/create the value, if it's not cache
* @param array $callback_params=array() array with parameters for the callback
* @param int $expiration=0 expiration time in seconds, default 0 = never
* @return mixed NULL if data not found in cache (and no callback specified) or
* if $location is an array: location => data pairs for existing location-data, non-existing is not returned
*/
static public function getCache($level,$app,$location,$callback=null,array $callback_params=array(),$expiration=0)
{
switch($level)
{
case self::SESSION:
case self::REQUEST:
foreach((array)$location as $l)
{
$data[$l] = call_user_func(array(__CLASS__,'get'.$level),$app,$l,$callback,$callback_params,$expiration);
}
return is_array($location) ? $data : $data[$l];
case self::INSTANCE:
case self::TREE:
default:
if (!($provider = self::get_provider($level)))
{
return null;
}
try {
if (is_array($location))
{
if (!is_null($callback))
{
throw new egw_exception_wrong_parameter(__METHOD__."() you can NOT use multiple locations (\$location parameter is an array) together with a callback!");
}
if (is_a($provider, 'egw_cache_provider_multiple'))
{
$data = $provider->mget($keys=self::keys($level,$app,$location));
}
else // default implementation calls get multiple times
{
$data = array();
foreach($location as $l)
{
$data[$l] = $provider->get($keys=self::keys($level,$app,$l));
if (!isset($data[$l])) unset($data[$l]);
}
}
}
else
{
$data = $provider->get($keys=self::keys($level,$app,$location));
if (is_null($data) && !is_null($callback))
{
$data = call_user_func_array($callback,$callback_params);
// limit expiration to configured maximum time
if (isset(self::$max_expiration) && (!$expiration || $expiration > self::$max_expiration))
{
$expiration = self::$max_expiration;
}
$provider->set($keys,$data,$expiration);
}
}
}
catch(Exception $e) {
$data = null;
}
return $data;
}
throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
}
/**
* Unset some data in the cache
*
* @param string $level use egw_cache::(TREE|INSTANCE|SESSION|REQUEST)
* @param string $app application storing data
* @param string $location location name for data
* @return boolean true if data was set, false if not (like isset())
*/
static public function unsetCache($level,$app,$location)
{
switch($level)
{
case self::SESSION:
case self::REQUEST:
return call_user_func(array(__CLASS__,'unset'.$level),$app,$location);
case self::INSTANCE:
case self::TREE:
default:
if (!($provider = self::get_provider($level)))
{
return false;
}
return $provider->delete(self::keys($level,$app,$location));
}
throw new egw_exception_wrong_parameter(__METHOD__."() unknown level '$level'!");
}
/**
* Set some data in the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @param mixed $data
* @param int $expiration=0 expiration time in seconds, default 0 = never
* @return boolean true if data could be stored, false otherwise
*/
static public function setTree($app,$location,$data,$expiration=0)
{
//error_log(__METHOD__."('$app','$location',".array2string($data).",$expiration)");
return self::setCache(self::TREE,$app,$location,$data,$expiration);
}
/**
* Get some data from the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @param callback $callback=null callback to get/create the value, if it's not cache
* @param array $callback_params=array() array with parameters for the callback
* @param int $expiration=0 expiration time in seconds, default 0 = never
* @return mixed NULL if data not found in cache (and no callback specified)
*/
static public function getTree($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
{
return self::getCache(self::TREE,$app,$location,$callback,$callback_params,$expiration);
}
/**
* Unset some data in the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @return boolean true if data was set, false if not (like isset())
*/
static public function unsetTree($app,$location)
{
return self::unsetCache(self::TREE,$app,$location);
}
/**
* Set some data in the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @param mixed $data
* @param int $expiration=0 expiration time in seconds, default 0 = never
* @return boolean true if data could be stored, false otherwise
*/
static public function setInstance($app,$location,$data,$expiration=0)
{
return self::setCache(self::INSTANCE,$app,$location,$data,$expiration);
}
/**
* Get some data from the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @param callback $callback=null callback to get/create the value, if it's not cache
* @param array $callback_params=array() array with parameters for the callback
* @param int $expiration=0 expiration time in seconds, default 0 = never
* @return mixed NULL if data not found in cache (and no callback specified)
*/
static public function getInstance($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
{
return self::getCache(self::INSTANCE,$app,$location,$callback,$callback_params,$expiration);
}
/**
* Unset some data in the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @return boolean true if data was set, false if not (like isset())
*/
static public function unsetInstance($app,$location)
{
return self::unsetCache(self::INSTANCE,$app,$location);
}
/**
* Set some data in the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @param mixed $data
* @param int $expiration=0 expiration time in seconds, default 0 = never
* @return boolean true if data could be stored, false otherwise
*/
static public function setSession($app,$location,$data,$expiration=0)
{
if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
{
if (egw_session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
return false; // can no longer store something in the session, eg. because commit_session() was called
}
$_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location] = $data;
return true;
}
/**
* Get some data from the cache for the whole source tree (all instances)
*
* Returns a reference to the var in the session!
*
* @param string $app application storing data
* @param string $location location name for data
* @param callback $callback=null callback to get/create the value, if it's not cache
* @param array $callback_params=array() array with parameters for the callback
* @param int $expiration=0 expiration time in seconds, default 0 = never
* @return mixed NULL if data not found in cache (and no callback specified)
*/
static public function &getSession($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
{
if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
{
if (egw_session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
return null; // can no longer store something in the session, eg. because commit_session() was called
}
if (!isset($_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location]) && !is_null($callback))
{
$_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location] = call_user_func_array($callback,$callback_params);
}
return $_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location];
}
/**
* Unset some data in the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @return boolean true if data was set, false if not (like isset())
*/
static public function unsetSession($app,$location)
{
if (isset($_SESSION[egw_session::EGW_SESSION_ENCRYPTED]))
{
if (egw_session::ERROR_LOG_DEBUG) error_log(__METHOD__.' called after session was encrypted --> ignored!');
return false; // can no longer store something in the session, eg. because commit_session() was called
}
if (!isset($_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location]))
{
return false;
}
unset($_SESSION[egw_session::EGW_APPSESSION_VAR][$app][$location]);
return true;
}
/**
* Static varible to cache request wide
*
* @var array
*/
private static $request_cache = array();
/**
* Set some data in the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @param mixed $data
* @param int $expiration=0 expiration time is NOT used for REQUEST!
* @return boolean true if data could be stored, false otherwise
*/
static public function setRequest($app,$location,$data,$expiration=0)
{
self::$request_cache[$app][$location] = $data;
return true;
}
/**
* Get some data from the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @param callback $callback=null callback to get/create the value, if it's not cache
* @param array $callback_params=array() array with parameters for the callback
* @param int $expiration=0 expiration time is NOT used for REQUEST!
* @return mixed NULL if data not found in cache (and no callback specified)
*/
static public function getRequest($app,$location,$callback=null,array $callback_params=array(),$expiration=0)
{
if (!isset(self::$request_cache[$app][$location]) && !is_null($callback))
{
self::$request_cache[$app][$location] = call_user_func_array($callback,$callback_params);
}
return self::$request_cache[$app][$location];
}
/**
* Unset some data in the cache for the whole source tree (all instances)
*
* @param string $app application storing data
* @param string $location location name for data
* @return boolean true if data was set, false if not (like isset())
*/
static public function unsetRequest($app,$location)
{
if (!isset(self::$request_cache[$app][$location]))
{
return false;
}
unset(self::$request_cache[$app][$location]);
return $ret;
}
/**
* Get a caching provider for tree or instance level
*
* The returned provider already has an opened connection
*
* @param string $level egw_cache::(TREE|INSTANCE) or install_id
* @return egw_cache_provider
*/
static protected function get_provider($level)
{
static $providers = array();
if ($level != self::TREE) $level = self::INSTANCE;
if (!isset($providers[$level]))
{
$params = $GLOBALS['egw_info']['server']['cache_provider_'.strtolower($level)];
if (!isset($params) && $level == self::INSTANCE && isset(self::$default_provider))
{
$params = self::$default_provider;
}
if (!isset($params))
{
if ($level == self::TREE) // if no tree level provider use the instance level one
{
$providers[$level] = self::get_provider(self::INSTANCE);
}
else
{
$providers[$level] = false; // no provider specified
$reason = 'no provider specified';
}
}
elseif (!$params)
{
$providers[$level] = false; // cache for $level disabled
$reason = "cache for $level disabled";
}
else
{
if (!is_array($params)) $params = (array)$params;
$class = array_shift($params);
if (!class_exists($class))
{
$providers[$level] = false; // provider class not found
$reason = "provider $class not found";
}
else
{
try
{
$providers[$level] = new $class($params);
}
catch(Exception $e)
{
$providers[$level] = false; // eg. could not open connection to backend
$reason = "error instanciating provider $class: ".$e->getMessage();
}
}
}
if (!$providers[$level]) error_log(__METHOD__."($level) no provider found ($reason)!");
}
//error_log(__METHOD__."($level) = ".array2string($providers[$level]).', cache_provider='.array2string($GLOBALS['egw_info']['server']['cache_provider_'.strtolower($level)]));
return $providers[$level];
}
/**
* Get a system configuration, even if in setup and it's not read
*
* @param string $name
* @param boolean $throw=true throw an exception, if we can't retriev the value
* @return string|boolean string with config or false if not found and !$throw
*/
static public function get_system_config($name,$throw=true)
{
if(!isset($GLOBALS['egw_info']['server'][$name]))
{
if (isset($GLOBALS['egw_setup']) && isset($GLOBALS['egw_setup']->db) || $GLOBALS['egw']->db)
{
$db = $GLOBALS['egw']->db ? $GLOBALS['egw']->db : $GLOBALS['egw_setup']->db;
if (($rs = $db->select(config::TABLE,'config_value',array(
'config_app' => 'phpgwapi',
'config_name' => $name,
),__LINE__,__FILE__)))
{
$GLOBALS['egw_info']['server'][$name] = $rs->fetchColumn();
}
else
{
error_log(__METHOD__."('name', $throw) cound NOT query value!");
}
}
if (!$GLOBALS['egw_info']['server'][$name] && $throw)
{
throw new Exception (__METHOD__."($name) \$GLOBALS['egw_info']['server']['$name'] is NOT set!");
}
}
return $GLOBALS['egw_info']['server'][$name];
}
/**
* Flush (delete) whole (instance) cache or application/class specific part of it
*
* @param $string $level=self::INSTANCE
* @param string $app=null
*/
static public function flush($level=self::INSTANCE, $app=null)
{
$ret = true;
if (!($provider = self::get_provider($level)))
{
$ret = false;
}
else
{
if (!$provider->flush(self::keys($level, $app)))
{
if ($level == self::INSTANCE)
{
self::generate_instance_key();
}
else
{
$ret = false;
}
}
}
//error_log(__METHOD__."('$level', '$app') returning ".array2string($ret));
return $ret;
}
/**
* Unset instance key, so it get read again and re-read install_id from database
*/
static public function unset_instance_key()
{
self::$instance_key = null;
$GLOBALS['egw_info']['server']['install_id'] = egw_cache::get_system_config('install_id', false);
}
/**
* Key used for instance specific data
*
* @var string
*/
private static $instance_key;
/**
* Generate a new instance key and by doing so effectivly flushes whole instance cache
*
* @param string $install_id=null default use install_id of current instance
* @return string new key also stored in self::$instance_key
*/
static public function generate_instance_key($install_id=null)
{
if (!isset($install_id))
{
self::$instance_key = null;
$install_id = self::get_system_config('install_id');
}
$instance_key = self::INSTANCE.'-'.$install_id.'-'.microtime(true);
self::setTree(__CLASS__, $install_id, $instance_key);
//error_log(__METHOD__."(install_id='$install_id') returning '".$instance_key."'");
return $instance_key;
}
/**
* Get keys array from $level, $app and $location
*
* @param string $level egw_cache::(TREE|INSTANCE) or instance_id
* @param string $app=null
* @param string $location=null
* @return array
*/
static public function keys($level, $app=null, $location=null)
{
static $tree_key = null;
switch($level)
{
case self::TREE:
if (!isset($tree_key))
{
$tree_key = $level.'-'.str_replace(array(':','/','\\'),'-', self::$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')
{
$tree_key .= '-'.$charset;
}
}
$level_key = $tree_key;
break;
default: // arbitrary install_id given --> check for current instance
if ($level !== $GLOBALS['egw_info']['server']['install_id'])
{
$level_key = self::getTree(__CLASS__, $level);
if (!isset($level_key)) $level_key = self::generate_instance_key($level);
break;
}
// fall-through for current instance
case self::INSTANCE:
if (!isset(self::$instance_key))
{
self::$instance_key = self::getTree(__CLASS__, self::get_system_config('install_id'));
//error_log(__METHOD__."('$level',...) instance_key read from tree-cache=".array2string(self::$instance_key));
if (!isset(self::$instance_key)) self::$instance_key = self::generate_instance_key();
}
$level_key = self::$instance_key;
break;
}
$keys = array($level_key);
if (isset($app))
{
$keys[] = $app;
if (isset($location)) $keys[] = $location;
}
return $keys;
}
/**
* 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!");
}
}
/**
* 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);
/**
* Delete all data under given keys
*
* Providers can return false, if they do not support flushing part of the cache (eg. memcache)
*
* @param array $keys eg. array($level,$app,$location)
* @return boolean true on success, false on error (eg. $key not set)
*/
function flush(array $keys);
}
/**
* 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_multiple
{
/**
* Get multiple data from the cache
*
* @param array $keys eg. array of array($level,$app,array $locations)
* @return array key => data stored, not found keys are NOT returned
*/
function mget(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)
{
// set us up as provider for egw_cache class
$GLOBALS['egw_info']['server']['install_id'] = md5(microtime(true));
egw_cache::$default_provider = $this;
$failed = 0;
foreach(array(
egw_cache::TREE => 'tree',
egw_cache::INSTANCE => 'instance',
) as $level => $label)
{
$locations = array();
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 (is_a($this, 'egw_cache_provider_multiple'))
{
$mget_after_set = $this->mget(array($level,__CLASS__,array($location)));
if ($mget_after_set[$location] !== $data)
{
if ($verbose) echo "$label: mget_after_set['$location']=".array2string($mget_after_set[$location])." !== ".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;
}
// prepare for mget of everything
if (is_a($this, 'egw_cache_provider_multiple'))
{
$locations[$location] = $data;
$mget_after_delete = $this->mget(array($level,__CLASS__,array($location)));
if (isset($mget_after_delete[$location]))
{
if ($verbose) echo "$label: mget_after_delete['$location']=".array2string($mget_after_delete[$location])." != NULL\n";
++$failed;
}
$this->set(array($level,__CLASS__,$location), $data, 10);
}
elseif (!is_null($data)) // emulation can NOT distinquish between null and not set
{
$locations[$location] = $data;
egw_cache::setCache($level, __CLASS__, $location, $data);
}
}
// get all above in one request
$keys = array_keys($locations);
$keys_bogus = array_merge(array('not-set'),array_keys($locations),array('not-set-too'));
if (is_a($this, 'egw_cache_provider_multiple'))
{
$mget = $this->mget(array($level,__CLASS__,$keys));
$mget_bogus = $this->mget(array($level,__CLASS__,$keys_bogus));
}
else
{
$mget = egw_cache::getCache($level, __CLASS__, $keys);
$mget_bogus = egw_cache::getCache($level, __CLASS__, $keys_bogus);
}
if ($mget !== $locations)
{
if ($verbose) echo "$label: mget=<br/>".array2string($mget)." !==<br/>".array2string($locations)."\n";
++$failed;
}
if ($mget_bogus !== $locations)
{
if ($verbose) echo "$label: mget(".array2string($keys_bogus).")=<br/>".array2string($mget_bogus)." !==<br/>".array2string($locations)."\n";
++$failed;
}
}
return $failed;
}
/**
* Delete all data under given keys
*
* Providers can return false, if they do not support flushing part of the cache (eg. memcache)
*
* @param array $keys eg. array($level,$app,$location)
* @return boolean true on success, false on error (eg. $key not set)
*/
function flush(array $keys)
{
return false;
}
}
// some testcode, if this file is called via it's URL
// can be run on command-line: sudo php -d apc.enable_cli=1 -f phpgwapi/inc/class.egw_cache.inc.php
/*if (isset($_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'),
) 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");
}
}
}*/
// setting apc as default provider, if apc_fetch function exists AND further checks in egw_cache_apc recommed it
if (is_null(egw_cache::$default_provider))
{
egw_cache::$default_provider = function_exists('apc_fetch') && egw_cache_apc::available() ? 'egw_cache_apc' : 'egw_cache_files';
}
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