/**
* Load the session from the datastore.
*
* @param string|NULL $sessionId The ID of the session we should load, or NULL to use the default.
* @return SimpleSAML_Session|NULL The session object, or NULL if it doesn't exist.
*/
public function loadSession($sessionId = NULL)
{
assert('is_string($sessionId) || is_null($sessionId)');
if ($sessionId === NULL) {
$sessionId = $this->session_id;
}
$session = $this->store->get('session', $sessionId);
if ($session !== NULL) {
assert('$session instanceof SimpleSAML_Session');
return $session;
}
if (!$this->store instanceof SimpleSAML_Store_Memcache) {
return NULL;
}
/* For backwards compatibility, check the MemcacheStore object. */
$store = SimpleSAML_MemcacheStore::find($this->session_id);
if ($store === NULL) {
return NULL;
}
$session = $store->get('SimpleSAMLphp_SESSION');
if ($session === NULL) {
return NULL;
}
assert('is_string($session)');
$session = unserialize($session);
assert('$session instanceof SimpleSAML_Session');
return $session;
}
protected function __construct()
{
/* Call parent constructor to allow it to configure the session
* id.
*/
parent::__construct();
/* Load the session object if it already exists. */
$this->store = SimpleSAML_MemcacheStore::find($this->session_id);
if ($this->store === NULL) {
/* We didn't find the session. This may be because the
* session has expired, or it could be because this is
* a new session. In any case we create a new session.
*/
$this->store = new SimpleSAML_MemcacheStore($this->session_id);
}
}