/**
* The constructor initializes the session and sends the session headers
* The session will be based on the given session handler. The session handler can be overridden by setting the SESSION_HANDLER definition.
* Do note: if a handler fails to initialize, it will default to the DEFAULT_HANDLER.
*/
public final function __construct()
{
if (!self::$headersSend) {
//apply the session handler directive to our system
if (!defined('SESSION_HANDLER')) {
throw new \System\Error\Exception\SystemException('Invalid session handler given. Set to HANDLER_FILES; HANDLER_MEMCACHE; or a SessionHandler class');
}
self::$currentHandler = SESSION_HANDLER;
switch (self::$currentHandler) {
case SessionHandler::HANDLER_MEMCACHE:
//initialize memcache and establish a connection. This makes sure the MEMCACHE_* settings are defined and correct.
$memcache = new \System\Cache\Memcache\Memcache();
//if we are not connected, we do a fallthrough to regular files.
if ($memcache->isConnected()) {
ini_set('session.save_handler', 'memcache');
$hosts = $ports = array();
\System\Cache\Memcache\Memcache::getServers($hosts, $ports);
$connectArray = array();
foreach ($hosts as $index => $host) {
$connectArray[] = 'tcp://' . $host . ':' . $ports[$index];
}
//the save path expects something like 'tcp://IP:PORT'
ini_set('session.save_path', implode(',', $connectArray));
break;
}
//we do a fallthrough if the memcache is not connected and revert to files
self::$currentHandler = SessionHandler::HANDLER_FILES;
case SessionHandler::HANDLER_FILES:
if (session_save_path() == '') {
session_save_path(PATH_TEMP);
//we use the temporary folder for this.
}
break;
default:
if (class_exists(self::$currentHandler) && in_array('SessionHandlerInterface', class_implements(self::$currentHandler, true))) {
self::$customHandler = new self::$currentHandler();
session_set_save_handler(self::$customHandler, true);
} else {
throw new \System\Error\Exception\SystemException('Invalid session handler given: ' . self::$currentHandler);
}
}
//this implicitly sends a few headers
session_cache_limiter('nocache');
session_cache_expire(180);
//this is the default, but we set it explicitly
session_name(SITE_IDENTIFIER . '_session');
session_start();
//we should only set our headers once
self::$headersSend = true;
}
}
