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<?php
/**
* Base class for datastores.
*
* @package simpleSAMLphp
* @version $Id$
*/
abstract class SimpleSAML_Store {
/**
* Our singleton instance.
*
* This is FALSE if the datastore isn't enabled, and NULL
* if we haven't attempted to initialize it.
*
* @var SimpleSAML_Store|FALSE|NULL
*/
private static $instance;
/**
* Retrieve our singleton instance.
*
* @return SimpleSAML_Store|FALSE The datastore, or FALSE if it isn't enabled.
*/
public static function getInstance() {
if (self::$instance !== NULL) {
return self::$instance;
}
$config = SimpleSAML_Configuration::getInstance();
$storeType = $config->getString('store.type', NULL);
if ($storeType === NULL) {
$storeType = $config->getString('session.handler', 'phpsession');
}
switch ($storeType) {
case 'phpsession':
/* We cannot support advanced features with the PHP session store. */
self::$instance = FALSE;
break;
case 'memcache':
self::$instance = new SimpleSAML_Store_Memcache();
break;
case 'sql':
self::$instance = new SimpleSAML_Store_SQL();
break;
default:
if (strpos($storeType, ':') === FALSE) {
throw new SimpleSAML_Error_Exception('Unknown datastore type: ' . var_export($storeType, TRUE));
}
/* Datastore from module. */
$className = SimpleSAML_Module::resolveClass($storeType, 'Store', 'SimpleSAML_Store');
self::$instance = new $className();
}
return self::$instance;
}
/**
* Retrieve a value from the datastore.
*
* @param string $type The datatype.
* @param string $key The key.
* @return mixed|NULL The value.
*/
abstract public function get($type, $key);
/**
* Save a value to the datastore.
*
* @param string $type The datatype.
* @param string $key The key.
* @param mixed $value The value.
* @param int|NULL $expire The expiration time (unix timestamp), or NULL if it never expires.
*/
abstract public function set($type, $key, $value, $expire = NULL);
/**
* Delete a value from the datastore.
*
* @param string $type The datatype.
* @param string $key The key.
*/
abstract public function delete($type, $key);
}
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