/**
* @param null|AdapterOptions $adapterName
* @param array $options
* @throws Exception\RuntimeException
* @return Acl
*/
public static function getInstance($adapterName = null, $options = array())
{
if (static::$instance === null) {
static::$logger = Logger::getLogger(__CLASS__);
if ($adapterName instanceof AdapterInterface) {
$adapter = $adapterName;
} else {
$adapter = static::getAdapterManager()->get($adapterName);
}
if ($options) {
$adapter->setOptions($options);
}
static::$instance = new self($adapter);
} elseif ($adapterName !== null && static::$instance->getOptions()->getThrowRuntimeExceptions()) {
static::$logger->error("Acl cannot be initialized twice.");
throw new RuntimeException("Acl cannot be initialized twice.");
}
return static::$instance;
}
