protected function getContext($options)
{
$context = new ExecutionContext();
$context->setCredentials(array(OSSOptions::ACCESS_KEY_ID => $options[OSSOptions::ACCESS_KEY_ID], OSSOptions::ACCESS_KEY_SECRET => $options[OSSOptions::ACCESS_KEY_SECRET]));
$context->setResponseHandler($this->getResponseHandlers($options));
$bucket = isset($options[OSSOptions::BUCKET]) ? $options[OSSOptions::BUCKET] : null;
$key = isset($options[OSSOptions::KEY]) ? $options[OSSOptions::KEY] : null;
$context->setSigner(new OSSRequestSigner($bucket, $key));
$context->setParameter('Command', $this->getCommandName());
return $context;
}