class ChainResponsePolicy

class ChainResponsePolicy implements ChainResponsePolicyInterface {
    
    /**
     * A list of policy rules to apply when this policy is checked.
     *
     * @var \Drupal\Core\PageCache\ResponsePolicyInterface[]
     */
    protected $rules = [];
    
    /**
     * {@inheritdoc}
     */
    public function check(Response $response, Request $request) {
        foreach ($this->rules as $rule) {
            $result = $rule->check($response, $request);
            if ($result === static::DENY) {
                return $result;
            }
            elseif (isset($result)) {
                throw new \UnexpectedValueException('Return value of ResponsePolicyInterface::check() must be one of ResponsePolicyInterface::DENY or NULL');
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function addPolicy(ResponsePolicyInterface $policy) {
        $this->rules[] = $policy;
        return $this;
    }

}