interface VoterInterface
{
    const ACCESS_GRANTED = 1;
    const ACCESS_ABSTAIN = 0;
    const ACCESS_DENIED = -1;

    /**
     * Returns the vote for the given parameters.
     *
     * This method must return one of the following constants:
     * ACCESS_GRANTED, ACCESS_DENIED, or ACCESS_ABSTAIN.
     *
     * @param TokenInterface $token      A TokenInterface instance
     * @param mixed          $subject     The subject to secure
     * @param array          $attributes An array of attributes associated with the method being invoked
     *
     * @return int either ACCESS_GRANTED, ACCESS_ABSTAIN, or ACCESS_DENIED
     */
    public function vote(TokenInterface $token, $subject, array $attributes);
}