interface TrustedCallbackInterface

interface TrustedCallbackInterface {
    
    /**
     * Untrusted callbacks throw exceptions.
     */
    const THROW_EXCEPTION = 'exception';
    
    /**
     * Untrusted callbacks trigger E_USER_WARNING errors.
     */
    const TRIGGER_WARNING = 'warning';
    
    /**
     * Untrusted callbacks trigger silenced E_USER_DEPRECATION errors.
     */
    const TRIGGER_SILENCED_DEPRECATION = 'silenced_deprecation';
    
    /**
     * Lists the trusted callbacks provided by the implementing class.
     *
     * Trusted callbacks are public methods on the implementing class and can be
     * invoked via
     * \Drupal\Core\Security\DoTrustedCallbackTrait::doTrustedCallback().
     *
     * @return string[]
     *   List of method names implemented by the class that can be used as trusted
     *   callbacks.
     *
     * @see \Drupal\Core\Security\DoTrustedCallbackTrait::doTrustedCallback()
     */
    public static function trustedCallbacks();

}