caching load previous session user

Hello,

Thank you for such a wonderful module.

I am facing a problem, i created a web service API of action type in hook_services_resources() and in access callback of api it accept current user variable (global $user) as argument in services_get_resources() function in module file, it cache all API resources due to which $user (current user) also get cache and when another user run same api, module load resources from cache and load cache user instead of new current user due to which it behave unexpected.