<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def cache_file(self, local_path, ip, path):
 """ Move a file from a temporary staging area into the cache. """

        destination = self.__destination(ip, path)
        atomicish_move(local_path, destination)