Obtains the cache item that corresponds to node and updates the access
time.
If realtime is enabled, time is expected to be equal to or
greater than the time stored in node. If disabled and the access time is
less, the node will not be updated and null returned.
Obtains the cache item that corresponds to node and updates the access time. If realtime is enabled, time is expected to be equal to or greater than the time stored in node. If disabled and the access time is less, the node will not be updated and null returned.