Update the object cache with given attributes.
If an attribute already exists in the cache, it will be updated, and if it doesn't it will be added.
This call will return immediately and complete asynchronously.
| this |
the object with the cache |
| attr_types |
the types of attributes to update |
| cancellable |
optional cancellation object |
| callback |
called when the operation completes |
| n_attr_types |
the number of attribute types |
| user_data |
data to be passed to the callback |