Hi, 

I sent a simple patch to check the possibility to add results to callbacks: 
https://review.openstack.org/#/c/201127/ 

This will allow us to decouple the callback logic from the ML2 plugin in the 
QoS scenario where we need to update the agents in case the profile_id on a 
port/network changes. 
It will also allow for a cleaner way to extend resource attributes as 
AFTER_READ callbacks can return a dict of fields to add to the original 
resource instead of mutating it directly. 

Please let me know what you think of this idea. 

Regards, 
Mike 

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