Hello everyone,
I used LinkAdd and LinkDelete handler in my application as follows-
@set_ev_cls(EventLinkAdd, MAIN_DISPATCHER)
    def _link_add_handler(self, ev):
@set_ev_cls(EventLinkDelete, MAIN_DISPATCHER)
    def _link_del_handler(self, ev)
Now I want to evaluate the performance of this handlers(how much time requires 
to detect). Before that I need to know actually how this handlers detect this 
events and how fast the controller knows about this events after this events 
actually happened. Ryu code is far more advanced than my python knowledge. I 
checked the following files to figure out actually how this events are detected 
by the controller -
 topology/event.pycontroller/event.pycontroller/handler.py
But unfortunately I was not able to find it. Can anyone please tell me how this 
event discovery actually works(ping or some other process!!!!)? If youthink 
that I am looking at the wrong file to figure it out please let me know where 
should I look for in the Ryu code?
Thanking youSakib

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