the code problem I have solved after I looked the python books about
function.
but, when I look the codes in the core.py.
def register_handler(self, event_name, handler):
"""\brief Register an event handler.
The handler will be called with: handler(event).
'event' is a dictionary containing data for the
specific event.
@param event_name name of the event
@param handler handler function
"""
return self.ctxt.register_handler(event_name, handler)
I can't find the ctxt.register_handler function's definition. I want to see
how the register_handler works. which file can I find the definition?
any ideas?
2011/11/2 hzy <yyjianx...@gmail.com>
> The reason why I need to look at the code is that I want to know how does
> NOX handle the Datapath_join_event.
> I know the gen_datapath_join_callback was invoked by function
> register_for_datapath_join in core.py.
>
> I am very interested in the architecture of NOX. I am eager to know how
> the NOX works. Any information will be appreciated.
> Thanks for advance.
> hzy
>
>
> 2011/11/2 hzy <yyjianx...@gmail.com>
>
>> Hi all:
>> when I look at the code in nox/src/nox/lib/util.py written in python. I
>> was confused about some codes there. Because I am newbie to python.
>>
>> def gen_datapath_join_callback(handler):
>>> def f(event):
>>> attrs = {}
>>> attrs[core.N_BUFFERS] = event.n_buffers
>>> attrs[core.N_TABLES] = event.n_tables
>>> attrs[core.CAPABILITES] = event.capabilities
>>> attrs[core.ACTIONS] = event.actions
>>> attrs[core.PORTS] = event.ports
>>> for i in range(0, len(attrs[core.PORTS])):
>>> port = attrs[core.PORTS][i]
>>> config = port['config']
>>> state = port['state']
>>> attrs[core.PORTS][i]['link'] = (state &
>>> openflow.OFPPS_LINK_DOWN) == 0
>>> attrs[core.PORTS][i]['enabled'] = (config &
>>> openflow.OFPPC_PORT_DOWN) == 0
>>> attrs[core.PORTS][i]['flood'] = (config &
>>> openflow.OFPPC_NO_FLOOD) == 0
>>>
>>> ret = f.cb(event.datapath_id, attrs)
>>> if ret == None:
>>> return CONTINUE
>>> return ret
>>> f.cb = handler
>>> return f
>>>
>>
>> Python can define a function in a function really confused me. I do not
>> know how the function f(event) is invoked. and what the f.cb mean.
>> Any ideas?
>> Thanks forward.
>> hzy
>>
>
>
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