what the ctxt mean?
2011/11/3 hzy <yyjianx...@gmail.com>
> 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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