The definition of register_handler is in pycontext.cc in pyrt. It's exposed to
Python via SWIG.
-- Murphy
On Nov 2, 2011, at 10:14 PM, hzy wrote:
> 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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> nox-dev@noxrepo.org
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