Hi!
Locklainn wrote:
So, I just committed my UDP message template code (the parser, reader,
builder/serializer). It should be usable for creating and decoding UDP
template messages. Now we just have to write the message system that
will use such things.
WOOT! :-)
Also note that we need a TCP reader/writer for the event queue stuff and
that the previous code doesn't use ZCA. Will have to zca-ify it now that
we have decided to go with it.
We can discuss maybe where it makes sense to do so. I don't think we
have to compononentize it just for the fun of it ;-)
But of course it would be cool if you could define the public interfaces
for these classes and put those in message/interfaces.py so it can serve
as documentation.
Tao,
how exactly does one use your network layer? For instance, how do we
choose which IRESTClient to use? In your test you are just doing
getUtility(IRESTClient), but how do I know if I get urllib2, eventlet,
mock, etc?
I think we solved this yesterday. What we both did now was to do
provideUtility(StdLibClient(), IRESTClient)
which tells the framework to use the StdLibClient instance if asked for
an IRESTClient utility. This is not completely correct what we do here
though as such an override should happen more explicit (in this case
it's the default anyway and there should not need to be any overriding
needed and the default should be documented). I will document how to do
it propertly (and change it accordingly) soon. For now this should work.
(The problem here btw would be what should happen if another component
overrides this as well. Then you wouldn't know what is active. For this
the configuration machinery with ZCML has some mechanisms in place to
mark overrides so that when the configuration takes place first the
normal registrations are done and then the overrides. Before that is
done it also checks for conflicts and raises an exception if there is one.)
We should maybe think if there is a use case where you have different
instance of the library with different network layers in one
application. Somehow I doubt it but if there would be such a use case
(or for some other component) then we should think about a general
pattern of how to solve this. So maybe we need some configuration object
for the library with which you initialize the components. But I guess it
would need to be passed at least to the initial agent domain, which then
can pass it along to whatever is instantiated from it.
I guess that might make sense for some tests.
-- Christian
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