Am 13.02.2010 10:50, schrieb Florian Ludwig:
Hi,
I'm looking for a module/plugin/intra-process-communication/hook system
for python. Maybe someone here could point me to some project I missed
or might have some good ideas if I end up implementing it myself.
Most systems I have found are "one to many" communications but I would
like "many to many", to clarify what I mean an *example* use-case:
Lets say you program a wiki and like to allow different kind of
authentications. So you create two plugins (for example one for
OpenID and one for Shibboleth).
Some time later you feel like reinventing the wheel again and
you program a blog. Again you like to allow different ways of
authentication and you already wrote plugins for exactly the
same for your wiki, right?
With most systems now some trouble begins - the blog software would need
to have the interface/extention-points/however-you-name-it that the wiki
software defined.
The plugins you wrote probably import them from the wiki module directly
which means your blog would depend on the wiki. (?!) So where to put the
interface/[...] definition that is imported by those plugins? Create a
package/module just containing the interface? This really get
troublesome if different people wrote the wiki, the blog and another
third one a plugin.
If you are talking about code sharing you can move the common code out
of your applications in a seperate namespace. If you follow the model
trac is using you would install a module/package/egg with the basic
functionality of the pluginsystem (i.e. what's in core.py and env.py +
logging and whatever you think is necessary).
All shared code like your auth-plugins would go in a common plugin
directory to which you can refer via PYTHONPATH.
Another common technique is chaining of WSGI middleware..., check out
pythonpaste.org.
Then there is SOA where functionality is shared via RPC/webservices and
wsdl/uddi. But my feeling is this is mostly used in "Enterprise"
applications and is best used in Java/.NET where you already have
libraries doing all the XML stuff.
hth
Paul
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