On 06/01/2010 09:42 PM, Sean O'Connor wrote:
I've been generally thinking about putting together a package of
reusable tools to implement common "patterns" for reusable apps.
Included in this would be this type of auto-discovery system as well
as a registration pattern.
Auto-discovery and registration: setuptools entry points can be used for
this. That at least is an existing (partial) solution.
I'm already using it in a django project where I've got a couple of
packages that can register a render-something-on-a-map method. In the
one location where I need it I can then just ask setuptools (well,
pkg_resources) for a list of methods and call them.
Just for the idea, here's a snippet from a setup.py:
entry_points={
'lizard_map.layer_method': [
'shapefile_layer = lizard_map.layers:shapefile_layer',
]
},
And afterwards iterate through all the entry points and call them (or do
something else with them):
for entrypoint in pkg_resources.iter_entry_points(
group="lizard_map.layer_method"):
method = entrypoint.load()
method("some argument)
Some longer explanation: http://tinyurl.com/ylf3kjb
Reinout
--
Reinout van Rees - rein...@vanrees.org - http://reinout.vanrees.org
Programmer at http://www.nelen-schuurmans.nl
"Military engineers build missiles. Civil engineers build targets"
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