That is the trick - but I don't think it is perfect. It should find
the META_INF/services that that classloader can see - but in Eclipse
3.4 they locked it down so you could not see across different
classloaders (except for specific packages that had been made visible)
- since the check was at the package level there was no way to allow
META-INF/services a get out of jail free card. So I think it will work
for a single classloader; but not all the parent classloaders.
Specifically I think the trick get's us into the "geotools"
classloader and then hopes for the best.
You will see that some of the factory FactoryRegistry.getClassLoaders
() method has some similar logic; I think this is what we are abusing
with the setContextClassLoader method.
Jody
On 17/09/2009, at 1:24 PM, Gabriel Roldan wrote:
hey, thanks for the insight.
So, before I mess-code, let me double check. What you're saying is
that I could just do:
ClassLoader orig = Thread.currentThread().getContextClassLoader();
try{
Thread.currentThread().setContextClassLoader(<Factory class to be
looked up>.class.getClassLoader());
... do lookup ...
}finally{
Thread.currentThread().setContextClassLoader(orig);
}
and that would be it, it will even find META-INF/services?
I guess "<Factory class to be looked up>" might actually be any
class in the same jar?
Cheers,
Gabriel
Jody Garnett wrote:
We have a trick in uDig where we look up a class; find its
classloader; switch the thread to that classloader; make the call
that uses factory spi; and then restore the thead its previous
classloader.
Jody
don't have much spare time to devote to 2.5.
As a bonus, if you can switch to 2.6 I'll be happy to figure out a
way
for you to impose a classloader to the spi.
--
Gabriel Roldan
OpenGeo - http://opengeo.org
Expert service straight from the developers.
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