[Jython-users] Multiple PythonInterpreters; reloading modules

[Nick R. <ni...@ca...>]

I've been working on embedding Jython as a scripting language into a  
media framework (MaxMSP: http://www.cycling74.com/products/maxmsp if  
anyone is interested). It makes most sense for each JythonInterpreter  
to be independent in terms of environment and module space, but I've  
not found a way to do this: the construction of sys.path is static.  
I've looked through some messages from David Huebel about manipulating  
class loaders, but that sounds a bit messy and might well break other  
bits of the system.

My workaround at the moment is to expand sys.path for each interpreter  
instance on demand, so that each one can at least see its own module  
space on disk (as well as everyone else's), so I guess my question is:  
is the global path part of a deliberate design in Jython, or might  
this be addressed in a future release?

Question #2: is there a way to force reloading of modules if source  
files change? PythonInterpreter.execfile() will happily reload a top- 
level file, but I've not seen a way to force dependent modules to be  
reloaded if their sources have changed. (Even re-instantiating the  
interpreter doesn't help; likewise, nuking the modules' class files  
makes no difference.)

	-- N.


Nick Rothwell / Cassiel.com Limited
www.cassiel.com