Re: [Jython-users] Cleaning up PythonInterpreter object

[Joonas P. <joo...@ik...>]

Actually I was working with exactly the object factory section that you
mention. However, I think these examples are not quite production-quality
code:

*
http://jythonpodcast.hostjava.net/jythonbook/chapter10.html#one-to-one-jython-object-factoriesforces
to recreate PythonInterpreter each time a new type of Jython->Java
object is needed. The factory can only be reused for building several
objects of same type.

*
http://jythonpodcast.hostjava.net/jythonbook/chapter10.html#making-use-of-a-loosely-coupled-object-factory:
The upper listing recreates PythonInterpreter each time a new
Jython->Java
object is needed - it's doesn't even reuse the interpreter for same types of
objects (like the previous example does). The lower one (that uses
PySystemState) contains the descriptive comment: "// likely want to reuse
PySystemState in some clever fashion since expensive to setup..."

So from the doc it seems that nobody has really figured out how to actually
implement this reuse thing. Anyway, thanks for pointing out PlyJy in the
other mail, I'll have a look at it.

Best,
Joonas

2009/11/8 Josh Juneau <jun...@gm...>

> It seems that the only way to really "reset" the interpreter would be to
> recreate it as you mention.  I do agree with you that cleanup() seems that
> it should do the trick...but instead does nothing notable.
>
> Can we ask what you are doing with the interpreter?  Are object factories (
> http://jythonpodcast.hostjava.net/jythonbook/chapter10.html#object-factories)
> a solution that may work for you?  If so, they are quite easy to use and
> there is a PySystemState object factory that performs fairly well.  This may
> be something for you to look into.  You may also want to take a look at
> using JSR-223 as it may do the trick for you.
>
> Best
>
> Josh Juneau
> jun...@gm...
> http://jj-blogger.blogspot.com
> Twitter ID:  javajuneau
>
>
> On Fri, Nov 6, 2009 at 6:48 AM, Joonas Pulakka <joo...@ik...>wrote:
>
>> Hello,
>>
>> I've been told that creating a PythonInterpreter object is relatively
>> expensive, and therefore it makes sense to cache/reuse it somehow. However,
>> I'm having difficulties to "reset" the interpreter to its initial state. By
>> resetting I mean clearing all previous variables, functions and class
>> definitions. I thought interp.cleanup() would do something like that, but it
>> doesn't seem to have any effect.
>>
>> Is there a way to "reset" the interpreter, or should I just recreate it?
>>
>> Best Regards,
>> Joonas
>>
>>
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