Re: [Jython-dev] Missing a method for resetting the PySystemState

[Indra T. <ind...@gm...>]

G'day Ivan,
I have done similar (but no longer have access to the code in question) and
used a combination of keeping track of the PySystemState associated with a
particular script and an import hook that kept track of file modification
times so that if the script changed it could be reloaded. This worked quite
well and I mentioned it in a previous email to the Jython Users list here:
http://sourceforge.net/p/jython/mailman/message/32323250/

The import hook for automatically reloading scripts was cribbed from
https://gist.github.com/aliles/2730798

Cheers
Indra

On 28 August 2015 at 22:22, Ivan Ponomarev <ipo...@ma...> wrote:

> Hello,
>
> We develop an open source project, using Jython as a script
> interpretation tool. Our application uses a pool of PythonInterpreter
> objects to facilitate multi-user work in web application.
>
> After upgrading to Jython version 2.7 we faced the following critical
> problem. In version 2.5, in order to create new PythonInterpreter each
> time we needed one more we used the following:
>
>     new PythonInterpreter(null, new PySystemState())
>
> Due to changes in version 2.7 we had to change to
>
>     new PythonInterpreter(null, Py.getSystemState())
>
> as previous method failed to work properly (random packages were
> reported as missing).
>
> Now the problem is that each time we change a Jython script file it is
> not enough to clear a pool of PythonInterpreters anymore to get things
> work the new way. We need to restart the whole Java application because
> PySystemState returned by Py.getSystemState() apparently caches the
> previous version of compiled byte code. Restarting the application takes
> up to several minutes, but we have to change the scripts 'on the fly'.
>
> If we had a proper method of resetting PySystemState it would have
> solved our problem. But we don't have one, e. g. see an open issue
> http://bugs.jython.org/issue2053. Could you comment, if you are going to
> solve the problem.  Maybe we could help you to solve it.
>
> Regards,
>
> Ivan Ponomarev, PhD
>
>
> Course-IT LLC.
>
>
>
>
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-- 
Indra Talip