Re: compile, marshal, exec

[Fernando]
> I am using pyservlet to call my own jython servlet and in here
> I would run the code above. I don't see the need for extra
> interpreters, right?

PythonInterpreter are really just thin wrappers around a PySystemState.
PySystemState is the object that varies the interpreter environment, such
as modules loaded, search paths, etc. So one Interpretet should be just
fine.

[Fernando]
> thks, I looked at it already but I don't have experience
> with java and its libraries. If I get a decently working
> solution then I could look into porting my jython servlet
> to java, but I am really not looking forward to it.
> For now I am merely seeing if there is any major roadblock.

I see no major roadblocks.

As for experience with java, you may find the java component of modjy a lot
simpler to understand than PyServlet: it does all of the key things you
need to do, but in a lot less code, and is much easier to read.

https://hg.python.org/jython/file/376c6130d9e8/src/com/xhaus/modjy/ModjyJServlet.java

[Fernando]
> The reason for 'compile' is to persist the byte code for a quicker
startup.
> Sadly, marshall in jython does not seem to be working well.

If you import your code from a module instead of exec'ing it, and the
process you're executing has write permission on the directory containing
the imported module, jython will cache the JVM bytecode for your module, to
speed up future execution.

For example, if your code is in "mymodule.py", when you "import mymodule",
the JVM bytecode will be stored in a file called "mymodule$py.class" in the
same directory.

You can see this in action by simply importing a module from the command
line interpreter.

Alan.

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