jython-dev — Discussion of developing and enhancing Jython itself(!) (not how to use Jython)

Re: [Jython-dev] Natively compiled jython, take II.

[Alexandre Petit-B. <apb...@cy...>]

Finn Bock writes:

> In addition to loading of java packages from .jar files, jython also
> accept directories in the filesystem found on the CLASSPATH as java
> packages. This is why your symlink helps.

And this is where setting CLASSPATH to point to our runtime jar and
jython's jar helps. Now I can run jython from anywhere.

> I'm not at all sure how this scanning of .jar files can/should be
> done in the gcj environment. Does the rt.jar (or classes.zip) file
> still exists as a file?

Yeah, it's a file called libgcj.jar.

> The AnonInner.java source in Lib\test\javatests must be compiled
> manually. The output .class files should just be placed the same
> directory.

Noted.

> How exactly would that work? Would a foo$py.class file be dynamicly
> compiled into a foo$py.so library and loaded by the gij VM?

Well, jython's executable would use class loading features of our VM
(that most importantly for us deals with loading things in and out,
without necessarily executing bytecode.) So basically, yes. The
mechanism is exposed here:

  http://gcc.gnu.org/cgi-bin/cvsweb.cgi/~checkout~/gcc/libjava/java/lang/natClassLoader.cc?rev=1.38&content-type=text/plain

(search for quux.) Note that this is a C++ file, as we seamlessly mix
native Java and C++ code -- that's how we write the native parts of
our runtime, but we support JNI if necessary. CNI is pretty cool, you
can read more about it here: http://gcc.gnu.org/java/papers/cni/t1.html

So you can write the following:

  Foo.java:
  class Foo {}

  jld.java:
  class jld {
    public static void main (String[] arg)
    {
        Class x;
        try {x = Class.forName ("Foo");} catch (Exception _) {return;}
        java.lang.reflect.Method m[] = x.getMethods();
        for (int i = 0; i < m.length; i++)
  	  System.out.println (m[i].toString());
    }
  }

Using gcj, you create an executable from jld.java:

 $ gcj jld.java --main=jld -o jld

If you execute it now, it will do nothing.

Compile Foo.java to a class file and you'll be able to extract
informations about the class Foo:
  
  $ gcj -C Foo.java
  $ ./jld
  public final void java.lang.Object.wait(long) throws ...
  public final void java.lang.Object.wait() throws ...

Now remove the classfile and generate the matching shared object:

  $ rm Foo.class
  $ gcj -fPIC -shared Foo.java  -o lib-Foo.so

(Or we could also do gcj -fPIC -shared Foo.class -o lib-Foo.so, which
 is what I hope to hook to jython and jythonc.)

Now re-run jld, it gives the same result because it's loading the
shared object in place of the class file. You can also compile
jld.java to a class file and let our interpreter do the work by
interpreting bytecodes (but still getting info about Foo loading a
shared object:)

  $ gcj -C jld.java
  $ gij jld
  ...

Note that libgcj's interpreter (gij) naturally naturally trades
bytecodes for shared object and applies it everywhere it can, as you
could make a shared library out of jld.java and let gij load it and
execute it natively instead of interpreting the bytecode:

  $ rm jld.class
  $ gcj -fPIC -shared jld.java -o lib-jld.so
  $ gij jld
  ...

Which still is not quite like having a jld stand alone executable, but
everything is still compiled natively.

> Do you have some web links that would allow us to read about the
> enviroment that gij is running with?

You can read the documentation section of our website:

  http://gcc.gnu.org/java/docs.html

We are fairly compliant with a mixture of 1.1, 1.2 and even 1.3. It's
a clean-room implementation of the Java runtime, we're working with the
classpath project. It's known to work on {x86,ia64,ppc,alpha}/linux,
*BSD is being re-fixed one more time, Solaris should work (it used to
be our primary platform but I'm not sure the interpreter works well
anymore.) Some people have been working on a Darwin port, and there
are also numerous lesser known CPU ports being hacked on.

./A

Re: [Jython-dev] FYI and questions.

[Alexandre Petit-B. <apb...@cy...>]

Finn Bock writes:

> Generally the pystone test is not sufficiently long running to take
> advantage of the JIT compilers in later JDKs. By tuning the number
> of passes to suite JIT compiler (and using the server hotspot), we
> have seen JDK1.4 produce pystone numbers around and above
> python-1.5.2.

That's not surprising me. Gcj will lag behind a bit, as we're hardly
working on optimisations. Although natively compiling classes
generated from python code should boost performances a bit, as our VM
is really slow (we would like to add a JIT though.)

./A

Re: [Jython-dev] Natively compiled jython, take II.

[Alexandre Petit-B. <apb...@cy...>]

Samuele Pedroni writes:

> to jython rt and if there is no real jython.jar, jython is unable to
> locate the Lib dir

Good point. I built my jar file like org-jython-lag.jar (lag for
latest and greatest, we'll switch over to 2.1 when it's out.) I never
crossed my mind that jython might be looking for its own jar. Duh.

> b) Does gcj has the java.class.path property somehow set.

Yes, it's set to the content of CLASSPATH (and maybe some other
things.) So with that pointing to our libgcj.jar archive, I don't need
the `java' symlink.

> Jython rt tries to scan the jars and dirs on classpath in order
> to list the java packages that are candidate for loading. Given what
> you describe it seems that gcj classpath is empty or contain at most
> the cwd.

Yes it was. Thanks!

So, bottom line. The problem was simply that I didn't have CLASSPATH
set properly. I didn't cross my mind that a extremely dynamic
environment like jython needed pointers to the archives it was going
to explore. Duh.

So when I position CLASSPATH to point to our runtime jar and the
distributed jython jar, jython works regardless of the location it was
started from.

However, if I use the jython jar we generated with gcj (gcj can also
go to bytecodes,) I get errors, but now that's my problem :-)

Thanks a lot everyone for your help!

./A

Re: [Jython-dev] Natively compiled jython, take II.

[<bc...@wo...>]

[Alexandre Petit-Bianco]

>OK. With a bit of help from hacking our runtime and trying things out,
>I found out that if I have in my local directory all the files found
>in Lib *and* a symlink called `java' pointing to the `java' directory
>containing the class files hierarchy resulting from the build of our
>clean-room Java run time, I can run testall.py.
>
>There's something wrong with the way things are searched (if you have
>insight on where in the code this is done, it would be cool -- I just
>started to read PySystemState.java.) so I'm guessing our runtime
>doesn't setup the same environment than a regular interpreter. It also
>transpires in our VM (gij), since it runs things if the `java' symlink
>is made (no needs for local copies of the *.py in that case.)

It sound like a problem in Jython's java package loading. Java package
loading is the feature that allow jython to do a 
   import java.awt
and know that java.awt is a java package. In a normal setup jython
detects that java.awt is a java package by scanning all the .jar (and
.zip) files it can find in the classpath. Directories in the .jar files
with .class files in it is indexesd as a java package. This index is
cached in {python.home}/cachedir.

This is all implemented in the *PackageManager.java files.

In addition to loading of java packages from .jar files, jython also
accept directories in the filesystem found on the CLASSPATH as java
packages. This is why your symlink helps.

I'm not at all sure how this scanning of .jar files can/should be done
in the gcj environment. Does the rt.jar (or classes.zip) file still
exists as a file? If it is replaced by something else (maybe a rt.so
library) is there any way to query its contents?

>On the good side of things, testall reports good results. It crashed
>in serialization because of bug in our runtime error most likely. And
>then there where some other tests that I had to disable (for example,
>exit doesn't behave the same way) but otherwise it brought me fairly
>quickly to getting the same crash that I got with the install JDK
>based version (ImportError: No module named AnonInner.)

The AnonInner.java source in Lib\test\javatests must be compiled
manually. The output .class files should just be placed the same
directory.

>Soon I hope to be able to hack the hooks to run the native compiler on
>jython generated classes.

How exactly would that work? Would a foo$py.class file be dynamicly
compiled into a foo$py.so library and loaded by the gij VM?

Do you have some web links that would allow us to read about the
enviroment that gij is running with?

regards,
finn

Re: [Jython-dev] FYI and questions.

[<bc...@wo...>]

[Alexandre Petit-Bianco]

>I recently managed to compile jython natively on a linux/x86 box using
>gcj (http://gc.gnu.org/java) the Gnu native Java compiler.

Interesting!

>We're interested in including jython into our RHUG project
>(http://sources.redhat.com/rhug) 

That is an impressive list already.

>I'm also hoping to hack jythonc to
>wrap gcj so that native shared object can be generated from the class
>files jythonc emits. These shared object could be loaded by the jython
>binary to be executed instead of being interpreted (we can support
>both seamlessly.) This would yield to a working native Python
>compiler.
>
>I can build SimpleEmbedded and jython as standalone binaries, and they
>seem to run:
>
>  apbianco@venonat[~/.../jython]: ./test_SimpleEmbedded 
>  Hello, brave new world
>  sys module
>  42
>  x: 4
>  Goodbye, cruel world
>  apbianco@venonat[~/.../jython]: ./test_jython         
>  Jython 2.1a3 on java0.0.7 (JIT: null)
>  >>> print "Hello world"
>  Hello world
>  >>> ^D
>
>pystone seems to run and yields to following results:
>
>  apbianco@venonat[~/.../jython]: ./test_jython pystone.py 
>
>  Pystone(1.1) time for 10000 passes = 9.984
>  This machine benchmarks at 1001.6 pystones/second
>
>It's on a PIII/450 with 384MB of RAM. The jdk1.1.8 interpreted jython
>gave roughly 660 (a jdk1.2pre on a slightly faster machine yielded
>700), the installed python interpreter (Python 1.5.2) gave 4400.

Generally the pystone test is not sufficiently long running to take
advantage of the JIT compilers in later JDKs. By tuning the number of
passes to suite JIT compiler (and using the server hotspot), we have
seen JDK1.4 produce pystone numbers around and above python-1.5.2.

>I built the 2.1a3 and got the sources by first installing it
>somewhere. I then imported the content of the install directory where
>I wanted my sources to be and worked from there.
>
>The first successful build was based on a week old snapshot (I noted
>that while 2.1a3 had only one entry in Lib/test, the snapshot had
>several,) I then switched over 2.1a3.
>
>I got interested in running the tests in Lib/test from the snapshot
>(using the single entry point testall.py and I ran into the following
>problems:
>
>[standard modules can't be found]

In normal operations, the python.path is initialised based on the
python.home property. If python.home is not set, the classpath is
searched for a jython.jar file and that directory is used as
python.home. I would guess that you will have to set python.home in your
startup script.

>So despite the initialization of jython.path, I still can't see some
>libraries, I have to start jython right where the libraries are.
>
>And then I hit an error I don't understand. unlink is seemingly
>defined to be equivalent to remove in javaos.py. I tried to just
>re-define unlink to be like remove, it didn't help. I tried to remove
>the mention of `import unlink' in test_support.py:43, it didn't help.

The os & javaos modules are very special. The "os" isn't a python module
but a builtin java module which tries to import the javaos.py module.
That may cause errors in javaos to be silently ignored and as a result
the "os" might be empty.

regards,
finn

RE: [Jython-dev] unix command

[Phil S. <psu...@es...>]

Ideally, you could use jnios.

But this should work (I'm using NT, but there should be no difference):

>>> import java.lang
>>> p = java.lang.Runtime.getRuntime().exec('cmd /c dir')
>>> bis =
java.io.BufferedReader(java.io.InputStreamReader(p.getInputStream()))
>>> while 1:
...     line = bis.readLine()
...     if line == None:
...             break
...     print line
...
 Volume in drive D has no label.
 Volume Serial Number is 9096-175A

 Directory of
D:\projects\deviceserver\3.0.1\dist\DS3.0.1_21017_1615\server\bin

10/17/01  04:56p        <DIR>          .
10/17/01  04:56p        <DIR>          ..
10/17/01  04:32p                36,864 .ds.py.swp
10/17/01  04:32p                74,336 appscript.jar
10/17/01  04:32p               263,801 core.jar
10/17/01  04:32p                   336 device-server.properties
10/17/01  04:32p                   336 device-server_oci.properties
10/17/01  04:32p                 5,456 ds
10/17/01  04:32p                12,604 ds.py
10/17/01  04:32p                   183 log.properties
10/17/01  04:32p                   153 logwriter.properties
10/17/01  04:32p        <DIR>          MESSAGES
10/17/01  04:32p                    85 server.properties
10/17/01  04:32p                30,038 servlets.war
10/17/01  04:32p               304,246 shared.jar
10/17/01  04:32p                 3,952 startds2.cmd
10/17/01  04:32p                 4,233 startds2.sh
10/17/01  04:32p                   134 trace.properties
10/17/01  04:32p                   151 updateapps.bat
10/17/01  04:56p        <DIR>          WEB-INF
10/17/01  04:32p                 6,154 weblogic.properties
10/17/01  04:32p                 5,994 weblogic.properties.save
10/17/01  04:32p                 6,027 weblogic_oci.properties
              23 File(s)        755,083 bytes
                          1,496,104,960 bytes free
>>>

-----Original Message-----
From: Juniarti A.Suryakusuma [mailto:ju...@ma...]
Sent: Thursday, October 18, 2001 10:43 AM
To: jyt...@li...
Subject: [Jython-dev] unix command


Hi,
I have question about Jython.
How do I use Unix command, such as ls, pwd, etc on Jython interactive
mode?
Thanks.

Juni.


_______________________________________________
Jython-dev mailing list
Jyt...@li...
https://lists.sourceforge.net/lists/listinfo/jython-dev

Re: [Jython-dev] Natively compiled jython, take II.

[Samuele P. <pe...@in...>]

Hi

1. I know nothing about gcj rt.
2. I know a little about jython rt ;)

a) Unless you pass an explicit python.home property (in the sense of
System.getProperty)
to jython rt and if there is no real jython.jar, jython is unable to
locate the Lib dir
and put it in sys.path and to find the global registry. A user-specific
.jython registry
can be used as a workaround.

b) Does gcj has the java.class.path property somehow set.
   Jython rt tries to scan the jars and dirs on classpath in order to
list the java packages
  that are candidate for loading. Given what you describe it seems that
gcj classpath is
empty or contain at most the cwd. When you put the java symlink in the
cwd you enable
jython to do its scan. At the moment there is no direct workaround wrt to
gcj setting,
which - it seems - does not  implement/need a proper classpath for
classes that can be/are linked.

regards.

[Jython-dev] unix command

[Juniarti A.S. <ju...@ma...>]

Hi,
I have question about Jython.
How do I use Unix command, such as ls, pwd, etc on Jython interactive
mode?
Thanks.

Juni.

[Jython-dev] Natively compiled jython, take II.

[Alexandre Petit-B. <apb...@cy...>]

OK. With a bit of help from hacking our runtime and trying things out,
I found out that if I have in my local directory all the files found
in Lib *and* a symlink called `java' pointing to the `java' directory
containing the class files hierarchy resulting from the build of our
clean-room Java run time, I can run testall.py.

There's something wrong with the way things are searched (if you have
insight on where in the code this is done, it would be cool -- I just
started to read PySystemState.java.) so I'm guessing our runtime
doesn't setup the same environment than a regular interpreter. It also
transpires in our VM (gij), since it runs things if the `java' symlink
is made (no needs for local copies of the *.py in that case.)

On the good side of things, testall reports good results. It crashed
in serialization because of bug in our runtime error most likely. And
then there where some other tests that I had to disable (for example,
exit doesn't behave the same way) but otherwise it brought me fairly
quickly to getting the same crash that I got with the install JDK
based version (ImportError: No module named AnonInner.)

Soon I hope to be able to hack the hooks to run the native compiler on
jython generated classes.

./A

[Jython-dev] FYI and questions.

[Alexandre Petit-B. <apb...@cy...>]

I recently managed to compile jython natively on a linux/x86 box using
gcj (http://gc.gnu.org/java) the Gnu native Java compiler. We're
interested in including jython into our RHUG project
(http://sources.redhat.com/rhug) I'm also hoping to hack jythonc to
wrap gcj so that native shared object can be generated from the class
files jythonc emits. These shared object could be loaded by the jython
binary to be executed instead of being interpreted (we can support
both seamlessly.) This would yield to a working native Python
compiler.

I can build SimpleEmbedded and jython as standalone binaries, and they
seem to run:

  apbianco@venonat[~/.../jython]: ./test_SimpleEmbedded 
  Hello, brave new world
  sys module
  42
  x: 4
  Goodbye, cruel world
  apbianco@venonat[~/.../jython]: ./test_jython         
  Jython 2.1a3 on java0.0.7 (JIT: null)
  >>> print "Hello world"
  Hello world
  >>> ^D

pystone seems to run and yields to following results:

  apbianco@venonat[~/.../jython]: ./test_jython pystone.py 

  Pystone(1.1) time for 10000 passes = 9.984
  This machine benchmarks at 1001.6 pystones/second

It's on a PIII/450 with 384MB of RAM. The jdk1.1.8 interpreted jython
gave roughly 660 (a jdk1.2pre on a slightly faster machine yielded
700), the installed python interpreter (Python 1.5.2) gave 4400.

I built the 2.1a3 and got the sources by first installing it
somewhere. I then imported the content of the install directory where
I wanted my sources to be and worked from there.

The first successful build was based on a week old snapshot (I noted
that while 2.1a3 had only one entry in Lib/test, the snapshot had
several,) I then switched over 2.1a3.

I got interested in running the tests in Lib/test from the snapshot
(using the single entry point testall.py and I ran into the following
problems:

  - If I try to run the jython binary outside of Lib/, I
    get the following error:

      Testing JPython Version 2.1a3
      Traceback (innermost last):
        File "/home/apbianco/src/rhug/jython/upstream/src/Lib/test-all/testall.py", line 4, in ?
        File "/home/apbianco/src/rhug/jython/upstream/src/Lib/test/test_support.py", line 43, in ?
      ImportError: no module named javaos

    I modified my local registry to set python.path to
    /home/apbianco/src/rhug/jython/upstream/src/Lib, and debug shows that
    jython successfully reads the local registry.

  - If I try to run the jython binary inside Lib/, I get a different
    error:

      Testing JPython Version 2.1a3
      Traceback (innermost last):
        File "/home/apbianco/src/rhug/jython/upstream/src/Lib/test-all/testall.py", line 4, in ?
        File "/home/apbianco/src/rhug/jython/upstream/src/Lib/test/test_support.py", line 43, in ?
      ImportError: cannot import name unlink

So despite the initialization of jython.path, I still can't see some
libraries, I have to start jython right where the libraries are.

And then I hit an error I don't understand. unlink is seemingly
defined to be equivalent to remove in javaos.py. I tried to just
re-define unlink to be like remove, it didn't help. I tried to remove
the mention of `import unlink' in test_support.py:43, it didn't help.

There are still other mysteries to be resolved, like why the -v
command doesn't work with the natively compiled jython, but I would
appreciate if someone could give me some hints on:

  - Positioning a path to the Lib/ directory
  - What `ImportError: cannot import name unlink' could mean with
    regard to the internal jython machinery (we might have compiler or
    a runtime bug.)

Thank you.

./A

RE: [Jython-dev] questions concering Jython 2.0

[Humbel O. <Otm...@bi...>]

[ Bartel, Jan ]

> - is Jython an open source software?

> - is it possible to have a support agreement for Jython (I talk about
customer support --> e.g. using Jython together with other software
products and an error occurs.It might be possible that the error refers
to Jython. Is there the possibility to establish a support agreement
which allows to transfer calls/problem messages)?


I think it is open source, see
	http://sourceforge.net/projects/jython/ 
	http://www.jython.org/license.html

I cannot answer the question concerning a support agreement, although I
would tend to say no. On the other hand, people on the jython mailing
lists always are very helpful.


Best wishes,
Oti.

Re: [Jython-dev] atexit (was Q: how to run cleanup method wheninterpreterexits?)

[Ype K. <yk...@xs...>]

>[Ype Kingma]
>>
>> I have run into the problem that when using swing it is necessary
>> to call java.lang.System.exit() to exit the process running the
>> jython interpreter.
>
>That's always true but from my point of view it's a sensible
>behaviour wrt to the thread based vs. loop based model
>used by Java GUIs. (I know it can be annoying if one uses
>only some input dialogs for instance )
>But it's inherited from pure Java GUI code, try:
>
>import javax.swing.*;
>
>public class JB {
>
>  public static void main(String[] args) {
>    JFrame f = new JFrame();
>    f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
>    JButton b = new JButton("Ok");
>    f.getContentPane().add(b);
>    f.pack();
>    f.show();
>
>  }
>
>}
>
>or
>
>import javax.swing.*;
>
>public class JOP {
>
>  public static void main(String[] args) {
> int result = JOptionPane.showConfirmDialog(null,
> "Will an answer leave the app?", "?",
>                JOptionPane.YES_NO_OPTION);
>  }
>
>}
>
>Otherwise one would have to put some unnatural wait
>or loop in the main thread.

Which is what I have to do before calling System.exit().

Waiting for all (non deamon) java threads to die is a possibility,
but it does not feel correct to wait for non jython
threads (eg. the swing thread) in a jython implementation.

The current tactic of doing nothing leaves all the freedom
ever needed.

Regards,
Ype

[Jython-dev] questions concering Jython 2.0

[Bartel, J. <jan...@sa...>]

Dear all,
 
I have two questions about Jython:
 
- is Jython an open source software?
- is it possible to have a support agreement for Jython (I talk about
customer support --> e.g. using Jython together with other software products
and an error occurs.It might be possible that the error refers to Jython. Is
there the possibility to establish a support agreement which allows to
transfer calls/problem messages)?
 
I hope you can answer my questions,
 
best regards
 
 
Jan Bartel

RE: [Jython-dev] Q: how to run cleanup method when interpreter ex its?

[Jim A. <Ji...@do...>]

Not sure if this is what you're looking for, but it's worth a look. It's
similar to the swing demo 'console.py', but all-java:

ftp://iee.umces.edu/SME3/JConsole/SPyConsole.zip


> -----Original Message-----
> From: Matthew Cornell [mailto:co...@cs...]
> Sent: Monday, October 15, 2001 5:00 AM
> To: pe...@in...
> Cc: jyt...@li...
> Subject: Re: [Jython-dev] Q: how to run cleanup method when 
> interpreter
> exits?
> 
> 
> Thanks for the ideas. I'm sorry I wasn't clear about the scenario: We
> were investigating supporting users using our program's class while
> working in the interpreter on the command line. For example: User
> starts jython script, creates an instance of our class (prox =
> Proximity(xx)), and works with that instance (prox.foo()). The problem
> was that we needed some cleanup code to run because instatiating an
> instance of our class allocates some resources (JDBC connections,
> etc.) However, since the *interpreter* (not an application of ours) is
> in control, we were looking for hooks that would let us clean up when
> the interpreter (or VM) exits.
> 
> We've now decided that we should be in control, so I'm working on
> creating a Swing-based Jython console. I'm looking at using something
> like this:
> 
>     Py.getSystemState().stderr = new 
> PyFile(jtextAreaPrintStream, "<stderr>");
> 
> The trick is creating a JTextArea that acts like an InputStream and
> OutputStream. I've read a bunch of newsgroup posts on redirecting
> stdin and stdout, and the fullest solution seems to be a Rhino
> (JavaScript in Java) tool:
> 
>     http://www.mozilla.org/rhino/
>     
> http://lxr.mozilla.org/mozilla/source/js/rhino/toolsrc/org/moz
> illa/javascript/tools/shell/
> 
> If anyone has alread created one of these for a Jython interpreter I'd
> be grateful if you'd share the source!
> 
> Sincerely,
> 
> matt
> 
> 
> _______________________________________________
> Jython-dev mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-dev
> 

Re: [Jython-dev] atexit (was Q: how to run cleanup method wheninterpreterexits?)

[Samuele P. <pe...@in...>]

[Ype Kingma]
> 
> I have run into the problem that when using swing it is necessary
> to call java.lang.System.exit() to exit the process running the
> jython interpreter. 

That's always true but from my point of view it's a sensible
behaviour wrt to the thread based vs. loop based model
used by Java GUIs. (I know it can be annoying if one uses
only some input dialogs for instance )
But it's inherited from pure Java GUI code, try:

import javax.swing.*;

public class JB {

  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
    JButton b = new JButton("Ok");
    f.getContentPane().add(b);
    f.pack();
    f.show();

  }

}

or

import javax.swing.*;

public class JOP {

  public static void main(String[] args) {
 int result = JOptionPane.showConfirmDialog(null, 
 "Will an answer leave the app?", "?", 
                JOptionPane.YES_NO_OPTION);
  }

}

Otherwise one would have to put some unnatural wait
or loop in the main thread.

regards.

[Jython-dev] Jython code coverage testing: setline() calls

[Ype K. <yk...@xs...>]

Hello jythoneers,

I've been using pyunit for a while in jython and would like to 
have code coverage reports from some of the tests.
I started from Skip Montanaro's code coverage module
(http://musi-cal.mojam.com/~skip/python/trace.py) and found out
that the biggest hurdle probably is obtaining line numbers that have code
assigned to them. He uses the CPython parser to get actual lines
from the SETLINENO instructions in CPython byte code.
That won't work for jython, so I started piecing together a java class
file disassembler in jython to find out how it's done in jython class files.
I got to the point of disassembling individual
instructions more or less correctly, and then I found out
that setline() is called only at the beginning of each function,
which is a showstopper in this case.

There is also a line number table, but I wouldn't know how
to interpret this while the JVM is executing.

Some questions:
- Is there an option for jythonc to have setline() called for each line
  of jython code? I checked the sources a bit and even found the
  point at which the setline call is emitted for a jython function,
  but I got no further than that.
- Is line tracing implemented in jython? Function tracing works fine
  in the profiler, but line tracing is a bit more involved, and I did
  not check whether this can actually be done in jython.
- Does anyone know about a real java class file disassembler written
  in python/jython? Or one written in java that allows for visiting
  the individual instructions from a jython module so the setline arguments
  can be filtered out easily?

Regards,
Ype

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Re: [Jython-dev] Q: how to run cleanup method when interpreter exits?

[Matthew C. <co...@cs...>]

Thanks for the ideas. I'm sorry I wasn't clear about the scenario: We
were investigating supporting users using our program's class while
working in the interpreter on the command line. For example: User
starts jython script, creates an instance of our class (prox =
Proximity(xx)), and works with that instance (prox.foo()). The problem
was that we needed some cleanup code to run because instatiating an
instance of our class allocates some resources (JDBC connections,
etc.) However, since the *interpreter* (not an application of ours) is
in control, we were looking for hooks that would let us clean up when
the interpreter (or VM) exits.

We've now decided that we should be in control, so I'm working on
creating a Swing-based Jython console. I'm looking at using something
like this:

    Py.getSystemState().stderr = new PyFile(jtextAreaPrintStream, "<stderr>");

The trick is creating a JTextArea that acts like an InputStream and
OutputStream. I've read a bunch of newsgroup posts on redirecting
stdin and stdout, and the fullest solution seems to be a Rhino
(JavaScript in Java) tool:

    http://www.mozilla.org/rhino/
    http://lxr.mozilla.org/mozilla/source/js/rhino/toolsrc/org/mozilla/javascript/tools/shell/

If anyone has alread created one of these for a Jython interpreter I'd
be grateful if you'd share the source!

Sincerely,

matt

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Re: [Jython-dev] atexit (was Q: how to run cleanup method when interpreterexits?)

[Ype K. <yk...@xs...>]

Samuele,

> > Matt,
>>
>> >Hi Folks,
>> >
>> >We love Jython. We're trying to provide some functionality to our users that
>allows them to start a Jython interpreter, user our system (by instatiating a
>class), then quit. However, we need to have a cleanup method run when the
>interpreter exits. Is there a way to do this? THanks.
>>
>> In jython: use the atexit module, or use try/finally around the
>> exec or execfile() around the user code invocation.
>> In java: use try/finally around the call to the jython interpreter.
>
>Maybe I'm just very confused, but despite of the News
>jython does not support effectively atexit .

I have run into the problem that when using swing it is necessary
to call java.lang.System.exit() to exit the process running the
jython interpreter. (This was under OS2, and it seems that
swing under OS2 registers some exit hooks to the JVM that are crucial
for the well being of the GUI after the JVM exits.)
I solved it by writing a jython function calling java's exit function
and registering this jython function as the first atexit function.
It works fine, the jython exit exception is nicely caught.

I was a bit surprised that calling java.lang.System.exit()
isn't done by default (*), but then I realised that jython is an implementation
of the python language and this behaviour is not part of the language.
In Python style it could for example be done in the atexit module,
or it might be optional behaviour.

When you say "does not support effectively atexit" do you mean that
there some limitations that I did not encounter?

Thinking about it a bit more I would actually like to have java.lang.System.exit() called by default when a process based on
a jython interpreter exits. All java processes are supposed to do
this, and I cannot think of a reason why jython processes should be an
exception. If necessary, one can always call the java exit function that
does not use  the JVM's exit hooks.

Regards,
Ype

(*) in jython 21a1 iirc, i havn't checked later versions, but the
atexit module still works fine for me in 21a3.

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1618, Título Terceiro aprovado pelo "105º Congresso Base das 
Normativas Internacionais sobre o SPAM". Este E-mail não poderá
ser considerado SPAM quando incluir uma forma de ser removido.
Para ser removido de futuros correios, simplesmente responda
indicando no Assunto: REMOVER"

Re: [Jython-dev] Q: how to run cleanup method when interpreterexits?

[Samuele P. <pe...@in...>]

> Matt,
>
> >Hi Folks,
> >
> >We love Jython. We're trying to provide some functionality to our users that
allows them to start a Jython interpreter, user our system (by instatiating a
class), then quit. However, we need to have a cleanup method run when the
interpreter exits. Is there a way to do this? THanks.
>
> In jython: use the atexit module, or use try/finally around the
> exec or execfile() around the user code invocation.
> In java: use try/finally around the call to the jython interpreter.

Maybe I'm just very confused, but despite of the News
jython does not support effectively atexit .

regards.

Re: [Jython-dev] Q: how to run cleanup method when interpreter exits?

[Ype K. <yk...@xs...>]

Matt,

>Hi Folks,
>
>We love Jython. We're trying to provide some functionality to our users that allows them to start a Jython interpreter, user our system (by instatiating a class), then quit. However, we need to have a cleanup method run when the interpreter exits. Is there a way to do this? THanks.

In jython: use the atexit module, or use try/finally around the
exec or execfile() around the user code invocation.
In java: use try/finally around the call to the jython interpreter.

Have fun,
Ype

Re: [Jython-dev] Q: how to run cleanup method when interpreter exits?

[Samuele P. <pe...@in...>]

> Hi Folks,
>
> We love Jython. We're trying to provide some functionality to our users
> that allows them to start a Jython interpreter, user our system (by
> instatiating
> a class), then quit. However, we need to have a cleanup method run when
> the interpreter exits. Is there a way to do this? THanks.
>

I don't completely get your usage scenario so I'm guessing.

You can catch a SystemExit Jython (*) exception plus put cleanup code
on the normal exiting path.

Or are you asking how to cleanup an interpreter?

regards, Samuele Pedroni.

(*) try { ... } catch (org.python.core.PyException exc) {
              if (org.python.core.Py.matchException(exc,
org.python.core.Py.SystemExit))   { ... }
     }

[Jython-dev] Q: how to run cleanup method when interpreter exits?

[Matthew C. <co...@cs...>]

(re-sending this because return email address didn't get included)

Hi Folks,

We love Jython. We're trying to provide some functionality to our users
that allows them to start a Jython interpreter, user our system (by 
instatiating
a class), then quit. However, we need to have a cleanup method run when
the interpreter exits. Is there a way to do this? THanks.

matt