Re: [Jython-users] NameError: name 'javamethod' is not defined

[Jim B. <jb...@zy...>]

The object factory presented here
http://kenai.com/projects/plyjy/sources/mercurial/content/src/org/plyjy/factory/PySystemObjectFactory.java?rev=2
is quite usable. However, Tobias and I discussed this further, and we do
need to refine it further (use a static factory method instead of a public
constructor, genericize, change its over lengthy name, cache a private
instance of PySystemState).

If we can stabilize this API soon, it could be included for the forthcoming
2.5.1 release.

- Jim

On Tue, Jul 21, 2009 at 5:57 AM, Tobias Ivarsson <th...@gm...> wrote:

> Gabriel,
>
> I would rather say that there currently is no way of defining interfaces
> for Java code from Jython. You can still use Python code from Java, you just
> need to define the interfaces (or base classes) in Java and provide the
> implementation in Python. The object factory pattern is very useful for
> accessing these implementations from Java.
>
> Jim Baker and Josh Juneau have a library over at Kenai that makes Jython
> object factories as easy as "new JythonObjectFactory(...);" (or something
> like that): http://kenai.com/projects/plyjy, I don't know if this is
> production ready yet, but you can at least look at their code to find out
> how to implement an object factory, it's less than a page of code (I've
> included the code in presentation slides from time to time).
>
> So, a summary of the best way to use Python code from Java at the moment:
>
> 1. Define the interface(s) for the Python code in Java:
>     package com.pany.package;
>     public interface MyCodeThingy {
>           String someMethod(int value);
>     }
>
> 2. Implement the interface(s) in Python:
>     from com.pany.package import MyCodeThingy
>     class MyImplementation(MyCodeThingy):
>         def __init__(self, prefix):
>             self.prefix = prefix
>         def someMethod(self, value):
>             return "%s - %s" % (self.prefix, value) # Really advanced code
> - you could NEVER do this in Java
>
> 3. Instantiate an object factory for the Python code in Java:
>     ObjectFactory<MyCodeThingy> codeThingyFactory = new
> JythonObjectFactory<>(...); // Not sure about the actual interface here
>
> 4. Use the object factory to create instances of your Python class in Java:
>     String prefix = "The answer to the question about life, universe and
> everything";
>     MyCodeThingy thing = codeThingyFactory.create(prefix);
>     String result = thingy.someMethod(42);
>     assert result.equals("The answer to the question about life, universe
> and everything - 42");
>
> Jim, Josh - How close to being usable like this example is PlyJy at the
> moment?
>
> Happy hacking,
> Tobias
>
>
> On Tue, Jul 21, 2009 at 12:53 PM, Gabriel Rossetti <
> gab...@ar...> wrote:
>
>> Hello Tobias,
>>
>> So if I understand it correctly there is currently no way to use python
>> code in Java (since jythonc is gone and the current proposal not being
>> implemented)?
>>
>> Cheers,
>> Gabriel
>>
>> Tobias Ivarsson wrote:
>>
>>> Hi Gabriel,
>>>
>>> These are not examples of how to do it in the current Jython 2.5 release,
>>> but a suggestion for what this could could look like when the Jythonc
>>> replacement is done. The Jythonc replacement is still in an early draft
>>> stage and will likely be tentatively introduced in some 2.5.x release, we
>>> had originally planned to introduce a first version for people to play with
>>> in 2.5.1, but it is starting to look like we will have to push out 2.5.1
>>> earlier than planned due to some recent bug fixes.
>>>
>>> Cheers,
>>> Tobias
>>>
>>> On Tue, Jul 21, 2009 at 11:06 AM, Gabriel Rossetti <
>>> gab...@ar... <mailto:gab...@ar...>> wrote:
>>>
>>>    Hello everyone,
>>>
>>>    I instaled Jython 2.5 and tried the example on this page :
>>>    http://wiki.python.org/jython/ReplaceJythonc and it doesn't work,
>>>    I get :
>>>
>>>    NameError: name 'javamethod' is not defined
>>>
>>>    does anyone know how to fix this, I can't find much concerning this on
>>>    google.
>>>
>>>    Thank you,
>>>    Gabriel
>>>
>>>
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-- 
Jim Baker
jb...@zy...