Re: Annotation support

Caleb,

This is a great question! So there are two annotation/decorator scenarios
to consider:

*Clamp-specific Python decorators. *This is what you mentioned in
http://clamp.readthedocs.org/en/latest/clamp.html; they are not yet
supported in Clamp! Darjus Loktevic (cc-ed) has been playing with this
approach, so I will let him speak to any specifics in terms of what
progress he has made. However, the basic idea is that we can generate the
Java method type signatures based on these decorators, without requiring
that the Python class implements Java interface(s) and/or extends a Java
class.

In terms of implementation, presumably this should start with
ClampProxyMakerMeta as defined in clamp.declarative. This metaclass, which
has a construction inspired by SQLAlchemy, could be further refined such
that it can access any metadata that the Clamp-specific decorators record
for a class to be constructed (code that would need to be written!), then
generating appropriate type signatures via
org.python.compiler.ProxyMaker#addMethod

*Java annotations as Python decorators*. This is the idea that I describe
in some detail
https://github.com/jythontools/clamp#supporting-java-annotations
for ensuring that Python classes/methods have appropriate Java annotation
metadata.


Pull requests are certainly welcome. But perhaps even more important, we
really need to first add unit tests to Clamp, beyond some simple functional
testing provided by the Clamped companion project. (The current
implementation of Clamp started out as a very useful spike... sorry about
that!)

- Jim

On Tue, Sep 23, 2014 at 7:03 AM, Caleb P. Burns <[email protected]> wrote:

> Jython developers,
>
> How relevant are the docs for v0.1 of Clamp over at <
> http://clamp.readthedocs.org/en/latest/clamp.html>? It describes
> decorators such as `clamp.method` and `clamp.annotated`. The current
> version of Clamp (0.4) has no mention to these decorators.
>
> I am working on adding basic support for Java annotations into Clamp. At
> the moment I have annotations for classes working with a decorator
> (`clamp.annotated`). However, I am stuck on how to approach implementing
> them for Python methods. Arbitrary python methods don't get exported. And
> before one can export a python method, it needs to have a useful Java
> return type and parameter types. Is it desired to have a decorator such as
> `clamp.method` to specify its signature?
>
> Any help or advice would be greatly appreciated.
>
> Caleb Burns
>
>
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-- 
- Jim

jim.baker@{colorado.edu|python.org|rackspace.com|zyasoft.com}
twitter.com/jimbaker
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