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Re: [osgi-technology-dev] Python <-> Java Integration via OSGi Remote Services
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Dear Colleagues,
I find this project interesting to have integrated into OSGi. We
are generally interested in extending the OSGi model to code
running outside a JVM and this goes in that direction. If we can
add contributors, even better.
Sincerely,
James
On 7/8/24 17:10, Scott Lewis via
osgi-technology-dev wrote:
On
7/8/2024 5:06 AM, Mark Hoffmann via osgi-technology-dev wrote:
Hi Scott,
thank you for this request. In general we are interested having
such a provider that allows communication between Python and
Java via Remote Services.
We already doing that as well in a custom component to trigger
ML applications, that are implemented in Python.
So, having a distribution provider would be nice.
I have seen the Py4J project made its last release in 2022. Is
there still something happening in that project?
I'm aware that the primary maintainer for many years (Barthelemy
Dagenais) stepped away from that role a couple of years ago, but
that others (Apache Spark committers, Eclipse Foundation
committers such as Jonah Graham, who is a committer on several
Eclipse projects) have taken up that maintenance mantle. In my
usage for implementing a distribution provider, I've not found any
major problems so far.
Just to get it right, the contribution would consist of Python
and Java components?
Yes. The repo I've provided has several osgi bundles, and the
primary python component (in that repo) is the osgiservicebridge,
which is available via pip.
Just to be clear, some years ago I also contributed a full
python-side RS/RSA implementation to the iPopo project.
https://ipopo.readthedocs.io/en/1.0.1/ in rsa package. This
python impl of the pelix/ipopo/RSA implementation depends upon
osgiservicebridge.
It would be great, if we could discuss
that topic, maybe in one of the next specification calls. I
would clarify that. Anyway, you are always invited to
participate these calls.
Please let me know when this is to be discussed and I'll see if I
can attend. I would prefer written questions and answers,
however...either here or some other appropriate forum.
Scott
Regards,
Mark
Am 04.07.24 um 05:45 schrieb Scott Lewis via
osgi-technology-dev:
Howdy,
For many years, the ECF project has had an implementation of
the OSGi Remote Services (100) and Remote Service Admin (122)
specifications. I believe ECF's RS/RSA impl is currently
still used in the OSGi compatibility test suite.
One of our distribution providers enables remote services
between Java and Python[1]. It uses the Py4j protocol to do
this. Py4j is an open source project [2] that is used for
Apache Spark on the server-side (I believe), Eclipse EASE
project, and other projects and products/services.
As per the OSGi Remote Services specification, a service
registry exists in both the Java and Python processes, and the
distribution provider connects them (via osgi-standardized
meta-data aka the endpoint description) to export and import
services between the two processes. [1] has all the Java and
Python components to implement this distribution provider,
along with some utilities and examples. This distribution
provider can also use Google protocol buffers as the
serialization mechanism and so it happens to work well with
the both gRPC (based upon protocol buffers) and bndtools-based
grpc tooling [3].
If there is interest and community support I would be willing
to contribute this distribution provider to the Eclipse
community, perhaps as an effort to integrate java and
python-based services and apps at the service level for a
broader 'artificial intelligence' effort at Eclipse.
Scott
[1] https://github.com/ECF/Py4j-RemoteServicesProvider/
[2] https://www.py4j.org/
[3] https://github.com/ECF/grpc-RemoteServicesProvider
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