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Re: [osgi-technology-dev] Python <-> Java Integration via OSGi Remote Services
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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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