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apache / celix

Apache Celix is a framework for C and C++14 to develop dynamic modular software applications using component and in-process service-oriented programming.
https://celix.apache.org/
Apache License 2.0
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Feature/599 rust hello world bundle #600

Closed pnoltes closed 1 year ago

pnoltes commented 1 year ago

This PR represents the initial step in a feasibility experiment for Rust support, as described in #599.

To be clear, I currently have no plans to introduce production-ready Rust support for Apache Celix in the short or long term. However, I am curious about its potential and am willing to spend some of my free time experimenting with possible solutions.

This current PR demonstrates that it is possible to start and stop a bundle written in Rust. I intend to gradually expand this experiment with a series of small, incremental PRs over time.

Note that currently the CELIX_RUST_EXPERIMENTAL option is default OFF and not build on CI (yet)

PengZheng commented 1 year ago

The default build produced a 200K shared object after stripping. After adding corrosion_add_target_local_rustflags(rust_bundle_activator "-Cprefer-dynamic"), a 14K shared object resulted. If we want to have classical Celix bundle written in Rust, -Cprefer-dynamic may be preferable over default static linking.

Another way of supporting Rust bundle is to add support for static bundles first(#94). It's known that CppMicroServices has such support: https://docs.cppmicroservices.org/en/stable/framework/doc/static_bundles.html IMO, static bundle is a nice-to-have feature even for C/C++ development.

pnoltes commented 1 year ago

corrosion_add_target_local_rustflags(rust_bundle_activator "-Cprefer-dynamic")

Updated. Note that the rust_bundle_activator lib now depends on the std rust lib (libstd-<some-hash>.so). Ideally the celix container is also linked against that (this is done in C++ by generating a C++ main source instead of C). But IMO for now this good enough.

pnoltes commented 1 year ago

Another way of supporting Rust bundle is to add support for static bundles first(#94). It's known that CppMicroServices has such support: https://docs.cppmicroservices.org/en/stable/framework/doc/static_bundles.html IMO, static bundle is a nice-to-have feature even for C/C++ development.

I agree. I did have a look at static bundle a while back, even with the addition of linking a resource.zip into the lib. I will update the issue #94, so that the text is more relevant.