Are separate Service files in java extensions unofficially deprecated?

Detlef_R · May 17, 2014, 3:23pm

I have successfully created some java extensions for ruby-processing,
based on yokolets Fraction class tutorial (which is very clear), however
I was concerned that Headius was now pointing to a different model by
James C. as being best example to follow, which does away with the
separate service file. It took me a bit longer to get my head around
James example, and I have now converted both my ArcBall and DegLut
extension to that model
https://github.com/ruby-processing/RVecMath/wiki/ArcBall-functionality.
My question is what is the benefit of the new model, is the old form
deprecated (I still see examples out there). Should I convert my other
classes, might they be useful templates for others
https://github.com/ruby-processing/RVecMath/wiki/Creating-native-extensions-for-ruby-in-java

dhstudio · May 18, 2014, 9:17pm

Finally I found it again, here is where Charlie mentions the unofficial
deprecation of the “service” model of getting code to load.

github.com/jruby/jruby

Create a sample project and wiki pages on how to write JRuby extensions

opened 09:20PM - 24 Jun 13 UTC

closed 07:35PM - 11 May 16 UTC

headius

We really should have a better set of examples and documents for how to write a …JRuby extension. Many folks could be creating high-performance extensions to JRuby if this information were available. The most recent article on writing an extension appears to be one from @jcoglan: http://blog.jcoglan.com/2012/08/02/your-first-ruby-native-extension-java/ The "service" model of getting the code to load has largely (but unofficially) been deprecated in favor of simply using Java integration to boot up the extension directly, as seen in JRuby's OpenSSL ruby bits: ``` ruby # Attempt to load the gem first begin require 'jruby-openssl' rescue LoadError # Not available, use built-in require 'bouncy-castle-java' require 'jopenssl.jar' org.jruby.ext.openssl.OSSLLibrary.new.load(JRuby.runtime, false) ... ``` But otherwise, we _do_ have several good examples of how to write extensions. A few current extensions that would be good models: - The [weakling gem](https://github.com/headius/weakling) implements a more reliable weakref for (J)Ruby. - Extensions in the [thread_safe gem](https://github.com/headius/thread_safe) and the [atomic gem](https://github.com/headius/ruby-atomic) provide concurrency utilities. - The [psych gem](https://github.com/tenderlove/psych) will soon incorporate JRuby's extension alongside the C extension. It provides a very good model of how to write a minimal Java-based extension that you wire up and provide a nice API for in Ruby.

Further I have since updated yokolets fraction class
https://github.com/ruby-processing/Poplar
But like James C. before me, I feel I’m working a bit in the dark.