https://github.com/jruby/jruby/jruby-core: JRuby is the effort to recreate the Ruby (https://www.ruby-lang.org) interpreter in Java. (JRuby)
  • headius
  • enebo
  • wmeissner
  • BanzaiMan
  • mkristian 

package org.jruby.ext.ffi;

import org.jruby.Ruby;

public abstract class CallbackManager {
    public abstract Pointer getCallback(Ruby runtime, CallbackInfo cbInfo, Object proc);
}