JRuby: Polyglot Heaven

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Charles Nutter

Tom and Charlie talk about using other JVM languages and their libraries from within JRuby, using only Ruby code.

Technology

The JRuby Advantage

All langs in JVM share same underlying VM

Common GC

cross-language communication

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The MethodHandle API provides a powerful way to build optimized function pointers that do a wide variety of call-path adaptations. Unfortunately, the API as designed requires mental contortions to write anything more than trivial handle chains by hand. Adaptations must be made backwards from the target, argument-list modifications are done by index and length, and debugging failed adaptations can be a terrific challenge. InvokeBinder seeks to make method handles fun and easy to use by providing a fluent API, building adaptations from the call forward, allowing argument-list manipulation by name and wildcard, and much more. We'll explore everything InvokeBinder does today and talk about improvements for the future.

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JRuby 9000 represents the biggest-ever leap forward for JRuby. Not only have we caught up on compatibility (9000 will be 2.2-compatible from release), but we've completely redesigned our JVM-based runtime and have opened our codebase up to the JRuby+Truffle research project from Oracle Labs. The changes we've made will make it easier to keep up with MRI on compatibility and give us the potential to run Ruby as fast as Java or C. The entire Ruby world will change over the next year, and JRuby 9000 will be leading the way. We'll talk about what Ruby's going to look like once JRuby is "over 9000".

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