hands-on-graalvm.md

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Hands on

[fit] GraalVM

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GraalVM in a Nutshell

• Polyglot Runtime: JVM Languages, R, JavaScript, NodeJS, Ruby, Python, C/C++ via LLVM
• Ahead-of-time Compilation
  • Memory management, thread scheduling via SubstrateVM
• GraalVM as a Platform
  • Embed and extend GraalVM with Truffle
  • Implement your own language and tools

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[fit] Demos

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Build CLIs with Picocli and GraalVM

• Picocli is a framework to easily build JVM command line apps.
• Support for ANSI colors, completion, sub commands, annotations and programmatic API.
• Good support for GraalVM AOT Compilation to Native Images via the ReflectionConfigGenerator utility.
• Native utilities and sidecar containers can now also be build using Java! Golang is still cool.

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Polyglot Mayhem

• The Graal Polyglot API allows you to embed and use different languages with full bidirectional interop.

private static void helloR(PolyglotMessage message) {
    try (Context context = Context.newBuilder().allowAllAccess(true).build()) {
        context.getPolyglotBindings().putMember("message", message);
        context.eval("R",
                "message <- import('message');" +
                "message$invocations <- message$invocations + 1;" +
                "print(message$text);");
    }
}

• This is not the same as with the Java Scripting API (defined by JSR 223)!