This repository contains the code for a demo application for GraalVM.
Download or clone the repository and navigate into the polyglot-javascript-java-r directory:
git clone https://github.com/shelajev/graalvm-demos
cd graalvm-demos/polyglot-javascript-java-r
Build the benchmark. You can manually execute npm install, but there's also a build.sh script included for your convenience.
Execute:
./build.sh
Now you're all set to run the polyglot JavaScript, Java, R application.
Export the GraalVM home directory as the $GRAALVM_HOME and add $GRAALVM_HOME/bin to the path. Here's what I have in my ~/.bashrc on my MacBook, note that your paths are likely to be different depending on the download location.
GRAALVM_VERSION=1.0.0-rc11
export GRAALVM_HOME=/Users/${current_user}/repo/graal-releases/graalvm-$GRAALVM_VERSION/Contents/Home
To run the application, you need to execute the server.js file. You can run it with the following command (or run the run.sh script):
$GRAALVM_HOME/bin/node --jvm --polyglot server.js
If you'd like to run the benchmark on a different instance of Node, you can run it with whatever node you have. However, usually the polyglot capability won't be supported and the app won't run successfully.
Open localhost:3000 and enjoy the output of the polyglot app. Play with the source code and restart the application to see what else can you do with the mix of JavaScript, Java, and R.
GraalVM supports debugging polyglot applications too, add the --inspect parameter to the command line, open the url the application prints at the startup in Chrome browser and you can debug, set breakpoints, evaluate expressions in this app in the JavaScript and R code alike.
This is a sample application that for brevity contains large-ish snippets of code inside the strings. This is not the best approach for structuring polyglot apps, but it's the easiest to show in a single file.