RingoJS Philipp Naderer @botic 

History 1998 Helma 2008 HelmaNG 2010 RingoJS - monolithic - HopObject as root prototype - objects are mapped to db tables - advanced code repository loaders - modular approach - CommonJS modules - core modules provided - CommonJS modules - Ringo-specific modules - packages (reusable modules) - hot code reloading 

What is RingoJS? “Ringo is a JavaScript platform built on the JVM and optimized for server-side applications. It takes a non- dogmatic stance on things like I/O paradigms.” 

What is RingoJS? ● multi-threaded JavaScript ● CommonJS compatible ● ES5 + some ES6 ● code repository manager ● optimized to run scalable web application 

What Ringo is not … ● copying node / io.js ● compatible with npm ● the fastest async io framework ● used by thousands of devs ● JEE or similar enterprise stuff ● single-threaded 

What we know so far … ● Ringo has a history back to 1998 ● its running on the JVM ● uses multiple threads in parallel ● supports blocking and non-blocking I/O ● is not enterprise JavaScript 

So it’s time to get started! ● Install OpenJDK or Oracle’s JRE ● Download Ringo ○ ZIP / tarball: download and extract, add /bin to PATH ○ Homebrew: brew install ringojs ● Run ringo 

Demo … 

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Internals 

Ringo’s Java part is small and compact JavaScript 61.4% Java 38.3% Shell 0.3% 

JVM JRE Rhino JavaScript Engine RhinoEngine Class Module Loaders Workers Code Repositories Java parts of Ringo Ringo JsgiServlet 

JavaScript parts ● CommonJS modules ○ io, fs, binary, assert, gobals, system, net, … ● Ringo modules ○ daemon, engine, logging, promise, term, worker, httpserver, httpclient, … ● Ringo utility modules ○ strings, dates, objects, numbers, files, … 

Workers? 

Workers solve this “cute” problem: Multithreading Theory Practice 

Let’s say we have to build a house … 

Avoid concurrency at all … One single worker, but powerful and the worker never has to wait for resources. This is node & io.js 

… or assign every worker a special task Multiple workers, but no shared resources. This is Ringo’s approach! 

Web Apps? 

Create a simple web application ringo-admin create -h Creates a Ringo application or package. Usage: ringo-admin create [options] [path] Options: -a --app-source [DIR] Copy application from [DIR] instead of skeleton -g --google-appengine Create a new Google App Engine application -p --ringo-package Create a new Ringo package -s --symlink Create symbolic links for jar and module files -w --java-webapp Create a new Java Web application (WAR) 

Demo … 

Ringo’s web stack 

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Oh nice, but npm? 

rp package manager ● ringo-admin install grob/rp ● find & publish packages at packages.ringojs.org ● rp is the command line tool ○ download, install & publish packages ○ packages are downloaded into a packages directory ○ to get help: rp help [install | publish | ...] 

rp package manager ● rp install ● rp install -g ringo-sqlstore ● rp install ringo-sqlstore // loads the installed package var sqlst = require("ringo-sqlstore"); 

Popular packages ● stick – web application framework ● reinhardt – Django-like templating ● ringo-sqlstore – JavaScript-based ORM ● gestalt – easy configuration management 

but still … 

Haters gonna hate … 

“java guys doing something stupid” 

“ringojs created because the java guys believe java and want to integrate javascript with java on the server side.” True! We want to use the power of the JVM to run JavaScript on the server. 

Why JavaScript on the JVM? ● Interpreted language → hot code reloading! ● JVM is a very stable and fast technology ● A huge ecosystem exists (Java & JavaScript) ● Web developers know JavaScript ● Server admins know the JVM 

“Java guys believe in Java …” 

“Java guys believe in Java …” ● Enterprise-proven money representation? ○ Joda-Money instead of 0.1 + 0.2 = 0.30000000000000004 ● Timezones? Timezone updates? ○ Joda-Time or java.time (Java SE 8) ● An alternative if your company is JEE hell? ○ Ringo runs seamless in servlet containers 

“nodejs created because Ryan want a effective way to create net app no I/O blocking. He choose javascript because js has no old/outdated libs, which usually are the main problem of your I/O blocking.” 

JSON.parse is provided by V8 and synchronous! 

And till the end, we've found js is so beautiful and java IS SO UGLY. If you look at Ringo’s Java core, you find a lot of beautiful and amazing Java code. Hannes, the creator of Ringo, worked on it for years. 

Only stupid guy want to use java to rebuild js. JavaScript → language, JVM → abstract machine There are a lot of JVM-languages available: Java, Scala, JavaScript, Clojure, Groovy, … 

That’s it! Resources: ringobeta.hoffburg.at ringojs.org