Scalable JavaScript applications with Project Nashorn

SpeakersLeonardo ZanivanSoftware Architect, Trier Sistemasgithub.com/panga@leonardopanga

Michel GracianoSoftware Architect, Betha Sistemasgithub.com/mgraciano@mgraciano

Agenda● Why JS in the server● Why the JVM● Nashorn ecosystem● Vert.x and Avatar/Avatar.js● Q&A

Why JS in the server● Asynchronous by nature● Native JSON support● Language reuse● Easier developer transition

Why the JVM● Multilanguage● APM Tools● Access to the Java ecosystem

○ Domain models already implemented○ Java EE○ Core and third parties Java libraries

Nashorn● JDK 8 Compact 1 Profile with extension● Restrictions (browsers API, DOM)● No native CommonJS implementation● ECMA 5.1 + Rhino compatibility● jjs interactive command line tool

Nashorn● JDK 8u20

○ JDK-8032068: sourceURL directives○ JDK-8021350: Share script classes between

threads/globals● JDK 8u40

○ JEP 196: Nashorn Optimistic Typing○ JEP 202: Nashorn Class Filter○ JEP 203: Initial ES6 implementation (const & let)

● JEP 194: Nashorn Code Persistence (lazy compilation)

But how to scale it?

But how to scale it?Architectures and Technologies

Event-driven architecture● Event-loops● Async non-blocking IO● Reactive system● Event bus

Event-driven architecture

Microservice architecture● Focused on specific business● Well defined & distributed● Loosely coupled● Testable● Scalable

Microservices Architecture

Vert.x● http://vertx.io/● Based on Netty● Sponsored by Red Hat● Winner of JAX Innovation Awards 2014

@timfox: Writing Highly Concurrent Polyglot Applications with Vert.x [CON7902] Thursday, Oct 2, 11:30 AM

Vert.x● Key benefits

○ Polyglot○ Event bus (async & worker verticles)○ Create reactive applications○ Microservices ready○ Strong community involvement

Vert.x Architecture

Vert.x● Key benefits

○ Easy deployment■ CLI, API, mods, runtime deps resolution

○ Good build tools support (fat jar, auto-redeploy)○ Native Cluster & HA with Hazelcast○ Tons of extensions available

Vert.x● Challenges

○ Updated documentation○ Verticle monitoring○ Limited transactions support○ Doesn’t have distributed maps yet (2.x)○ Nashorn debugging support (PR to be merged)

Vert.x● Vert.x 3 highlights

○ JDK 8+ with Nashorn & Lambda○ No more module system*○ Clustered shared data○ Event bus proxies & codecs○ Ext stack (MongoDB, SockJS, Route, Rx)

Demo● Real-time notification service using

websockets over nashorn integrating with a legacy Java EE app

Avatar.js● https://avatar-js.java.net● Oracle sponsored● Focus on bringing the node programming

model, APIs and module ecosystem to the Java platform

Avatar.js

Avatar● https://avatar.java.net● Oracle sponsored● Focus on Thin Server Architecture

○ Supports REST, WebSocket and Server-Sent Events

● Built on Avatar.js

Avatar Architecture

Avatar EE Architecture

● Deploying an application on Glassfish 4○ asadmin deploy ~/projects/<app-folder-name>

● Running the application○ http://localhost:8080/<app-folder-name>

Avatar

Avatar/Avatar.js● Key benefits

○ Avatar Services use an Actor-like concurrency model

○ NPM modules support○ Strong Java EE integration○ Debugging

Avatar/Avatar.js● Challenges

○ Weak community involvement○ Low activity and no stable release○ Glassfish / Weblogic only○ Model Store API supports only Oracle NoSQL for

schemaless database

Benchmark● Some simple and naive scenarios

○ Posting and querying from database○ Returning a simple JSON response○ String concatenation○ Fibonacci calculation

Benchmark● Node.js 0.10.29 (2014-06-16)● Avatar.js 0.10.28-SNAPSHOT (2014-07-20)● Vert.X 2.1.1 (2014-06-18)● Avatar 1.0-ea-SNAPSHOT (2014-07-26)● JDK 8u5

Some Fib(30) results

Some Fib(30) results

Some Fib(30) results

Q&A

Credits● Event-loop & Vert.X architecture

○ Slideshare presentation http://bit.ly/1qz6KUb● Microservice architecture

○ http://martinfowler.com/articles/microservices.html● Avatar.js architecture

○ Project Avatar.js website● Avatar and Avatar EE architectures

○ Project Avatar website

Thank you!@leonardopanga@mgraciano

● Sources○ github.com/mgraciano/javaone-2014○ github.com/panga/javaone2014-benchmarks