JavaOne 2014 - Scalable JavaScript Applications with Project Nashorn [CON6423]

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

o Domain models already implementedo Java EEo 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

o JDK-8032068: sourceURL directiveso JDK-8021350: Share script classes between

threads/globals● JDK 8u40

o JEP 196: Nashorn Optimistic Typingo JEP 202: Nashorn Class Filtero 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

o Polygloto Event bus (async & worker verticles)o Create reactive applicationso Microservices readyo Strong community involvement

Vert.x Architecture

Vert.x● Key benefits

o Easy deployment CLI, API, mods, runtime deps resolution

o Good build tools support (fat jar, auto-redeploy)

o Native Cluster & HA with Hazelcasto Tons of extensions available

Vert.x● Challenges

o Updated documentationo Verticle monitoringo Limited transactions supporto Doesn’t have distributed maps yet (2.x)o Nashorn debugging support (PR to be

merged)

Vert.x● Vert.x 3 highlights

o JDK 8+ with Nashorn & Lambdao No more module system*o Clustered shared datao Event bus proxies & codecso 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

o Supports REST, WebSocket and Server-Sent Events

● Built on Avatar.js

Avatar Architecture

Avatar EE Architecture

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

name>● Running the application

o http://localhost:8080/<app-folder-name>

Avatar

Avatar/Avatar.js● Key benefits

o Avatar Services use an Actor-like concurrency model

o NPM modules supporto Strong Java EE integrationo Debugging

Avatar/Avatar.js● Challenges

o Weak community involvemento Low activity and no stable releaseo Glassfish / Weblogic onlyo Model Store API supports only Oracle NoSQL

for schemaless database

Benchmark● Some simple and naive scenarios

o Posting and querying from databaseo Returning a simple JSON responseo String concatenationo 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

o Slideshare presentation http://bit.ly/1qz6KUb

● Microservice architectureo http://martinfowler.com/articles/microservices.html

● Avatar.js architectureo Project Avatar.js website

● Avatar and Avatar EE architectureso Project Avatar website

Thank you!@leonardopanga@mgraciano

● Sourceso github.com/mgraciano/javaone-2014o github.com/panga/javaone2014-benchmarks