Server Side JavaScript on the Java Platform - David Delabassee

Copyright © 2014, Oracle and/or its affiliates. All rights reserved.

Project AvatarServer-‐side JavaScript on the JVM !JAX London -‐ Oct. 2014

David Delabassee (@delabassee) Oracle


Safe Harbor Statement

The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle’s products remains at the sole discretion of Oracle.

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Agenda

Setting the Context

Avatar – Enterprise Node on the JVM

Demo

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Agenda

Setting the Context


Demo

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Node.js

• Server-‐side JavaScript based on Chrome v8 engine • Created in 2009, Open Source • Designed for scalable Internet applications • Melting pot community – Java, .NET, Browser, PHP, etc, experience

• Node Packaged Modules – Very active, with +98,000 modules (YMMV)

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Server Side JavaScript


Node.js Programming Model• Multi-‐threading is hard – Thousands of concurrent connections – Deal with deadlocks and race conditions

• Blocking on I/O is bad • Event Loop – Reactive Model – Non-‐blocking I/O calls

• Application code executes in a single thread

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Event LoopClients

Non-‐blocking Worker


Node.js Programming Model

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var http = require("http");!!http.createServer( … ).listen(80);


Node.js Programming Model

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var http = require("http");!!http.createServer(function(request, response) {!! response.writeHead(200, {"Content-type": "text/plain"});!! response.write("Hello World";)!! response.end();!}).listen(80);


Nashorn!• Bundled with Java 7 and 8 • ECMAScript 5.1 compatibility • Performance (vs Rhino) • Java Interoperability

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JavaScript Engine


Nashorn Quick Demo

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Scaling Server-‐Side JavaScript

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What If I’m in a Java Shop?

• Java Developer Investments – In-‐house Java-‐based frameworks – 3rd party commercial and/or open source libraries – Lots of experience with Java development

• Investment in Java infrastructure – Java EE application servers – JMX-‐based monitoring and management – Established data center processes and best practices – “We are a Java company”, or “We already do Java and .NET”

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Project Avatar

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Bridging the gap

AvatarNode on the JVM!

Thousands of Node libraries !Thousands of Java libraries

Java EE Interoperability!Leverage Existing Infrastructure!

Build Enterprise Applications in JavaScript!


Agenda

Setting the context


Demo

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Avatar 2.0• 95% Node compatibility provided by Avatar.js • Uses same C portability libraries as Node.js – libuv, http-‐parser

• No Chrome v8 native APIs! • Run popular packages – Express, async, commander, etc.

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Avatar 2.0• Enterprise Features – Advanced multithreading – State sharing – Avatar Persistence – Java EE Interoperability (EJB, JMS)

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Avatar 2.0 -‐ What’s new• Runs standalone –Out of the box, no application server required

• Run from command line • Use your favorite Node framework(s) • Use your favorite client framework

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Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 18

Avatar 2.0 Architecture

REST/WS/SSE

JVM

EclipseLink, NoSQL

Core Node Modules

Nashorn & JRE 8

Application JavaScript Modules & Java Jars

Mission Control

DatabaseData

WebLogicEJB/JMS

Admin AgentMgmt Plugin

libuv + JNI bindings

Java codeJavaScript codeApplication JavaScript & Java

Platform specific native code

WLS T3 thin client

Flight Recorder Probes

MBeans

Avatar

Avatar API Modules

Bundled Third-Party JavaScript Modules

Avatar Process

Optional Processes

Coherence CoherenceState


Nashorn!• Bundled with Java 7 and 8 • ECMAScript 5.1 compatibility • Performance (vs Rhino) • Java Interoperability

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JavaScript Engine


Nashorn -‐ Using Java 8 within a Node appvar http = require("http");!var list = new java.util.ArrayList();!!list.add("Blue"); list.add(“Green"); list.add("Yellow");!list.add("Red"); list.add("Dark Red"); list.add("Light Red”);!!http.createServer(function(request, response) {! response.writeHead(200, {"Content-Type": "application/json"});!! var count = list.parallelStream()! .filter(function(t) { return t.match('Red') } )! .count();!! response.end(“{'reds': count}”);!}).listen(8080);


Avatar Multithreading

• Multiple instances of an application in single JVM process – Each instance has its own event loop thread and JavaScript context – Shared sockets – every instance listens on the same port –Optional coordination via JavaScript state sharing APIs –Messaging API –Map API

• Can dynamically create background threads as well

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Taking advantage of the multithreaded JVM


Avatar Application Scaling

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A picture is worth a thousand threads


var threads = require('avatar/threads');!!var createBallThread = function(ballInfo) {!! var deferred = when.defer();!! var eventThread = threads.newEventThread("BouncingBallThread", !! ! __dirname + "/ball.js", [!! ! ! "color=" + ballInfo.color,!! ! ! "gravity=" + ballInfo.gravity,!! ! ! "rowid=" + ballInfo.id_!! ! ]);!!! eventThread.start(function (event, error) {!! ! switch(event) {!! ! ! case "started":!! ! ! ! console.log("Thread ", eventThread.thread.index(), "Started");!! ! ! ! ballInfo.id = eventThread.thread.index();!…

Creating New Event Threads


Avatar Shared State Framework

• Message Bus – Publish / subscribe message passing

• Shared State – Simple map API – Application-‐scoped instance – Session-‐scoped instance • Named • Leased, with configurable timeout

• Avatar provides required serialization, concurrency control, and caching

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Lightweight inter-‐thread communication


bus.on("kill", function (id) {! if (_interval && _id && (_id.toString() === id.toString())) {! clearInterval(_interval);! process.exit();! }!});!!bus.subscribe("argsUpdate", function (data) {! if (data.id === app.threadIndex) {! gravity = data.gravity;! }!});

Message Bus (Subscribe)


_interval = setInterval(function () {! var msg = {! id: _id, ! color: app.args.color,! heartbeat: heartbeat++, ! …! };!! msg.message = "Thread " + app.threadIndex + " | Heartbeat: " +! heartbeat + " | Gravity: " + gravity;!! bus.publish("messages", msg);!!}, 2000);

Message Bus (Publish)


• Supports Relational & NoSQL databases • Similar to Sequelize, JugglingDB, etc • Leverages EclipseLink JPA Provider • Leverages mature, feature rich Java ecosystem – Tooling to generate JavaScript model for existing database schema – 2nd level JPA cache (TopLink Grid) –Oracle RAC connection pooling, etc.

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Avatar Persistence FrameworkJavaScript API


Avatar Persistence (Model)var avatar = require("avatar");!var model = require("avatar/model");!!var store = model.newStore(config.db.name, {! database: config.db.database,! username: config.db.username,! properties: { "eclipselink.logging.level": “INFO” }!});!!var BallModel = model.newModel("Ball", {! "color": "string",! "gravity": "number"!});!!store.bind(BallModel);


Avatar Persistencereturn {!! getThreads: function() {!! ! return BallModel.getAll();!! },!! !

! createThread: function(thread) {!! ! return BallModel.create(aBall);!! },!! !

! deleteThread: function(id) {!! ! return BallModel.delete(id);!! },!! !

! updateThread: function(data) {!! ! var deferred = when.defer();!! ! BallModel.get(data.id_).then(function(row) {!! ! row.gravity = parseInt(data.gravity);!! ! BallModel.put(row).then(function(updatedRow) {


Additional Features and Potential• Expand Java Mission Control / Flight Recorder support • Remote EJB and JMS support – Using WebLogic t3 thin client

• Automatically reload application on file change (development feature) • Work in progress – Coherence (JCache) integration for cross-‐JVM state sharing –Manage using WebLogic and/or Oracle Enterprise Manager

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Agenda

Setting the context


Demo

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Browser main.js ball.js . . . ball.js ball.js ball.js

newEventThread(‘ball.js’)

REST

WebSocket

Avatar Process

heartbeat gravity heartbeat heartbeat Message Bus

express.js ws.js avatar.js

model.js

Database

Demo


Next• Check Avatar - http://avatar.java.net

• We plan to open source Avatar 2.0 soon • We need your feedback! !• Thank You!

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Server Side JavaScript on the Java Platform - David Delabassee

Presentations & Public Speaking

Transcript of Server Side JavaScript on the Java Platform - David Delabassee