Project Avatar: Server Side JavaScript on the JVM Lyon JUG - March 2014

!David Delabassee @delabassee Software Evangelist - Oracle

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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 Oracles products remains at the sole discretion of Oracle.

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Agenda

Web Application Architecture Evolution JavaScript and Node on the JVM Project Avatar Advanced JavaScript Services Avatar Client Framework Summary

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Evolution of Web Application Architecture

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A Java EE Perspective

Http, REST

REST, SSE, WebSockets

Pre

sent

atio

n !

(Ser

vlet

/ JS

P,

JSF)

Con

nect

ivity

(Web

Soc

ket,

RE

ST,

SS

E)

Ent

erpr

ise

Con

nect

ivity

and

Bus

ines

s Lo

gic

Java EE / JVM

Single-page applications View/Controller in browser Model on server

View

Con

trolle

r

JavaScript

BrowserClientServer

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Java EE The Latest in Enterprise Java

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ENTERPRISE EDITIONDEVELOPER

PRODUCTIVITYMEETING ENTERPRISE DEMANDS

Java EE 7

Batch Concurrency Simplified JMS

More annotated POJOs Less boilerplate code Cohesive integrated

platform WebSockets JSON Servlet 3.1 NIO REST

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Node.js

Server-side JavaScript based on Chrome v8 engine Created by Ryan Dahl (2009), Open Source Designed for fast, scalable network applications Event-driven, non-blocking I/O model Melting pot community

JavaScript, Java, .NET, PHP, Very active, with 60,000+ modules

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Server Side JavaScript

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Node.js Programming Model

Multi-threading is hard Thousands of concurrent connections Deal with deadlocks and race conditions

Blocking I/O is bad

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Single threaded Event-loop

Callback model Non-blocking I/O calls Heavily parallelized

HTTP Callback Example:

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Node.js Event Loop

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Single-ThreadedEvent Loop

Resource-Intensive Operations

Network

File System

Network

Compute

Register

Callback

Complete

Operation

Client Requests

(Http)

Response

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REST/SSE/WebSockets

Java

Scr

ipt

View

Con

trolle

r

JavaScript

BrowserClientServer

Node

Evolution of Web Application Architecture

Project-based end-to-end JavaScript Rapid prototyping & API layer Leverage backend resources

Aggregate & transform content Return JSON to browser

Mobile-enabling existing services

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Evolution of Web Application ArchitectureMobile-enabling existing services

ClientServer

Ent

erpr

ise

Con

nect

ivity

and

Bus

ines

s Lo

gic

Java EE / JVM

Java

Scr

ipt

What if we could run Nodealongside Java EE inthe same JVM?

View

Con

trolle

r

JavaScript

Browser

REST / SSE/ WebSockets

Node

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JavaScript and Node on the JVM

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Project Nashorn

ECMAScript 5.1 compliant Bundled with JDK 8

Replaces Rhino Faster (2x 10x) More secure

Java JavaScript interoperability

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JavaScript on the JVM

http://download.java.net/jdk8/docs/technotes/guides/scripting/nashorn/index.html

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Avatar.js

Platform for server side JavaScript applications Requires Nashorn (JDK 8) 95% Node compatibility

Use popular packages (Express, async, commander, etc) Uses same portability libraries as Node.js Limitation: No Chrome v8 native APIs

Avatar.js Advantages Leverage JVM e.g. Java frameworks, libraries, tools

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

Avatar.js = Node + Java

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Leverage Java, including Threads

Java

JavaScript

java.lang.Thread

java.util.SortedSet

java.math.BigInteger

Node App

JVM Process

com.myorg.MyObj

require (async)

postE

vent(

) Node Programming Model

Code in JavaScript Single event loop / thread Require (import) Node modules

Invoke Java code Java types and libraries new java.lang.Thread(); new com.myorg.MyObj();

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Project Avatar:Advanced JavaScript ServicesLeveraging Java EE

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Project Avatar

Similar in spirit to Servlets, but focused on REST, WebSocket, Server Sent Event (SSE) endpoints

Use familiar Node.js event-driven programming model and modules Layers on Avatar.js Node-compatible runtime Adds integrated enterprise features

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A Server Side JavaScript Services Framework

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Project Avatar

Multi-threading, lightweight message passing, no mutable shared state

HTTP listener / load-balancer managed by framework Model Store Object Relational Mapping Messaging JMS on Java EE container

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Leveraging the JVM and Java EE

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Avatar Architecture

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Server sideServer Database

Data

Notification

JDK 8 / Nashorn

Avatar Runtime

Node Modules

Avatar Modules

Server Runtime (Java EE)

Application Services

= Java framework= JavaScript framework= Application code

Avatar.js

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Avatar Services

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Multi-core, state sharing, data storage

Java

JVM Process

JavaScriptServices Services ServicesServices

Database

Data

Notification

shared state

JSON JSON JSON JSON

HTTP Load Balancer

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Shared State

MessageBus Publish/subscribe message passing Shared State

Simple map API Application-scoped instance Session-scoped instance

Named Leased, with configurable timeout

Provide required serialization, concurrency, and caching

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Lightweight inter-thread communication

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Shared State Example

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var avatar = require(org/glassfish/avatar);! var threads = require(org/glassfish/avatar/threads);! var app = avatar.application;! var name = app.name;! var bus = app.bus;!! // Listen for messages on the alert topic! bus.on(alert, function(msg) {! print(name + got + msg); ! });!! // Start a background thread which publishes to the alert topic! // Background threads do not participate in request processing! threads.newBackgroundThread(background, monitor.js).start();!

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Push Service Example

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var avatar = require(org/